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dnl Copyright (C) 2008-2010 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_WCRTOMB],
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AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
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AC_REQUIRE([AC_TYPE_MBSTATE_T])
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AC_CHECK_FUNCS_ONCE([wcrtomb])
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if test $ac_cv_func_wcrtomb = no; then
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if test $REPLACE_MBSTATE_T = 1; then
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dnl On AIX 4.3, OSF/1 5.1 and Solaris 10, wcrtomb (NULL, 0, NULL) sometimes
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dnl returns 0 instead of 1.
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AC_REQUIRE([AC_PROG_CC])
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AC_REQUIRE([gt_LOCALE_FR])
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AC_REQUIRE([gt_LOCALE_FR_UTF8])
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AC_REQUIRE([gt_LOCALE_JA])
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AC_REQUIRE([gt_LOCALE_ZH_CN])
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CACHE_CHECK([whether wcrtomb return value is correct],
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[gl_cv_func_wcrtomb_retval],
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dnl Initial guess, used when cross-compiling or when no suitable locale
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# Guess no on AIX 4, OSF/1 and Solaris.
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aix4* | osf* | solaris*) gl_cv_func_wcrtomb_retval="guessing no" ;;
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# Guess yes otherwise.
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*) gl_cv_func_wcrtomb_retval="guessing yes" ;;
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if test $LOCALE_FR != none || test $LOCALE_FR_UTF8 != none || test $LOCALE_JA != none || test $LOCALE_ZH_CN != none; then
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if (setlocale (LC_ALL, "$LOCALE_FR") != NULL)
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if (wcrtomb (NULL, 0, NULL) != 1)
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if (setlocale (LC_ALL, "$LOCALE_FR_UTF8") != NULL)
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if (wcrtomb (NULL, 0, NULL) != 1)
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if (setlocale (LC_ALL, "$LOCALE_JA") != NULL)
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if (wcrtomb (NULL, 0, NULL) != 1)
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if (setlocale (LC_ALL, "$LOCALE_ZH_CN") != NULL)
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if (wcrtomb (NULL, 0, NULL) != 1)
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[gl_cv_func_wcrtomb_retval=yes],
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[gl_cv_func_wcrtomb_retval=no],
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case "$gl_cv_func_wcrtomb_retval" in
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*) REPLACE_WCRTOMB=1 ;;
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if test $HAVE_WCRTOMB = 0 || test $REPLACE_WCRTOMB = 1; then
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# Prerequisites of lib/wcrtomb.c.
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AC_DEFUN([gl_PREREQ_WCRTOMB], [