1 files changed, 8 insertions, 0 deletions
diff --git a/Source/cmGlobalXCodeGenerator.cxx b/Source/cmGlobalXCodeGenerator.cxx
index a5ce5d1..4d589ed 100644
--- a/Source/cmGlobalXCodeGenerator.cxx
+++ b/Source/cmGlobalXCodeGenerator.cxx
@@ -819,6 +819,14 @@ cmXCodeObject* cmGlobalXCodeGenerator::CreateXCodeSourceFile(
     default:
       break;
   }
+
+  // explicitly add the explicit language flag before any other flag
+  // this way backwards compatibility with user flags is maintained
+  if (sf->GetProperty("LANGUAGE")) {
+    this->CurrentLocalGenerator->AppendFeatureOptions(flags, lang,
+                                                      "EXPLICIT_LANGUAGE");
+  }
+
   const std::string COMPILE_FLAGS("COMPILE_FLAGS");
   if (cmProp cflags = sf->GetProperty(COMPILE_FLAGS)) {
     lg->AppendFlags(flags, genexInterpreter.Evaluate(*cflags, COMPILE_FLAGS));