Add CPACK_NSIS_INSTALL_ROOT for CMake's own installer (#9148)

Problem with CMake 2.8.4-rc1: when you launch the NSIS exe installer
on Windows, the default install path shown to the end user is, at first,
"\CMake 2.8".

This problem started occurring when configuring CMake itself with an
older CMake, after adding CPACK_NSIS_INSTALL_ROOT to fix issue 9148.
So... it's a regression from 2.8.3.

I forgot (again) that when you add a new CPack variable, you must
add it to CMake's CMakeCPack.cmake file or else it is empty when
configured with an older CMake. And on Windows, without a bootstrap
build available, the releases are always configured with an older
version of CMake. This may be the last time this has bitten me,
though, because it is now burned into my brain that problems with
CMake's installer itself are inevitably associated with adding new
CPack variables.

In addition to adding a definition for CPACK_NSIS_INSTALL_ROOT,
I've gone ahead and made it differ for the 32- and 64-bit builds
of CMake to give the end user the expected default value for the
Program Files folder for each one.

And, since I was adding a new 32/64 differentiator anyhow, I made
the "NSIS package name" and "installer registry key base" different
for 64-bit builds, too, by appending " (Win64)" to each one.

These address the concerns mentioned in 9148's related issue:
http://public.kitware.com/Bug/view.php?id=9094 (at least as far
as CMake's installer is concerned). 9094 could still use a good
general fix for all projects, though, and remains open for now.

CMakeCPack.cmake

@@ -24,11 +24,7 @@ IF(EXISTS "${CMAKE_ROOT}/Modules/CPack.cmake")
 
     INCLUDE(${CMake_SOURCE_DIR}/Modules/InstallRequiredSystemLibraries.cmake)
   ENDIF(EXISTS "${CMAKE_ROOT}/Modules/InstallRequiredSystemLibraries.cmake")
-  # Set the options file that needs to be included inside CMakeCPackOptions.cmake
-  SET(QT_DIALOG_CPACK_OPTIONS_FILE ${CMake_BINARY_DIR}/Source/QtDialog/QtDialogCPack.cmake)
-  CONFIGURE_FILE("${CMake_SOURCE_DIR}/CMakeCPackOptions.cmake.in"
-    "${CMake_BINARY_DIR}/CMakeCPackOptions.cmake" @ONLY)
-  SET(CPACK_PROJECT_CONFIG_FILE "${CMake_BINARY_DIR}/CMakeCPackOptions.cmake")
+
   SET(CPACK_PACKAGE_DESCRIPTION_SUMMARY "CMake is a build tool")
   SET(CPACK_PACKAGE_VENDOR "Kitware")
   SET(CPACK_PACKAGE_DESCRIPTION_FILE "${CMAKE_CURRENT_SOURCE_DIR}/Copyright.txt")
@@ -36,6 +32,25 @@ IF(EXISTS "${CMAKE_ROOT}/Modules/CPack.cmake")
   SET(CPACK_PACKAGE_VERSION "${CMake_VERSION}")
   SET(CPACK_PACKAGE_INSTALL_DIRECTORY "CMake ${CMake_VERSION_MAJOR}.${CMake_VERSION_MINOR}")
   SET(CPACK_SOURCE_PACKAGE_FILE_NAME "cmake-${CMake_VERSION}")
+
+  # Make this explicit here, rather than accepting the CPack default value,
+  # so we can refer to it:
+  SET(CPACK_PACKAGE_NAME "${CMAKE_PROJECT_NAME}")
+
+  # Installers for 32- vs. 64-bit CMake:
+  #  - Root install directory (displayed to end user at installer-run time)
+  #  - "NSIS package/display name" (text used in the installer GUI)
+  #  - Registry key used to store info about the installation
+  IF(CMAKE_CL_64)
+    SET(CPACK_NSIS_INSTALL_ROOT "$PROGRAMFILES64")
+    SET(CPACK_NSIS_PACKAGE_NAME "${CPACK_PACKAGE_INSTALL_DIRECTORY} (Win64)")
+    SET(CPACK_PACKAGE_INSTALL_REGISTRY_KEY "${CPACK_PACKAGE_NAME} ${CPACK_PACKAGE_VERSION} (Win64)")
+  ELSE()
+    SET(CPACK_NSIS_INSTALL_ROOT "$PROGRAMFILES")
+    SET(CPACK_NSIS_PACKAGE_NAME "${CPACK_PACKAGE_INSTALL_DIRECTORY}")
+    SET(CPACK_PACKAGE_INSTALL_REGISTRY_KEY "${CPACK_PACKAGE_NAME} ${CPACK_PACKAGE_VERSION}")
+  ENDIF()
+
   IF(NOT DEFINED CPACK_SYSTEM_NAME)
     # make sure package is not Cygwin-unknown, for Cygwin just
     # cygwin is good for the system name
@@ -47,11 +62,12 @@ IF(EXISTS "${CMAKE_ROOT}/Modules/CPack.cmake")
   ENDIF(NOT DEFINED CPACK_SYSTEM_NAME)
   IF(${CPACK_SYSTEM_NAME} MATCHES Windows)
     IF(CMAKE_CL_64)
-      SET(CPACK_SYSTEM_NAME win64-${CMAKE_SYSTEM_PROCESSOR})
+      SET(CPACK_SYSTEM_NAME win64-x64)
     ELSE(CMAKE_CL_64)
-      SET(CPACK_SYSTEM_NAME win32-${CMAKE_SYSTEM_PROCESSOR})
+      SET(CPACK_SYSTEM_NAME win32-x86)
     ENDIF(CMAKE_CL_64)
   ENDIF(${CPACK_SYSTEM_NAME} MATCHES Windows)
+
   IF(NOT DEFINED CPACK_PACKAGE_FILE_NAME)
     # if the CPACK_PACKAGE_FILE_NAME is not defined by the cache
     # default to source package - system, on cygwin system is not 
@@ -63,15 +79,17 @@ IF(EXISTS "${CMAKE_ROOT}/Modules/CPack.cmake")
         "${CPACK_SOURCE_PACKAGE_FILE_NAME}-${CPACK_SYSTEM_NAME}")
     ENDIF(CYGWIN)
   ENDIF(NOT DEFINED CPACK_PACKAGE_FILE_NAME)
+
   SET(CPACK_PACKAGE_CONTACT "[email protected]")
+
   IF(UNIX)
     SET(CPACK_STRIP_FILES "bin/ccmake;bin/cmake;bin/cpack;bin/ctest")
     SET(CPACK_SOURCE_STRIP_FILES "")
     SET(CPACK_PACKAGE_EXECUTABLES "ccmake" "CMake")
   ENDIF(UNIX)
-# cygwin specific packaging stuff
+
+  # cygwin specific packaging stuff
   IF(CYGWIN)
-    
     # setup the cygwin package name
     SET(CPACK_PACKAGE_NAME cmake)
     # setup the name of the package for cygwin cmake-2.4.3
@@ -93,6 +111,13 @@ IF(EXISTS "${CMAKE_ROOT}/Modules/CPack.cmake")
     # this file uses some of the package file name variables
     INCLUDE(Utilities/Release/Cygwin/CMakeLists.txt)
   ENDIF(CYGWIN)
+
+  # Set the options file that needs to be included inside CMakeCPackOptions.cmake
+  SET(QT_DIALOG_CPACK_OPTIONS_FILE ${CMake_BINARY_DIR}/Source/QtDialog/QtDialogCPack.cmake)
+  CONFIGURE_FILE("${CMake_SOURCE_DIR}/CMakeCPackOptions.cmake.in"
+    "${CMake_BINARY_DIR}/CMakeCPackOptions.cmake" @ONLY)
+  SET(CPACK_PROJECT_CONFIG_FILE "${CMake_BINARY_DIR}/CMakeCPackOptions.cmake")
+
   # include CPack model once all variables are set
   INCLUDE(CPack)
 ENDIF(EXISTS "${CMAKE_ROOT}/Modules/CPack.cmake")

