Ignore implicity casts for zero-as-null-pointer-constant warning

The repro in https://bugs.llvm.org/show_bug.cgi?id=34362
caused the left nullptr to be cast to a int* implicitly, which
resulted diagnosing this falsely.

Differential Revision: https://reviews.llvm.org/D39301

llvm-svn: 316605

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/warn-zero-nullptr.cpp b/clang/test/SemaCXX/warn-zero-nullptr.cpp
index edd2a759b70..72280405d7c 100644
--- a/clang/test/SemaCXX/warn-zero-nullptr.cpp
+++ b/clang/test/SemaCXX/warn-zero-nullptr.cpp
@@ -25,3 +25,10 @@ void g() {
 // Warn on these too. Matches gcc and arguably makes sense.
 void* pp = (decltype(nullptr))0; // expected-warning{{zero as null pointer constant}}
 void* pp2 = static_cast<decltype(nullptr)>(0); // expected-warning{{zero as null pointer constant}}
+
+// Shouldn't warn.
+namespace pr34362 {
+struct A { operator int*() { return nullptr; } };
+void func() { if (nullptr == A()) {} }
+void func2() { if ((nullptr) == A()) {} }
+}