1# wcwidth.m4 serial 16
2dnl Copyright (C) 2006-2010 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_WCWIDTH],
8[
9  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
10  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
11
12  dnl Persuade glibc <wchar.h> to declare wcwidth().
13  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
14
15  AC_REQUIRE([gt_TYPE_WCHAR_T])
16  AC_REQUIRE([gt_TYPE_WINT_T])
17
18  AC_CHECK_HEADERS_ONCE([wchar.h])
19  AC_CHECK_FUNCS_ONCE([wcwidth])
20
21  AC_CHECK_DECLS([wcwidth], [], [], [
22/* AIX 3.2.5 declares wcwidth in <string.h>. */
23#include <string.h>
24/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
25   <wchar.h>.
26   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included
27   before <wchar.h>.  */
28#include <stddef.h>
29#include <stdio.h>
30#include <time.h>
31#include <wchar.h>
32])
33  if test $ac_cv_have_decl_wcwidth != yes; then
34    HAVE_DECL_WCWIDTH=0
35  fi
36
37  if test $ac_cv_func_wcwidth = yes; then
38    dnl On MacOS X 10.3, wcwidth(0x0301) (COMBINING ACUTE ACCENT) returns 1.
39    dnl On OSF/1 5.1, wcwidth(0x200B) (ZERO WIDTH SPACE) returns 1.
40    dnl This leads to bugs in 'ls' (coreutils).
41    AC_CACHE_CHECK([whether wcwidth works reasonably in UTF-8 locales],
42      [gl_cv_func_wcwidth_works],
43      [
44        AC_TRY_RUN([
45#include <locale.h>
46/* AIX 3.2.5 declares wcwidth in <string.h>. */
47#include <string.h>
48/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
49   <wchar.h>.
50   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included
51   before <wchar.h>.  */
52#include <stddef.h>
53#include <stdio.h>
54#include <time.h>
55#include <wchar.h>
56#if !HAVE_DECL_WCWIDTH
57extern
58# ifdef __cplusplus
59"C"
60# endif
61int wcwidth (int);
62#endif
63int main ()
64{
65  if (setlocale (LC_ALL, "fr_FR.UTF-8") != NULL)
66    if (wcwidth (0x0301) > 0 || wcwidth (0x200B) > 0)
67      return 1;
68  return 0;
69}], [gl_cv_func_wcwidth_works=yes], [gl_cv_func_wcwidth_works=no],
70          [
71changequote(,)dnl
72           case "$host_os" in
73                     # Guess yes on glibc systems.
74             *-gnu*) gl_cv_func_wcwidth_works="guessing yes";;
75             *)      gl_cv_func_wcwidth_works="guessing no";;
76           esac
77changequote([,])dnl
78          ])
79      ])
80    case "$gl_cv_func_wcwidth_works" in
81      *yes) ;;
82      *no) REPLACE_WCWIDTH=1 ;;
83    esac
84  fi
85  if test $ac_cv_func_wcwidth != yes || test $REPLACE_WCWIDTH = 1; then
86    AC_LIBOBJ([wcwidth])
87  fi
88  if test $ac_cv_func_wcwidth != yes || test $REPLACE_WCWIDTH = 1 \
89     || test $HAVE_DECL_WCWIDTH = 0; then
90    gl_REPLACE_WCHAR_H
91  fi
92  dnl We don't substitute HAVE_WCWIDTH. We assume that if the system does not
93  dnl have the wcwidth function, then it does not declare it.
94])
95