github.com/afumu/libc@v0.0.6/musl/include/features.h (about)

     1  #ifndef _FEATURES_H
     2  #define _FEATURES_H
     3  
     4  #if defined(_ALL_SOURCE) && !defined(_GNU_SOURCE)
     5  #define _GNU_SOURCE 1
     6  #endif
     7  
     8  #if defined(_DEFAULT_SOURCE) && !defined(_BSD_SOURCE)
     9  #define _BSD_SOURCE 1
    10  #endif
    11  
    12  #if !defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) \
    13   && !defined(_XOPEN_SOURCE) && !defined(_GNU_SOURCE) \
    14   && !defined(_BSD_SOURCE) && !defined(__STRICT_ANSI__)
    15  #define _BSD_SOURCE 1
    16  #define _XOPEN_SOURCE 700
    17  #endif
    18  
    19  #if __STDC_VERSION__ >= 199901L
    20  #define __restrict restrict
    21  #elif !defined(__GNUC__)
    22  #define __restrict
    23  #endif
    24  
    25  #if __STDC_VERSION__ >= 199901L || defined(__cplusplus)
    26  #define __inline inline
    27  #elif !defined(__GNUC__)
    28  #define __inline
    29  #endif
    30  
    31  #if __STDC_VERSION__ >= 201112L
    32  #elif defined(__GNUC__)
    33  #define _Noreturn __attribute__((__noreturn__))
    34  #else
    35  #define _Noreturn
    36  #endif
    37  
    38  #define __REDIR(x,y) __typeof__(x) x __asm__(#y)
    39  
    40  #endif