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# memset_explicit.m4
# serial 4
dnl Copyright 2022-2025 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 This file is offered as-is, without any warranty.
AC_DEFUN([gl_FUNC_MEMSET_EXPLICIT],
[
AC_REQUIRE([gl_STRING_H_DEFAULTS])
dnl Persuade OpenSolaris derivatives' <string.h> to declare memset_s().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
gl_CHECK_FUNCS_ANDROID([memset_explicit], [[#include <string.h>]])
if test $ac_cv_func_memset_explicit = no; then
HAVE_MEMSET_EXPLICIT=0
case "$gl_cv_onwards_func_memset_explicit" in
future*) REPLACE_MEMSET_EXPLICIT=1 ;;
esac
fi
])
AC_DEFUN([gl_PREREQ_MEMSET_EXPLICIT],
[
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CHECK_FUNCS([explicit_memset])
AC_CHECK_FUNCS_ONCE([memset_s])
if test $ac_cv_func_memset_s = yes; then
AC_CACHE_CHECK([for working memset_s],
[gl_cv_func_memset_s_works],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <string.h>
#include <stddef.h>
]], [[
(void) memset_s (NULL, 0, '?', 0);
]])
],
[gl_cv_func_memset_s_works=yes],
[gl_cv_func_memset_s_works=no],
[case "$host_os" in
# Guess no on Solaris.
solaris*)
gl_cv_func_memset_s_works="guessing no" ;;
*)
gl_cv_func_memset_s_works="guessing yes" ;;
esac
])
])
case "$gl_cv_func_memset_s_works" in
*yes)
AC_DEFINE([HAVE_MEMSET_S_SUPPORTS_ZERO], [1],
[Define to 1 if memset_s support zero-length operations.])
;;
esac
fi
])
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