Preprocessor: don't keep comments under -traditional-cpp.
This patch is designed for minimal intrusion into normal preprocessing
and compilation; under -E -traditional-cpp, the lexer will still
generate tok::comment nodes since it is preserving all whitespace, but
the output printer will then throw it away.
<rdar://problem/13338680>
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176534 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Preprocessor/traditional-cpp.c b/test/Preprocessor/traditional-cpp.c
index 0396c9b..4c4633e 100644
--- a/test/Preprocessor/traditional-cpp.c
+++ b/test/Preprocessor/traditional-cpp.c
@@ -5,8 +5,14 @@
/*
RUN: %clang_cc1 -traditional-cpp %s -E -o %t
RUN: FileCheck -strict-whitespace < %t %s
+ RUN: %clang_cc1 -traditional-cpp %s -E -C | FileCheck -check-prefix=CHECK-COMMENTS %s
*/
+/* -traditional-cpp should eliminate all C89 comments. */
+/* CHECK-NOT: /*
+ * CHECK-COMMENTS: {{^}}/* -traditional-cpp should eliminate all C89 comments. *{{/$}}
+ */
+
/* CHECK: {{^}}foo // bar{{$}}
*/
foo // bar