allow flags to be in the CC and CXX environment variables

Modules/CMakeDetermineCCompiler.cmake

@@ -8,12 +8,11 @@
 IF(NOT CMAKE_C_COMPILER)
   # if the user has specified CC via the environment, then use that without checking
   IF($ENV{CC} MATCHES ".+")
-    SET(CMAKE_C_COMPILER_INIT $ENV{CC})
-    # make sure we can find it
-    FIND_PROGRAM(CMAKE_C_COMPILER_FULLPATH NAMES $ENV{CC})
-    IF(NOT CMAKE_C_COMPILER_FULLPATH)
-      MESSAGE(SEND_ERROR "Could not find compiler set in environment variable CC:\n$ENV{CC}, make sure CC does not have flags in it, use CFLAGS instead.") 
-    ENDIF(NOT CMAKE_C_COMPILER_FULLPATH)
+    GET_FILENAME_COMPONENT(CMAKE_C_COMPILER_INIT $ENV{CC} PROGRAM PROGRAM_ARGS CMAKE_C_FLAGS_ENV_INIT)
+    IF(EXISTS ${CMAKE_C_COMPILER_INIT})
+    ELSE(EXISTS ${CMAKE_C_COMPILER_INIT})
+      MESSAGE(SEND_ERROR "Could not find compiler set in environment variable CC:\n$ENV{CC}.") 
+    ENDIF(EXISTS ${CMAKE_C_COMPILER_INIT})
   ELSE($ENV{CC} MATCHES ".+")
   # if not in the envionment then search for the compiler in the path
     SET(CMAKE_C_COMPILER_LIST ${CMAKE_GENERATOR_CC} gcc cc cl bcc )  

Modules/CMakeDetermineCXXCompiler.cmake

@@ -8,12 +8,11 @@
 IF(NOT CMAKE_CXX_COMPILER)
   # if the user has specified CC via the environment, then use that without checking
   IF($ENV{CXX} MATCHES ".+")
-    SET(CMAKE_CXX_COMPILER_INIT $ENV{CXX})
-    # make sure we can find it
-    FIND_PROGRAM(CMAKE_CXX_COMPILER_FULLPATH NAMES $ENV{CXX})
-    IF(NOT CMAKE_CXX_COMPILER_FULLPATH)
-      MESSAGE(SEND_ERROR "Could not find compiler set in environment variable CXX:\n$ENV{CXX}, make sure CXX does not have flags in it, use CXXFLAGS instead.")
-    ENDIF(NOT CMAKE_CXX_COMPILER_FULLPATH)
+    GET_FILENAME_COMPONENT(CMAKE_CXX_COMPILER_INIT $ENV{CXX} PROGRAM PROGRAM_ARGS CMAKE_CXX_FLAGS_ENV_INIT)
+    IF(EXISTS ${CMAKE_CXX_COMPILER_INIT})
+    ELSE(EXISTS ${CMAKE_CXX_COMPILER_INIT})
+      MESSAGE(SEND_ERROR "Could not find compiler set in environment variable CXX:\n$ENV{CXX}.")
+    ENDIF(EXISTS ${CMAKE_CXX_COMPILER_INIT})
   ELSE($ENV{CXX} MATCHES ".+")
   # if not in the envionment then search for the compiler in the path
     SET(CMAKE_CXX_COMPILER_LIST ${CMAKE_GENERATOR_CXX} c++ g++ CC aCC cl bcc )

Modules/CMakeSystemSpecificInformation.cmake

@@ -158,7 +158,7 @@ SET (CMAKE_INSTALL_PREFIX    /usr/local CACHE PATH
 # on the initial values computed in the platform/*.cmake files
 # use _INIT variables so that this only happens the first time
 # and you can set these flags in the cmake cache
-SET (CMAKE_CXX_FLAGS "$ENV{CXXFLAGS} ${CMAKE_CXX_FLAGS_INIT}" CACHE STRING
+SET (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS_ENV_INIT} $ENV{CXXFLAGS} ${CMAKE_CXX_FLAGS_INIT}" CACHE STRING
      "Flags used by the compiler during all build types.")
 SET (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG_INIT}" CACHE STRING
      "Flags used by the compiler during debug builds.")
@@ -168,7 +168,7 @@ SET (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE_INIT}" CACHE STRING
      "Flags used by the compiler during release builds (/MD /Ob1 /Oi /Ot /Oy /Gs will produce slightly less optimized but smaller files).")
 SET (CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT}" CACHE STRING
      "Flags used by the compiler during Release with Debug Info builds.")
-SET (CMAKE_C_FLAGS " $ENV{CFLAGS} ${CMAKE_C_FLAGS_INIT}" CACHE STRING
+SET (CMAKE_C_FLAGS "${CMAKE_C_FLAGS_ENV_INIT} $ENV{CFLAGS} ${CMAKE_C_FLAGS_INIT}" CACHE STRING
      "Flags for C compiler.")
 SET (CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG_INIT}" CACHE STRING
      "Flags used by the compiler during debug builds.")

