[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

3 files changed, 32 insertions, 14 deletions

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 7c363e0d9ef..00331369249 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -4862,7 +4862,8 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
 
   // Forward flags for OpenMP
   if (Args.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
-                   options::OPT_fno_openmp, false))
+                   options::OPT_fno_openmp, false)) {
+    Args.AddAllArgs(CmdArgs, options::OPT_fopenmp_version_EQ);
     switch (getOpenMPRuntime(getToolChain(), Args)) {
     case OMPRT_OMP:
     case OMPRT_IOMP5:
@@ -4885,6 +4886,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
       // semantic analysis, etc.
       break;
     }
+  }
 
   const SanitizerArgs &Sanitize = getToolChain().getSanitizerArgs();
   Sanitize.addArgs(getToolChain(), Args, CmdArgs, InputType);
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index aa1c5a04f5b..032c9c10daf 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -1960,18 +1960,23 @@ static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
   Opts.OpenMPIsDevice =
       Opts.OpenMP && Args.hasArg(options::OPT_fopenmp_is_device);
 
-  // Provide diagnostic when a given target is not expected to be an OpenMP
-  // device or host.
-  if (Opts.OpenMP && !Opts.OpenMPIsDevice) {
-    switch (T.getArch()) {
-    default:
-      break;
-    // Add unsupported host targets here:
-    case llvm::Triple::nvptx:
-    case llvm::Triple::nvptx64:
-      Diags.Report(clang::diag::err_drv_omp_host_target_not_supported)
-          << TargetOpts.Triple;
-      break;
+  if (Opts.OpenMP) {
+    if (int Version = getLastArgIntValue(Args, OPT_fopenmp_version_EQ,
+                                         Opts.OpenMP, Diags))
+      Opts.OpenMP = Version;
+    // Provide diagnostic when a given target is not expected to be an OpenMP
+    // device or host.
+    if (!Opts.OpenMPIsDevice) {
+      switch (T.getArch()) {
+      default:
+        break;
+      // Add unsupported host targets here:
+      case llvm::Triple::nvptx:
+      case llvm::Triple::nvptx64:
+        Diags.Report(clang::diag::err_drv_omp_host_target_not_supported)
+            << TargetOpts.Triple;
+        break;
+      }
     }
   }
 
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