CMake/Source/cmTarget.cxx

/*=========================================================================

  Program:   CMake - Cross-Platform Makefile Generator
  Module:    $RCSfile$
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#include "cmTarget.h"
#include "cmake.h"
#include "cmMakefile.h"
#include "cmSourceFile.h"
#include "cmLocalGenerator.h"
#include "cmGlobalGenerator.h"
#include "cmComputeLinkInformation.h"
#include <map>
#include <set>
#include <queue>
#include <stdlib.h> // required for atof
#include <assert.h>
const char* cmTarget::TargetTypeNames[] = {
  "EXECUTABLE", "STATIC_LIBRARY",
  "SHARED_LIBRARY", "MODULE_LIBRARY", "UTILITY", "GLOBAL_TARGET",
  "INSTALL_FILES", "INSTALL_PROGRAMS", "INSTALL_DIRECTORY"
};

//----------------------------------------------------------------------------
cmTarget::cmTarget()
{
  this->Makefile = 0;
  this->LinkLibrariesAnalyzed = false;
  this->HaveInstallRule = false;
  this->DLLPlatform = false;
  this->IsImportedTarget = false;
}

//----------------------------------------------------------------------------
void cmTarget::DefineProperties(cmake *cm)
{
  cm->DefineProperty
    ("BUILD_WITH_INSTALL_RPATH", cmProperty::TARGET,
     "Should build tree targets have install tree rpaths.",
     "BUILD_WITH_INSTALL_RPATH is a boolean specifying whether to link "
     "the target in the build tree with the INSTALL_RPATH.  This takes "
     "precedence over SKIP_BUILD_RPATH and avoids the need for relinking "
     "before installation.");

  cm->DefineProperty
    ("CLEAN_DIRECT_OUTPUT", cmProperty::TARGET,
     "Do not delete other variants of this target.",
     "When a library is built CMake by default generates code to remove "
     "any existing library using all possible names.  This is needed "
     "to support libraries that switch between STATIC and SHARED by "
     "a user option.  However when using OUTPUT_NAME to build a static "
     "and shared library of the same name using different logical target "
     "names the two targets will remove each other's files.  This can be "
     "prevented by setting the CLEAN_DIRECT_OUTPUT property to 1.");

  cm->DefineProperty
    ("COMPILE_FLAGS", cmProperty::TARGET,
     "Additional flags to use when compiling this target's sources.",
     "The COMPILE_FLAGS property sets additional compiler flags used "
     "to build sources within the target.  Use COMPILE_DEFINITIONS "
     "to pass additional preprocessor definitions.");

  cm->DefineProperty
    ("COMPILE_DEFINITIONS", cmProperty::TARGET,
     "Preprocessor definitions for compiling a target's sources.",
     "The COMPILE_DEFINITIONS property may be set to a list of preprocessor "
     "definitions using the syntax VAR or VAR=value.  Function-style "
     "definitions are not supported.  CMake will automatically escape "
     "the value correctly for the native build system (note that CMake "
     "language syntax may require escapes to specify some values).  "
     "This property may be set on a per-configuration basis using the name "
     "COMPILE_DEFINITIONS_<CONFIG> where <CONFIG> is an upper-case name "
     "(ex. \"COMPILE_DEFINITIONS_DEBUG\").\n"
     "CMake will automatically drop some definitions that "
     "are not supported by the native build tool.  "
     "The VS6 IDE does not support definitions with values "
     "(but NMake does).\n"
     "Dislaimer: Most native build tools have poor support for escaping "
     "certain values.  CMake has work-arounds for many cases but some "
     "values may just not be possible to pass correctly.  If a value "
     "does not seem to be escaped correctly, do not attempt to "
     "work-around the problem by adding escape sequences to the value.  "
     "Your work-around may break in a future version of CMake that "
     "has improved escape support.  Instead consider defining the macro "
     "in a (configured) header file.  Then report the limitation.");

  cm->DefineProperty
    ("COMPILE_DEFINITIONS_<CONFIG>", cmProperty::TARGET,
     "Per-configuration preprocessor definitions on a target.",
     "This is the configuration-specific version of COMPILE_DEFINITIONS.");

  cm->DefineProperty
    ("DEFINE_SYMBOL", cmProperty::TARGET,
     "Define a symbol when compiling this target's sources.",
     "DEFINE_SYMBOL sets the name of the preprocessor symbol defined when "
     "compiling sources in a shared library. "
     "If not set here then it is set to target_EXPORTS by default "
     "(with some substitutions if the target is not a valid C "
     "identifier). This is useful for headers to know whether they are "
     "being included from inside their library our outside to properly "
     "setup dllexport/dllimport decorations. ");

  cm->DefineProperty
    ("DEBUG_POSTFIX", cmProperty::TARGET,
     "A postfix that will be applied to this target when build debug.",
     "A property on a target that specifies a postfix to add to the "
     "target name when built in debug mode. For example foo.dll "
     "versus fooD.dll");

  cm->DefineProperty
    ("EchoString", cmProperty::TARGET,
     "A message to be displayed when the target is built.",
     "A message to display on some generators (such as makefiles) when "
     "the target is built.");

  cm->DefineProperty
    ("FRAMEWORK", cmProperty::TARGET,
     "This target is a framework on the Mac.",
     "If a shared library target has this property set to true it will "
     "be built as a framework when built on the mac. It will have the "
     "directory structure required for a framework and will be suitable "
     "to be used with the -framework option");

  cm->DefineProperty
    ("HAS_CXX", cmProperty::TARGET,
     "Force a target to use the CXX linker.",
     "Setting HAS_CXX on a target will force the target to use the "
     "C++ linker (and C++ runtime libraries) for linking even if the "
     "target has no C++ code in it.");

  cm->DefineProperty
    ("IMPORT_PREFIX", cmProperty::TARGET,
     "What comes before the import library name.",
     "Similar to the target property PREFIX, but used for import libraries "
     "(typically corresponding to a DLL) instead of regular libraries. "
     "A target property that can be set to override the prefix "
     "(such as \"lib\") on an import library name.");

  cm->DefineProperty
    ("IMPORT_SUFFIX", cmProperty::TARGET,
     "What comes after the import library name.",
     "Similar to the target property SUFFIX, but used for import libraries "
     "(typically corresponding to a DLL) instead of regular libraries. "
     "A target property that can be set to override the suffix "
     "(such as \".lib\") on an import library name.");

  cm->DefineProperty
    ("IMPORTED", cmProperty::TARGET,
     "Read-only indication of whether a target is IMPORTED.",
     "The boolean value of this property is true for targets created with "
     "the IMPORTED option to add_executable or add_library.  "
     "It is false for targets built within the project.");

  cm->DefineProperty
    ("IMPORTED_CONFIGURATIONS", cmProperty::TARGET,
     "Configurations provided for an IMPORTED target.",
     "Lists configuration names available for an IMPORTED target.  "
     "The names correspond to configurations defined in the project from "
     "which the target is imported.  "
     "If the importing project uses a different set of configurations "
     "the names may be mapped using the MAP_IMPORTED_CONFIG_<CONFIG> "
     "property.  "
     "Ignored for non-imported targets.");

  cm->DefineProperty
    ("IMPORTED_IMPLIB", cmProperty::TARGET,
     "Full path to the import library for an IMPORTED target.",
     "Specifies the location of the \".lib\" part of a windows DLL.  "
     "Ignored for non-imported targets.");

  cm->DefineProperty
    ("IMPORTED_IMPLIB_<CONFIG>", cmProperty::TARGET,
     "Per-configuration version of IMPORTED_IMPLIB property.",
     "This property is used when loading settings for the <CONFIG> "
     "configuration of an imported target.  "
     "Configuration names correspond to those provided by the project "
     "from which the target is imported.");

  cm->DefineProperty
    ("IMPORTED_LINK_DEPENDENT_LIBRARIES", cmProperty::TARGET,
     "Dependent shared libraries of an imported shared library.",
     "Shared libraries may be linked to other shared libraries as part "
     "of their implementation.  On some platforms the linker searches "
     "for the dependent libraries of shared libraries they are including "
     "in the link.  This property lists "
     "the dependent shared libraries of an imported library.  The list "
     "should be disjoint from the list of interface libraries in the "
     "IMPORTED_LINK_INTERFACE_LIBRARIES property.  On platforms requiring "
     "dependent shared libraries to be found at link time CMake uses this "
     "list to add appropriate files or paths to the link command line.  "
     "Ignored for non-imported targets.");

  cm->DefineProperty
    ("IMPORTED_LINK_DEPENDENT_LIBRARIES_<CONFIG>", cmProperty::TARGET,
     "Per-configuration version of IMPORTED_LINK_DEPENDENT_LIBRARIES.",
     "This property is used when loading settings for the <CONFIG> "
     "configuration of an imported target.  "
     "Configuration names correspond to those provided by the project "
     "from which the target is imported.");

  cm->DefineProperty
    ("IMPORTED_LINK_INTERFACE_LIBRARIES", cmProperty::TARGET,
     "Transitive link interface of an IMPORTED target.",
     "Lists libraries whose interface is included when an IMPORTED library "
     "target is linked to another target.  "
     "The libraries will be included on the link line for the target.  "
     "Ignored for non-imported targets.");

  cm->DefineProperty
    ("IMPORTED_LINK_INTERFACE_LIBRARIES_<CONFIG>", cmProperty::TARGET,
     "Per-configuration version of IMPORTED_LINK_INTERFACE_LIBRARIES.",
     "This property is used when loading settings for the <CONFIG> "
     "configuration of an imported target.  "
     "Configuration names correspond to those provided by the project "
     "from which the target is imported.");

  cm->DefineProperty
    ("IMPORTED_LOCATION", cmProperty::TARGET,
     "Full path to the main file on disk for an IMPORTED target.",
     "Specifies the location of an IMPORTED target file on disk.  "
     "For executables this is the location of the executable file.  "
     "For bundles on OS X this is the location of the executable file "
     "inside Contents/MacOS under the application bundle folder.  "
     "For static libraries and modules this is the location of the "
     "library or module.  "
     "For shared libraries on non-DLL platforms this is the location of "
     "the shared library.  "
     "For frameworks on OS X this is the location of the library file "
     "symlink just inside the framework folder.  "
     "For DLLs this is the location of the \".dll\" part of the library.  "
     "Ignored for non-imported targets.");

  cm->DefineProperty
    ("IMPORTED_LOCATION_<CONFIG>", cmProperty::TARGET,
     "Per-configuration version of IMPORTED_LOCATION property.",
     "This property is used when loading settings for the <CONFIG> "
     "configuration of an imported target.  "
     "Configuration names correspond to those provided by the project "
     "from which the target is imported.");

  cm->DefineProperty
    ("IMPORTED_SONAME", cmProperty::TARGET,
     "The \"soname\" of an IMPORTED target of shared library type.",
     "Specifies the \"soname\" embedded in an imported shared library.  "
     "This is meaningful only on platforms supporting the feature.  "
     "Ignored for non-imported targets.");

  cm->DefineProperty
    ("IMPORTED_SONAME_<CONFIG>", cmProperty::TARGET,
     "Per-configuration version of IMPORTED_SONAME property.",
     "This property is used when loading settings for the <CONFIG> "
     "configuration of an imported target.  "
     "Configuration names correspond to those provided by the project "
     "from which the target is imported.");

  cm->DefineProperty
    ("EXCLUDE_FROM_ALL", cmProperty::TARGET,
     "Exclude the target from the all target.",
     "A property on a target that indicates if the target is excluded "
     "from the default build target. If it is not, then with a Makefile "
     "for example typing make will cause this target to be built. "
     "The same concept applies to the default build of other generators. "
     "Installing a target with EXCLUDE_FROM_ALL set to true has "
     "undefined behavior.");

  cm->DefineProperty
    ("INSTALL_NAME_DIR", cmProperty::TARGET,
     "Mac OSX directory name for installed targets.",
     "INSTALL_NAME_DIR is a string specifying the "
     "directory portion of the \"install_name\" field of shared libraries "
     "on Mac OSX to use in the installed targets. ");

  cm->DefineProperty
    ("INSTALL_RPATH", cmProperty::TARGET,
     "The rpath to use for installed targets.",
     "A semicolon-separated list specifying the rpath "
     "to use in installed targets (for platforms that support it).");

  cm->DefineProperty
    ("INSTALL_RPATH_USE_LINK_PATH", cmProperty::TARGET,
     "Add paths to linker search and installed rpath.",
     "INSTALL_RPATH_USE_LINK_PATH is a boolean that if set to true will "
     "append directories in the linker search path and outside the "
     "project to the INSTALL_RPATH. ");

  cm->DefineProperty
    ("LINK_FLAGS", cmProperty::TARGET,
     "Additional flags to use when linking this target.",
     "The LINK_FLAGS property can be used to add extra flags to the "
     "link step of a target. LINK_FLAGS_<CONFIG> will add to the "
     "configuration <CONFIG>, "
     "for example, DEBUG, RELEASE, MINSIZEREL, RELWITHDEBINFO. ");

  cm->DefineProperty
    ("LINK_FLAGS_<CONFIG>", cmProperty::TARGET,
     "Per-configuration linker flags for a target.",
     "This is the configuration-specific version of LINK_FLAGS.");

  cm->DefineProperty
    ("LINK_SEARCH_END_STATIC", cmProperty::TARGET,
     "End a link line such that static system libraries are used.",
     "Some linkers support switches such as -Bstatic and -Bdynamic "
     "to determine whether to use static or shared libraries for -lXXX "
     "options.  CMake uses these options to set the link type for "
     "libraries whose full paths are not known or (in some cases) are in "
     "implicit link directories for the platform.  By default the "
     "linker search type is left at -Bdynamic by the end of the library "
     "list.  This property switches the final linker search type to "
     "-Bstatic.");

