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# wmemcmp.m4 serial 6
dnl Copyright (C) 2011-2023 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_WMEMCMP],
[
AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST])
dnl We cannot use AC_CHECK_FUNCS here, because the MSVC 9 header files
dnl provide this function as an inline function definition.
AC_CACHE_CHECK([for wmemcmp], [gl_cv_func_wmemcmp],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <wchar.h>
]],
[[return ! wmemcmp ((const wchar_t *) 0, (const wchar_t *) 0, 0);]])
],
[gl_cv_func_wmemcmp=yes],
[gl_cv_func_wmemcmp=no])
])
if test $gl_cv_func_wmemcmp = no; then
HAVE_WMEMCMP=0
else
AC_CACHE_CHECK([whether wmemcmp works for all wide characters],
[gl_cv_func_wmemcmp_works],
[AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <wchar.h>
int main ()
{
wchar_t a = (wchar_t) 0x76547654;
wchar_t b = (wchar_t) 0x9abc9abc;
int cmp = wmemcmp (&a, &b, 1);
if ((wchar_t)-1 < 0)
return !(cmp > 0);
else
return !(cmp < 0);
}
]])
],
[gl_cv_func_wmemcmp_works=yes],
[gl_cv_func_wmemcmp_works=no],
[case "$host_on" in
# Guess no on glibc versions < 2.15.
*-gnu* | gnu*)
AC_EGREP_CPP([Unlucky],
[
#include <features.h>
#ifdef __GNU_LIBRARY__
#if (__GLIBC__ == 2 && __GLIBC_MINOR__ < 15)
Unlucky GNU user
#endif
#endif
],
[gl_cv_func_wmemcmp_works="guessing no"],
[gl_cv_func_wmemcmp_works="guessing yes"])
;;
# Guess no on musl systems.
*-musl* | midipix*) gl_cv_func_wmemcmp_works="guessing no" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_wmemcmp_works="$gl_cross_guess_normal" ;;
esac
])
])
case "$gl_cv_func_wmemcmp_works" in
*yes) ;;
*) REPLACE_WMEMCMP=1 ;;
esac
fi
])
|
