Make '-Werror=frame-larger-than=' and associated diagnostic pragmas GCC-compatible

It turns out the trailing '=' really is part of the option name spelling and
treating it as such gets us compatible with GCC's -Werror= and pragmas.

(GCC doesn't appear to support any -Wno- form for this diagnostic but we do.)

llvm-svn: 210503

1 files changed, 10 insertions, 0 deletions

diff --git a/clang/test/Misc/backend-stack-frame-diagnostics.cpp b/clang/test/Misc/backend-stack-frame-diagnostics.cpp
index 19303594b2b..c14d1a2a498 100644
--- a/clang/test/Misc/backend-stack-frame-diagnostics.cpp
+++ b/clang/test/Misc/backend-stack-frame-diagnostics.cpp
@@ -22,6 +22,16 @@ void frameSizeWarning();
 
 void frameSizeWarning(int) {}
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wframe-larger-than="
+// expected-warning@+1 {{unknown warning group '-Wframe-larger-than'}}
+#pragma GCC diagnostic ignored "-Wframe-larger-than"
+void frameSizeWarningIgnored() {
+  char buffer[80];
+  doIt(buffer);
+}
+#pragma GCC diagnostic pop
+
 void frameSizeLocalClassWarning() {
   struct S {
     S() { // expected-warning-re {{stack frame size of {{[0-9]+}} bytes in function 'frameSizeLocalClassWarning()::S::S'}}