  cm->DefineProperty
    ("LINKER_LANGUAGE", cmProperty::TARGET,
     "What tool to use for linking, based on language.",
     "The LINKER_LANGUAGE property is used to change the tool "
     "used to link an executable or shared library. The default is "
     "set the language to match the files in the library. CXX and C "
     "are common values for this property.");

  cm->DefineProperty
    ("LOCATION", cmProperty::TARGET,
     "Deprecated.  Use LOCATION_<CONFIG> or avoid altogether.",
     "This property is provided for compatibility with CMake 2.4 and below. "
     "It was meant to get the location of an executable target's output file "
     "for use in add_custom_command.  "
     "In CMake 2.6 and above add_custom_command automatically recognizes a "
     "target name in its COMMAND and DEPENDS options and computes the "
     "target location.  Therefore this property need not be used.  "
     "This property is not defined for IMPORTED targets because they "
     "were not available in CMake 2.4 or below anyway.");

  cm->DefineProperty
    ("LOCATION_<CONFIG>", cmProperty::TARGET,
     "Read-only property providing a target location on disk.",
     "A read-only property that indicates where a target's main file is "
     "located on disk for the configuration <CONFIG>.  "
     "The property is defined only for library and executable targets.");

  cm->DefineProperty
    ("LINK_INTERFACE_LIBRARIES", cmProperty::TARGET,
     "List public interface libraries for a shared library or executable.",
     "By default linking to a shared library target transitively "
     "links to targets with which the library itself was linked.  "
     "For an executable with exports (see the ENABLE_EXPORTS property) "
     "no default transitive link dependencies are used.  "
     "This property replaces the default transitive link dependencies with "
     "an explict list.  "
     "When the target is linked into another target the libraries "
     "listed (and recursively their link interface libraries) will be "
     "provided to the other target also.  "
     "If the list is empty then no transitive link dependencies will be "
     "incorporated when this target is linked into another target even if "
     "the default set is non-empty.");

  cm->DefineProperty
    ("LINK_INTERFACE_LIBRARIES_<CONFIG>", cmProperty::TARGET,
     "Per-configuration list of public interface libraries for a target.",
     "This is the configuration-specific version of "
     "LINK_INTERFACE_LIBRARIES.");

  cm->DefineProperty
    ("MAP_IMPORTED_CONFIG_<CONFIG>", cmProperty::TARGET,
     "Map from project configuration to IMPORTED target's configuration.",
     "List configurations of an imported target that may be used for "
     "the current project's <CONFIG> configuration.  "
     "Targets imported from another project may not provide the same set "
     "of configuration names available in the current project.  "
     "Setting this property tells CMake what imported configurations are "
     "suitable for use when building the <CONFIG> configuration.  "
     "The first configuration in the list found to be provided by the "
     "imported target is selected.  If no matching configurations are "
     "available the imported target is considered to be not found.  "
     "This property is ignored for non-imported targets.",
     false /* TODO: make this chained */ );

  cm->DefineProperty
    ("OUTPUT_NAME", cmProperty::TARGET,
     "Sets the real name of a target when it is built.",
     "Sets the real name of a target when it is built and "
     "can be used to help create two targets of the same name even though "
     "CMake requires unique logical target names.  There is also a "
     "<CONFIG>_OUTPUT_NAME that can set the output name on a "
     "per-configuration basis.");

  cm->DefineProperty
    ("PRE_INSTALL_SCRIPT", cmProperty::TARGET,
     "Deprecated install support.",
     "The PRE_INSTALL_SCRIPT and POST_INSTALL_SCRIPT properties are the "
     "old way to specify CMake scripts to run before and after "
     "installing a target.  They are used only when the old "
     "INSTALL_TARGETS command is used to install the target.  Use the "
     "INSTALL command instead.");

  cm->DefineProperty
    ("PREFIX", cmProperty::TARGET,
     "What comes before the library name.",
     "A target property that can be set to override the prefix "
     "(such as \"lib\") on a library name.");

  cm->DefineProperty
    ("POST_INSTALL_SCRIPT", cmProperty::TARGET,
     "Deprecated install support.",
     "The PRE_INSTALL_SCRIPT and POST_INSTALL_SCRIPT properties are the "
     "old way to specify CMake scripts to run before and after "
     "installing a target.  They are used only when the old "
     "INSTALL_TARGETS command is used to install the target.  Use the "
     "INSTALL command instead.");

  cm->DefineProperty
    ("PRIVATE_HEADER", cmProperty::TARGET,
     "Specify private header files in a FRAMEWORK shared library target.",
     "Shared library targets marked with the FRAMEWORK property generate "
     "frameworks on OS X and normal shared libraries on other platforms.  "
     "This property may be set to a list of header files to be placed "
     "in the PrivateHeaders directory inside the framework folder.  "
     "On non-Apple platforms these headers may be installed using the "
     "PRIVATE_HEADER option to the install(TARGETS) command.");

  cm->DefineProperty
    ("PUBLIC_HEADER", cmProperty::TARGET,
     "Specify public header files in a FRAMEWORK shared library target.",
     "Shared library targets marked with the FRAMEWORK property generate "
     "frameworks on OS X and normal shared libraries on other platforms.  "
     "This property may be set to a list of header files to be placed "
     "in the Headers directory inside the framework folder.  "
     "On non-Apple platforms these headers may be installed using the "
     "PUBLIC_HEADER option to the install(TARGETS) command.");

  cm->DefineProperty
    ("RESOURCE", cmProperty::TARGET,
     "Specify resource files in a FRAMEWORK shared library target.",
     "Shared library targets marked with the FRAMEWORK property generate "
     "frameworks on OS X and normal shared libraries on other platforms.  "
     "This property may be set to a list of files to be placed "
     "in the Resources directory inside the framework folder.  "
     "On non-Apple platforms these files may be installed using the "
     "RESOURCE option to the install(TARGETS) command.");

  cm->DefineProperty
    ("SKIP_BUILD_RPATH", cmProperty::TARGET,
     "Should rpaths be used for the build tree.",
     "SKIP_BUILD_RPATH is a boolean specifying whether to skip automatic "
     "generation of an rpath allowing the target to run from the "
     "build tree. ");

  cm->DefineProperty
    ("SOVERSION", cmProperty::TARGET,
     "What version number is this target.",
     "For shared libraries VERSION and SOVERSION can be used to specify "
     "the build version and api version respectively. When building or "
     "installing appropriate symlinks are created if the platform "
     "supports symlinks and the linker supports so-names. "
     "If only one of both is specified the missing is assumed to have "
     "the same version number. "
     "For shared libraries and executables on Windows the VERSION "
     "attribute is parsed to extract a \"major.minor\" version number. "
     "These numbers are used as the image version of the binary. ");

  cm->DefineProperty
    ("STATIC_LIBRARY_FLAGS", cmProperty::TARGET,
     "Extra flags to use when linking static libraries.",
     "Extra flags to use when linking a static library.");

  cm->DefineProperty
    ("SUFFIX", cmProperty::TARGET,
     "What comes after the library name.",
     "A target property that can be set to override the suffix "
     "(such as \".so\") on a library name.");

  cm->DefineProperty
    ("VERSION", cmProperty::TARGET,
     "What version number is this target.",
     "For shared libraries VERSION and SOVERSION can be used to specify "
     "the build version and api version respectively. When building or "
     "installing appropriate symlinks are created if the platform "
     "supports symlinks and the linker supports so-names. "
     "If only one of both is specified the missing is assumed to have "
     "the same version number. "
     "For executables VERSION can be used to specify the build version. "
     "When building or installing appropriate symlinks are created if "
     "the platform supports symlinks. "
     "For shared libraries and executables on Windows the VERSION "
     "attribute is parsed to extract a \"major.minor\" version number. "
     "These numbers are used as the image version of the binary. ");


  cm->DefineProperty
    ("WIN32_EXECUTABLE", cmProperty::TARGET,
     "Build an executable with a WinMain entry point on windows.",
     "When this property is set to true the executable when linked "
     "on Windows will be created with a WinMain() entry point instead "
     "of of just main()."
     "This makes it a GUI executable instead of a console application.  "
     "See the CMAKE_MFC_FLAG variable documentation to configure use "
     "of MFC for WinMain executables.");

  cm->DefineProperty
    ("MACOSX_BUNDLE", cmProperty::TARGET,
     "Build an executable as an application bundle on Mac OS X.",
     "When this property is set to true the executable when built "
     "on Mac OS X will be created as an application bundle.  "
     "This makes it a GUI executable that can be launched from "
     "the Finder.");

  cm->DefineProperty
    ("ENABLE_EXPORTS", cmProperty::TARGET,
     "Specify whether an executable exports symbols for loadable modules.",
     "Normally an executable does not export any symbols because it is "
     "the final program.  It is possible for an executable to export "
     "symbols to be used by loadable modules.  When this property is "
     "set to true CMake will allow other targets to \"link\" to the "
     "executable with the TARGET_LINK_LIBRARIES command.  "
     "On all platforms a target-level dependency on the executable is "
     "created for targets that link to it.  "
     "For non-DLL platforms the link rule is simply ignored since "
     "the dynamic loader will automatically bind symbols when the "
     "module is loaded.  "
     "For DLL platforms an import library will be created for the "
     "exported symbols and then used for linking.  "
     "All Windows-based systems including Cygwin are DLL platforms.");

  cm->DefineProperty
    ("Fortran_MODULE_DIRECTORY", cmProperty::TARGET,
     "Specify output directory for Fortran modules provided by the target.",
     "If the target contains Fortran source files that provide modules "
     "and the compiler supports a module output directory this specifies "
     "the directory in which the modules will be placed.  "
     "When this property is not set the modules will be placed in the "
     "build directory corresponding to the target's source directory.");

  cm->DefineProperty
    ("XCODE_ATTRIBUTE_<an-attribute>", cmProperty::TARGET,
     "Set Xcode target attributes directly.",
     "Tell the Xcode generator to set '<an-attribute>' to a given value "
     "in the generated Xcode project.  Ignored on other generators.");

  cm->DefineProperty
    ("GENERATOR_FILE_NAME", cmProperty::TARGET,
     "Generator's file for this target.",
     "An internal property used by some generators to record the name of "
     "project or dsp file associated with this target.");

  cm->DefineProperty
    ("SOURCES", cmProperty::TARGET,
     "Source names specified for a target.",
     "Read-only list of sources specified for a target.  "
     "The names returned are suitable for passing to the "
     "set_source_files_properties command.");

#if 0
  cm->DefineProperty
    ("OBJECT_FILES", cmProperty::TARGET,
     "Used to get the resulting list of object files that make up a "
     "target.",
     "This can be used to put object files from one library "
     "into another library. It is a read only property.  It "
     "converts the source list for the target into a list of full "
     "paths to object names that will be produced by the target.");
#endif

#define CM_TARGET_FILE_TYPES_DOC                                            \
     "There are three kinds of target files that may be built: "            \
     "archive, library, and runtime.  "                                     \
     "Executables are always treated as runtime targets. "                  \
     "Static libraries are always treated as archive targets. "             \
     "Module libraries are always treated as library targets. "             \
     "For non-DLL platforms shared libraries are treated as library "       \
     "targets. "                                                            \
     "For DLL platforms the DLL part of a shared library is treated as "    \
     "a runtime target and the corresponding import library is treated as " \
     "an archive target. "                                                  \
     "All Windows-based systems including Cygwin are DLL platforms."

  cm->DefineProperty
    ("ARCHIVE_OUTPUT_DIRECTORY", cmProperty::TARGET,
     "Output directory in which to build ARCHIVE target files.",
     "This property specifies the directory into which archive target files "
     "should be built. "
     CM_TARGET_FILE_TYPES_DOC " "
     "This property is initialized by the value of the variable "
     "CMAKE_ARCHIVE_OUTPUT_DIRECTORY if it is set when a target is created.");
  cm->DefineProperty
    ("LIBRARY_OUTPUT_DIRECTORY", cmProperty::TARGET,
     "Output directory in which to build LIBRARY target files.",
     "This property specifies the directory into which library target files "
     "should be built. "
     CM_TARGET_FILE_TYPES_DOC " "
     "This property is initialized by the value of the variable "
     "CMAKE_LIBRARY_OUTPUT_DIRECTORY if it is set when a target is created.");
  cm->DefineProperty
    ("RUNTIME_OUTPUT_DIRECTORY", cmProperty::TARGET,
     "Output directory in which to build RUNTIME target files.",
     "This property specifies the directory into which runtime target files "
     "should be built. "
     CM_TARGET_FILE_TYPES_DOC " "
     "This property is initialized by the value of the variable "
     "CMAKE_RUNTIME_OUTPUT_DIRECTORY if it is set when a target is created.");

  // define some properties without documentation
  cm->DefineProperty("DEBUG_OUTPUT_NAME", cmProperty::TARGET,0,0);
  cm->DefineProperty("RELEASE_OUTPUT_NAME", cmProperty::TARGET,0,0);
}

void cmTarget::SetType(TargetType type, const char* name)
{
  this->Name = name;
  if(type == cmTarget::INSTALL_FILES ||
     type == cmTarget::INSTALL_PROGRAMS ||
     type == cmTarget::INSTALL_DIRECTORY)
    {
    abort();
    }
  // only add dependency information for library targets
  this->TargetTypeValue = type;
  if(this->TargetTypeValue >= STATIC_LIBRARY
     && this->TargetTypeValue <= MODULE_LIBRARY)
    {
    this->RecordDependencies = true;
    }
  else
    {
    this->RecordDependencies = false;
    }
}

//----------------------------------------------------------------------------
void cmTarget::SetMakefile(cmMakefile* mf)
{
  // Set our makefile.
  this->Makefile = mf;

