1 static int foo(void) __attribute__((unknown_attribute));
   2 
   3 /*
   4  * check-name: warn-unknown-attribute
   5  *
   6  * check-error-start
   7 Wunknown-attribute-def.c:1:37: warning: attribute 'unknown_attribute': unknown attribute
   8  * check-error-end
   9  */