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dnl Reentrant sort function.
dnl Copyright 2014-2021 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl Written by Paul Eggert.
AC_DEFUN([gl_FUNC_QSORT_R],
[
dnl Persuade glibc to declare qsort_r.
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
AC_CHECK_FUNCS_ONCE([qsort_r])
if test $ac_cv_func_qsort_r = yes; then
AC_CACHE_CHECK([for qsort_r signature], [gl_cv_qsort_r_signature],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[#include <stdlib.h>
void qsort_r (void *, size_t, size_t,
int (*) (void const *, void const *,
void *),
void *);
void (*p) (void *, size_t, size_t,
int (*) (void const *, void const *,
void *),
void *) = qsort_r;
]])],
[gl_cv_qsort_r_signature=GNU],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[#include <stdlib.h>
void qsort_r (void *, size_t, size_t, void *,
int (*) (void *,
void const *,
void const *));
void (*p) (void *, size_t, size_t, void *,
int (*) (void *, void const *,
void const *)) = qsort_r;
]])],
[gl_cv_qsort_r_signature=BSD],
[gl_cv_qsort_r_signature=unknown])])])
case $gl_cv_qsort_r_signature in
GNU) ;;
BSD) REPLACE_QSORT_R=1 ;;
unknown) HAVE_QSORT_R=0 REPLACE_QSORT_R=1 ;;
esac
else
HAVE_QSORT_R=0
fi
])
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