  // set the cmake instance of the properties
  this->Properties.SetCMakeInstance(mf->GetCMakeInstance());

  // Check whether this is a DLL platform.
  this->DLLPlatform = (this->Makefile->IsOn("WIN32") ||
                       this->Makefile->IsOn("CYGWIN") ||
                       this->Makefile->IsOn("MINGW"));

  // Setup default property values.
  this->SetPropertyDefault("INSTALL_NAME_DIR", "");
  this->SetPropertyDefault("INSTALL_RPATH", "");
  this->SetPropertyDefault("INSTALL_RPATH_USE_LINK_PATH", "OFF");
  this->SetPropertyDefault("SKIP_BUILD_RPATH", "OFF");
  this->SetPropertyDefault("BUILD_WITH_INSTALL_RPATH", "OFF");
  this->SetPropertyDefault("ARCHIVE_OUTPUT_DIRECTORY", 0);
  this->SetPropertyDefault("LIBRARY_OUTPUT_DIRECTORY", 0);
  this->SetPropertyDefault("RUNTIME_OUTPUT_DIRECTORY", 0);
  this->SetPropertyDefault("Fortran_MODULE_DIRECTORY", 0);

  // Collect the set of configuration types.
  std::vector<std::string> configNames;
  if(const char* configurationTypes =
     mf->GetDefinition("CMAKE_CONFIGURATION_TYPES"))
    {
    cmSystemTools::ExpandListArgument(configurationTypes, configNames);
    }
  else if(const char* buildType = mf->GetDefinition("CMAKE_BUILD_TYPE"))
    {
    if(*buildType)
      {
      configNames.push_back(buildType);
      }
    }

  // Setup per-configuration property default values.
  for(std::vector<std::string>::iterator ci = configNames.begin();
      ci != configNames.end(); ++ci)
    {
    // Initialize per-configuration name postfix property from the
    // variable only for non-executable targets.  This preserves
    // compatibility with previous CMake versions in which executables
    // did not support this variable.  Projects may still specify the
    // property directly.  TODO: Make this depend on backwards
    // compatibility setting.
    if(this->TargetTypeValue != cmTarget::EXECUTABLE)
      {
      std::string property = cmSystemTools::UpperCase(*ci);
      property += "_POSTFIX";
      this->SetPropertyDefault(property.c_str(), 0);
      }
    }
}

//----------------------------------------------------------------------------
bool cmTarget::IsExecutableWithExports()
{
  return (this->GetType() == cmTarget::EXECUTABLE &&
          this->GetPropertyAsBool("ENABLE_EXPORTS"));
}

//----------------------------------------------------------------------------
bool cmTarget::IsFrameworkOnApple()
{
  return (this->GetType() == cmTarget::SHARED_LIBRARY &&
          this->Makefile->IsOn("APPLE") &&
          this->GetPropertyAsBool("FRAMEWORK"));
}

//----------------------------------------------------------------------------
bool cmTarget::IsAppBundleOnApple()
{
  return (this->GetType() == cmTarget::EXECUTABLE &&
          this->Makefile->IsOn("APPLE") &&
          this->GetPropertyAsBool("MACOSX_BUNDLE"));
}

//----------------------------------------------------------------------------
class cmTargetTraceDependencies
{
public:
  cmTargetTraceDependencies(cmTarget* target, const char* vsProjectFile);
  void Trace();
private:
  cmTarget* Target;
  cmMakefile* Makefile;
  cmGlobalGenerator* GlobalGenerator;
  std::queue<cmStdString> DependencyQueue;
  std::set<cmStdString> DependenciesQueued;
  std::set<cmSourceFile*> TargetSources;

  void QueueOnce(std::string const& name);
  void QueueOnce(std::vector<std::string> const& names);
  void QueueDependencies(cmSourceFile* sf);
  bool IsUtility(std::string const& dep);
  void CheckCustomCommand(cmCustomCommand const& cc);
  void CheckCustomCommands(const std::vector<cmCustomCommand>& commands);
};

//----------------------------------------------------------------------------
cmTargetTraceDependencies
::cmTargetTraceDependencies(cmTarget* target, const char* vsProjectFile):
  Target(target)
{
  // Convenience.
  this->Makefile = this->Target->GetMakefile();
  this->GlobalGenerator =
    this->Makefile->GetLocalGenerator()->GetGlobalGenerator();

  // Queue all the source files already specified for the target.
  std::vector<cmSourceFile*> const& sources = this->Target->GetSourceFiles();
  for(std::vector<cmSourceFile*>::const_iterator si = sources.begin();
      si != sources.end(); ++si)
    {
    // Queue the source file itself in case it is generated.
    this->QueueOnce((*si)->GetFullPath());

    // Queue the dependencies of the source file in case they are
    // generated.
    this->QueueDependencies(*si);

    // Track the sources already known to the target.
    this->TargetSources.insert(*si);
    }

  // Queue the VS project file to check dependencies on the rule to
  // generate it.
  if(vsProjectFile)
    {
    this->QueueOnce(vsProjectFile);
    }

  // Queue pre-build, pre-link, and post-build rule dependencies.
  this->CheckCustomCommands(this->Target->GetPreBuildCommands());
  this->CheckCustomCommands(this->Target->GetPreLinkCommands());
  this->CheckCustomCommands(this->Target->GetPostBuildCommands());
}

//----------------------------------------------------------------------------
void cmTargetTraceDependencies::Trace()
{
  // Process one dependency at a time until the queue is empty.
  while(!this->DependencyQueue.empty())
    {
    // Get the next dependency in from queue.
    std::string dep = this->DependencyQueue.front();
    this->DependencyQueue.pop();

    // Check if we know how to generate this dependency.
    if(cmSourceFile* sf =
       this->Makefile->GetSourceFileWithOutput(dep.c_str()))
      {
      // Queue dependencies needed to generate this file.
      this->QueueDependencies(sf);

      // Make sure this file is in the target.
      if(this->TargetSources.insert(sf).second)
        {
        this->Target->AddSourceFile(sf);
        }
      }
    }
}

//----------------------------------------------------------------------------
void cmTargetTraceDependencies::QueueOnce(std::string const& name)
{
  if(this->DependenciesQueued.insert(name).second)
    {
    this->DependencyQueue.push(name);
    }
}

//----------------------------------------------------------------------------
void
cmTargetTraceDependencies::QueueOnce(std::vector<std::string> const& names)
{
  for(std::vector<std::string>::const_iterator i = names.begin();
      i != names.end(); ++i)
    {
    this->QueueOnce(*i);
    }
}

//----------------------------------------------------------------------------
bool cmTargetTraceDependencies::IsUtility(std::string const& dep)
{
  // Dependencies on targets (utilities) are supposed to be named by
  // just the target name.  However for compatibility we support
  // naming the output file generated by the target (assuming there is
  // no output-name property which old code would not have set).  In
  // that case the target name will be the file basename of the
  // dependency.
  std::string util = cmSystemTools::GetFilenameName(dep);
  if(cmSystemTools::GetFilenameLastExtension(util) == ".exe")
    {
    util = cmSystemTools::GetFilenameWithoutLastExtension(util);
    }

  // Check for a non-imported target with this name.
  if(cmTarget* t = this->GlobalGenerator->FindTarget(0, util.c_str()))
    {
    // If we find the target and the dep was given as a full path,
    // then make sure it was not a full path to something else, and
    // the fact that the name matched a target was just a coincidence.
    if(cmSystemTools::FileIsFullPath(dep.c_str()))
      {
      // This is really only for compatibility so we do not need to
      // worry about configuration names and output names.
      std::string tLocation = t->GetLocation(0);
      tLocation = cmSystemTools::GetFilenamePath(tLocation);
      std::string depLocation = cmSystemTools::GetFilenamePath(dep);
      depLocation = cmSystemTools::CollapseFullPath(depLocation.c_str());
      tLocation = cmSystemTools::CollapseFullPath(tLocation.c_str());
      if(depLocation == tLocation)
        {
        this->Target->AddUtility(util.c_str());
        return true;
        }
      }
    else
      {
      // The original name of the dependency was not a full path.  It
      // must name a target, so add the target-level dependency.
      this->Target->AddUtility(util.c_str());
      return true;
      }
    }

  // The dependency does not name a target built in this project.
  return false;
}

//----------------------------------------------------------------------------
void cmTargetTraceDependencies::QueueDependencies(cmSourceFile* sf)
{
  // Queue dependency added explicitly by the user.
  if(const char* additionalDeps = sf->GetProperty("OBJECT_DEPENDS"))
    {
    std::vector<std::string> objDeps;
    cmSystemTools::ExpandListArgument(additionalDeps, objDeps);
    this->QueueOnce(objDeps);
    }

  // Queue dependencies added programatically by commands.
  this->QueueOnce(sf->GetDepends());

  // Queue custom command dependencies.
  if(cmCustomCommand const* cc = sf->GetCustomCommand())
    {
    this->CheckCustomCommand(*cc);
    }

}

//----------------------------------------------------------------------------
void
cmTargetTraceDependencies
::CheckCustomCommand(cmCustomCommand const& cc)
{
  // Transform command names that reference targets built in this
  // project to corresponding target-level dependencies.
  for(cmCustomCommandLines::const_iterator cit = cc.GetCommandLines().begin();
      cit != cc.GetCommandLines().end(); ++cit)
    {
    std::string const& command = *cit->begin();
    // Look for a non-imported target with this name.
    if(cmTarget* t = this->GlobalGenerator->FindTarget(0, command.c_str()))
      {
      if(t->GetType() == cmTarget::EXECUTABLE)
        {
        // The command refers to an executable target built in
        // this project.  Add the target-level dependency to make
        // sure the executable is up to date before this custom
        // command possibly runs.
        this->Target->AddUtility(command.c_str());
        }
      }
    }

  // Queue the custom command dependencies.
  std::vector<std::string> const& depends = cc.GetDepends();
  for(std::vector<std::string>::const_iterator di = depends.begin();
      di != depends.end(); ++di)
    {
    std::string const& dep = *di;
    if(!this->IsUtility(dep))
      {
      // The dependency does not name a target and may be a file we
      // know how to generate.  Queue it.
      this->QueueOnce(dep);
      }
    }
}

//----------------------------------------------------------------------------
void
cmTargetTraceDependencies
::CheckCustomCommands(const std::vector<cmCustomCommand>& commands)
{
  for(std::vector<cmCustomCommand>::const_iterator cli = commands.begin();
      cli != commands.end(); ++cli)
    {
    this->CheckCustomCommand(*cli);
    }
}

//----------------------------------------------------------------------------
void cmTarget::TraceDependencies(const char* vsProjectFile)
{
  // Use a helper object to trace the dependencies.
  cmTargetTraceDependencies tracer(this, vsProjectFile);
  tracer.Trace();
}

//----------------------------------------------------------------------------
void cmTarget::AddSources(std::vector<std::string> const& srcs)
{
  for(std::vector<std::string>::const_iterator i = srcs.begin();
      i != srcs.end(); ++i)
    {
    this->AddSource(i->c_str());
    }
}

//----------------------------------------------------------------------------
cmSourceFile* cmTarget::AddSource(const char* s)
{
  std::string src = s;

  // For backwards compatibility replace varibles in source names.
  // This should eventually be removed.
  this->Makefile->ExpandVariablesInString(src);

  cmSourceFile* sf = this->Makefile->GetOrCreateSource(src.c_str());
  this->AddSourceFile(sf);
  return sf;
}

//----------------------------------------------------------------------------
struct cmTarget::SourceFileFlags
cmTarget::GetTargetSourceFileFlags(const cmSourceFile* sf)
{
  struct SourceFileFlags flags;
  const char* files;
  std::vector<std::string>::iterator it;

  flags.PrivateHeader = false;
  flags.PublicHeader = false;
  flags.Resource = false;

  files = this->GetProperty("PRIVATE_HEADER");
  if ((files) && (*files))
    {
    std::vector<std::string> relFiles;
    cmSystemTools::ExpandListArgument(files, relFiles);
    for(it = relFiles.begin(); it != relFiles.end(); ++it)
      {
      if(sf == this->GetMakefile()->GetSource(it->c_str()))
        {
        flags.PrivateHeader = true;
        break;
        }
      }
    }

  // Only consider marking it as a public header if it is *NOT* already marked
  // as a private header:
  //
  if(!flags.PrivateHeader)
    {
    files = this->GetProperty("PUBLIC_HEADER");
    if ((files) && (*files))
      {
      std::vector<std::string> relFiles;
      cmSystemTools::ExpandListArgument(files, relFiles);
      for(it = relFiles.begin(); it != relFiles.end(); ++it)
        {
        if(sf == this->GetMakefile()->GetSource(it->c_str()))
          {
          flags.PublicHeader = true;
          break;
          }
        }
      }
    }

  const char* location = sf->GetProperty("MACOSX_PACKAGE_LOCATION");
  if(location && cmStdString(location) == "Resources")
    {
    flags.Resource = true;
    }

  // Don't bother with the loop if it's already marked as a resource:
  //
  if(!flags.Resource)
    {
    files = this->GetProperty("RESOURCE");
    if ((files) && (*files))
      {
      std::vector<std::string> relFiles;
      cmSystemTools::ExpandListArgument(files, relFiles);
      for(it = relFiles.begin(); it != relFiles.end(); ++it)
        {
        if(sf == this->GetMakefile()->GetSource(it->c_str()))
          {
          flags.Resource = true;
          break;
          }
        }
      }
    }

  return flags;
}

//----------------------------------------------------------------------------
void cmTarget::MergeLinkLibraries( cmMakefile& mf,
                                   const char *selfname,
                                   const LinkLibraryVectorType& libs )
{
  // Only add on libraries we haven't added on before.
  // Assumption: the global link libraries could only grow, never shrink
  LinkLibraryVectorType::const_iterator i = libs.begin();
  i += this->PrevLinkedLibraries.size();
  for( ; i != libs.end(); ++i )
    {
    // We call this so that the dependencies get written to the cache
    this->AddLinkLibrary( mf, selfname, i->first.c_str(), i->second );
    }
  this->PrevLinkedLibraries = libs;
}

