// RUN: %clang_cc1 %s -Eonly -std=c89 -verify=undef-true // RUN: %clang_cc1 %s -Eonly -std=c99 -verify=undef-true // RUN: %clang_cc1 %s -Eonly -std=c11 -verify=undef-true // RUN: %clang_cc1 %s -Eonly -std=c17 -verify=undef-true // RUN: %clang_cc1 %s -Eonly -std=c23 -verify=undef-true #if __STDC_VERSION__ >= 202311L /* undef-true-no-diagnostics */ #endif #define FOO true #if FOO /* #1 */ #endif #if __STDC_VERSION__ < 202311L /* undef-true-warning@#1 {{'true' is not defined, evaluates to 0}} */ #endif #if true /* #2 */ #endif #if __STDC_VERSION__ < 202311L /* undef-true-warning@#2 {{'true' is not defined, evaluates to 0}} */ #endif #if false || true /* #3 */ #endif #if __STDC_VERSION__ < 202311L /* undef-true-warning@#3 {{'true' is not defined, evaluates to 0}} */ #endif #define true 1 #define FOO true #if FOO #endif #if true #endif #if false || true #endif #undef true #define FOO true #if FOO /* #4 */ #endif #if __STDC_VERSION__ < 202311L /* undef-true-warning@#4 {{'true' is not defined, evaluates to 0}} */ #endif #if true /* #5 */ #endif #if __STDC_VERSION__ < 202311L /* undef-true-warning@#5 {{'true' is not defined, evaluates to 0}} */ #endif #if false || true /* #6 */ #endif #if __STDC_VERSION__ < 202311L /* undef-true-warning@#6 {{'true' is not defined, evaluates to 0}} */ #endif #define true true #if true /* #7 */ #endif #if __STDC_VERSION__ < 202311L /* undef-true-warning@#7 {{'true' is not defined, evaluates to 0}} */ #endif #undef true /* Test that #pragma-enabled 'Wundef' can override 'Wundef-true' */ #pragma clang diagnostic warning "-Wundef" #if true /* #8 */ #endif #pragma clang diagnostic ignored "-Wundef" #if __STDC_VERSION__ < 202311L /* undef-true-warning@#8 {{'true' is not defined, evaluates to 0}} */ #endif