Testcase for r183015.

I hate svn add.

llvm-svn: 183019

clang/test/Sema/builtins-gnu-mode.c

@@ -0,0 +1,27 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c99 %s
+// PR16138
+// expected-no-diagnostics
+
+int alloca;
+int stpcpy;
+int stpncpy;
+int strdup;
+int strndup;
+int index;
+int rindex;
+int bzero;
+int strcasecmp;
+int strncasecmp;
+int _exit;
+int vfork;
+int _setjmp;
+int __sigsetjmp;
+int sigsetjmp;
+int setjmp_syscall;
+int savectx;
+int qsetjmp;
+int getcontext;
+int _longjmp;
+int siglongjmp;
+int strlcpy;
+int strlcat;