[OPENMP] Add option '-fopenmp-version=[31|40|45]' allowing choosing

OpenMP version.

If '-fopenmp' option is provided '-fopenmp-version=' allows to control,
which version of OpenMP must be supported. Currently it affects only the
value of _OPENMP define.

llvm-svn: 270838

1 files changed, 12 insertions, 1 deletions

diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp
index 9259b1291fe..2ebf9668796 100644
--- a/clang/lib/Frontend/InitPreprocessor.cpp
+++ b/clang/lib/Frontend/InitPreprocessor.cpp
@@ -928,7 +928,18 @@ static void InitializePredefinedMacros(const TargetInfo &TI,
     //   macro name is defined to have the decimal value yyyymm where
     //   yyyy and mm are the year and the month designations of the
     //   version of the OpenMP API that the implementation support.
-    Builder.defineMacro("_OPENMP", "201511");
+    switch (LangOpts.OpenMP) {
+    case 40:
+      Builder.defineMacro("_OPENMP", "201307");
+      break;
+    case 45:
+      Builder.defineMacro("_OPENMP", "201511");
+      break;
+    default:
+      // Default version is OpenMP 3.1
+      Builder.defineMacro("_OPENMP", "201107");
+      break;
+    }
   }
 
   // CUDA device path compilaton