[SemaCXX] Silence -Wconstant-logical-operand if the operand is a 0/1 from a macro.

Libraries specify enabled/disabled features using macro defs of 0/1, in such cases the -Wconstant-logical-operand
is noise.

rdar://15410291

llvm-svn: 207386

1 files changed, 10 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/expressions.cpp b/clang/test/SemaCXX/expressions.cpp
index 25a9c841725..1a50c99c590 100644
--- a/clang/test/SemaCXX/expressions.cpp
+++ b/clang/test/SemaCXX/expressions.cpp
@@ -125,3 +125,13 @@ namespace pr16992 {
     return (sizeof T());
   }
 }
+
+void test4() {
+  #define X 0
+  #define Y 1
+  bool r1 = X || Y;
+
+  #define Y2 2
+  bool r2 = X || Y2; // expected-warning {{use of logical '||' with constant operand}} \
+                     // expected-note {{use '|' for a bitwise operation}}
+}