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 {{missing ')'}} expected-note@+1 {{match}} 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@+1 {{missing '(' after '__has_warning'}} 26 #if __has_warning "not valid" 27 #endif 28 29 // Macro expansion does not occur in the parameter to __has_warning 30 // (as is also expected behaviour for ordinary macros), so the 31 // following should not expand: 32 33 #define MY_ALIAS "-Wparentheses" 34 35 // expected-error@+1 {{expected}} 36 #if __has_warning(MY_ALIAS) 37 #error Alias expansion not allowed 38 #endif 39 40 // But deferring should expand: 41 #define HAS_WARNING(X) __has_warning(X) 42 43 #if !HAS_WARNING(MY_ALIAS) 44 #error Expansion should have occurred 45 #endif 46
