[OpenMP][MLIR][Flang][bbc][Driver] Add fopenmp-version and generate corresponding MLIR attribute

This patch adds flag -fopenmp-version to the Flang frontend and bbc tool.
This flag is lowered to MLIR OpenMP flag attribute.

Differential Revision: https://reviews.llvm.org/D150354

Reviewed By: kiranchandramohan

1 files changed, 7 insertions, 1 deletions

diff --git a/flang/lib/Frontend/CompilerInvocation.cpp b/flang/lib/Frontend/CompilerInvocation.cpp
index 84478f2..1264907 100644
--- a/flang/lib/Frontend/CompilerInvocation.cpp
+++ b/flang/lib/Frontend/CompilerInvocation.cpp
@@ -720,9 +720,15 @@ static bool parseDialectArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
         Fortran::common::LanguageFeature::OpenACC);
   }
   if (args.hasArg(clang::driver::options::OPT_fopenmp)) {
+    // By default OpenMP is set to 1.1 version
+    res.getLangOpts().OpenMPVersion = 11;
     res.getFrontendOpts().features.Enable(
         Fortran::common::LanguageFeature::OpenMP);
-
+    if (int Version = getLastArgIntValue(
+            args, clang::driver::options::OPT_fopenmp_version_EQ,
+            res.getLangOpts().OpenMPVersion, diags)) {
+      res.getLangOpts().OpenMPVersion = Version;
+    }
     if (args.hasArg(clang::driver::options::OPT_fopenmp_is_device)) {
       res.getLangOpts().OpenMPIsDevice = 1;