[OPENMP]Do not use RTTI by default for NVPTX devices.

NVPTX does not support RTTI, so disable it by default.

Author: alexey-bataev

clang/lib/Driver/ToolChain.cpp

@@ -68,7 +68,8 @@ static ToolChain::RTTIMode CalculateRTTIMode(const ArgList &Args,
   }
 
   // -frtti is default, except for the PS4 CPU.
-  return (Triple.isPS4CPU()) ? ToolChain::RM_Disabled : ToolChain::RM_Enabled;
+  return (Triple.isPS4CPU() || Triple.isNVPTX()) ? ToolChain::RM_Disabled
+                                                 : ToolChain::RM_Enabled;
 }
 
 ToolChain::ToolChain(const Driver &D, const llvm::Triple &T,

clang/test/Driver/openmp-offload-gpu.cpp

@@ -0,0 +1,20 @@
+///
+/// Perform several driver tests for OpenMP offloading
+///
+
+// REQUIRES: clang-driver
+// REQUIRES: x86-registered-target
+// REQUIRES: powerpc-registered-target
+// REQUIRES: nvptx-registered-target
+
+/// ###########################################################################
+
+/// PTXAS is passed -c flag by default when offloading to an NVIDIA device using OpenMP
+/// Check that the flag is passed when -fopenmp-relocatable-target is used.
+// RUN:   %clangxx -### -fopenmp=libomp -fopenmp-targets=nvptx64-nvidia-cuda \
+// RUN:          -save-temps -no-canonical-prefixes %s -x c++ -c 2>&1 \
+// RUN:   | FileCheck -check-prefix=CHK-RTTI %s
+
+// CHK-RTTI: clang{{.*}}" "-triple" "nvptx64-nvidia-cuda"
+// CHK-RTTI-SAME: "-fno-rtti"
+