| 1 | // RUN: %clang_cc1 -fsyntax-only %s -verify |
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| 2 | #ifndef __has_warning |
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| 3 | #error Should have __has_warning |
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| 4 | #endif |
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| 5 | |
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| 6 | #if __has_warning("not valid") // expected-warning {{__has_warning expected option name}} |
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| 7 | #endif |
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| 8 | |
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| 9 | // expected-warning@+2 {{Should have -Wparentheses}} |
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| 10 | #if __has_warning("-Wparentheses") |
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| 11 | #warning Should have -Wparentheses |
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| 12 | #endif |
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| 13 | |
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| 14 | // expected-error@+2 {{expected string literal in '__has_warning'}} |
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| 15 | // expected-error@+1 {{missing ')'}} expected-note@+1 {{match}} |
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| 16 | #if __has_warning(-Wfoo) |
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| 17 | #endif |
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| 18 | |
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| 19 | // expected-warning@+3 {{Not a valid warning flag}} |
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| 20 | #if __has_warning("-Wnot-a-valid-warning-flag-at-all") |
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| 21 | #else |
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| 22 | #warning Not a valid warning flag |
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| 23 | #endif |
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| 24 | |
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| 25 | // expected-error@+1 {{missing '(' after '__has_warning'}} |
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| 26 | #if __has_warning "not valid" |
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| 27 | #endif |
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| 28 | |
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| 29 | // Macro expansion does not occur in the parameter to __has_warning |
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| 30 | // (as is also expected behaviour for ordinary macros), so the |
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| 31 | // following should not expand: |
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| 32 | |
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| 33 | #define MY_ALIAS "-Wparentheses" |
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| 34 | |
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| 35 | // expected-error@+1 {{expected}} |
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| 36 | #if __has_warning(MY_ALIAS) |
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| 37 | #error Alias expansion not allowed |
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| 38 | #endif |
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| 39 | |
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| 40 | // But deferring should expand: |
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| 41 | #define HAS_WARNING(X) __has_warning(X) |
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| 42 | |
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| 43 | #if !HAS_WARNING(MY_ALIAS) |
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| 44 | #error Expansion should have occurred |
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| 45 | #endif |
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| 46 | |
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