1 files changed, 73 insertions, 0 deletions
diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index d62fb44..124519a 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -77,6 +77,79 @@ cmGlobalGenerator::~cmGlobalGenerator()
   this->ClearExportSets();
 }
 
+void cmGlobalGenerator::ResolveLanguageCompiler(const std::string &lang,
+                                                cmMakefile *mf,
+                                                bool optional) {
+  std::string langComp = "CMAKE_";
+  langComp += lang;
+  langComp += "_COMPILER";
+
+  if(!mf->GetDefinition(langComp.c_str()))
+    {
+    if(!optional)
+      {
+      cmSystemTools::Error(langComp.c_str(),
+                           " not set, after EnableLanguage");
+      }
+    return;
+    }
+  const char* name = mf->GetRequiredDefinition(langComp.c_str());
+  std::string path;
+  if(!cmSystemTools::FileIsFullPath(name))
+    {
+    path = cmSystemTools::FindProgram(name);
+    }
+  else
+    {
+    path = name;
+    }
+  if((path.size() == 0 || !cmSystemTools::FileExists(path.c_str()))
+      && (optional==false))
+    {
+    std::string message = "your ";
+    message += lang;
+    message += " compiler: \"";
+    message +=  name;
+    message += "\" was not found.   Please set ";
+    message += langComp;
+    message += " to a valid compiler path or name.";
+    cmSystemTools::Error(message.c_str());
+    path = name;
+    }
+  std::string doc = lang;
+  doc += " compiler.";
+  const char* cname = this->GetCMakeInstance()->
+    GetCacheManager()->GetCacheValue(langComp.c_str());
+  std::string changeVars;
+  if(cname && (path != cname) && (optional==false))
+    {
+    std::string cnameString = cname;
+    std::string pathString = path;
+    // get rid of potentially multiple slashes:
+    cmSystemTools::ConvertToUnixSlashes(cnameString);
+    cmSystemTools::ConvertToUnixSlashes(pathString);
+    if (cnameString != pathString)
+      {
+      const char* cvars =
+        this->GetCMakeInstance()->GetProperty(
+          "__CMAKE_DELETE_CACHE_CHANGE_VARS_");
+      if(cvars)
+        {
+        changeVars += cvars;
+        changeVars += ";";
+        }
+      changeVars += langComp;
+      changeVars += ";";
+      changeVars += cname;
+      this->GetCMakeInstance()->SetProperty(
+        "__CMAKE_DELETE_CACHE_CHANGE_VARS_",
+        changeVars.c_str());
+      }
+    }
+  mf->AddCacheDefinition(langComp.c_str(), path.c_str(),
+                         doc.c_str(), cmCacheManager::FILEPATH);
+}
+
 // Find the make program for the generator, required for try compiles
 void cmGlobalGenerator::FindMakeProgram(cmMakefile* mf)
 {