1 files changed, 33 insertions, 0 deletions
diff --git a/test/Sema/self-comparison.c b/test/Sema/self-comparison.c
new file mode 100644
index 0000000..db56e8b
--- /dev/null
+++ b/test/Sema/self-comparison.c
@@ -0,0 +1,33 @@
+// RUN: clang-cc -fsyntax-only -verify %s
+
+int foo(int x) {
+  return x == x; // expected-warning {{self-comparison always results}}
+}
+
+int foo2(int x) {
+  return (x) != (((x))); // expected-warning {{self-comparison always results}}
+}
+
+int qux(int x) {
+   return x < x; // expected-warning {{self-comparison}}
+}
+
+int qux2(int x) {
+   return x > x; // expected-warning {{self-comparison}}
+}
+
+int bar(float x) {
+  return x == x; // no-warning
+}
+
+int bar2(float x) {
+  return x != x; // no-warning
+}
+
+// Motivated by <rdar://problem/6703892>, self-comparisons of enum constants
+// should not be warned about.  These can be expanded from macros, and thus
+// are usually deliberate.
+int compare_enum() {
+  enum { A };
+  return A == A; // no-warning
+}