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# memcmp.m4 serial 16
dnl Copyright (C) 2002-2004, 2007-2023 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_MEMCMP],
[
dnl We don't use AC_FUNC_MEMCMP any more, because it is no longer maintained
dnl in Autoconf and because it invokes AC_LIBOBJ.
AC_CACHE_CHECK([for working memcmp], [gl_cv_func_memcmp_working],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[AC_INCLUDES_DEFAULT],
[[/* Some versions of memcmp are not 8-bit clean. */
char c0 = '\100', c1 = '\200', c2 = '\201';
if (memcmp(&c0, &c2, 1) >= 0 || memcmp(&c1, &c2, 1) >= 0)
return 1;
/* The Next x86 OpenStep bug shows up only when comparing 16 bytes
or more and with at least one buffer not starting on a 4-byte
boundary. William Lewis provided this test program. */
{
char foo[21];
char bar[21];
int i;
for (i = 0; i < 4; i++)
{
char *a = foo + i;
char *b = bar + i;
strcpy (a, "--------01111111");
strcpy (b, "--------10000000");
if (memcmp (a, b, 16) >= 0)
return 1;
}
return 0;
}
]])],
[gl_cv_func_memcmp_working=yes],
[gl_cv_func_memcmp_working=no],
[dnl When cross-compiling, guess memcmp works when it exists.
dnl This is useful for mingw.
AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <string.h>]],
[[int ret = memcmp ("foo", "bar", 0);]])],
[gl_cv_func_memcmp_working="guessing yes"],
[gl_cv_func_memcmp_working="guessing no"])
])
])
case "$gl_cv_func_memcmp_working" in
*yes) gl_func_memcmp=yes ;;
*) gl_func_memcmp=no ;;
esac
if test $gl_func_memcmp = no; then
AC_DEFINE([memcmp], [rpl_memcmp],
[Define to rpl_memcmp if the replacement function should be used.])
fi
])
# Prerequisites of lib/memcmp.c.
AC_DEFUN([gl_PREREQ_MEMCMP], [:])
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