//----------------------------------------------------------------------------
void cmTarget::AddLinkDirectory(const char* d)
{
  // Make sure we don't add unnecessary search directories.
  if(this->LinkDirectoriesEmmitted.insert(d).second)
    {
    this->LinkDirectories.push_back(d);
    }
}

//----------------------------------------------------------------------------
const std::vector<std::string>& cmTarget::GetLinkDirectories()
{
  return this->LinkDirectories;
}

//----------------------------------------------------------------------------
void cmTarget::ClearDependencyInformation( cmMakefile& mf,
                                           const char* target )
{
  // Clear the dependencies. The cache variable must exist iff we are
  // recording dependency information for this target.
  std::string depname = target;
  depname += "_LIB_DEPENDS";
  if (this->RecordDependencies)
    {
    mf.AddCacheDefinition(depname.c_str(), "",
                          "Dependencies for target", cmCacheManager::STATIC);
    }
  else
    {
    if (mf.GetDefinition( depname.c_str() ))
      {
      std::string message = "Target ";
      message += target;
      message += " has dependency information when it shouldn't.\n";
      message += "Your cache is probably stale. Please remove the entry\n  ";
      message += depname;
      message += "\nfrom the cache.";
      cmSystemTools::Error( message.c_str() );
      }
    }
}

//----------------------------------------------------------------------------
void cmTarget::AddLinkLibrary(const std::string& lib,
                              LinkLibraryType llt)
{
  this->AddFramework(lib.c_str(), llt);
  cmTarget::LibraryID tmp;
  tmp.first = lib;
  tmp.second = llt;
  this->LinkLibraries.push_back(tmp);
  this->OriginalLinkLibraries.push_back(tmp);
}

//----------------------------------------------------------------------------
bool cmTarget::NameResolvesToFramework(const std::string& libname)
{
  return this->GetMakefile()->GetLocalGenerator()->GetGlobalGenerator()->
    NameResolvesToFramework(libname);
}

//----------------------------------------------------------------------------
bool cmTarget::AddFramework(const std::string& libname, LinkLibraryType llt)
{
  (void)llt; // TODO: What is this?
  if(this->NameResolvesToFramework(libname.c_str()))
    {
    std::string frameworkDir = libname;
    frameworkDir += "/../";
    frameworkDir = cmSystemTools::CollapseFullPath(frameworkDir.c_str());
    std::vector<std::string>::iterator i =
      std::find(this->Frameworks.begin(),
                this->Frameworks.end(), frameworkDir);
    if(i == this->Frameworks.end())
      {
      this->Frameworks.push_back(frameworkDir);
      }
    return true;
    }
  return false;
}

//----------------------------------------------------------------------------
void cmTarget::AddLinkLibrary(cmMakefile& mf,
                              const char *target, const char* lib,
                              LinkLibraryType llt)
{
  // Never add a self dependency, even if the user asks for it.
  if(strcmp( target, lib ) == 0)
    {
    return;
    }
  this->AddFramework(lib, llt);
  cmTarget::LibraryID tmp;
  tmp.first = lib;
  tmp.second = llt;
  this->LinkLibraries.push_back( tmp );
  this->OriginalLinkLibraries.push_back(tmp);

  // Add the explicit dependency information for this target. This is
  // simply a set of libraries separated by ";". There should always
  // be a trailing ";". These library names are not canonical, in that
  // they may be "-framework x", "-ly", "/path/libz.a", etc.
  // We shouldn't remove duplicates here because external libraries
  // may be purposefully duplicated to handle recursive dependencies,
  // and we removing one instance will break the link line. Duplicates
  // will be appropriately eliminated at emit time.
  if(this->RecordDependencies)
    {
    std::string targetEntry = target;
    targetEntry += "_LIB_DEPENDS";
    std::string dependencies;
    const char* old_val = mf.GetDefinition( targetEntry.c_str() );
    if( old_val )
      {
      dependencies += old_val;
      }
    switch (llt)
      {
      case cmTarget::GENERAL:
        dependencies += "general";
        break;
      case cmTarget::DEBUG:
        dependencies += "debug";
        break;
      case cmTarget::OPTIMIZED:
        dependencies += "optimized";
        break;
      }
    dependencies += ";";
    dependencies += lib;
    dependencies += ";";
    mf.AddCacheDefinition( targetEntry.c_str(), dependencies.c_str(),
                           "Dependencies for the target",
                           cmCacheManager::STATIC );
    }

}

//----------------------------------------------------------------------------
void
cmTarget::AnalyzeLibDependencies( const cmMakefile& mf )
{
  // There are two key parts of the dependency analysis: (1)
  // determining the libraries in the link line, and (2) constructing
  // the dependency graph for those libraries.
  //
  // The latter is done using the cache entries that record the
  // dependencies of each library.
  //
  // The former is a more thorny issue, since it is not clear how to
  // determine if two libraries listed on the link line refer to the a
  // single library or not. For example, consider the link "libraries"
  //    /usr/lib/libtiff.so -ltiff
  // Is this one library or two? The solution implemented here is the
  // simplest (and probably the only practical) one: two libraries are
  // the same if their "link strings" are identical. Thus, the two
  // libraries above are considered distinct. This also means that for
  // dependency analysis to be effective, the CMake user must specify
  // libraries build by his project without using any linker flags or
  // file extensions. That is,
  //    LINK_LIBRARIES( One Two )
  // instead of
  //    LINK_LIBRARIES( -lOne ${binarypath}/libTwo.a )
  // The former is probably what most users would do, but it never
  // hurts to document the assumptions. :-) Therefore, in the analysis
  // code, the "canonical name" of a library is simply its name as
  // given to a LINK_LIBRARIES command.
  //
  // Also, we will leave the original link line intact; we will just add any
  // dependencies that were missing.
  //
  // There is a problem with recursive external libraries
  // (i.e. libraries with no dependency information that are
  // recursively dependent). We must make sure that the we emit one of
  // the libraries twice to satisfy the recursion, but we shouldn't
  // emit it more times than necessary. In particular, we must make
  // sure that handling this improbable case doesn't cost us when
  // dealing with the common case of non-recursive libraries. The
  // solution is to assume that the recursion is satisfied at one node
  // of the dependency tree. To illustrate, assume libA and libB are
  // extrenal and mutually dependent. Suppose libX depends on
  // libA, and libY on libA and libX. Then
  //   TARGET_LINK_LIBRARIES( Y X A B A )
  //   TARGET_LINK_LIBRARIES( X A B A )
  //   TARGET_LINK_LIBRARIES( Exec Y )
  // would result in "-lY -lX -lA -lB -lA". This is the correct way to
  // specify the dependencies, since the mutual dependency of A and B
  // is resolved *every time libA is specified*.
  //
  // Something like
  //   TARGET_LINK_LIBRARIES( Y X A B A )
  //   TARGET_LINK_LIBRARIES( X A B )
  //   TARGET_LINK_LIBRARIES( Exec Y )
  // would result in "-lY -lX -lA -lB", and the mutual dependency
  // information is lost. This is because in some case (Y), the mutual
  // dependency of A and B is listed, while in another other case (X),
  // it is not. Depending on which line actually emits A, the mutual
  // dependency may or may not be on the final link line.  We can't
  // handle this pathalogical case cleanly without emitting extra
  // libraries for the normal cases. Besides, the dependency
  // information for X is wrong anyway: if we build an executable
  // depending on X alone, we would not have the mutual dependency on
  // A and B resolved.
  //
  // IMPROVEMENTS:
  // -- The current algorithm will not always pick the "optimal" link line
  //    when recursive dependencies are present. It will instead break the
  //    cycles at an aribtrary point. The majority of projects won't have
  //    cyclic dependencies, so this is probably not a big deal. Note that
  //    the link line is always correct, just not necessary optimal.

 {
 // Expand variables in link library names.  This is for backwards
 // compatibility with very early CMake versions and should
 // eventually be removed.  This code was moved here from the end of
 // old source list processing code which was called just before this
 // method.
 for(LinkLibraryVectorType::iterator p = this->LinkLibraries.begin();
     p != this->LinkLibraries.end(); ++p)
   {
   this->Makefile->ExpandVariablesInString(p->first, true, true);
   }
 }

 typedef std::vector< std::string > LinkLine;

 // The dependency map.
 DependencyMap dep_map;

 // 1. Build the dependency graph
 //
 for(LinkLibraryVectorType::reverse_iterator lib
       = this->LinkLibraries.rbegin();
     lib != this->LinkLibraries.rend(); ++lib)
   {
   this->GatherDependencies( mf, *lib, dep_map);
   }

 // 2. Remove any dependencies that are already satisfied in the original
 // link line.
 //
 for(LinkLibraryVectorType::iterator lib = this->LinkLibraries.begin();
     lib != this->LinkLibraries.end(); ++lib)
   {
   for( LinkLibraryVectorType::iterator lib2 = lib;
        lib2 != this->LinkLibraries.end(); ++lib2)
     {
     this->DeleteDependency( dep_map, *lib, *lib2);
     }
   }


 // 3. Create the new link line by simply emitting any dependencies that are
 // missing.  Start from the back and keep adding.
 //
 std::set<DependencyMap::key_type> done, visited;
 std::vector<DependencyMap::key_type> newLinkLibraries;
 for(LinkLibraryVectorType::reverse_iterator lib =
       this->LinkLibraries.rbegin();
     lib != this->LinkLibraries.rend(); ++lib)
   {
   // skip zero size library entries, this may happen
   // if a variable expands to nothing.
   if (lib->first.size() != 0)
     {
     this->Emit( *lib, dep_map, done, visited, newLinkLibraries );
     }
   }

 // 4. Add the new libraries to the link line.
 //
 for( std::vector<DependencyMap::key_type>::reverse_iterator k =
        newLinkLibraries.rbegin();
      k != newLinkLibraries.rend(); ++k )
   {
   // get the llt from the dep_map
   this->LinkLibraries.push_back( std::make_pair(k->first,k->second) );
   }
 this->LinkLibrariesAnalyzed = true;
}

//----------------------------------------------------------------------------
void cmTarget::InsertDependency( DependencyMap& depMap,
                                 const LibraryID& lib,
                                 const LibraryID& dep)
{
  depMap[lib].push_back(dep);
}

//----------------------------------------------------------------------------
void cmTarget::DeleteDependency( DependencyMap& depMap,
                                 const LibraryID& lib,
                                 const LibraryID& dep)
{
  // Make sure there is an entry in the map for lib. If so, delete all
  // dependencies to dep. There may be repeated entries because of
  // external libraries that are specified multiple times.
  DependencyMap::iterator map_itr = depMap.find( lib );
  if( map_itr != depMap.end() )
    {
    DependencyList& depList = map_itr->second;
    DependencyList::iterator itr;
    while( (itr = std::find(depList.begin(), depList.end(), dep)) !=
           depList.end() )
      {
      depList.erase( itr );
      }
    }
}

//----------------------------------------------------------------------------
void cmTarget::Emit(const LibraryID lib,
                    const DependencyMap& dep_map,
                    std::set<LibraryID>& emitted,
                    std::set<LibraryID>& visited,
                    DependencyList& link_line )
{
  // It's already been emitted
  if( emitted.find(lib) != emitted.end() )
    {
    return;
    }

  // Emit the dependencies only if this library node hasn't been
  // visited before. If it has, then we have a cycle. The recursion
  // that got us here should take care of everything.

  if( visited.insert(lib).second )
    {
    if( dep_map.find(lib) != dep_map.end() ) // does it have dependencies?
      {
      const DependencyList& dep_on = dep_map.find( lib )->second;
      DependencyList::const_reverse_iterator i;

      // To cater for recursive external libraries, we must emit
      // duplicates on this link line *unless* they were emitted by
      // some other node, in which case we assume that the recursion
      // was resolved then. We making the simplifying assumption that
      // any duplicates on a single link line are on purpose, and must
      // be preserved.

