1 # btowc.m4 serial 3
2 dnl Copyright (C) 2008 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],
8 [
9 AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
11 AC_CHECK_FUNCS_ONCE([btowc])
12 if test $ac_cv_func_btowc = no; then
13 HAVE_BTOWC=0
14 else
16 dnl IRIX 6.5 btowc(EOF) is 0xFF, not WEOF.
17 AC_REQUIRE([AC_PROG_CC])
18 AC_REQUIRE([gt_LOCALE_FR])
19 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
20 AC_CACHE_CHECK([whether btowc(EOF) is correct],
21 [gl_cv_func_btowc_eof],
22 [
23 dnl Initial guess, used when cross-compiling or when no suitable locale
24 dnl is present.
25 changequote(,)dnl
26 case "$host_os" in
27 # Guess no on IRIX.
28 irix*) gl_cv_func_btowc_eof="guessing no" ;;
29 # Guess yes otherwise.
30 *) gl_cv_func_btowc_eof="guessing yes" ;;
31 esac
32 changequote([,])dnl
33 if test $LOCALE_FR != none; then
34 AC_TRY_RUN([
35 #include <locale.h>
36 #include <stdio.h>
37 #include <string.h>
38 #include <wchar.h>
39 int main ()
40 {
41 if (setlocale (LC_ALL, "$LOCALE_FR") != NULL)
42 {
43 if (btowc (EOF) != WEOF)
44 return 1;
45 }
46 return 0;
47 }],
48 [gl_cv_func_btowc_eof=yes],
49 [gl_cv_func_btowc_eof=no],
50 [])
51 fi
52 ])
53 case "$gl_cv_func_btowc_eof" in
54 *yes) ;;
55 *) REPLACE_BTOWC=1 ;;
56 esac
57 fi
58 if test $HAVE_BTOWC = 0 || test $REPLACE_BTOWC = 1; then
59 gl_REPLACE_WCHAR_H
60 AC_LIBOBJ([btowc])
61 gl_PREREQ_BTOWC
62 fi
63 ])
65 # Prerequisites of lib/btowc.c.
66 AC_DEFUN([gl_PREREQ_BTOWC], [
67 :
68 ])