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# c32rtomb.m4 serial 1
dnl Copyright (C) 2020 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_C32RTOMB],
[
AC_REQUIRE([gl_UCHAR_H_DEFAULTS])
AC_REQUIRE([gl_MBRTOC32_SANITYCHECK])
AC_CHECK_FUNCS_ONCE([c32rtomb])
if test $ac_cv_func_c32rtomb = no; then
HAVE_C32RTOMB=0
else
dnl When we override mbrtoc32, redefining the meaning of the char32_t
dnl values, we need to override c32rtomb as well, for consistency.
if test $HAVE_WORKING_MBRTOC32 = 0; then
REPLACE_C32RTOMB=1
fi
AC_CACHE_CHECK([whether c32rtomb return value is correct],
[gl_cv_func_c32rtomb_retval],
[
dnl Initial guess, used when cross-compiling.
changequote(,)dnl
case "$host_os" in
# Guess no on AIX.
aix*) gl_cv_func_c32rtomb_retval="guessing no" ;;
# Guess yes otherwise.
*) gl_cv_func_c32rtomb_retval="guessing yes" ;;
esac
changequote([,])dnl
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <uchar.h>
int main ()
{
int result = 0;
if (c32rtomb (NULL, 0, NULL) != 1)
result |= 1;
return result;
}]])],
[gl_cv_func_c32rtomb_retval=yes],
[gl_cv_func_c32rtomb_retval=no],
[:])
])
case "$gl_cv_func_c32rtomb_retval" in
*yes) ;;
*) AC_DEFINE([C32RTOMB_RETVAL_BUG], [1],
[Define if the wcrtomb function has an incorrect return value.])
REPLACE_C32RTOMB=1 ;;
esac
fi
])
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