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| author | Corinna Vinschen <corinna@vinschen.de> | 2023-08-07 15:59:42 +0200 |
|---|---|---|
| committer | Corinna Vinschen <corinna@vinschen.de> | 2023-08-07 15:59:42 +0200 |
| commit | e66c63be6b800ae19ff21fe2f5c12e231986acb6 (patch) | |
| tree | ed66fd059036635c57ca96705de18d5501a05fc5 /newlib/libc | |
| parent | 3c75fac130b5720068707f67b12f4372abf4ad38 (diff) | |
| download | newlib-e66c63be6b800ae19ff21fe2f5c12e231986acb6.zip newlib-e66c63be6b800ae19ff21fe2f5c12e231986acb6.tar.gz newlib-e66c63be6b800ae19ff21fe2f5c12e231986acb6.tar.bz2 | |
sys/cdefs.h: introduce __restrict_arr, as in glibc
C99 allows to define arrays as non-overlappiung using the restrict
keyword. This is supported by GCC 3.1 and later, but it's not
allowed in C++.
This is in preparation of fixing a Cygwin build problem introduce by
commit 3c75fac130b5.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Diffstat (limited to 'newlib/libc')
| -rw-r--r-- | newlib/libc/include/sys/cdefs.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/newlib/libc/include/sys/cdefs.h b/newlib/libc/include/sys/cdefs.h index cc1a8a1..d13a92a 100644 --- a/newlib/libc/include/sys/cdefs.h +++ b/newlib/libc/include/sys/cdefs.h @@ -424,6 +424,19 @@ #endif /* + * Additionally, we allow to use `__restrict_arr' for declaring arrays as + * non-overlapping per C99. That's supported since gcc 3.1, but it's not + * allowed in C++. + */ +#if defined(__cplusplus) || !__GNUC_PREREQ__(3, 1) +#define __restrict_arr +#elif defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L +#define __restrict_arr restrict +#else +#define __restrict_arr +#endif + +/* * GNU C version 2.96 adds explicit branch prediction so that * the CPU back-end can hint the processor and also so that * code blocks can be reordered such that the predicted path |