PR3679 - handle #pragma weak
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77573 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/Sema.cpp b/lib/Sema/Sema.cpp
index 3966251..f0aea43 100644
--- a/lib/Sema/Sema.cpp
+++ b/lib/Sema/Sema.cpp
@@ -13,6 +13,7 @@
//===----------------------------------------------------------------------===//
#include "Sema.h"
+#include "llvm/ADT/DenseMap.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclObjC.h"
@@ -242,6 +243,15 @@
// template instantiations earlier.
PerformPendingImplicitInstantiations();
+ // check for #pragma weak identifiers that were never declared
+ for (llvm::DenseMap<IdentifierInfo*,WeakInfo>::iterator
+ I = WeakUndeclaredIdentifiers.begin(),
+ E = WeakUndeclaredIdentifiers.end(); I != E; ++I) {
+ if (!I->second.getUsed())
+ Diag(I->second.getLocation(), diag::warn_weak_identifier_undeclared)
+ << I->first;
+ }
+
if (!CompleteTranslationUnit)
return;