      // This variable will keep track of the libraries that were
      // emitted directory from the current node, and not from a
      // recursive call. This way, if we come across a library that
      // has already been emitted, we repeat it iff it has been
      // emitted here.
      std::set<DependencyMap::key_type> emitted_here;
      for( i = dep_on.rbegin(); i != dep_on.rend(); ++i )
        {
        if( emitted_here.find(*i) != emitted_here.end() )
          {
          // a repeat. Must emit.
          emitted.insert(*i);
          link_line.push_back( *i );
          }
        else
          {
          // Emit only if no-one else has
          if( emitted.find(*i) == emitted.end() )
            {
            // emit dependencies
            Emit( *i, dep_map, emitted, visited, link_line );
            // emit self
            emitted.insert(*i);
            emitted_here.insert(*i);
            link_line.push_back( *i );
            }
          }
        }
      }
    }
}

//----------------------------------------------------------------------------
void cmTarget::GatherDependencies( const cmMakefile& mf,
                                   const LibraryID& lib,
                                   DependencyMap& dep_map)
{
  // If the library is already in the dependency map, then it has
  // already been fully processed.
  if( dep_map.find(lib) != dep_map.end() )
    {
    return;
    }

  const char* deps = mf.GetDefinition( (lib.first+"_LIB_DEPENDS").c_str() );
  if( deps && strcmp(deps,"") != 0 )
    {
    // Make sure this library is in the map, even if it has an empty
    // set of dependencies. This distinguishes the case of explicitly
    // no dependencies with that of unspecified dependencies.
    dep_map[lib];

    // Parse the dependency information, which is a set of
    // type, library pairs separated by ";". There is always a trailing ";".
    cmTarget::LinkLibraryType llt = cmTarget::GENERAL;
    std::string depline = deps;
    std::string::size_type start = 0;
    std::string::size_type end;
    end = depline.find( ";", start );
    while( end != std::string::npos )
      {
      std::string l = depline.substr( start, end-start );
      if( l.size() != 0 )
        {
        if (l == "debug")
          {
          llt = cmTarget::DEBUG;
          }
        else if (l == "optimized")
          {
          llt = cmTarget::OPTIMIZED;
          }
        else if (l == "general")
          {
          llt = cmTarget::GENERAL;
          }
        else
          {
          LibraryID lib2(l,llt);
          this->InsertDependency( dep_map, lib, lib2);
          this->GatherDependencies( mf, lib2, dep_map);
          llt = cmTarget::GENERAL;
          }
        }
      start = end+1; // skip the ;
      end = depline.find( ";", start );
      }
    // cannot depend on itself
    this->DeleteDependency( dep_map, lib, lib);
    }
}

//----------------------------------------------------------------------------
void cmTarget::SetProperty(const char* prop, const char* value)
{
  if (!prop)
    {
    return;
    }
  if (!value)
    {
    value = "NOTFOUND";
    }

  this->Properties.SetProperty(prop, value, cmProperty::TARGET);

  // If imported information is being set, wipe out cached
  // information.
  if(this->IsImported() && strncmp(prop, "IMPORTED", 8) == 0)
    {
    this->ImportInfoMap.clear();
    }
}

//----------------------------------------------------------------------------
void cmTarget::AppendProperty(const char* prop, const char* value)
{
  if (!prop)
    {
    return;
    }
  this->Properties.AppendProperty(prop, value, cmProperty::TARGET);

  // If imported information is being set, wipe out cached
  // information.
  if(this->IsImported() && strncmp(prop, "IMPORTED", 8) == 0)
    {
    this->ImportInfoMap.clear();
    }
}

//----------------------------------------------------------------------------
void cmTarget::MarkAsImported()
{
  this->IsImportedTarget = true;
}

//----------------------------------------------------------------------------
const char* cmTarget::GetDirectory(const char* config, bool implib)
{
  if (this->IsImported())
    {
    return this->ImportedGetDirectory(config, implib);
    }
  else
    {
    return this->NormalGetDirectory(config, implib);
    }
}

//----------------------------------------------------------------------------
const char* cmTarget::ImportedGetDirectory(const char* config, bool implib)
{
  this->Directory =
    cmSystemTools::GetFilenamePath(
      this->ImportedGetFullPath(config, implib));
  return this->Directory.c_str();
}

//----------------------------------------------------------------------------
const char* cmTarget::NormalGetDirectory(const char* config, bool implib)
{
  if(config && *config)
    {
    // Do not create the directory when config is given:
    this->Directory = this->GetAndCreateOutputDir(implib, true);
    // Add the configuration's subdirectory.
    this->Makefile->GetLocalGenerator()->GetGlobalGenerator()->
      AppendDirectoryForConfig("/", config, "", this->Directory);
    return this->Directory.c_str();
    }
  else
    {
    return this->GetOutputDir(implib);
    }
}

//----------------------------------------------------------------------------
const char* cmTarget::GetLocation(const char* config)
{
  if (this->IsImported())
    {
    return this->ImportedGetLocation(config);
    }
  else
    {
    return this->NormalGetLocation(config);
    }
}

//----------------------------------------------------------------------------
const char* cmTarget::ImportedGetLocation(const char* config)
{
  this->Location = this->ImportedGetFullPath(config, false);
  return this->Location.c_str();
}

//----------------------------------------------------------------------------
const char* cmTarget::NormalGetLocation(const char* config)
{
  this->Location = this->GetDirectory(config);
  if(!this->Location.empty())
    {
    this->Location += "/";
    }
  if(!config)
    {
    // No specific configuration was given so it will not appear on
    // the result of GetDirectory.  Add a name here to be replaced at
    // build time.
    const char* cfgid = this->Makefile->GetDefinition("CMAKE_CFG_INTDIR");
    if(cfgid && strcmp(cfgid, ".") != 0)
      {
      this->Location += cfgid;
      this->Location += "/";
      }
    }
  this->Location += this->GetFullName(config, false);
  return this->Location.c_str();
}

//----------------------------------------------------------------------------
void cmTarget::GetTargetVersion(int& major, int& minor)
{
  // Set the default values.
  major = 0;
  minor = 0;

  // Look for a VERSION property.
  if(const char* version = this->GetProperty("VERSION"))
    {
    // Try to parse the version number and store the results that were
    // successfully parsed.
    int parsed_major;
    int parsed_minor;
    switch(sscanf(version, "%d.%d", &parsed_major, &parsed_minor))
      {
      case 2: minor = parsed_minor; // no break!
      case 1: major = parsed_major; // no break!
      default: break;
      }
    }
}

//----------------------------------------------------------------------------
const char *cmTarget::GetProperty(const char* prop)
{
  return this->GetProperty(prop, cmProperty::TARGET);
}

//----------------------------------------------------------------------------
void cmTarget::ComputeObjectFiles()
{
  if (this->IsImported())
    {
    return;
    }
#if 0
  std::vector<std::string> dirs;
  this->Makefile->GetLocalGenerator()->
    GetTargetObjectFileDirectories(this,
                                   dirs);
  std::string objectFiles;
  std::string objExtensionLookup1 = "CMAKE_";
  std::string objExtensionLookup2 = "_OUTPUT_EXTENSION";

  for(std::vector<std::string>::iterator d = dirs.begin();
      d != dirs.end(); ++d)
    {
    for(std::vector<cmSourceFile*>::iterator s = this->SourceFiles.begin();
        s != this->SourceFiles.end(); ++s)
      {
      cmSourceFile* sf = *s;
      if(const char* lang = sf->GetLanguage())
        {
        std::string lookupObj = objExtensionLookup1 + lang;
        lookupObj += objExtensionLookup2;
        const char* obj = this->Makefile->GetDefinition(lookupObj.c_str());
        if(obj)
          {
          if(objectFiles.size())
            {
            objectFiles += ";";
            }
          std::string objFile = *d;
          objFile += "/";
          objFile += this->Makefile->GetLocalGenerator()->
            GetSourceObjectName(*sf);
          objFile += obj;
          objectFiles += objFile;
          }
        }
      }
    }
  this->SetProperty("OBJECT_FILES", objectFiles.c_str());
#endif
}

//----------------------------------------------------------------------------
const char *cmTarget::GetProperty(const char* prop,
                                  cmProperty::ScopeType scope)
{
  if(!prop)
    {
    return 0;
    }

  // Watch for special "computed" properties that are dependent on
  // other properties or variables.  Always recompute them.
  if(this->GetType() == cmTarget::EXECUTABLE ||
     this->GetType() == cmTarget::STATIC_LIBRARY ||
     this->GetType() == cmTarget::SHARED_LIBRARY ||
     this->GetType() == cmTarget::MODULE_LIBRARY)
    {
    if(!this->IsImported() && strcmp(prop,"LOCATION") == 0)
      {
      // Set the LOCATION property of the target.  Note that this
      // cannot take into account the per-configuration name of the
      // target because the configuration type may not be known at
      // CMake time.  It is now deprecated as described in the
      // documentation.
      this->SetProperty("LOCATION", this->GetLocation(0));
      }

    // Support "LOCATION_<CONFIG>".
    if(strncmp(prop, "LOCATION_", 9) == 0)
      {
      std::string configName = prop+9;
      this->SetProperty(prop, this->GetLocation(configName.c_str()));
      }
    else
      {
      // Support "<CONFIG>_LOCATION" for compatiblity.
      int len = static_cast<int>(strlen(prop));
      if(len > 9 && strcmp(prop+len-9, "_LOCATION") == 0)
        {
        std::string configName(prop, len-9);
        if(configName != "IMPORTED")
          {
          this->SetProperty(prop, this->GetLocation(configName.c_str()));
          }
        }
      }
    }

  if (strcmp(prop,"IMPORTED") == 0)
    {
    return this->IsImported()?"TRUE":"FALSE";
    }

  if(!strcmp(prop,"SOURCES"))
    {
    cmOStringStream ss;
    const char* sep = "";
    for(std::vector<cmSourceFile*>::const_iterator
          i = this->SourceFiles.begin();
        i != this->SourceFiles.end(); ++i)
      {
      // Separate from the previous list entries.
      ss << sep;
      sep = ";";

      // Construct what is known about this source file location.
      cmSourceFileLocation const& location = (*i)->GetLocation();
      std::string sname = location.GetDirectory();
      if(!sname.empty())
        {
        sname += "/";
        }
      sname += location.GetName();

      // Append this list entry.
      ss << sname;
      }
    this->SetProperty("SOURCES", ss.str().c_str());
    }

  // the type property returns what type the target is
  if (!strcmp(prop,"TYPE"))
    {
    switch( this->GetType() )
      {
      case cmTarget::STATIC_LIBRARY:
        return "STATIC_LIBRARY";
        // break; /* unreachable */
      case cmTarget::MODULE_LIBRARY:
        return "MODULE_LIBRARY";
        // break; /* unreachable */
      case cmTarget::SHARED_LIBRARY:
        return "SHARED_LIBRARY";
        // break; /* unreachable */
      case cmTarget::EXECUTABLE:
        return "EXECUTABLE";
        // break; /* unreachable */
      case cmTarget::UTILITY:
        return "UTILITY";
        // break; /* unreachable */
      case cmTarget::GLOBAL_TARGET:
        return "GLOBAL_TARGET";
        // break; /* unreachable */
      case cmTarget::INSTALL_FILES:
        return "INSTALL_FILES";
        // break; /* unreachable */
      case cmTarget::INSTALL_PROGRAMS:
        return "INSTALL_PROGRAMS";
        // break; /* unreachable */
      case cmTarget::INSTALL_DIRECTORY:
        return "INSTALL_DIRECTORY";
        // break; /* unreachable */
      }
    return 0;
    }
  bool chain = false;
  const char *retVal =
    this->Properties.GetPropertyValue(prop, scope, chain);
  if (chain)
    {
    return this->Makefile->GetProperty(prop,scope);
    }
  return retVal;
}

//----------------------------------------------------------------------------
bool cmTarget::GetPropertyAsBool(const char* prop)
{
  return cmSystemTools::IsOn(this->GetProperty(prop));
}

//----------------------------------------------------------------------------
const char* cmTarget::GetLinkerLanguage(cmGlobalGenerator* gg)
{
  if(this->GetProperty("HAS_CXX"))
    {
    const_cast<cmTarget*>(this)->SetProperty("LINKER_LANGUAGE", "CXX");
    }
  const char* linkerLang = this->GetProperty("LINKER_LANGUAGE");
  if (linkerLang==0)
    {
    // if the property has not yet been set, collect all languages in the
    // target and then find the language with the highest preference value
    std::set<cmStdString> languages;
    this->GetLanguages(languages);

    std::string linkerLangList;              // only used for the error message
    int maxLinkerPref = 0;
    bool multiplePreferedLanguages = false;
    for(std::set<cmStdString>::const_iterator sit = languages.begin();
        sit != languages.end(); ++sit)
      {
      int linkerPref = gg->GetLinkerPreference(sit->c_str());
      if ((linkerPref > maxLinkerPref) || (linkerLang==0))
        {
        maxLinkerPref = linkerPref;
        linkerLang = sit->c_str();
        linkerLangList = *sit;
        multiplePreferedLanguages = false;
        }
      else if (linkerPref == maxLinkerPref)
        {
        linkerLangList += "; ";
        linkerLangList += *sit;
        multiplePreferedLanguages = true;
        }
      }

    if (linkerLang!=0)
      {
      const_cast<cmTarget*>(this)->SetProperty("LINKER_LANGUAGE", linkerLang);
      }
    if (multiplePreferedLanguages)
      {
      cmOStringStream err;
      err << "Error: Target " << this->Name << " contains multiple languages "
          << "with the highest linker preference (" << maxLinkerPref << "): " 
          << linkerLangList << "\n"
          << "You must set the LINKER_LANGUAGE property for this target.";
      cmSystemTools::Error(err.str().c_str());
      }
    }
  return this->GetProperty("LINKER_LANGUAGE");
}

//----------------------------------------------------------------------------
const char* cmTarget::GetCreateRuleVariable()
{
  switch(this->GetType())
    {
    case cmTarget::STATIC_LIBRARY:
      return "_CREATE_STATIC_LIBRARY";
    case cmTarget::SHARED_LIBRARY:
      return "_CREATE_SHARED_LIBRARY";
    case cmTarget::MODULE_LIBRARY:
      return "_CREATE_SHARED_MODULE";
    case cmTarget::EXECUTABLE:
      return "_LINK_EXECUTABLE";
    case cmTarget::UTILITY:
    case cmTarget::GLOBAL_TARGET:
    case cmTarget::INSTALL_FILES:
    case cmTarget::INSTALL_PROGRAMS:
    case cmTarget::INSTALL_DIRECTORY:
      break;
    }
  return "";
}