CMakeCPackOptions.cmake.in

@@ -3,8 +3,10 @@
 # in this file.  
 
 if(CPACK_GENERATOR MATCHES "NSIS")
+  SET(CPACK_NSIS_INSTALL_ROOT "@CPACK_NSIS_INSTALL_ROOT@")
+
   # set the install/unistall icon used for the installer itself
-  # There is a bug in NSI that does not handle full unix paths properly. 
+  # There is a bug in NSI that does not handle full unix paths properly.
   SET(CPACK_NSIS_MUI_ICON "@CMake_SOURCE_DIR@/Utilities/Release\\CMakeLogo.ico")
   SET(CPACK_NSIS_MUI_UNIICON "@CMake_SOURCE_DIR@/Utilities/Release\\CMakeLogo.ico")
   # set the package header icon for MUI
@@ -21,11 +23,11 @@ if(CPACK_GENERATOR MATCHES "NSIS")
     "doc/cmake-@CMake_VERSION_MAJOR@.@CMake_VERSION_MINOR@/cpack.html" "CPack Help"
     "http://www.cmake.org" "CMake Web Site"
     )
-  # Use the icond from cmake-gui for add-remove programs
+  # Use the icon from cmake-gui for add-remove programs
   SET(CPACK_NSIS_INSTALLED_ICON_NAME "bin\\cmake-gui.exe")
 
-  SET(CPACK_NSIS_DISPLAY_NAME "CMake @CMake_VERSION_MAJOR@.@CMake_VERSION_MINOR@ a cross-platform, open-source build system")
-  SET(CPACK_NSIS_PACKAGE_NAME "CMake @CMake_VERSION_MAJOR@.@CMake_VERSION_MINOR@")
+  SET(CPACK_NSIS_PACKAGE_NAME "@CPACK_NSIS_PACKAGE_NAME@")
+  SET(CPACK_NSIS_DISPLAY_NAME "@CPACK_NSIS_PACKAGE_NAME@, a cross-platform, open-source build system")
   SET(CPACK_NSIS_HELP_LINK "http://www.cmake.org")
   SET(CPACK_NSIS_URL_INFO_ABOUT "http://www.kitware.com")
   SET(CPACK_NSIS_CONTACT @CPACK_PACKAGE_CONTACT@)