[Sema] Fix operator lookup to consider local extern declarations.

Summary:
Previously Clang was not considering operator declarations that occur at function scope. This is incorrect according to [over.match.oper]p3
> The set of non-member candidates is the result of the unqualified lookup of operator@ in the context of the expression according to the usual rules for name lookup in unqualified function calls.

This patch changes operator name lookup to consider block scope declarations.
This patch fixes PR27027.




Reviewers: rsmith

Reviewed By: rsmith

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D35297

llvm-svn: 309530

1 files changed, 2 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaLookup.cpp b/clang/lib/Sema/SemaLookup.cpp
index 85596ed52e9..4f88edcb31f 100644
--- a/clang/lib/Sema/SemaLookup.cpp
+++ b/clang/lib/Sema/SemaLookup.cpp
@@ -1031,7 +1031,8 @@ struct FindLocalExternScope {
   FindLocalExternScope(LookupResult &R)
       : R(R), OldFindLocalExtern(R.getIdentifierNamespace() &
                                  Decl::IDNS_LocalExtern) {
-    R.setFindLocalExtern(R.getIdentifierNamespace() & Decl::IDNS_Ordinary);
+    R.setFindLocalExtern(R.getIdentifierNamespace() &
+                         (Decl::IDNS_Ordinary | Decl::IDNS_NonMemberOperator));
   }
   void restore() {
     R.setFindLocalExtern(OldFindLocalExtern);