New files, from GNU gettext and GNU coreutils.

m4/mbswidth.m4

@@ -0,0 +1,36 @@
+#serial 7
+
+dnl autoconf tests required for use of mbswidth.c
+dnl From Bruno Haible.
+
+AC_DEFUN([jm_PREREQ_MBSWIDTH],
+[
+  AC_REQUIRE([AC_HEADER_STDC])
+  AC_CHECK_HEADERS(limits.h stdlib.h string.h wchar.h wctype.h)
+  AC_CHECK_FUNCS(isascii iswcntrl iswprint mbsinit wcwidth)
+  jm_FUNC_MBRTOWC
+
+  AC_CACHE_CHECK([whether wcwidth is declared], ac_cv_have_decl_wcwidth,
+    [AC_TRY_COMPILE([
+/* AIX 3.2.5 declares wcwidth in <string.h>. */
+#if HAVE_STRING_H
+# include <string.h>
+#endif
+#if HAVE_WCHAR_H
+# include <wchar.h>
+#endif
+], [
+#ifndef wcwidth
+  char *p = (char *) wcwidth;
+#endif
+], ac_cv_have_decl_wcwidth=yes, ac_cv_have_decl_wcwidth=no)])
+  if test $ac_cv_have_decl_wcwidth = yes; then
+    ac_val=1
+  else
+    ac_val=0
+  fi
+  AC_DEFINE_UNQUOTED(HAVE_DECL_WCWIDTH, $ac_val,
+    [Define to 1 if you have the declaration of wcwidth(), and to 0 otherwise.])
+
+  AC_TYPE_MBSTATE_T
+])