PR16074, implement warnings to catch pointer to boolean true and pointer to

null comparison when the pointer is known to be non-null.

This catches the array to pointer decay, function to pointer decay and
address of variables.  This does not catch address of function since this
has been previously used to silence a warning.

Pointer to bool conversion is under -Wbool-conversion.
Pointer to null comparison is under -Wtautological-pointer-compare, a sub-group
of -Wtautological-compare.

void foo() {
  int arr[5];
  int x;
  // warn on these conditionals
  if (foo);
  if (arr);
  if (&x);
  if (foo == null);
  if (arr == null);
  if (&x == null);

  if (&foo);  // no warning
}

llvm-svn: 202216

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/test/SemaCXX/nullptr_in_arithmetic_ops.cpp b/clang/test/SemaCXX/nullptr_in_arithmetic_ops.cpp
index 9671353907c..60b4670b3a5 100644
--- a/clang/test/SemaCXX/nullptr_in_arithmetic_ops.cpp
+++ b/clang/test/SemaCXX/nullptr_in_arithmetic_ops.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -fblocks -std=c++11 -verify %s
+// RUN: %clang_cc1 -fsyntax-only -Wno-tautological-pointer-compare -fblocks -std=c++11 -verify %s
 
 void foo() {
   int a;