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Check for build environment instead of just _GNU_SOURCE

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Fixes the build on OpenBSD and NetBSD. It is too easy for _GNU_SOURCE
to be defined even on non-Linux systems. Found via py-zstandard with
the embedded copy of zstandard and Python defines _GNU_SOURCE.

Also simplify the Linux checking, there is no need to check the rest
of the symbol names.
This commit is contained in:
Brad Smith 2025-08-19 09:23:38 -04:00
parent cfeb29e397
commit 0d1f8de9ad
1 changed files with 7 additions and 5 deletions
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12
lib/dictBuilder/cover.c
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@ -21,10 +21,12 @@
/*-*************************************
* Dependencies
***************************************/
/* qsort_r is an extension. */
#if defined(__linux) || defined(__linux__) || defined(linux) || defined(__gnu_linux__) || \
defined(__CYGWIN__) || defined(__MSYS__)
# if !defined(_GNU_SOURCE) && !defined(__ANDROID__) /* NDK doesn't ship qsort_r(). */
/* qsort_r is an extension.
*
* Android NDK does not ship qsort_r().
*/
#if (defined(__linux__) && !defined(__ANDROID__)) || defined(__CYGWIN__) || defined(__MSYS__)
# ifndef _GNU_SOURCE
# define _GNU_SOURCE
# endif
#endif
@ -77,7 +79,7 @@
#ifndef ZDICT_QSORT
# if defined(__APPLE__)
# define ZDICT_QSORT ZDICT_QSORT_APPLE /* uses qsort_r() with a different order for parameters */
# elif defined(_GNU_SOURCE)
# elif (defined(__linux__) && !defined(__ANDROID__)) || defined(__CYGWIN__) || defined(__MSYS__)
# define ZDICT_QSORT ZDICT_QSORT_GNU /* uses qsort_r() */
# elif defined(_WIN32) && defined(_MSC_VER)
# define ZDICT_QSORT ZDICT_QSORT_MSVC /* uses qsort_s() with a different order for parameters */