Source/cmGetFilenameComponentCommand.cxx

@@ -39,7 +39,8 @@ bool cmGetFilenameComponentCommand::InitialPass(std::vector<std::string> const&
   
   std::string result;
   std::string filename = args[1];
-
+  std::string storeArgs;
+  std::string programArgs;
   if (args[2] == "PATH")
     {
     result = cmSystemTools::GetFilenamePath(filename);
@@ -48,6 +49,21 @@ bool cmGetFilenameComponentCommand::InitialPass(std::vector<std::string> const&
     {
     result = cmSystemTools::GetFilenameName(filename);
     }
+  else if (args[2] == "PROGRAM")
+    {
+    for(int i=2; i < args.size(); ++i)
+      {
+      if(args[i] == "PROGRAM_ARGS")
+        {
+        i++;
+        if(i < args.size())
+          {
+          storeArgs = args[i];
+          }
+        }
+      }
+    cmSystemTools::SplitProgramFromArgs(filename.c_str(), result, programArgs);
+    }
   else if (args[2] == "EXT")
     {
     result = cmSystemTools::GetFilenameExtension(filename);
@@ -65,6 +81,14 @@ bool cmGetFilenameComponentCommand::InitialPass(std::vector<std::string> const&
 
   if(args.size() == 4 && args[3] == "CACHE")
     {
+    if(programArgs.size() && storeArgs.size())
+      {
+      m_Makefile->AddCacheDefinition(storeArgs.c_str(),
+                                     programArgs.c_str(),
+                                     "",
+                                     args[2] == "PATH" ? cmCacheManager::FILEPATH
+                                     : cmCacheManager::STRING);
+      }
     m_Makefile->AddCacheDefinition(args[0].c_str(),
                                    result.c_str(),
                                    "",
@@ -73,6 +97,10 @@ bool cmGetFilenameComponentCommand::InitialPass(std::vector<std::string> const&
     }
   else 
     {
+    if(programArgs.size() && storeArgs.size())
+      {
+      m_Makefile->AddDefinition(storeArgs.c_str(), programArgs.c_str());
+      }
     m_Makefile->AddDefinition(args[0].c_str(), result.c_str());
     }
 

Source/cmGetFilenameComponentCommand.h

@@ -67,14 +67,18 @@ public:
   virtual const char* GetFullDocumentation()
     {
     return
-      "GET_FILENAME_COMPONENT(VarName FileName PATH|NAME|EXT|NAME_WE [CACHE])\n"
+      "GET_FILENAME_COMPONENT(VarName FileName PATH|NAME|EXT|NAME_WE|PROGRAM [PROGRAM_ARGS ArgVarName] [CACHE])\n"
       "Set VarName to be the path (PATH), file name (NAME), file "
       "extension (EXT) or file name without extension (NAME_WE) of FileName.\n"
       "Note that the path is converted to Unix slashes format and has no "
       "trailing slashes. The longest file extension is always considered.\n"
       "Warning: as a utility command, the resulting value is not put in the "
       "cache but in the definition list, unless you add the optional CACHE "
-      "parameter.";
+      "parameter."
+      "For PROGRAM, the program in FileName will be found in the path or if it is "
+      "a full path.   If PROGRAM_ARGS is present with PROGRAM, then the arguments "
+      "are split from the program.   This is used to separate a program from its "
+      "arguments.";
     }
   
   cmTypeMacro(cmGetFilenameComponentCommand, cmCommand);

Source/cmSystemTools.cxx

@@ -2423,3 +2423,52 @@ cmSystemTools::FileFormat cmSystemTools::GetFileFormat(const char* cext)
 #endif // __APPLE__
   return cmSystemTools::UNKNOWN_FILE_FORMAT;
 }
+
+
+void cmSystemTools::SplitProgramFromArgs(const char* path, 
+                                         std::string& program, std::string& args)
+{
+  if(cmSystemTools::FileExists(path))
+    {
+    program = path;
+    args = "";
+    return;
+    }
+  std::vector<std::string> e;
+  std::string findProg = cmSystemTools::FindProgram(path, e);
+  if(findProg.size())
+    {
+    program = findProg;
+    args = "";
+    return;
+    }
+  std::string dir = path;
+  std::string::size_type spacePos = dir.rfind(' ');
+  if(spacePos == std::string::npos)
+    {
+    program = "";
+    args = "";
+    return;
+    }
+  while(spacePos != std::string::npos)
+    {
+    std::string tryProg = dir.substr(0, spacePos);
+    if(cmSystemTools::FileExists(tryProg.c_str()))
+      {
+      program = tryProg;
+      args = dir.substr(spacePos, dir.size()-spacePos);
+      return;
+      } 
+    findProg = cmSystemTools::FindProgram(tryProg.c_str(), e);
+    if(findProg.size())
+      {
+      program = findProg;
+      args = dir.substr(spacePos, dir.size()-spacePos);
+      return;
+      }
+    spacePos = dir.rfind(' ', spacePos--);
+    }
+  program = "";
+  args = "";
+}
+

Source/cmSystemTools.h

@@ -266,10 +266,15 @@ public:
 
   ///! return path of a full filename (no trailing slashes).
   static std::string GetFilenamePath(const std::string&);
+
   
   ///! return file name of a full filename (i.e. file name without path).
   static std::string GetFilenameName(const std::string&);
   
+  ///! Split a program from its arguments and handle spaces in the paths.
+  static void SplitProgramFromArgs(const char* path, 
+                                   std::string& program, std::string& args);
+  
   ///! return file extension of a full filename (dot included).
   static std::string GetFilenameExtension(const std::string&);