2 dnl Copyright (C) 2008-2010 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_BTOWC],
9 AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
11 dnl Check whether <wchar.h> is usable at all, first. Otherwise the test
12 dnl program below may lead to an endless loop. See
13 dnl <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42440>.
14 AC_REQUIRE([gl_WCHAR_H_INLINE_OK])
16 AC_CHECK_FUNCS_ONCE([btowc])
17 if test $ac_cv_func_btowc = no; then
21 AC_REQUIRE([AC_PROG_CC])
22 AC_REQUIRE([gt_LOCALE_FR])
23 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
25 dnl Cygwin 1.7.2 btowc('\0') is WEOF, not 0.
26 AC_CACHE_CHECK([whether btowc(0) is correct],
27 [gl_cv_func_btowc_nul],
35 if (btowc ('\0') != 0)
39 [gl_cv_func_btowc_nul=yes],
40 [gl_cv_func_btowc_nul=no],
45 cygwin*) gl_cv_func_btowc_nul="guessing no" ;;
46 # Guess yes otherwise.
47 *) gl_cv_func_btowc_nul="guessing yes" ;;
53 dnl IRIX 6.5 btowc(EOF) is 0xFF, not WEOF.
54 AC_CACHE_CHECK([whether btowc(EOF) is correct],
55 [gl_cv_func_btowc_eof],
57 dnl Initial guess, used when cross-compiling or when no suitable locale
62 irix*) gl_cv_func_btowc_eof="guessing no" ;;
63 # Guess yes otherwise.
64 *) gl_cv_func_btowc_eof="guessing yes" ;;
67 if test $LOCALE_FR != none; then
75 if (setlocale (LC_ALL, "$LOCALE_FR") != NULL)
77 if (btowc (EOF) != WEOF)
82 [gl_cv_func_btowc_eof=yes],
83 [gl_cv_func_btowc_eof=no],
88 case "$gl_cv_func_btowc_nul" in
92 case "$gl_cv_func_btowc_eof" in
97 if test $HAVE_BTOWC = 0 || test $REPLACE_BTOWC = 1; then
104 # Prerequisites of lib/btowc.c.
105 AC_DEFUN([gl_PREREQ_BTOWC], [