Downgrade error about stdcall decls with no prototype to a warning

Fixes PR21027.  The MIDL compiler produces code that does this.

If we wanted to improve the warning, I think we could do this:
  void __stdcall f(); // Don't warn without -Wstrict-prototypes.
  void g() {
    f(); // Might warn, the user probably meant for f to take no args.
    f(1, 2, 3); // Warn, we have no idea what args f takes.
    f(1); // Error, this is insane, one of these calls is broken.
  }

Reviewers: thakis

Differential Revision: http://reviews.llvm.org/D5481

llvm-svn: 218394

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/test/Sema/callingconv.c b/clang/test/Sema/callingconv.c
index f9fa9fef2b3..68908152ff6 100644
--- a/clang/test/Sema/callingconv.c
+++ b/clang/test/Sema/callingconv.c
@@ -10,7 +10,7 @@ void __attribute__((stdcall)) bar(float *a) {
 void __attribute__((fastcall(1))) baz(float *a) { // expected-error {{'fastcall' attribute takes no arguments}}
 }
 
-void __attribute__((fastcall)) test0() { // expected-error {{function with no prototype cannot use fastcall calling convention}}
+void __attribute__((fastcall)) test0() { // expected-error {{function with no prototype cannot use the callee-cleanup fastcall calling convention}}
 }
 
 void __attribute__((fastcall)) test1(void) {