derek.holloway
7502bf64a4
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46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
// RUN: %clang_cc1 -fsyntax-only %s -verify
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#ifndef __has_warning
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#error Should have __has_warning
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#endif
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#if __has_warning("not valid") // expected-warning {{__has_warning expected option name}}
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#endif
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// expected-warning@+2 {{Should have -Wparentheses}}
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#if __has_warning("-Wparentheses")
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#warning Should have -Wparentheses
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#endif
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// expected-error@+2 {{expected string literal in '__has_warning'}}
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// expected-error@+1 {{missing ')'}} expected-note@+1 {{match}}
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#if __has_warning(-Wfoo)
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#endif
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// expected-warning@+3 {{Not a valid warning flag}}
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#if __has_warning("-Wnot-a-valid-warning-flag-at-all")
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#else
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#warning Not a valid warning flag
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#endif
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// expected-error@+1 {{missing '(' after '__has_warning'}}
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#if __has_warning "not valid"
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#endif
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// Macro expansion does not occur in the parameter to __has_warning
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// (as is also expected behaviour for ordinary macros), so the
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// following should not expand:
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#define MY_ALIAS "-Wparentheses"
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// expected-error@+1 {{expected}}
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#if __has_warning(MY_ALIAS)
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#error Alias expansion not allowed
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#endif
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// But deferring should expand:
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#define HAS_WARNING(X) __has_warning(X)
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#if !HAS_WARNING(MY_ALIAS)
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#error Expansion should have occurred
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#endif
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