llvm-project/clang/test/Preprocessor/pragma_poison.c

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// RUN: clang-cc %s -Eonly -verify
2006-06-25 13:40:49 +08:00
#pragma GCC poison rindex
rindex(some_string, 'h'); // expected-error {{attempt to use a poisoned identifier}}
#define BAR _Pragma ("GCC poison XYZW") XYZW /*NO ERROR*/
XYZW // ok
BAR
XYZW // expected-error {{attempt to use a poisoned identifier}}
// Pragma poison shouldn't warn from macro expansions defined before the token
// is poisoned.
#define strrchr rindex2
#pragma GCC poison rindex2
// Can poison multiple times.
#pragma GCC poison rindex2
strrchr(some_string, 'h'); // ok.