optimize two-way strstr and memmem bad character shift
[musl.git] / include / features.h
blobf4d651efcd0a39b021fec66cdf1469b941654a5a
1 #ifndef _FEATURES_H
2 #define _FEATURES_H
4 #if defined(_ALL_SOURCE) && !defined(_GNU_SOURCE)
5 #define _GNU_SOURCE 1
6 #endif
8 #if defined(_DEFAULT_SOURCE) && !defined(_BSD_SOURCE)
9 #define _BSD_SOURCE 1
10 #endif
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
19 #if __STDC_VERSION__ >= 199901L
20 #define __restrict restrict
21 #elif !defined(__GNUC__)
22 #define __restrict
23 #endif
25 #if __STDC_VERSION__ >= 199901L || defined(__cplusplus)
26 #define __inline inline
27 #elif !defined(__GNUC__)
28 #define __inline
29 #endif
31 #if __STDC_VERSION__ >= 201112L
32 #elif defined(__GNUC__)
33 #define _Noreturn __attribute__((__noreturn__))
34 #else
35 #define _Noreturn
36 #endif
38 #endif