1 files changed, 11 insertions, 0 deletions
diff --git a/test/Sema/pointer-subtract-compat.c b/test/Sema/pointer-subtract-compat.c
new file mode 100644
index 0000000..b3be37e
--- /dev/null
+++ b/test/Sema/pointer-subtract-compat.c
@@ -0,0 +1,11 @@
+// RUN: clang-cc %s -fsyntax-only -verify -pedantic
+
+typedef const char rchar;
+int a(char* a, rchar* b) {
+  return a-b;
+}
+
+// <rdar://problem/6520707> 
+void f0(void (*fp)(void)) {
+  int x = fp - fp; // expected-warning{{arithmetic on pointer to function type 'void (*)(void)' is a GNU extension}}
+}