cmGlobalGenerator: Finish storing enabled languages in cmState

In commit 74de9a73 (cmGlobalGenerator: Delegate storage of enabled
languages to cmState, 2015-04-11) the original LanguageEnabled
member of cmGlobalGenerator was left behind by mistake.  One use
of it in EnableLanguagesFromGenerator (for try_compile) was left,
but the member is not populated anymore.  Drop the member and
teach EnableLanguagesFromGenerator to copy the list of enabled
languages from one cmState to the other.

Reported-by: Matt McCormick <[email protected]>

Source/cmGlobalGenerator.cxx

@@ -1896,7 +1896,9 @@ void cmGlobalGenerator::EnableLanguagesFromGenerator(cmGlobalGenerator *gen,
                                           "make program",
                                           cmState::FILEPATH);
   // copy the enabled languages
-  this->LanguageEnabled = gen->LanguageEnabled;
+  this->GetCMakeInstance()->GetState()->SetEnabledLanguages(
+    gen->GetCMakeInstance()->GetState()->GetEnabledLanguages()
+    );
   this->LanguagesReady = gen->LanguagesReady;
   this->ExtensionToLanguage = gen->ExtensionToLanguage;
   this->IgnoreExtensions = gen->IgnoreExtensions;

Source/cmGlobalGenerator.h

@@ -441,7 +441,6 @@ private:
   // If you add a new map here, make sure it is copied
   // in EnableLanguagesFromGenerator
   std::map<std::string, bool> IgnoreExtensions;
-  std::vector<std::string> LanguageEnabled;
   std::set<std::string> LanguagesReady; // Ready for try_compile
   std::map<std::string, std::string> OutputExtensions;
   std::map<std::string, std::string> LanguageToOutputExtension;

Source/cmState.cxx

@@ -272,6 +272,11 @@ std::vector<std::string> cmState::GetEnabledLanguages() const
   return this->EnabledLanguages;
 }
 
+void cmState::SetEnabledLanguages(std::vector<std::string> const& langs)
+{
+  this->EnabledLanguages = langs;
+}
+
 void cmState::ClearEnabledLanguages()
 {
   this->EnabledLanguages.clear();

Source/cmState.h

@@ -77,6 +77,7 @@ public:
   void SetLanguageEnabled(std::string const& l);
   bool GetLanguageEnabled(std::string const& l) const;
   std::vector<std::string> GetEnabledLanguages() const;
+  void SetEnabledLanguages(std::vector<std::string> const& langs);
   void ClearEnabledLanguages();
 
   bool GetIsInTryCompile() const;