Fix a crash in type merging with enum types.

llvm-svn: 162886

2 files changed, 10 insertions, 3 deletions

diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index 0c2cc1c6171..33846019810 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -6413,10 +6413,13 @@ QualType ASTContext::mergeFunctionTypes(QualType lhs, QualType rhs,
     for (unsigned i = 0; i < proto_nargs; ++i) {
       QualType argTy = proto->getArgType(i);
       
-      // Look at the promotion type of enum types, since that is the type used
+      // Look at the converted type of enum types, since that is the type used
       // to pass enum values.
-      if (const EnumType *Enum = argTy->getAs<EnumType>())
-        argTy = Enum->getDecl()->getPromotionType();
+      if (const EnumType *Enum = argTy->getAs<EnumType>()) {
+        argTy = Enum->getDecl()->getIntegerType();
+        if (argTy.isNull())
+          return QualType();
+      }
       
       if (argTy->isPromotableIntegerType() ||
           getCanonicalType(argTy).getUnqualifiedType() == FloatTy)
diff --git a/clang/test/Sema/function-redecl.c b/clang/test/Sema/function-redecl.c
index 7076bdf3bd1..ff8e003cd72 100644
--- a/clang/test/Sema/function-redecl.c
+++ b/clang/test/Sema/function-redecl.c
@@ -129,3 +129,7 @@ void test_x() {
 enum e0 {one}; 
 void f3(); 
 void f3(enum e0 x) {}
+
+enum incomplete_enum;
+void f4(); // expected-note {{previous declaration is here}}
+void f4(enum incomplete_enum); // expected-error {{conflicting types for 'f4'}}