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-rw-r--r--m4/mbswidth.m437
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diff --git a/m4/mbswidth.m4 b/m4/mbswidth.m4
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+# mbswidth.m4 serial 19
+dnl Copyright (C) 2000-2002, 2004, 2006-2022 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl autoconf tests required for use of mbswidth.c
+dnl From Bruno Haible.
+
+AC_DEFUN([gl_MBSWIDTH],
+[
+ AC_CHECK_HEADERS_ONCE([wchar.h])
+ AC_CHECK_FUNCS_ONCE([isascii mbsinit])
+
+ dnl UnixWare 7.1.1 <wchar.h> has a declaration of a function mbswidth()
+ dnl that clashes with ours.
+ AC_CACHE_CHECK([whether mbswidth is declared in <wchar.h>],
+ [ac_cv_have_decl_mbswidth],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <wchar.h>
+ ]],
+ [[char *p = (char *) mbswidth;
+ return !p;
+ ]])],
+ [ac_cv_have_decl_mbswidth=yes],
+ [ac_cv_have_decl_mbswidth=no])])
+ if test $ac_cv_have_decl_mbswidth = yes; then
+ ac_val=1
+ else
+ ac_val=0
+ fi
+ AC_DEFINE_UNQUOTED([HAVE_DECL_MBSWIDTH_IN_WCHAR_H], [$ac_val],
+ [Define to 1 if you have a declaration of mbswidth() in <wchar.h>, and to 0 otherwise.])
+
+ AC_TYPE_MBSTATE_T
+])