Merge commit '752be95a475132506c35922d284884cf776149d0' into vm-check
[bpt/guile.git] / m4 / mbstate_t.m4
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4a462e35 1# mbstate_t.m4 serial 11
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2dnl Copyright (C) 2000-2002, 2008 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
7# From Paul Eggert.
8
9# BeOS 5 has <wchar.h> but does not define mbstate_t,
10# so you can't declare an object of that type.
11# Check for this incompatibility with Standard C.
12
13# AC_TYPE_MBSTATE_T
14# -----------------
15AC_DEFUN([AC_TYPE_MBSTATE_T],
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16[
17 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) dnl for HP-UX 11.11
18
19 AC_CACHE_CHECK([for mbstate_t], ac_cv_type_mbstate_t,
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20 [AC_COMPILE_IFELSE(
21 [AC_LANG_PROGRAM(
22 [AC_INCLUDES_DEFAULT[
23# include <wchar.h>]],
24 [[mbstate_t x; return sizeof x;]])],
25 [ac_cv_type_mbstate_t=yes],
26 [ac_cv_type_mbstate_t=no])])
27 if test $ac_cv_type_mbstate_t = yes; then
28 AC_DEFINE([HAVE_MBSTATE_T], 1,
29 [Define to 1 if <wchar.h> declares mbstate_t.])
30 else
31 AC_DEFINE([mbstate_t], int,
32 [Define to a type if <wchar.h> does not define.])
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33 fi
34])