Fix for PR3246: an empty clobber list is the empty string, not a null

string.

That said, we should probably try and track down the correct clobber 
lists for the targets that don't have them (PPC, ARM, and Sparc), 
so that we can generate correct code.

llvm-svn: 61298

1 files changed, 3 insertions, 2 deletions

diff --git a/clang/lib/CodeGen/CGStmt.cpp b/clang/lib/CodeGen/CGStmt.cpp
index f84f6a630f3..794d7cb272a 100644
--- a/clang/lib/CodeGen/CGStmt.cpp
+++ b/clang/lib/CodeGen/CGStmt.cpp
@@ -1004,10 +1004,11 @@ void CodeGenFunction::EmitAsmStmt(const AsmStmt &S) {
   }
   
   // Add machine specific clobbers
-  if (const char *C = Target.getClobbers()) {
+  std::string MachineClobbers = Target.getClobbers();
+  if (!MachineClobbers.empty()) {
     if (!Constraints.empty())
       Constraints += ',';
-    Constraints += C;
+    Constraints += MachineClobbers;
   }
     
   const llvm::FunctionType *FTy =