VS: Delay platform definitions until system name is known

Move the definition of CMAKE_VS_PLATFORM_NAME and other variables that
are not needed by CMakeDetermineSystem out of the AddPlatformDefinitions
method and into a SetSystemName method.  The latter may later use
CMAKE_SYSTEM_NAME to decide what platform-specific definitions to add.

Source/cmGlobalVisualStudio10Generator.cxx

@@ -125,10 +125,11 @@ cmGlobalVisualStudio10Generator::SetGeneratorToolset(std::string const& ts,
 }
 
 //----------------------------------------------------------------------------
-void cmGlobalVisualStudio10Generator::AddPlatformDefinitions(cmMakefile* mf)
+bool cmGlobalVisualStudio10Generator::SetSystemName(std::string const& s,
+                                                    cmMakefile* mf)
 {
-  cmGlobalVisualStudio8Generator::AddPlatformDefinitions(mf);
   this->AddVSPlatformToolsetDefinition(mf);
+  return this->cmGlobalVisualStudio8Generator::SetSystemName(s, mf);
 }
 
 //----------------------------------------------------------------------------

Source/cmGlobalVisualStudio10Generator.h

@@ -31,6 +31,7 @@ public:
   virtual bool MatchesGeneratorName(const std::string& name) const;
 
   virtual bool SetGeneratorToolset(std::string const& ts, cmMakefile* mf);
+  virtual bool SetSystemName(std::string const& s, cmMakefile* mf);
 
   virtual void GenerateBuildCommand(
     std::vector<std::string>& makeCommand,
@@ -43,8 +44,6 @@ public:
     std::vector<std::string> const& makeOptions = std::vector<std::string>()
     );
 
-  virtual void AddPlatformDefinitions(cmMakefile* mf);
-
   ///! create the correct local generator
   virtual cmLocalGenerator *CreateLocalGenerator();
 

Source/cmGlobalVisualStudio7Generator.cxx

@@ -80,7 +80,6 @@ void cmGlobalVisualStudio7Generator
 {
   mf->AddDefinition("CMAKE_GENERATOR_RC", "rc");
   mf->AddDefinition("CMAKE_GENERATOR_NO_COMPILER_ENV", "1");
-  this->AddPlatformDefinitions(mf);
   if(!mf->GetDefinition("CMAKE_CONFIGURATION_TYPES"))
     {
     mf->AddCacheDefinition(
@@ -260,7 +259,8 @@ cmLocalGenerator *cmGlobalVisualStudio7Generator::CreateLocalGenerator()
 }
 
 //----------------------------------------------------------------------------
-void cmGlobalVisualStudio7Generator::AddPlatformDefinitions(cmMakefile* mf)
+bool cmGlobalVisualStudio7Generator::SetSystemName(std::string const& s,
+                                                   cmMakefile* mf)
 {
   if(this->PlatformName == "x64")
     {
@@ -273,6 +273,7 @@ void cmGlobalVisualStudio7Generator::AddPlatformDefinitions(cmMakefile* mf)
   mf->AddDefinition("CMAKE_VS_PLATFORM_NAME", this->GetPlatformName().c_str());
   mf->AddDefinition("CMAKE_VS_INTEL_Fortran_PROJECT_VERSION",
                     this->GetIntelProjectVersion());
+  return this->cmGlobalVisualStudioGenerator::SetSystemName(s, mf);
 }
 
 void cmGlobalVisualStudio7Generator::GenerateConfigurations(cmMakefile* mf)

Source/cmGlobalVisualStudio7Generator.h

@@ -44,7 +44,7 @@ public:
   ///! Create a local generator appropriate to this Global Generator
   virtual cmLocalGenerator *CreateLocalGenerator();
 
-  virtual void AddPlatformDefinitions(cmMakefile* mf);
+  virtual bool SetSystemName(std::string const& s, cmMakefile* mf);
 
   /** Get the documentation entry for this generator.  */
   static void GetDocumentation(cmDocumentationEntry& entry);

Source/cmGlobalVisualStudio8Generator.cxx

@@ -133,10 +133,17 @@ cmLocalGenerator *cmGlobalVisualStudio8Generator::CreateLocalGenerator()
 }
 
 //----------------------------------------------------------------------------
-void cmGlobalVisualStudio8Generator::AddPlatformDefinitions(cmMakefile* mf)
+void cmGlobalVisualStudio8Generator
+::EnableLanguage(std::vector<std::string>const &  lang,
+                 cmMakefile *mf, bool optional)
 {
-  cmGlobalVisualStudio71Generator::AddPlatformDefinitions(mf);
+  this->AddPlatformDefinitions(mf);
+  cmGlobalVisualStudio7Generator::EnableLanguage(lang, mf, optional);
+}
 
+//----------------------------------------------------------------------------
+void cmGlobalVisualStudio8Generator::AddPlatformDefinitions(cmMakefile* mf)
+{
   if(this->TargetsWindowsCE())
   {
     mf->AddDefinition("CMAKE_VS_WINCE_VERSION",

Source/cmGlobalVisualStudio8Generator.h

@@ -36,6 +36,8 @@ public:
   ///! Create a local generator appropriate to this Global Generator
   virtual cmLocalGenerator *CreateLocalGenerator();
 
+  virtual void EnableLanguage(std::vector<std::string>const& languages,
+                              cmMakefile *, bool optional);
   virtual void AddPlatformDefinitions(cmMakefile* mf);
 
   /**