r236848 - Fix for bug 23429.

[Nemanja Ivanovic]

Author: nemanjai
Date: Fri May  8 08:07:48 2015
New Revision: 236848

URL: http://llvm.org/viewvc/llvm-project?rev=236848&view=rev
Log:
Fix for bug 23429.

The macros for gcc atomic compare and swaps are defined for Power8 CPU's since
the functionality is provided in the back end.

Modified:
    cfe/trunk/lib/Basic/Targets.cpp

Modified: cfe/trunk/lib/Basic/Targets.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Basic/Targets.cpp?rev=236848&r1=236847&r2=236848&view=diff
==============================================================================
--- cfe/trunk/lib/Basic/Targets.cpp (original)
+++ cfe/trunk/lib/Basic/Targets.cpp Fri May  8 08:07:48 2015
@@ -1207,6 +1207,14 @@ void PPCTargetInfo::getTargetDefines(con
     Builder.defineMacro("__CRYPTO__");
   if (HasHTM)
     Builder.defineMacro("__HTM__");
+  if (getTriple().getArch() == llvm::Triple::ppc64le ||
+      (defs & ArchDefinePwr8)) {
+    Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_1");
+    Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2");
+    Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4");
+    if (PointerWidth == 64)
+      Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8");
+  }
 
   // FIXME: The following are not yet generated here by Clang, but are
   //        generated by GCC: