derek.holloway
7502bf64a4
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39 lines
1.9 KiB
C
39 lines
1.9 KiB
C
// RUN: %clang_cc1 -verify=ext -std=c23 -pedantic %s
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// RUN: %clang_cc1 -verify=ext -pedantic -x c++ %s
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// RUN: %clang_cc1 -verify=pre -std=c2y -pedantic -Wpre-c2y-compat %s
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/* WG14 N3457: Clang 22
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* The __COUNTER__ predefined macro
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*
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* This predefined macro was supported as an extension in earlier versions of
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* Clang, but the required diagnostics for the limits were not added until 22.
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*/
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// Ensure that __COUNTER__ starts from 0.
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static_assert(__COUNTER__ == 0); /* ext-warning {{'__COUNTER__' is a C2y extension}}
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pre-warning {{'__COUNTER__' is incompatible with standards before C2y}}
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*/
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// Ensure that the produced value can be used with token concatenation.
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#define CAT_IMPL(a, b) a ## b
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#define CAT(a, b) CAT_IMPL(a, b)
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#define NAME_WITH_COUNTER(a) CAT(a, __COUNTER__)
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void test() {
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// Because this is the 2nd expansion, this defines test1.
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int NAME_WITH_COUNTER(test); /* ext-warning {{'__COUNTER__' is a C2y extension}}
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pre-warning {{'__COUNTER__' is incompatible with standards before C2y}}
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*/
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int other_test = test1; // Ok
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}
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// Ensure that __COUNTER__ increments each time you mention it.
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static_assert(__COUNTER__ == 2); /* ext-warning {{'__COUNTER__' is a C2y extension}}
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pre-warning {{'__COUNTER__' is incompatible with standards before C2y}}
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*/
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static_assert(__COUNTER__ == 3); /* ext-warning {{'__COUNTER__' is a C2y extension}}
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pre-warning {{'__COUNTER__' is incompatible with standards before C2y}}
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*/
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static_assert(__COUNTER__ == 4); /* ext-warning {{'__COUNTER__' is a C2y extension}}
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pre-warning {{'__COUNTER__' is incompatible with standards before C2y}}
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*/
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