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musl/include/features.h

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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
#ifndef _FEATURES_H
#define _FEATURES_H
#if !defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) \
&& !defined(_XOPEN_SOURCE) && !defined(_GNU_SOURCE) \
&& !defined(_BSD_SOURCE) && !defined(__STRICT_ANSI__)
#define _BSD_SOURCE 1
#define _XOPEN_SOURCE 700
#endif
#if __STDC_VERSION__ >= 199901L
#define __restrict restrict
#elif !defined(__GNUC__)
#define __restrict
#endif
#if __STDC_VERSION__ >= 199901L || defined(__cplusplus)
#define __inline inline
#endif
#if __STDC_VERSION__ >= 201112L
#elif defined(__GNUC__)
#define _Noreturn __attribute__((__noreturn__))
#else
#define _Noreturn
#endif
#endif