acinclude.m4 2.27 KB
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dnl $Id: acinclude.m4,v 1.8 2002/10/02 07:23:06 ceder Exp $
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dnl Copyright (C) 1994-1995, 1998-1999, 2001-2002  Lysator Academic Computer Association.
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dnl
dnl This file is part of the LysKOM server.
dnl 
dnl LysKOM is free software; you can redistribute it and/or modify it
dnl under the terms of the GNU General Public License as published by 
dnl the Free Software Foundation; either version 1, or (at your option) 
dnl any later version.
dnl 
dnl LysKOM is distributed in the hope that it will be useful, but WITHOUT
dnl ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
dnl FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
dnl for more details.
dnl 
dnl You should have received a copy of the GNU General Public License
dnl along with LysKOM; see the file COPYING.  If not, write to
dnl Lysator, c/o ISY, Linkoping University, S-581 83 Linkoping, SWEDEN,
dnl or the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, 
dnl MA 02139, USA.
dnl
dnl Please mail bug reports to bug-lyskom@lysator.liu.se. 
dnl

dnl
dnl Check if an option is acceptable to the C compiler in use.
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dnl (This is taken verbatim from cmod 1.2.  Please don't make even a
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dnl tiny change to it unless you change the name of all variables!
dnl See the cmod source code for more information.)
dnl
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AC_DEFUN([CMOD_CHECK_CC_OPT],
[AC_MSG_CHECKING([whether ${CC} accepts $1])
AC_CACHE_VAL([cmod_cv_compiler_]$2,
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[[cmod_oldflags=$CFLAGS
CFLAGS="$CFLAGS $1"]
AC_TRY_LINK(,,
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	[cmod_cv_compiler_]$2[=yes],
	[cmod_cv_compiler_]$2[=no])
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[CFLAGS=$cmod_oldflags]])dnl
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AC_MSG_RESULT([$cmod_cv_compiler_]$2)
if test [$cmod_cv_compiler_]$2 = yes; then
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  CFLAGS="$CFLAGS $1"
fi])dnl
dnl
dnl Another frozen defun.
dnl
AC_DEFUN(CMOD_C_ATTRIBUTE_UNUSED,
[AC_MSG_CHECKING([whether $CC understands __attribute__((unused))])
AC_CACHE_VAL([cmod_cv_c_attribute_unused_understood],
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    AC_TRY_COMPILE([int foo(int *i __attribute__((unused))) { *i = 4711; }],
		   [int i __attribute__((unused));],
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	[cmod_cv_c_attribute_unused_understood=yes],
	[cmod_cv_c_attribute_unused_understood=no]))
AC_MSG_RESULT($cmod_cv_c_attribute_unused_understood)
[if test $cmod_cv_c_attribute_unused_understood = yes ; then]
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    AC_DEFINE([HAVE_ATTRIBUTE_UNUSED], 1, 
	      [Define if your compiler supports __attribute__ ((unused)).])
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[fi]])dnl