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      1 # wcwidth.m4 serial 23
      2 dnl Copyright (C) 2006-2012 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.
      6 
      7 AC_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 $ac_cv_func_wcwidth = yes; then
     38     HAVE_WCWIDTH=1
     39     dnl On Mac OS X 10.3, wcwidth(0x0301) (COMBINING ACUTE ACCENT) returns 1.
     40     dnl On OpenBSD 5.0, wcwidth(0x05B0) (HEBREW POINT SHEVA) returns 1.
     41     dnl On OSF/1 5.1, wcwidth(0x200B) (ZERO WIDTH SPACE) returns 1.
     42     dnl This leads to bugs in 'ls' (coreutils).
     43     AC_CACHE_CHECK([whether wcwidth works reasonably in UTF-8 locales],
     44       [gl_cv_func_wcwidth_works],
     45       [
     46         AC_RUN_IFELSE(
     47           [AC_LANG_SOURCE([[
     48 #include <locale.h>
     49 /* AIX 3.2.5 declares wcwidth in <string.h>. */
     50 #include <string.h>
     51 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
     52    <wchar.h>.
     53    BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included
     54    before <wchar.h>.  */
     55 #include <stddef.h>
     56 #include <stdio.h>
     57 #include <time.h>
     58 #include <wchar.h>
     59 #if !HAVE_DECL_WCWIDTH
     60 extern
     61 # ifdef __cplusplus
     62 "C"
     63 # endif
     64 int wcwidth (int);
     65 #endif
     66 int main ()
     67 {
     68   int result = 0;
     69   if (setlocale (LC_ALL, "fr_FR.UTF-8") != NULL)
     70     {
     71       if (wcwidth (0x0301) > 0)
     72         result |= 1;
     73       if (wcwidth (0x05B0) > 0)
     74         result |= 2;
     75       if (wcwidth (0x200B) > 0)
     76         result |= 4;
     77     }
     78   return result;
     79 }]])],
     80           [gl_cv_func_wcwidth_works=yes],
     81           [gl_cv_func_wcwidth_works=no],
     82           [
     83 changequote(,)dnl
     84            case "$host_os" in
     85                      # Guess yes on glibc and AIX 7 systems.
     86              *-gnu* | aix[7-9]*) gl_cv_func_wcwidth_works="guessing yes";;
     87              *)                  gl_cv_func_wcwidth_works="guessing no";;
     88            esac
     89 changequote([,])dnl
     90           ])
     91       ])
     92     case "$gl_cv_func_wcwidth_works" in
     93       *yes) ;;
     94       *no) REPLACE_WCWIDTH=1 ;;
     95     esac
     96   else
     97     HAVE_WCWIDTH=0
     98   fi
     99   dnl We don't substitute HAVE_WCWIDTH. We assume that if the system does not
    100   dnl have the wcwidth function, then it does not declare it.
    101 ])
    102