1 files changed, 18 insertions, 0 deletions
diff --git a/clang/test/Preprocessor/extension-warning.c b/clang/test/Preprocessor/extension-warning.c
new file mode 100644
index 0000000..4ba57f7
--- /dev/null
+++ b/clang/test/Preprocessor/extension-warning.c
@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -pedantic %s
+
+// The preprocessor shouldn't warn about extensions within macro bodies that
+// aren't expanded.
+#define TY typeof
+#define TY1 typeof(1)
+
+// But we should warn here
+TY1 x; // expected-warning {{extension}}
+TY(1) x; // FIXME: And we should warn here
+
+// Note: this warning intentionally doesn't trigger on keywords like
+// __attribute; the standard allows implementation-defined extensions
+// prefixed with "__".
+// Current list of keywords this can trigger on:
+// inline, restrict, asm, typeof, _asm
+
+void whatever() {}