Fix crash generating debug info for constructor for anonymous struct.

llvm-svn: 93601

clang/lib/CodeGen/CGDebugInfo.cpp

@@ -1001,7 +1001,7 @@ void CGDebugInfo::EmitFunctionStart(GlobalDecl GD, QualType FnType,
   const Decl *D = GD.getDecl();
   if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
     Name = getFunctionName(FD);
-    if (Name[0] == '\01')
+    if (!Name.empty() && Name[0] == '\01')
       Name = Name.substr(1);
     // Use mangled name as linkage name for c/c++ functions.
     LinkageName = CGM.getMangledName(GD);

clang/test/CodeGenCXX/debug-info.cpp

@@ -18,3 +18,9 @@ void f() {
   int B::*a = 0;
   void (B::*b)() = 0;
 }
+
+namespace EmptyNameCrash {
+  struct A { A(); };
+  typedef struct { A x; } B;
+  B x;
+}