//----------------------------------------------------------------------------
const char* cmTarget::GetSuffixVariableInternal(TargetType type,
                                                bool implib)
{
  switch(type)
    {
    case cmTarget::STATIC_LIBRARY:
      return "CMAKE_STATIC_LIBRARY_SUFFIX";
    case cmTarget::SHARED_LIBRARY:
      return (implib
              ? "CMAKE_IMPORT_LIBRARY_SUFFIX"
              : "CMAKE_SHARED_LIBRARY_SUFFIX");
    case cmTarget::MODULE_LIBRARY:
      return (implib
              ? "CMAKE_IMPORT_LIBRARY_SUFFIX"
              : "CMAKE_SHARED_MODULE_SUFFIX");
    case cmTarget::EXECUTABLE:
      return (implib
              ? "CMAKE_IMPORT_LIBRARY_SUFFIX"
              : "CMAKE_EXECUTABLE_SUFFIX");
    case cmTarget::UTILITY:
    case cmTarget::GLOBAL_TARGET:
    case cmTarget::INSTALL_FILES:
    case cmTarget::INSTALL_PROGRAMS:
    case cmTarget::INSTALL_DIRECTORY:
      break;
    }
  return "";
}


//----------------------------------------------------------------------------
const char* cmTarget::GetPrefixVariableInternal(TargetType type,
                                                bool implib)
{
  switch(type)
    {
    case cmTarget::STATIC_LIBRARY:
      return "CMAKE_STATIC_LIBRARY_PREFIX";
    case cmTarget::SHARED_LIBRARY:
      return (implib
              ? "CMAKE_IMPORT_LIBRARY_PREFIX"
              : "CMAKE_SHARED_LIBRARY_PREFIX");
    case cmTarget::MODULE_LIBRARY:
      return (implib
              ? "CMAKE_IMPORT_LIBRARY_PREFIX"
              : "CMAKE_SHARED_MODULE_PREFIX");
    case cmTarget::EXECUTABLE:
      return (implib? "CMAKE_IMPORT_LIBRARY_PREFIX" : "");
    case cmTarget::UTILITY:
    case cmTarget::GLOBAL_TARGET:
    case cmTarget::INSTALL_FILES:
    case cmTarget::INSTALL_PROGRAMS:
    case cmTarget::INSTALL_DIRECTORY:
      break;
    }
  return "";
}

//----------------------------------------------------------------------------
std::string cmTarget::GetPDBName(const char* config)
{
  std::string prefix;
  std::string base;
  std::string suffix;
  this->GetFullNameInternal(this->GetType(), config, false,
                            prefix, base, suffix);
  return prefix+base+".pdb";
}

//----------------------------------------------------------------------------
std::string cmTarget::GetSOName(const char* config)
{
  if(this->IsImported())
    {
    // Lookup the imported soname.
    if(cmTarget::ImportInfo const* info = this->GetImportInfo(config))
      {
      return info->SOName;
      }
    else
      {
      return "";
      }
    }
  else
    {
    // Compute the soname that will be built.
    std::string name;
    std::string soName;
    std::string realName;
    std::string impName;
    std::string pdbName;
    this->GetLibraryNames(name, soName, realName, impName, pdbName, config);
    return soName;
    }
}

//----------------------------------------------------------------------------
std::string cmTarget::NormalGetRealName(const char* config)
{
  // This should not be called for imported targets.
  // TODO: Split cmTarget into a class hierarchy to get compile-time
  // enforcement of the limited imported target API.
  if(this->IsImported())
    {
    abort();
    }

  if(this->GetType() == cmTarget::EXECUTABLE)
    {
    // Compute the real name that will be built.
    std::string name;
    std::string realName;
    std::string impName;
    std::string pdbName;
    this->GetExecutableNames(name, realName, impName, pdbName, config);
    return realName;
    }
  else
    {
    // Compute the real name that will be built.
    std::string name;
    std::string soName;
    std::string realName;
    std::string impName;
    std::string pdbName;
    this->GetLibraryNames(name, soName, realName, impName, pdbName, config);
    return realName;
    }
}

//----------------------------------------------------------------------------
std::string cmTarget::GetFullName(const char* config, bool implib)
{
  if(this->IsImported())
    {
    return this->GetFullNameImported(config, implib);
    }
  else
    {
    return this->GetFullNameInternal(this->GetType(), config, implib);
    }
}

//----------------------------------------------------------------------------
std::string cmTarget::GetFullNameImported(const char* config, bool implib)
{
  return cmSystemTools::GetFilenameName(
    this->ImportedGetFullPath(config, implib));
}

//----------------------------------------------------------------------------
void cmTarget::GetFullNameComponents(std::string& prefix, std::string& base,
                                     std::string& suffix, const char* config,
                                     bool implib)
{
  this->GetFullNameInternal(this->GetType(), config, implib,
                            prefix, base, suffix);
}

//----------------------------------------------------------------------------
std::string cmTarget::GetFullPath(const char* config, bool implib,
                                  bool realname)
{
  if(this->IsImported())
    {
    return this->ImportedGetFullPath(config, implib);
    }
  else
    {
    return this->NormalGetFullPath(config, implib, realname);
    }
}

//----------------------------------------------------------------------------
std::string cmTarget::NormalGetFullPath(const char* config, bool implib,
                                        bool realname)
{
  // Start with the output directory for the target.
  std::string fpath = this->GetDirectory(config, implib);
  fpath += "/";

  // Add the full name of the target.
  if(implib)
    {
    fpath += this->GetFullName(config, true);
    }
  else if(realname)
    {
    fpath += this->NormalGetRealName(config);
    }
  else
    {
    fpath += this->GetFullName(config, false);
    }
  return fpath;
}

//----------------------------------------------------------------------------
std::string cmTarget::ImportedGetFullPath(const char* config, bool implib)
{
  if(cmTarget::ImportInfo const* info = this->GetImportInfo(config))
    {
    if(implib)
      {
      return info->ImportLibrary;
      }
    else
      {
      return info->Location;
      }
    }
  else
    {
    std::string result = this->GetName();
    result += "-NOTFOUND";
    return result;
    }
}

//----------------------------------------------------------------------------
std::string
cmTarget::GetFullNameInternal(TargetType type, const char* config,
                              bool implib)
{
  std::string prefix;
  std::string base;
  std::string suffix;
  this->GetFullNameInternal(type, config, implib, prefix, base, suffix);
  return prefix+base+suffix;
}

//----------------------------------------------------------------------------
void cmTarget::GetFullNameInternal(TargetType type,
                                   const char* config,
                                   bool implib,
                                   std::string& outPrefix,
                                   std::string& outBase,
                                   std::string& outSuffix)
{
  // Use just the target name for non-main target types.
  if(type != cmTarget::STATIC_LIBRARY &&
     type != cmTarget::SHARED_LIBRARY &&
     type != cmTarget::MODULE_LIBRARY &&
     type != cmTarget::EXECUTABLE)
    {
    outPrefix = "";
    outBase = this->GetName();
    outSuffix = "";
    return;
    }

  // Return an empty name for the import library if this platform
  // does not support import libraries.
  if(implib &&
     !this->Makefile->GetDefinition("CMAKE_IMPORT_LIBRARY_SUFFIX"))
    {
    outPrefix = "";
    outBase = "";
    outSuffix = "";
    return;
    }

  // The implib option is only allowed for shared libraries, module
  // libraries, and executables.
  if(type != cmTarget::SHARED_LIBRARY &&
     type != cmTarget::MODULE_LIBRARY &&
     type != cmTarget::EXECUTABLE)
    {
    implib = false;
    }

  // Compute the full name for main target types.
  const char* targetPrefix = (implib
                              ? this->GetProperty("IMPORT_PREFIX")
                              : this->GetProperty("PREFIX"));
  const char* targetSuffix = (implib
                              ? this->GetProperty("IMPORT_SUFFIX")
                              : this->GetProperty("SUFFIX"));
  const char* configPostfix = 0;
  if(config && *config)
    {
    std::string configProp = cmSystemTools::UpperCase(config);
    configProp += "_POSTFIX";
    configPostfix = this->GetProperty(configProp.c_str());
    }
  const char* prefixVar = this->GetPrefixVariableInternal(type, implib);
  const char* suffixVar = this->GetSuffixVariableInternal(type, implib);
  const char* ll =
    this->GetLinkerLanguage(
      this->Makefile->GetLocalGenerator()->GetGlobalGenerator());
  // first try language specific suffix
  if(ll)
    {
    if(!targetSuffix && suffixVar && *suffixVar)
      {
      std::string langSuff = suffixVar + std::string("_") + ll;
      targetSuffix = this->Makefile->GetDefinition(langSuff.c_str());
      }
    if(!targetPrefix && prefixVar && *prefixVar)
      {
      std::string langPrefix = prefixVar + std::string("_") + ll;
      targetPrefix = this->Makefile->GetDefinition(langPrefix.c_str());
      }
    }

  // if there is no prefix on the target use the cmake definition
  if(!targetPrefix && prefixVar)
    {
    targetPrefix = this->Makefile->GetSafeDefinition(prefixVar);
    }
  // if there is no suffix on the target use the cmake definition
  if(!targetSuffix && suffixVar)
    {
    targetSuffix = this->Makefile->GetSafeDefinition(suffixVar);
    }

  // frameworks do not have a prefix or a suffix
  if(this->IsFrameworkOnApple())
    {
    targetPrefix = 0;
    targetSuffix = 0;
    }

  // Begin the final name with the prefix.
  outPrefix = targetPrefix?targetPrefix:"";

  // Append the target name or property-specified name.
  const char* outName = 0;
  if(config && *config)
    {
    std::string configProp = cmSystemTools::UpperCase(config);
    configProp += "_OUTPUT_NAME";
    outName = this->GetProperty(configProp.c_str());
    }
  if(!outName)
    {
    outName = this->GetProperty("OUTPUT_NAME");
    }
  if(outName)
    {
    outBase = outName;
    }
  else
    {
    outBase = this->GetName();
    }

  // Append the per-configuration postfix.
  outBase += configPostfix?configPostfix:"";

  // Name shared libraries with their version number on some platforms.
  if(const char* version = this->GetProperty("VERSION"))
    {
    if(type == cmTarget::SHARED_LIBRARY && !implib &&
       this->Makefile->IsOn("CMAKE_SHARED_LIBRARY_NAME_WITH_VERSION"))
      {
      outBase += "-";
      outBase += version;
      }
    }

  // Append the suffix.
  outSuffix = targetSuffix?targetSuffix:"";
}

//----------------------------------------------------------------------------
void cmTarget::GetLibraryNames(std::string& name,
                               std::string& soName,
                               std::string& realName,
                               std::string& impName,
                               std::string& pdbName,
                               const char* config)
{
  // Get the names based on the real type of the library.
  this->GetLibraryNamesInternal(name, soName, realName, impName, pdbName,
                                this->GetType(), config);
}

//----------------------------------------------------------------------------
void cmTarget::GetLibraryCleanNames(std::string& staticName,
                                    std::string& sharedName,
                                    std::string& sharedSOName,
                                    std::string& sharedRealName,
                                    std::string& importName,
                                    std::string& pdbName,
                                    const char* config)
{
  // Get the name as if this were a static library.
  std::string soName;
  std::string realName;
  std::string impName;
  this->GetLibraryNamesInternal(staticName, soName, realName, impName,
                                pdbName, cmTarget::STATIC_LIBRARY, config);

  // Get the names as if this were a shared library.
  if(this->GetType() == cmTarget::STATIC_LIBRARY)
    {
    // Since the real type is static then the user either specified
    // STATIC or did not specify a type.  In the former case the
    // shared library will never be present.  In the latter case the
    // type will never be MODULE.  Either way the only names that
    // might have to be cleaned are the shared library names.
    this->GetLibraryNamesInternal(sharedName, sharedSOName, sharedRealName,
                                  importName, pdbName,
                                  cmTarget::SHARED_LIBRARY, config);
    }
  else
    {
    // Use the name of the real type of the library (shared or module).
    this->GetLibraryNamesInternal(sharedName, sharedSOName, sharedRealName,
                                  importName, pdbName, this->GetType(),
                                  config);
    }
}

//----------------------------------------------------------------------------
void cmTarget::GetLibraryNamesInternal(std::string& name,
                                       std::string& soName,
                                       std::string& realName,
                                       std::string& impName,
                                       std::string& pdbName,
                                       TargetType type,
                                       const char* config)
{
  // This should not be called for imported targets.
  // TODO: Split cmTarget into a class hierarchy to get compile-time
  // enforcement of the limited imported target API.
  if(this->IsImported())
    {
    abort();
    }

  // Construct the name of the soname flag variable for this language.
  const char* ll =
    this->GetLinkerLanguage(
      this->Makefile->GetLocalGenerator()->GetGlobalGenerator());
  std::string sonameFlag = "CMAKE_SHARED_LIBRARY_SONAME";
  if(ll)
    {
    sonameFlag += "_";
    sonameFlag += ll;
    }
  sonameFlag += "_FLAG";

  // Check for library version properties.
  const char* version = this->GetProperty("VERSION");
  const char* soversion = this->GetProperty("SOVERSION");
  if((type != cmTarget::SHARED_LIBRARY && type != cmTarget::MODULE_LIBRARY) ||
     !this->Makefile->GetDefinition(sonameFlag.c_str()))
    {
    // Versioning is supported only for shared libraries and modules,
    // and then only when the platform supports an soname flag.
    version = 0;
    soversion = 0;
    }
  if(version && !soversion)
    {
    // The soversion must be set if the library version is set.  Use
    // the library version as the soversion.
    soversion = version;
    }

  // Get the components of the library name.
  std::string prefix;
  std::string base;
  std::string suffix;
  this->GetFullNameInternal(type, config, false, prefix, base, suffix);

  // The library name.
  name = prefix+base+suffix;

  // The library's soname.
#if defined(__APPLE__)
  soName = prefix+base;
#else
  soName = name;
#endif
  if(soversion)
    {
    soName += ".";
    soName += soversion;
    }
#if defined(__APPLE__)
  soName += suffix;
#endif

