dnl A placeholder for ISO C99 <wchar.h>, for platforms that have issues.
-dnl Copyright (C) 2007-2009 Free Software Foundation, Inc.
+dnl Copyright (C) 2007-2010 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 Written by Eric Blake.
-# wchar.m4 serial 28
+# wchar.m4 serial 31
AC_DEFUN([gl_WCHAR_H],
[
AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
AC_REQUIRE([gl_WCHAR_H_INLINE_OK])
- AC_CACHE_CHECK([whether <wchar.h> is standalone],
- [gl_cv_header_wchar_h_standalone],
- [AC_COMPILE_IFELSE([[#include <wchar.h>
-wchar_t w;]],
- [gl_cv_header_wchar_h_standalone=yes],
- [gl_cv_header_wchar_h_standalone=no])])
-
- AC_REQUIRE([gt_TYPE_WINT_T])
- if test $gt_cv_c_wint_t = yes; then
- HAVE_WINT_T=1
- else
- HAVE_WINT_T=0
- fi
- AC_SUBST([HAVE_WINT_T])
-
- dnl If <stddef.h> is replaced, then <wchar.h> must also be replaced.
- AC_REQUIRE([gl_STDDEF_H])
-
dnl Prepare for creating substitute <wchar.h>.
- dnl Do it always: WCHAR_H may be empty here but can be set later.
dnl Check for <wchar.h> (missing in Linux uClibc when built without wide
dnl character support).
+ dnl <wchar.h> is always overridden, because of GNULIB_POSIXCHECK.
AC_CHECK_HEADERS_ONCE([wchar.h])
+ gl_CHECK_NEXT_HEADERS([wchar.h])
if test $ac_cv_header_wchar_h = yes; then
HAVE_WCHAR_H=1
else
HAVE_WCHAR_H=0
fi
AC_SUBST([HAVE_WCHAR_H])
- dnl Execute this unconditionally, because WCHAR_H may be set by other
- dnl modules, after this code is executed.
- gl_CHECK_NEXT_HEADERS([wchar.h])
+
+ AC_REQUIRE([gt_TYPE_WINT_T])
+ if test $gt_cv_c_wint_t = yes; then
+ HAVE_WINT_T=1
+ else
+ HAVE_WINT_T=0
+ fi
+ AC_SUBST([HAVE_WINT_T])
+
+ dnl Check for declarations of anything we want to poison if the
+ dnl corresponding gnulib module is not in use.
+ gl_WARN_ON_USE_PREPARE([[
+/* Some systems require additional headers. */
+#ifndef __GLIBC__
+# include <stddef.h>
+# include <stdio.h>
+# include <time.h>
+#endif
+#include <wchar.h>
+ ]], [btowc wctob mbsinit mbrtowc mbrlen mbsrtowcs mbsnrtowcs wcrtomb
+ wcsrtombs wcsnrtombs wcwidth])
])
dnl Check whether <wchar.h> is usable at all.
dnl Unconditionally enables the replacement of <wchar.h>.
AC_DEFUN([gl_REPLACE_WCHAR_H],
[
- AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
+ dnl This is a no-op, because <wchar.h> is always overridden.
:
])