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# tsearch.m4 serial 7
dnl Copyright (C) 2006-2018 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.
AC_DEFUN([gl_FUNC_TSEARCH],
[
AC_REQUIRE([gl_SEARCH_H_DEFAULTS])
AC_CHECK_FUNCS([tsearch])
if test $ac_cv_func_tsearch = yes; then
dnl On OpenBSD 4.0, the return value of tdelete() is incorrect.
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether tdelete works], [gl_cv_func_tdelete_works],
[
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stddef.h>
#include <search.h>
static int
cmp_fn (const void *a, const void *b)
{
return *(const int *) a - *(const int *) b;
}
int
main ()
{
int result = 0;
int x = 0;
void *root = NULL;
if (!(tfind (&x, &root, cmp_fn) == NULL))
result |= 1;
tsearch (&x, &root, cmp_fn);
if (!(tfind (&x, &root, cmp_fn) != NULL))
result |= 2;
if (!(tdelete (&x, &root, cmp_fn) != NULL))
result |= 4;
return result;
}]])], [gl_cv_func_tdelete_works=yes], [gl_cv_func_tdelete_works=no],
[case "$host_os" in
openbsd*) gl_cv_func_tdelete_works="guessing no" ;;
# Guess yes on native Windows.
mingw*) gl_cv_func_tdelete_works="guessing yes" ;;
*) gl_cv_func_tdelete_works="guessing yes" ;;
esac
])
])
case "$gl_cv_func_tdelete_works" in
*no)
REPLACE_TSEARCH=1
;;
esac
else
HAVE_TSEARCH=0
fi
])
# Prerequisites of lib/tsearch.c.
AC_DEFUN([gl_PREREQ_TSEARCH], [
:
])
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