BUG: Use new include dir suppresson for all gens

This fixes CMAKE_<LANG>_IMPLICIT_INCLUDE_DIRECTORIES to be used for all
generators instead of just those that construct their own compiler
command lines directly.  See issue #8598.

Source/cmLocalGenerator.cxx

@@ -1187,25 +1187,9 @@ const char* cmLocalGenerator::GetIncludeFlags(const char* lang)
     return this->LanguageToIncludeFlags[lang].c_str();
     }
 
-  // Load implicit include directories for this language.
-  std::set<cmStdString> impDirs;
-  std::string impDirVar = "CMAKE_";
-  impDirVar += lang;
-  impDirVar += "_IMPLICIT_INCLUDE_DIRECTORIES";
-  if(const char* value = this->Makefile->GetDefinition(impDirVar.c_str()))
-    {
-    std::vector<std::string> impDirVec;
-    cmSystemTools::ExpandListArgument(value, impDirVec);
-    for(std::vector<std::string>::const_iterator i = impDirVec.begin();
-        i != impDirVec.end(); ++i)
-      {
-      impDirs.insert(*i);
-      }
-    }
-
   cmOStringStream includeFlags;
   std::vector<std::string> includes;
-  this->GetIncludeDirectories(includes);
+  this->GetIncludeDirectories(includes, lang);
   std::vector<std::string>::iterator i;
 
   std::string flagVar = "CMAKE_INCLUDE_FLAG_";
@@ -1250,11 +1234,6 @@ const char* cmLocalGenerator::GetIncludeFlags(const char* lang)
 #endif
   for(i = includes.begin(); i != includes.end(); ++i)
     {
-    // Skip implicit include directories.
-    if(impDirs.find(*i) != impDirs.end())
-      {
-      continue;
-      }
 #ifdef __APPLE__
     if(cmSystemTools::IsPathToFramework(i->c_str()))
       {
@@ -1315,7 +1294,8 @@ const char* cmLocalGenerator::GetIncludeFlags(const char* lang)
 }
 
 //----------------------------------------------------------------------------
-void cmLocalGenerator::GetIncludeDirectories(std::vector<std::string>& dirs)
+void cmLocalGenerator::GetIncludeDirectories(std::vector<std::string>& dirs,
+                                             const char* lang)
 {
   // Need to decide whether to automatically include the source and
   // binary directories at the beginning of the include path.
@@ -1381,6 +1361,21 @@ void cmLocalGenerator::GetIncludeDirectories(std::vector<std::string>& dirs)
       }
     }
 
+  // Load implicit include directories for this language.
+  std::string impDirVar = "CMAKE_";
+  impDirVar += lang;
+  impDirVar += "_IMPLICIT_INCLUDE_DIRECTORIES";
+  if(const char* value = this->Makefile->GetDefinition(impDirVar.c_str()))
+    {
+    std::vector<std::string> impDirVec;
+    cmSystemTools::ExpandListArgument(value, impDirVec);
+    for(std::vector<std::string>::const_iterator i = impDirVec.begin();
+        i != impDirVec.end(); ++i)
+      {
+      emitted.insert(*i);
+      }
+    }
+
   // Get the project-specified include directories.
   std::vector<std::string>& includes = 
     this->Makefile->GetIncludeDirectories();

Source/cmLocalGenerator.h

@@ -189,7 +189,8 @@ public:
     { return true; }
 
   /** Get the include flags for the current makefile and language.  */
-  void GetIncludeDirectories(std::vector<std::string>& dirs);
+  void GetIncludeDirectories(std::vector<std::string>& dirs,
+                             const char* lang = "C");
 
   /** Compute the language used to compile the given source file.  */
   const char* GetSourceFileLanguage(const cmSourceFile& source);