Add LLVMContext::emitWarning methods and use them. <rdar://problem/12867368>

When the backend is used from clang, it should produce proper diagnostics
instead of just printing messages to errs(). Other clients may also want to
register their own error handlers with the LLVMContext, and the same handler
should work for warnings in the same way as the existing emitError methods.

llvm-svn: 171041

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/Transforms/Instrumentation/OptimalEdgeProfiling.cpp b/llvm/lib/Transforms/Instrumentation/OptimalEdgeProfiling.cpp
index 8f8d027dca7..3c851681b90 100644
--- a/llvm/lib/Transforms/Instrumentation/OptimalEdgeProfiling.cpp
+++ b/llvm/lib/Transforms/Instrumentation/OptimalEdgeProfiling.cpp
@@ -22,6 +22,7 @@
 #include "llvm/Analysis/ProfileInfo.h"
 #include "llvm/Analysis/ProfileInfoLoader.h"
 #include "llvm/Constants.h"
+#include "llvm/LLVMContext.h"
 #include "llvm/Module.h"
 #include "llvm/Pass.h"
 #include "llvm/Support/Debug.h"
@@ -75,8 +76,8 @@ inline static void printEdgeCounter(ProfileInfo::Edge e,
 bool OptimalEdgeProfiler::runOnModule(Module &M) {
   Function *Main = M.getFunction("main");
   if (Main == 0) {
-    errs() << "WARNING: cannot insert edge profiling into a module"
-           << " with no main function!\n";
+    M.getContext().emitWarning("cannot insert edge profiling into a module"
+                               " with no main function");
     return false;  // No main, no instrumentation!
   }