CBackend: Fix MSVC build.

This may produce warnings on MSVS, but it's better than failures.

llvm-svn: 113834

2 files changed, 8 insertions, 4 deletions

diff --git a/llvm/lib/Target/CBackend/CBackend.cpp b/llvm/lib/Target/CBackend/CBackend.cpp
index 8e84ed36667..49391c3387d 100644
--- a/llvm/lib/Target/CBackend/CBackend.cpp
+++ b/llvm/lib/Target/CBackend/CBackend.cpp
@@ -50,6 +50,10 @@
 #include "llvm/System/Host.h"
 #include "llvm/Config/config.h"
 #include <algorithm>
+// Some ms header decided to define setjmp as _setjmp, undo this for this file.
+#ifdef _MSC_VER
+#undef setjmp
+#endif
 using namespace llvm;
 
 extern "C" void LLVMInitializeCBackendTarget() {
diff --git a/llvm/utils/TableGen/IntrinsicEmitter.cpp b/llvm/utils/TableGen/IntrinsicEmitter.cpp
index abd221d1942..c2aabf7116e 100644
--- a/llvm/utils/TableGen/IntrinsicEmitter.cpp
+++ b/llvm/utils/TableGen/IntrinsicEmitter.cpp
@@ -69,15 +69,15 @@ void IntrinsicEmitter::run(raw_ostream &OS) {
 void IntrinsicEmitter::EmitPrefix(raw_ostream &OS) {
   OS << "// VisualStudio defines setjmp as _setjmp\n"
         "#if defined(_MSC_VER) && defined(setjmp)\n"
-        "#define setjmp_undefined_for_visual_studio\n"
-        "#undef setjmp\n"
+        "#  pragma push_macro(\"setjmp\")\n"
+        "#  undef setjmp\n"
         "#endif\n\n";
 }
 
 void IntrinsicEmitter::EmitSuffix(raw_ostream &OS) {
-  OS << "#if defined(_MSC_VER) && defined(setjmp_undefined_for_visual_studio)\n"
+  OS << "#if defined(_MSC_VER)\n"
         "// let's return it to _setjmp state\n"
-        "#define setjmp _setjmp\n"
+        "#  pragma pop_macro(\"setjmp\")\n"
         "#endif\n\n";
 }