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3a11d5a8df
New option `-Wundef-true` added and enabled by default to warn when `true` is used in the C preprocessor without being defined before C23.
79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
// RUN: %clang_cc1 %s -Eonly -std=c89 -verify=undef-true
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// RUN: %clang_cc1 %s -Eonly -std=c99 -verify=undef-true
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// RUN: %clang_cc1 %s -Eonly -std=c11 -verify=undef-true
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// RUN: %clang_cc1 %s -Eonly -std=c17 -verify=undef-true
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// RUN: %clang_cc1 %s -Eonly -std=c23 -verify=undef-true
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#if __STDC_VERSION__ >= 202311L
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/* undef-true-no-diagnostics */
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#endif
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#define FOO true
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#if FOO /* #1 */
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#endif
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#if __STDC_VERSION__ < 202311L
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/* undef-true-warning@#1 {{'true' is not defined, evaluates to 0}} */
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#endif
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#if true /* #2 */
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#endif
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#if __STDC_VERSION__ < 202311L
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/* undef-true-warning@#2 {{'true' is not defined, evaluates to 0}} */
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#endif
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#if false || true /* #3 */
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#endif
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#if __STDC_VERSION__ < 202311L
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/* undef-true-warning@#3 {{'true' is not defined, evaluates to 0}} */
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#endif
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#define true 1
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#define FOO true
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#if FOO
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#endif
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#if true
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#endif
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#if false || true
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#endif
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#undef true
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#define FOO true
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#if FOO /* #4 */
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#endif
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#if __STDC_VERSION__ < 202311L
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/* undef-true-warning@#4 {{'true' is not defined, evaluates to 0}} */
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#endif
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#if true /* #5 */
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#endif
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#if __STDC_VERSION__ < 202311L
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/* undef-true-warning@#5 {{'true' is not defined, evaluates to 0}} */
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#endif
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#if false || true /* #6 */
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#endif
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#if __STDC_VERSION__ < 202311L
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/* undef-true-warning@#6 {{'true' is not defined, evaluates to 0}} */
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#endif
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#define true true
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#if true /* #7 */
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#endif
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#if __STDC_VERSION__ < 202311L
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/* undef-true-warning@#7 {{'true' is not defined, evaluates to 0}} */
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#endif
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#undef true
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/* Test that #pragma-enabled 'Wundef' can override 'Wundef-true' */
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#pragma clang diagnostic warning "-Wundef"
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#if true /* #8 */
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#endif
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#pragma clang diagnostic ignored "-Wundef"
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#if __STDC_VERSION__ < 202311L
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/* undef-true-warning@#8 {{'true' is not defined, evaluates to 0}} */
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#endif
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