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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_check_typedef.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_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 AX_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>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 8
AU_ALIAS([AC_CHECK_TYPEDEF], [AX_CHECK_TYPEDEF])
AC_DEFUN([AX_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, $2)`
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <$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 AX_CHECK_TYPEDEF(TYPEDEF, HEADER [, ACTION-IF-FOUND,
dnl [, ACTION-IF-NOT-FOUND ]])
AC_DEFUN([AX_CHECK_TYPEDEF],
[dnl
AC_MSG_CHECKING([for $1 in $2])
AX_CHECK_TYPEDEF_($1,$2,AC_MSG_RESULT(yes),AC_MSG_RESULT(no))dnl
])
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