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 // expected-error@+2 {{expected string literal in '__has_warning'}} 15 // expected-error@+1 {{expected value in expression}} 16 #if __has_warning(-Wfoo) 17 #endif 18 19 // expected-warning@+3 {{Not a valid warning flag}} 20 #if __has_warning("-Wnot-a-valid-warning-flag-at-all") 21 #else 22 #warning Not a valid warning flag 23 #endif 24 25 // expected-error@+2 {{builtin warning check macro requires a parenthesized string}} 26 // expected-error@+1 {{invalid token}} 27 #if __has_warning "not valid" 28 #endif 29 30 // Macro expansion does not occur in the parameter to __has_warning 31 // (as is also expected behaviour for ordinary macros), so the 32 // following should not expand: 33 34 #define MY_ALIAS "-Wparentheses" 35 36 // expected-error@+1 2{{expected}} 37 #if __has_warning(MY_ALIAS) 38 #error Alias expansion not allowed 39 #endif 40 41 // But deferring should expand: 42 #define HAS_WARNING(X) __has_warning(X) 43 44 #if !HAS_WARNING(MY_ALIAS) 45 #error Expansion should have occurred 46 #endif 47
