Fix Windows-cl.cmake so that at most one MSVC** variable is defined.

The expectation of users of the MSVC60, MSVC70, MSVC71, MSVC80, MSVC90
and the new MSVC10 variables is that at most one of them will be set
for any given build tree. This change enforces that expectation for
build trees using Makefile generators. It also fixes the one mismatch
in that expectation to be found in the Visual Studio generator world:
previously, the VS 7.1 generator would set *both* MSVC70 and MSVC71;
now, it only sets MSVC71.

With these changes, user expectations are now met, and the recently
introduced CheckCompilerRelatedVariables test should pass everywhere.

Modules/Platform/Windows-cl.cmake

@@ -23,19 +23,15 @@ ENDIF(NOT CMAKE_NO_BUILD_TYPE AND CMAKE_GENERATOR MATCHES "Visual Studio")
 IF(CMAKE_GENERATOR MATCHES  "Visual Studio 8")
   SET(CMAKE_COMPILER_2005 1)
 ENDIF(CMAKE_GENERATOR MATCHES  "Visual Studio 8")
-IF(CMAKE_GENERATOR MATCHES  "Visual Studio 9")
-  SET(CMAKE_COMPILER_2005 1)
-ENDIF(CMAKE_GENERATOR MATCHES  "Visual Studio 9")
-
 
 # make sure to enable languages after setting configuration types
 ENABLE_LANGUAGE(RC)
 SET(CMAKE_COMPILE_RESOURCE "rc <FLAGS> /fo<OBJECT> <SOURCE>")
 
-# for nmake we need to compute some information about the compiler 
+# for nmake we need to compute some information about the compiler
 # that is being used.
 # the compiler may be free command line, 6, 7, or 71, and
-# each have properties that must be determined.  
+# each have properties that must be determined.
 # to avoid running these tests with each cmake run, the
 # test results are saved in CMakeCPlatform.cmake, a file
 # that is automatically copied into try_compile directories
@@ -87,25 +83,12 @@ IF(CMAKE_GENERATOR MATCHES "Makefiles")
         SET(MSVC80 1)
         SET(CMAKE_COMPILER_2005 1)
       ENDIF("${compilerVersion}" EQUAL 1400)
-      IF("${compilerVersion}" GREATER 1400)
-        SET(MSVC80 1)
-        SET(CMAKE_COMPILER_2005 1)
-      ENDIF("${compilerVersion}" GREATER 1400)
-      IF("${compilerVersion}" GREATER 1400)
-        SET(MSVC80 1)
-        SET(CMAKE_COMPILER_2005 1)
-      ENDIF("${compilerVersion}" GREATER 1400)
       IF("${compilerVersion}" EQUAL 1500)
         SET(MSVC90 1)
-        SET(MSVC80 0)
       ENDIF("${compilerVersion}" EQUAL 1500)
-      IF("${compilerVersion}" GREATER 1500)
-        SET(MSVC90 1)
-        SET(MSVC80 0)
-      ENDIF("${compilerVersion}" GREATER 1500)
       IF("${compilerVersion}" EQUAL 1600)
         SET(MSVC10 1)
-      ENDIF()
+      ENDIF("${compilerVersion}" EQUAL 1600)
       SET(MSVC_VERSION "${compilerVersion}")
     ELSE(NOT CMAKE_COMPILER_RETURN)
       MESSAGE(STATUS "Check for CL compiler version - failed")
@@ -224,7 +207,7 @@ ENDIF(NOT _MACHINE_ARCH_FLAG)
 SET (CMAKE_EXE_LINKER_FLAGS_INIT
     "${CMAKE_EXE_LINKER_FLAGS_INIT} /STACK:10000000 /machine:${_MACHINE_ARCH_FLAG}")
 
-# add /debug and /INCREMENTAL:YES to DEBUG and RELWITHDEBINFO also add pdbtyp
+# add /debug and /INCREMENTAL:YES to DEBUG and RELWITHDEBINFO also add pdbtype
 # on versions that support it
 SET( MSVC_INCREMENTAL_YES_FLAG "")
 IF(NOT MSVC_INCREMENTAL_DEFAULT)
@@ -256,7 +239,6 @@ SET (CMAKE_MODULE_LINKER_FLAGS_RELWITHDEBINFO_INIT ${CMAKE_EXE_LINKER_FLAGS_RELW
 SET (CMAKE_MODULE_LINKER_FLAGS_RELEASE_INIT ${CMAKE_EXE_LINKER_FLAGS_RELEASE_INIT})
 SET (CMAKE_MODULE_LINKER_FLAGS_MINSIZEREL_INIT ${CMAKE_EXE_LINKER_FLAGS_MINSIZEREL_INIT})
 
-
 # save computed information for this platform
 IF(NOT EXISTS "${CMAKE_PLATFORM_ROOT_BIN}/CMakeCPlatform.cmake")
   CONFIGURE_FILE(${CMAKE_ROOT}/Modules/Platform/Windows-cl.cmake.in 
@@ -267,4 +249,3 @@ IF(NOT EXISTS "${CMAKE_PLATFORM_ROOT_BIN}/CMakeCXXPlatform.cmake")
   CONFIGURE_FILE(${CMAKE_ROOT}/Modules/Platform/Windows-cl.cmake.in 
                ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeCXXPlatform.cmake IMMEDIATE)
 ENDIF(NOT EXISTS "${CMAKE_PLATFORM_ROOT_BIN}/CMakeCXXPlatform.cmake")
-

Source/cmGlobalVisualStudio71Generator.cxx

@@ -37,6 +37,7 @@ cmLocalGenerator *cmGlobalVisualStudio71Generator::CreateLocalGenerator()
 void cmGlobalVisualStudio71Generator::AddPlatformDefinitions(cmMakefile* mf)
 {
   this->cmGlobalVisualStudio7Generator::AddPlatformDefinitions(mf);
+  mf->RemoveDefinition("MSVC70");
   mf->AddDefinition("MSVC71", "1");
 }