musl/include/assert.h

#include <features.h>

#undef assert

#ifdef NDEBUG
#define	assert(x) (void)0
#else
#define assert(x) ((void)((x) || (__assert_fail(#x, __FILE__, __LINE__, __func__),0)))
#endif

#ifdef __cplusplus
extern "C" {
#endif

_Noreturn void __assert_fail (const char *, const char *, int, const char *);

#ifdef __cplusplus
}
#endif
default features: make musl usable without feature test macros the old behavior of exposing nothing except plain ISO C can be obtained by defining __STRICT_ANSI__ or using a compiler option (such as -std=c99) that predefines it. the new default featureset is POSIX with XSI plus _BSD_SOURCE. any explicit feature test macros will inhibit the default. installation docs have also been updated to reflect this change. 2012-09-08 03:13:55 +00:00			`#include <features.h>`
initial check-in, version 0.5.0 2011-02-12 05:22:29 +00:00
default features: make musl usable without feature test macros the old behavior of exposing nothing except plain ISO C can be obtained by defining __STRICT_ANSI__ or using a compiler option (such as -std=c99) that predefines it. the new default featureset is POSIX with XSI plus _BSD_SOURCE. any explicit feature test macros will inhibit the default. installation docs have also been updated to reflect this change. 2012-09-08 03:13:55 +00:00			`#undef assert`
further use of _Noreturn, for non-plain-C functions note that POSIX does not specify these functions as _Noreturn, because POSIX is aligned with C99, not the new C11 standard. when POSIX is eventually updated to C11, it will almost surely give these functions the _Noreturn attribute. for now, the actual _Noreturn keyword is not used anyway when compiling with a c99 compiler, which is what POSIX requires; the GCC __attribute__ is used instead if it's available, however. in a few places, I've added infinite for loops at the end of _Noreturn functions to silence compiler warnings. presumably __buildin_unreachable could achieve the same thing, but it would only work on newer GCCs and would not be portable. the loops should have near-zero code size cost anyway. like the previous _Noreturn commit, this one is based on patches contributed by philomath. 2012-09-07 03:34:10 +00:00
initial check-in, version 0.5.0 2011-02-12 05:22:29 +00:00			`#ifdef NDEBUG`
			`#define assert(x) (void)0`
			`#else`
assert() is supposed to have type void 2012-10-17 06:47:11 +00:00			`#define assert(x) ((void)((x) \|\| (__assert_fail(#x, __FILE__, __LINE__, __func__),0)))`
initial check-in, version 0.5.0 2011-02-12 05:22:29 +00:00			`#endif`

			`#ifdef __cplusplus`
			`extern "C" {`
			`#endif`

further use of _Noreturn, for non-plain-C functions note that POSIX does not specify these functions as _Noreturn, because POSIX is aligned with C99, not the new C11 standard. when POSIX is eventually updated to C11, it will almost surely give these functions the _Noreturn attribute. for now, the actual _Noreturn keyword is not used anyway when compiling with a c99 compiler, which is what POSIX requires; the GCC __attribute__ is used instead if it's available, however. in a few places, I've added infinite for loops at the end of _Noreturn functions to silence compiler warnings. presumably __buildin_unreachable could achieve the same thing, but it would only work on newer GCCs and would not be portable. the loops should have near-zero code size cost anyway. like the previous _Noreturn commit, this one is based on patches contributed by philomath. 2012-09-07 03:34:10 +00:00			`_Noreturn void __assert_fail (const char , const char , int, const char *);`
initial check-in, version 0.5.0 2011-02-12 05:22:29 +00:00
			`#ifdef __cplusplus`
			`}`
			`#endif`