Diagnose about extern "C" functions returning c++ objects
on first declaration only. // rdar://13364028
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@177127 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 4c6da45..245bc2c 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -6793,7 +6793,8 @@
// If this function is declared as being extern "C", then check to see if
// the function returns a UDT (class, struct, or union type) that is not C
// compatible, and if it does, warn the user.
- if (NewFD->isExternC()) {
+ // But, issue any diagnostic on the first declaration only.
+ if (NewFD->isExternC() && Previous.empty()) {
QualType R = NewFD->getResultType();
if (R->isIncompleteType() && !R->isVoidType())
Diag(NewFD->getLocation(), diag::warn_return_value_udt_incomplete)