  // The library's real name on disk.
#if defined(__APPLE__)
  realName = prefix+base;
#else
  realName = name;
#endif
  if(version)
    {
    realName += ".";
    realName += version;
    }
  else if(soversion)
    {
    realName += ".";
    realName += soversion;
    }
#if defined(__APPLE__)
  realName += suffix;
#endif

  // The import library name.
  if(type == cmTarget::SHARED_LIBRARY ||
     type == cmTarget::MODULE_LIBRARY)
    {
    impName = this->GetFullNameInternal(type, config, true);
    }
  else
    {
    impName = "";
    }

  // The program database file name.
  pdbName = prefix+base+".pdb";
}

//----------------------------------------------------------------------------
void cmTarget::GetExecutableNames(std::string& name,
                                  std::string& realName,
                                  std::string& impName,
                                  std::string& pdbName,
                                  const char* config)
{
  // Get the names based on the real type of the executable.
  this->GetExecutableNamesInternal(name, realName, impName, pdbName,
                                   this->GetType(), config);
}

//----------------------------------------------------------------------------
void cmTarget::GetExecutableCleanNames(std::string& name,
                                       std::string& realName,
                                       std::string& impName,
                                       std::string& pdbName,
                                       const char* config)
{
  // Get the name and versioned name of this executable.
  this->GetExecutableNamesInternal(name, realName, impName, pdbName,
                                   cmTarget::EXECUTABLE, config);
}

//----------------------------------------------------------------------------
void cmTarget::GetExecutableNamesInternal(std::string& name,
                                          std::string& realName,
                                          std::string& impName,
                                          std::string& pdbName,
                                          TargetType type,
                                          const char* config)
{
  // This should not be called for imported targets.
  // TODO: Split cmTarget into a class hierarchy to get compile-time
  // enforcement of the limited imported target API.
  if(this->IsImported())
    {
    abort();
    }

  // This versioning is supported only for executables and then only
  // when the platform supports symbolic links.
#if defined(_WIN32) && !defined(__CYGWIN__)
  const char* version = 0;
#else
  // Check for executable version properties.
  const char* version = this->GetProperty("VERSION");
  if(type != cmTarget::EXECUTABLE || this->Makefile->IsOn("XCODE"))
    {
    version = 0;
    }
#endif

  // Get the components of the executable name.
  std::string prefix;
  std::string base;
  std::string suffix;
  this->GetFullNameInternal(type, config, false, prefix, base, suffix);

  // The executable name.
  name = prefix+base+suffix;

  // The executable's real name on disk.
#if defined(__CYGWIN__)
  realName = prefix+base;
#else
  realName = name;
#endif
  if(version)
    {
    realName += "-";
    realName += version;
    }
#if defined(__CYGWIN__)
  realName += suffix;
#endif

  // The import library name.
  impName = this->GetFullNameInternal(type, config, true);

  // The program database file name.
  pdbName = prefix+base+".pdb";
}

//----------------------------------------------------------------------------
void cmTarget::GenerateTargetManifest(const char* config)
{
  cmMakefile* mf = this->Makefile;
  cmLocalGenerator* lg = mf->GetLocalGenerator();
  cmGlobalGenerator* gg = lg->GetGlobalGenerator();

  // Get the names.
  std::string name;
  std::string soName;
  std::string realName;
  std::string impName;
  std::string pdbName;
  if(this->GetType() == cmTarget::EXECUTABLE)
    {
    this->GetExecutableNames(name, realName, impName, pdbName, config);
    }
  else if(this->GetType() == cmTarget::STATIC_LIBRARY ||
          this->GetType() == cmTarget::SHARED_LIBRARY ||
          this->GetType() == cmTarget::MODULE_LIBRARY)
    {
    this->GetLibraryNames(name, soName, realName, impName, pdbName, config);
    }
  else
    {
    return;
    }

  // Get the directory.
  std::string dir = this->GetDirectory(config, false);

  // Add each name.
  std::string f;
  if(!name.empty())
    {
    f = dir;
    f += "/";
    f += name;
    gg->AddToManifest(config? config:"", f);
    }
  if(!soName.empty())
    {
    f = dir;
    f += "/";
    f += soName;
    gg->AddToManifest(config? config:"", f);
    }
  if(!realName.empty())
    {
    f = dir;
    f += "/";
    f += realName;
    gg->AddToManifest(config? config:"", f);
    }
  if(!pdbName.empty())
    {
    f = dir;
    f += "/";
    f += pdbName;
    gg->AddToManifest(config? config:"", f);
    }
  if(!impName.empty())
    {
    f = this->GetDirectory(config, true);
    f += "/";
    f += impName;
    gg->AddToManifest(config? config:"", f);
    }
}

//----------------------------------------------------------------------------
void cmTarget::SetPropertyDefault(const char* property,
                                  const char* default_value)
{
  // Compute the name of the variable holding the default value.
  std::string var = "CMAKE_";
  var += property;

  if(const char* value = this->Makefile->GetDefinition(var.c_str()))
    {
    this->SetProperty(property, value);
    }
  else if(default_value)
    {
    this->SetProperty(property, default_value);
    }
}

//----------------------------------------------------------------------------
bool cmTarget::HaveBuildTreeRPATH()
{
  return (!this->GetPropertyAsBool("SKIP_BUILD_RPATH") &&
          !this->LinkLibraries.empty());
}

//----------------------------------------------------------------------------
bool cmTarget::HaveInstallTreeRPATH()
{
  const char* install_rpath = this->GetProperty("INSTALL_RPATH");
  return install_rpath && *install_rpath;
}

//----------------------------------------------------------------------------
bool cmTarget::NeedRelinkBeforeInstall()
{
  // Only executables and shared libraries can have an rpath and may
  // need relinking.
  if(this->TargetTypeValue != cmTarget::EXECUTABLE &&
     this->TargetTypeValue != cmTarget::SHARED_LIBRARY &&
     this->TargetTypeValue != cmTarget::MODULE_LIBRARY)
    {
    return false;
    }

  // If there is no install location this target will not be installed
  // and therefore does not need relinking.
  if(!this->GetHaveInstallRule())
    {
    return false;
    }

  // If skipping all rpaths completely then no relinking is needed.
  if(this->Makefile->IsOn("CMAKE_SKIP_RPATH"))
    {
    return false;
    }

  // If building with the install-tree rpath no relinking is needed.
  if(this->GetPropertyAsBool("BUILD_WITH_INSTALL_RPATH"))
    {
    return false;
    }

  // If chrpath is going to be used no relinking is needed.
  if(this->IsChrpathUsed())
    {
    return false;
    }

  // Check for rpath support on this platform.
  if(const char* ll = this->GetLinkerLanguage(
       this->Makefile->GetLocalGenerator()->GetGlobalGenerator()))
    {
    std::string flagVar = "CMAKE_SHARED_LIBRARY_RUNTIME_";
    flagVar += ll;
    flagVar += "_FLAG";
    if(!this->Makefile->IsSet(flagVar.c_str()))
      {
      // There is no rpath support on this platform so nothing needs
      // relinking.
      return false;
      }
    }
  else
    {
    // No linker language is known.  This error will be reported by
    // other code.
    return false;
    }

  // If either a build or install tree rpath is set then the rpath
  // will likely change between the build tree and install tree and
  // this target must be relinked.
  return this->HaveBuildTreeRPATH() || this->HaveInstallTreeRPATH();
}

//----------------------------------------------------------------------------
std::string cmTarget::GetInstallNameDirForBuildTree(const char* config)
{
  // If building directly for installation then the build tree install_name
  // is the same as the install tree.
  if(this->GetPropertyAsBool("BUILD_WITH_INSTALL_RPATH"))
    {
    return GetInstallNameDirForInstallTree(config);
    }

  // Use the build tree directory for the target.
  if(this->Makefile->IsOn("CMAKE_PLATFORM_HAS_INSTALLNAME") &&
     !this->Makefile->IsOn("CMAKE_SKIP_RPATH") &&
     !this->GetPropertyAsBool("SKIP_BUILD_RPATH"))
    {
    std::string dir = this->GetDirectory(config);
    dir += "/";
    return dir;
    }
  else
    {
    return "";
    }
}

//----------------------------------------------------------------------------
std::string cmTarget::GetInstallNameDirForInstallTree(const char*)
{
  // Lookup the target property.
  const char* install_name_dir = this->GetProperty("INSTALL_NAME_DIR");
  if(this->Makefile->IsOn("CMAKE_PLATFORM_HAS_INSTALLNAME") &&
     !this->Makefile->IsOn("CMAKE_SKIP_RPATH") &&
     install_name_dir && *install_name_dir)
    {
    std::string dir = install_name_dir;
    dir += "/";
    return dir;
    }
  else
    {
    return "";
    }
}

//----------------------------------------------------------------------------
const char* cmTarget::GetAndCreateOutputDir(bool implib, bool create)
{
  // The implib option is only allowed for shared libraries, module
  // libraries, and executables.
  if(this->GetType() != cmTarget::SHARED_LIBRARY &&
     this->GetType() != cmTarget::MODULE_LIBRARY &&
     this->GetType() != cmTarget::EXECUTABLE)
    {
    implib = false;
    }

  // Sanity check.  Only generators on platforms supporting import
  // libraries should be asking for the import library output
  // directory.
  if(implib &&
     !this->Makefile->GetDefinition("CMAKE_IMPORT_LIBRARY_SUFFIX"))
    {
    abort();
    }
  if(implib && !this->DLLPlatform)
    {
    abort();
    }

  // Select whether we are constructing the directory for the main
  // target or the import library.
  std::string& out = implib? this->OutputDirImplib : this->OutputDir;

  if(out.empty())
    {
    // Look for a target property defining the target output directory
    // based on the target type.
    const char* propertyName = 0;
    switch(this->GetType())
      {
      case cmTarget::SHARED_LIBRARY:
        {
        // For non-DLL platforms shared libraries are treated as
        // library targets.  For DLL platforms the DLL part of a
        // shared library is treated as a runtime target and the
        // corresponding import library is treated as an archive
        // target.
        if(this->DLLPlatform)
          {
          if(implib)
            {
            propertyName = "ARCHIVE_OUTPUT_DIRECTORY";
            }
          else
            {
            propertyName = "RUNTIME_OUTPUT_DIRECTORY";
            }
          }
        else
          {
          propertyName = "LIBRARY_OUTPUT_DIRECTORY";
          }
        } break;
      case cmTarget::STATIC_LIBRARY:
        {
        // Static libraries are always treated as archive targets.
        propertyName = "ARCHIVE_OUTPUT_DIRECTORY";
        } break;
      case cmTarget::MODULE_LIBRARY:
        {
        // Module libraries are always treated as library targets.
        // Module import libraries are treated as archive targets.
        if(implib)
          {
          propertyName = "ARCHIVE_OUTPUT_DIRECTORY";
          }
        else
          {
          propertyName = "LIBRARY_OUTPUT_DIRECTORY";
          }
        } break;
      case cmTarget::EXECUTABLE:
        {
        // Executables are always treated as runtime targets.
        // Executable import libraries are treated as archive targets.
        if(implib)
          {
          propertyName = "ARCHIVE_OUTPUT_DIRECTORY";
          }
        else
          {
          propertyName = "RUNTIME_OUTPUT_DIRECTORY";
          }
        } break;
      default: break;
      }

    // Select an output directory.
    if(const char* outdir = this->GetProperty(propertyName))
      {
      // Use the user-specified output directory.
      out = outdir;
      }
    else if(this->GetType() == cmTarget::EXECUTABLE)
      {
      // Lookup the output path for executables.
      out = this->Makefile->GetSafeDefinition("EXECUTABLE_OUTPUT_PATH");
      }
    else if(this->GetType() == cmTarget::STATIC_LIBRARY ||
            this->GetType() == cmTarget::SHARED_LIBRARY ||
            this->GetType() == cmTarget::MODULE_LIBRARY)
      {
      // Lookup the output path for libraries.
      out = this->Makefile->GetSafeDefinition("LIBRARY_OUTPUT_PATH");
      }
    if(out.empty())
      {
      // Default to the current output directory.
      out = ".";
      }
    // Convert the output path to a full path in case it is
    // specified as a relative path.  Treat a relative path as
    // relative to the current output directory for this makefile.
    out =
      cmSystemTools::CollapseFullPath
      (out.c_str(), this->Makefile->GetStartOutputDirectory());

    if(this->IsFrameworkOnApple())
      {
      out += "/";
      out += this->GetFullName(0, implib);
      out += ".framework";
      }

    // Optionally make sure the output path exists on disk.
    if(create)
      {
      if(!cmSystemTools::MakeDirectory(out.c_str()))
        {
        cmSystemTools::Error("Error failed to create output directory: ",
                             out.c_str());
        }
      }
  }

  return out.c_str();
}

//----------------------------------------------------------------------------
const char* cmTarget::GetOutputDir(bool implib)
{
  return this->GetAndCreateOutputDir(implib, true);
}

//----------------------------------------------------------------------------
const char* cmTarget::GetExportMacro()
{
  // Define the symbol for targets that export symbols.
  if(this->GetType() == cmTarget::SHARED_LIBRARY ||
     this->GetType() == cmTarget::MODULE_LIBRARY ||
     this->IsExecutableWithExports())
    {
    if(const char* custom_export_name = this->GetProperty("DEFINE_SYMBOL"))
      {
      this->ExportMacro = custom_export_name;
      }
    else
      {
      std::string in = this->GetName();
      in += "_EXPORTS";
      this->ExportMacro = cmSystemTools::MakeCindentifier(in.c_str());
      }
    return this->ExportMacro.c_str();
    }
  else
    {
    return 0;
    }
}

