enumerator value of 0 is not a null pointer constant for

deciding const of null pointer conversion. Fixes PR5086.

llvm-svn: 83217

2 files changed, 24 insertions, 0 deletions

diff --git a/clang/lib/Sema/SemaOverload.cpp b/clang/lib/Sema/SemaOverload.cpp
index 18614f78709..433ca79b48f 100644
--- a/clang/lib/Sema/SemaOverload.cpp
+++ b/clang/lib/Sema/SemaOverload.cpp
@@ -887,6 +887,9 @@ static bool isNullPointerConstantForConversion(Expr *Expr,
       Expr->getType()->isIntegralType())
     return !InOverloadResolution;
 
+  if (Expr->getType()->isEnumeralType())
+    return !InOverloadResolution;
+
   return Expr->isNullPointerConstant(Context,
                     InOverloadResolution? Expr::NPC_ValueDependentIsNotNull
                                         : Expr::NPC_ValueDependentIsNull);
diff --git a/clang/test/CodeGenCXX/PR5086-ambig-resolution-enum.cpp b/clang/test/CodeGenCXX/PR5086-ambig-resolution-enum.cpp
new file mode 100644
index 00000000000..49bf7997b1b
--- /dev/null
+++ b/clang/test/CodeGenCXX/PR5086-ambig-resolution-enum.cpp
@@ -0,0 +1,21 @@
+// RUN: clang-cc -triple x86_64-apple-darwin -std=c++0x -S %s -o %t-64.s &&
+// RUN: FileCheck -check-prefix LP64 --input-file=%t-64.s %s &&
+// RUN: clang-cc -triple i386-apple-darwin -std=c++0x -S %s -o %t-32.s &&
+// RUN: FileCheck -check-prefix LP32 --input-file=%t-32.s %s &&
+// RUN: true
+
+class UnicodeString {
+public:
+        enum EInvariant { kInvariant };
+        int extract(int targetCapacity, enum EInvariant inv) const;
+        int extract(unsigned targetLength, const char *codepage) const;
+};
+
+void foo(const UnicodeString& id) {
+        enum {BUFLEN = 128 };
+        id.extract(BUFLEN - 2, UnicodeString::kInvariant);
+}
+
+// CHECK-LP64: call     __ZNK13UnicodeString7extractEiNS_10EInvariantE
+
+// CHECK-LP32: call     L__ZNK13UnicodeString7extractEiNS_10EInvariantE