1 // RUN: %clang_cc1 -fsyntax-only %s -verify 2 #ifndef __has_warning 3 #error Should have __has_warning 4 #endif 5 6 #if __has_warning("not valid") // expected-warning {{__has_warning expected option name}} 7 #endif 8 9 // expected-warning@+2 {{Should have -Wparentheses}} 10 #if __has_warning("-Wparentheses") 11 #warning Should have -Wparentheses 12 #endif 13 14 #if __has_warning(-Wfoo) // expected-error {{builtin warning check macro requires a parenthesized string}} 15 #endif 16 17 // expected-warning@+3 {{Not a valid warning flag}} 18 #if __has_warning("-Wnot-a-valid-warning-flag-at-all") 19 #else 20 #warning Not a valid warning flag 21 #endif 22