//----------------------------------------------------------------------------
void cmTarget::GetLanguages(std::set<cmStdString>& languages) const
{
  for(std::vector<cmSourceFile*>::const_iterator
        i = this->SourceFiles.begin(); i != this->SourceFiles.end(); ++i)
    {
    if(const char* lang = (*i)->GetLanguage())
      {
      languages.insert(lang);
      }
    }
}

//----------------------------------------------------------------------------
bool cmTarget::IsChrpathUsed()
{
  // Enable use of "chrpath" if it is available, the user has turned
  // on the feature, and the rpath flag uses a separator.
  if(const char* ll = this->GetLinkerLanguage(
       this->Makefile->GetLocalGenerator()->GetGlobalGenerator()))
    {
    std::string sepVar = "CMAKE_SHARED_LIBRARY_RUNTIME_";
    sepVar += ll;
    sepVar += "_FLAG_SEP";
    const char* sep = this->Makefile->GetDefinition(sepVar.c_str());
    if(sep && *sep)
      {
      if(this->Makefile->IsSet("CMAKE_CHRPATH") &&
         this->Makefile->IsOn("CMAKE_USE_CHRPATH"))
        {
        return true;
        }
      }
    }
  return false;
}

//----------------------------------------------------------------------------
cmTarget::ImportInfo const*
cmTarget::GetImportInfo(const char* config)
{
  // There is no imported information for non-imported targets.
  if(!this->IsImported())
    {
    return 0;
    }

  // Lookup/compute/cache the import information for this
  // configuration.
  std::string config_upper;
  if(config && *config)
    {
    config_upper = cmSystemTools::UpperCase(config);
    }
  else
    {
    config_upper = "NOCONFIG";
    }
  ImportInfoMapType::const_iterator i =
    this->ImportInfoMap.find(config_upper);
  if(i == this->ImportInfoMap.end())
    {
    ImportInfo info;
    this->ComputeImportInfo(config_upper, info);
    ImportInfoMapType::value_type entry(config_upper, info);
    i = this->ImportInfoMap.insert(entry).first;
    }

  // If the location is empty then the target is not available for
  // this configuration.
  if(i->second.Location.empty())
    {
    return 0;
    }

  // Return the import information.
  return &i->second;
}

//----------------------------------------------------------------------------
void cmTarget::ComputeImportInfo(std::string const& desired_config,
                                 ImportInfo& info)
{
  // This method finds information about an imported target from its
  // properties.  The "IMPORTED_" namespace is reserved for properties
  // defined by the project exporting the target.

  // Track the configuration-specific property suffix.
  std::string suffix = "_";
  suffix += desired_config;

  // Look for a mapping from the current project's configuration to
  // the imported project's configuration.
  std::vector<std::string> mappedConfigs;
  {
  std::string mapProp = "MAP_IMPORTED_CONFIG_";
  mapProp += desired_config;
  if(const char* mapValue = this->GetProperty(mapProp.c_str()))
    {
    cmSystemTools::ExpandListArgument(mapValue, mappedConfigs);
    }
  }

  // If a mapping was found, check its configurations.
  const char* loc = 0;
  for(std::vector<std::string>::const_iterator mci = mappedConfigs.begin();
      !loc && mci != mappedConfigs.end(); ++mci)
    {
    // Look for this configuration.
    std::string mcUpper = cmSystemTools::UpperCase(mci->c_str());
    std::string locProp = "IMPORTED_LOCATION_";
    locProp += mcUpper;
    loc = this->GetProperty(locProp.c_str());

    // If it was found, use it for all properties below.
    if(loc)
      {
      suffix = "_";
      suffix += mcUpper;
      }
    }

  // If we needed to find one of the mapped configurations but did not
  // then the target is not found.  The project does not want any
  // other configuration.
  if(!mappedConfigs.empty() && !loc)
    {
    return;
    }

  // If we have not yet found it then there are no mapped
  // configurations.  Look for an exact-match.
  if(!loc)
    {
    std::string locProp = "IMPORTED_LOCATION";
    locProp += suffix;
    loc = this->GetProperty(locProp.c_str());
    }

  // If we have not yet found it then there are no mapped
  // configurations and no exact match.
  if(!loc)
    {
    // The suffix computed above is not useful.
    suffix = "";

    // Look for a configuration-less location.  This may be set by
    // manually-written code.
    loc = this->GetProperty("IMPORTED_LOCATION");
    }

  // If we have not yet found it then the project is willing to try
  // any available configuration.
  if(!loc)
    {
    std::vector<std::string> availableConfigs;
    if(const char* iconfigs = this->GetProperty("IMPORTED_CONFIGURATIONS"))
      {
      cmSystemTools::ExpandListArgument(iconfigs, availableConfigs);
      }
    for(std::vector<std::string>::const_iterator
          aci = availableConfigs.begin();
        !loc && aci != availableConfigs.end(); ++aci)
      {
      suffix = "_";
      suffix += cmSystemTools::UpperCase(availableConfigs[0]);
      std::string locProp = "IMPORTED_LOCATION";
      locProp += suffix;
      loc = this->GetProperty(locProp.c_str());
      }
    }

  // If we have not yet found it then the target is not available.
  if(!loc)
    {
    return;
    }

  // A provided configuration has been chosen.  Load the
  // configuration's properties.
  info.Location = loc;

  // Get the soname.
  if(this->GetType() == cmTarget::SHARED_LIBRARY)
    {
    std::string soProp = "IMPORTED_SONAME";
    soProp += suffix;
    if(const char* config_soname = this->GetProperty(soProp.c_str()))
      {
      info.SOName = config_soname;
      }
    else if(const char* soname = this->GetProperty("IMPORTED_SONAME"))
      {
      info.SOName = soname;
      }
    }

  // Get the import library.
  if(this->GetType() == cmTarget::SHARED_LIBRARY ||
     this->IsExecutableWithExports())
    {
    std::string impProp = "IMPORTED_IMPLIB";
    impProp += suffix;
    if(const char* config_implib = this->GetProperty(impProp.c_str()))
      {
      info.ImportLibrary = config_implib;
      }
    else if(const char* implib = this->GetProperty("IMPORTED_IMPLIB"))
      {
      info.ImportLibrary = implib;
      }
    }

  // Get the link interface.
  {
  std::string linkProp = "IMPORTED_LINK_INTERFACE_LIBRARIES";
  linkProp += suffix;
  if(const char* config_libs = this->GetProperty(linkProp.c_str()))
    {
    cmSystemTools::ExpandListArgument(config_libs,
                                      info.LinkInterface.Libraries);
    }
  else if(const char* libs =
          this->GetProperty("IMPORTED_LINK_INTERFACE_LIBRARIES"))
    {
    cmSystemTools::ExpandListArgument(libs,
                                      info.LinkInterface.Libraries);
    }
  }

  // Get the link dependencies.
  {
  std::string linkProp = "IMPORTED_LINK_DEPENDENT_LIBRARIES";
  linkProp += suffix;
  if(const char* config_libs = this->GetProperty(linkProp.c_str()))
    {
    cmSystemTools::ExpandListArgument(config_libs,
                                      info.LinkInterface.SharedDeps);
    }
  else if(const char* libs =
          this->GetProperty("IMPORTED_LINK_DEPENDENT_LIBRARIES"))
    {
    cmSystemTools::ExpandListArgument(libs, info.LinkInterface.SharedDeps);
    }
  }
}

//----------------------------------------------------------------------------
cmTargetLinkInterface const* cmTarget::GetLinkInterface(const char* config)
{
  // Imported targets have their own link interface.
  if(this->IsImported())
    {
    if(cmTarget::ImportInfo const* info = this->GetImportInfo(config))
      {
      return &info->LinkInterface;
      }
    return 0;
    }

  // Link interfaces are supported only for shared libraries and
  // executables that export symbols.
  if((this->GetType() != cmTarget::SHARED_LIBRARY &&
      !this->IsExecutableWithExports()))
    {
    return 0;
    }

  // Lookup any existing link interface for this configuration.
  std::map<cmStdString, cmTargetLinkInterface*>::iterator
    i = this->LinkInterface.find(config?config:"");
  if(i == this->LinkInterface.end())
    {
    // Compute the link interface for this configuration.
    cmTargetLinkInterface* interface = this->ComputeLinkInterface(config);

    // Store the information for this configuration.
    std::map<cmStdString, cmTargetLinkInterface*>::value_type
      entry(config?config:"", interface);
    i = this->LinkInterface.insert(entry).first;
    }

  return i->second;
}

//----------------------------------------------------------------------------
cmTargetLinkInterface* cmTarget::ComputeLinkInterface(const char* config)
{
  // Construct the property name suffix for this configuration.
  std::string suffix = "_";
  if(config && *config)
    {
    suffix += cmSystemTools::UpperCase(config);
    }
  else
    {
    suffix += "NOCONFIG";
    }

  // Lookup the link interface libraries.
  const char* libs = 0;
  {
  // Lookup the per-configuration property.
  std::string propName = "LINK_INTERFACE_LIBRARIES";
  propName += suffix;
  libs = this->GetProperty(propName.c_str());

  // If not set, try the generic property.
  if(!libs)
    {
    libs = this->GetProperty("LINK_INTERFACE_LIBRARIES");
    }
  }

  // If still not set, there is no link interface.
  if(!libs)
    {
    return 0;
    }

  // Allocate the interface.
  cmTargetLinkInterface* interface = new cmTargetLinkInterface;
  if(!interface)
    {
    return 0;
    }

  // Expand the list of libraries in the interface.
  cmSystemTools::ExpandListArgument(libs, interface->Libraries);

  // Now we need to construct a list of shared library dependencies
  // not included in the interface.
  if(this->GetType() == cmTarget::SHARED_LIBRARY)
    {
    // Use a set to keep track of what libraries have been emitted to
    // either list.
    std::set<cmStdString> emitted;
    for(std::vector<std::string>::const_iterator
          li = interface->Libraries.begin();
        li != interface->Libraries.end(); ++li)
      {
      emitted.insert(*li);
      }

    // Compute which library configuration to link.
    cmTarget::LinkLibraryType linkType = cmTarget::OPTIMIZED;
    if(config && cmSystemTools::UpperCase(config) == "DEBUG")
      {
      linkType = cmTarget::DEBUG;
      }

    // Construct the list of libs linked for this configuration.
    cmTarget::LinkLibraryVectorType const& llibs =
      this->GetOriginalLinkLibraries();
    for(cmTarget::LinkLibraryVectorType::const_iterator li = llibs.begin();
        li != llibs.end(); ++li)
      {
      // Skip entries that will resolve to the target itself, are empty,
      // or are not meant for this configuration.
      if(li->first == this->GetName() || li->first.empty() ||
         !(li->second == cmTarget::GENERAL || li->second == linkType))
        {
        continue;
        }

      // Skip entries that have already been emitted into either list.
      if(!emitted.insert(li->first).second)
        {
        continue;
        }

      // Add this entry if it is a shared library.
      if(cmTarget* tgt = this->Makefile->FindTargetToUse(li->first.c_str()))
        {
        if(tgt->GetType() == cmTarget::SHARED_LIBRARY)
          {
          interface->SharedDeps.push_back(li->first);
          }
        }
      else
        {
        // TODO: Recognize shared library file names.  Perhaps this
        // should be moved to cmComputeLinkInformation, but that creates
        // a chicken-and-egg problem since this list is needed for its
        // construction.
        }
      }
    }

  // Return the completed interface.
  return interface;
}

//----------------------------------------------------------------------------
cmComputeLinkInformation*
cmTarget::GetLinkInformation(const char* config)
{
  // Link information does not make sense for static libraries.
  assert(this->GetType() != cmTarget::STATIC_LIBRARY);

  // Lookup any existing information for this configuration.
  std::map<cmStdString, cmComputeLinkInformation*>::iterator
    i = this->LinkInformation.find(config?config:"");
  if(i == this->LinkInformation.end())
    {
    // Compute information for this configuration.
    cmComputeLinkInformation* info =
      new cmComputeLinkInformation(this, config);
    if(!info || !info->Compute())
      {
      delete info;
      info = 0;
      }

    // Store the information for this configuration.
    std::map<cmStdString, cmComputeLinkInformation*>::value_type
      entry(config?config:"", info);
    i = this->LinkInformation.insert(entry).first;
    }
  return i->second;
}

//----------------------------------------------------------------------------
cmTargetLinkInformationMap
::cmTargetLinkInformationMap(cmTargetLinkInformationMap const& r): derived()
{
  // Ideally cmTarget instances should never be copied.  However until
  // we can make a sweep to remove that, this copy constructor avoids
  // allowing the resources (LinkInformation) from getting copied.  In
  // the worst case this will lead to extra cmComputeLinkInformation
  // instances.  We also enforce in debug mode that the map be emptied
  // when copied.
  static_cast<void>(r);
  assert(r.empty());
}

//----------------------------------------------------------------------------
cmTargetLinkInformationMap::~cmTargetLinkInformationMap()
{
  for(derived::iterator i = this->begin(); i != this->end(); ++i)
    {
    delete i->second;
    }
}

//----------------------------------------------------------------------------
cmTargetLinkInterfaceMap
::cmTargetLinkInterfaceMap(cmTargetLinkInterfaceMap const& r): derived()
{
  // Ideally cmTarget instances should never be copied.  However until
  // we can make a sweep to remove that, this copy constructor avoids
  // allowing the resources (LinkInterface) from getting copied.  In
  // the worst case this will lead to extra cmTargetLinkInterface
  // instances.  We also enforce in debug mode that the map be emptied
  // when copied.
  static_cast<void>(r);
  assert(r.empty());
}

//----------------------------------------------------------------------------
cmTargetLinkInterfaceMap::~cmTargetLinkInterfaceMap()
{
  for(derived::iterator i = this->begin(); i != this->end(); ++i)
    {
    delete i->second;
    }
}