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# ===========================================================================
# http://autoconf-archive.cryp.to/ac_check_typedef.html
# ===========================================================================
#
# SYNOPSIS
#
# AC_CHECK_TYPEDEF(TYPEDEF, HEADER [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND ]])
#
# DESCRIPTION
#
# Check if the given typedef-name is recognized as a type. The trick is to
# use a sizeof(TYPEDEF) and see if the compiler is happy with that.
#
# This can be thought of as a mixture of AC_CHECK_TYPE(TYPEDEF,DEFAULT)
# and AC_CHECK_LIB(LIBRARY,FUNCTION,ACTION-IF-FOUND,ACTION-IF-NOT-FOUND).
#
# A convenience macro AC_CHECK_TYPEDEF_ is provided that will not emit any
# message to the user - it just executes one of the actions.
#
# LICENSE
#
# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
AC_DEFUN([AC_CHECK_TYPEDEF_],
[dnl
ac_lib_var=`echo $1['_']$2 | sed 'y%./+-%__p_%'`
AC_CACHE_VAL(ac_cv_lib_$ac_lib_var,
[ eval "ac_cv_type_$ac_lib_var='not-found'"
ac_cv_check_typedef_header=`echo ifelse([$2], , stddef.h, $2)`
AC_TRY_COMPILE( [#include <$ac_cv_check_typedef_header>],
[int x = sizeof($1); x = x;],
eval "ac_cv_type_$ac_lib_var=yes" ,
eval "ac_cv_type_$ac_lib_var=no" )
if test `eval echo '$ac_cv_type_'$ac_lib_var` = "no" ; then
ifelse([$4], , :, $4)
else
ifelse([$3], , :, $3)
fi
])])
dnl AC_CHECK_TYPEDEF(TYPEDEF, HEADER [, ACTION-IF-FOUND,
dnl [, ACTION-IF-NOT-FOUND ]])
AC_DEFUN([AC_CHECK_TYPEDEF],
[dnl
AC_MSG_CHECKING([for $1 in $2])
AC_CHECK_TYPEDEF_($1,$2,AC_MSG_RESULT(yes),AC_MSG_RESULT(no))dnl
])
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