Don't emit the extra checksum into the .gcda file if the user hasn't asked for

it. Fortunately, versions of gcov that predate the extra checksum also ignore
any extra data, so this isn't a problem. There will be a matching commit in
compiler-rt.

llvm-svn: 176745

1 files changed, 6 insertions, 4 deletions

diff --git a/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp b/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
index db1dd412830..c448caa15ab 100644
--- a/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
+++ b/llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
@@ -601,9 +601,10 @@ Constant *GCOVProfiler::getIncrementIndirectCounterFunc() {
 }
 
 Constant *GCOVProfiler::getEmitFunctionFunc() {
-  Type *Args[2] = {
+  Type *Args[3] = {
     Type::getInt32Ty(*Ctx),    // uint32_t ident
     Type::getInt8PtrTy(*Ctx),  // const char *function_name
+    Type::getInt8Ty(*Ctx),     // uint8_t use_extra_checksum
   };
   FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), Args, false);
   return M->getOrInsertFunction("llvm_gcda_emit_function", FTy);
@@ -668,12 +669,13 @@ void GCOVProfiler::insertCounterWriteout(
              I = CountersBySP.begin(), E = CountersBySP.end();
            I != E; ++I) {
         DISubprogram SP(I->second);
-        Builder.CreateCall2(EmitFunction,
+        Builder.CreateCall3(EmitFunction,
                             Builder.getInt32(i),
                             NoFunctionNamesInData ?
                               Constant::getNullValue(Builder.getInt8PtrTy()) :
-                              Builder.CreateGlobalStringPtr(SP.getName()));
-        
+                              Builder.CreateGlobalStringPtr(SP.getName()),
+                            Builder.getInt8(UseExtraChecksum));
+
         GlobalVariable *GV = I->first;
         unsigned Arcs =
           cast<ArrayType>(GV->getType()->getElementType())->getNumElements();