1# wctob.m4 serial 10
2dnl Copyright (C) 2008-2014 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7AC_DEFUN([gl_FUNC_WCTOB],
8[
9  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
10
11  AC_CHECK_FUNCS_ONCE([wctob])
12  if test $ac_cv_func_wctob = no; then
13    HAVE_WCTOB=0
14    HAVE_DECL_WCTOB=0
15  else
16    HAVE_WCTOB=1
17
18    dnl Solaris 9 has the wctob() function but it does not work.
19    dnl Cygwin 1.7.2 has the wctob() function but it clobbers caller-owned
20    dnl registers, see <http://cygwin.com/ml/cygwin/2010-05/msg00015.html>.
21    AC_REQUIRE([AC_PROG_CC])
22    AC_REQUIRE([gt_LOCALE_FR])
23    AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
24    AC_CACHE_CHECK([whether wctob works],
25      [gl_cv_func_wctob_works],
26      [
27        dnl Initial guess, used when cross-compiling or when no suitable locale
28        dnl is present.
29changequote(,)dnl
30        case "$host_os" in
31            # Guess no on Solaris <= 9 and Cygwin.
32          solaris2.[1-9] | solaris2.[1-9].* | cygwin*)
33            gl_cv_func_wctob_works="guessing no" ;;
34            # Guess yes otherwise.
35          *) gl_cv_func_wctob_works="guessing yes" ;;
36        esac
37changequote([,])dnl
38        case "$host_os" in
39          cygwin*)
40            AC_RUN_IFELSE(
41              [AC_LANG_SOURCE([[
42#include <locale.h>
43/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
44   <wchar.h>.
45   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
46   included before <wchar.h>.  */
47#include <stddef.h>
48#include <stdio.h>
49#include <time.h>
50#include <wchar.h>
51
52register long global __asm__ ("%ebx");
53
54int main ()
55{
56  setlocale (LC_ALL, "en_US.UTF-8");
57
58  global = 0x12345678;
59  if (wctob (0x00FC) != -1)
60    return 1;
61  if (global != 0x12345678)
62    return 2;
63  return 0;
64}]])],
65              [:],
66              [gl_cv_func_wctob_works=no],
67              [:])
68            ;;
69        esac
70        if test "$gl_cv_func_wctob_works" != no && test $LOCALE_FR != none; then
71          AC_RUN_IFELSE(
72            [AC_LANG_SOURCE([[
73#include <locale.h>
74#include <string.h>
75/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
76   <wchar.h>.
77   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
78   included before <wchar.h>.  */
79#include <stddef.h>
80#include <stdio.h>
81#include <time.h>
82#include <wchar.h>
83int main ()
84{
85  if (setlocale (LC_ALL, "$LOCALE_FR") != NULL)
86    {
87      wchar_t wc;
88
89      if (mbtowc (&wc, "\374", 1) == 1)
90        if (wctob (wc) != (unsigned char) '\374')
91          return 1;
92    }
93  return 0;
94}]])],
95            [gl_cv_func_wctob_works=yes],
96            [gl_cv_func_wctob_works=no],
97            [:])
98        fi
99      ])
100    case "$gl_cv_func_wctob_works" in
101      *yes) ;;
102      *) REPLACE_WCTOB=1 ;;
103    esac
104    if test $REPLACE_WCTOB = 0; then
105
106      dnl IRIX 6.5 has the wctob() function but does not declare it.
107      AC_CHECK_DECLS([wctob], [], [], [[
108/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
109   <wchar.h>.
110   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included
111   before <wchar.h>.  */
112#include <stddef.h>
113#include <stdio.h>
114#include <time.h>
115#include <wchar.h>
116]])
117      if test $ac_cv_have_decl_wctob != yes; then
118        HAVE_DECL_WCTOB=0
119      fi
120    fi
121  fi
122])
123
124# Prerequisites of lib/wctob.c.
125AC_DEFUN([gl_PREREQ_WCTOB], [
126  :
127])
128