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# =============================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_header_pre_stdcxx.html
# =============================================================================
#
# SYNOPSIS
#
# AX_CXX_HEADER_PRE_STDCXX
#
# DESCRIPTION
#
# Check whether pre-ISO-C++ headers exist.
#
# LICENSE
#
# Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
#
# 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_CXX_HEADER_PRE_STDCXX], [AX_CXX_HEADER_PRE_STDCXX])
AC_DEFUN([AX_CXX_HEADER_PRE_STDCXX], [
AC_CACHE_CHECK(for pre-ISO C++ include files,
ax_cv_cxx_pre_stdcxx,
[AC_LANG_PUSH([C++])
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -Wno-deprecated"
# Omit defalloc.h, as compilation with newer compilers is problematic.
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <new.h>
#include <iterator.h>
#include <alloc.h>
#include <set.h>
#include <hashtable.h>
#include <hash_set.h>
#include <fstream.h>
#include <tempbuf.h>
#include <istream.h>
#include <bvector.h>
#include <stack.h>
#include <rope.h>
#include <complex.h>
#include <ostream.h>
#include <heap.h>
#include <iostream.h>
#include <function.h>
#include <multimap.h>
#include <pair.h>
#include <stream.h>
#include <iomanip.h>
#include <slist.h>
#include <tree.h>
#include <vector.h>
#include <deque.h>
#include <multiset.h>
#include <list.h>
#include <map.h>
#include <algobase.h>
#include <hash_map.h>
#include <algo.h>
#include <queue.h>
#include <streambuf.h>
]], [])],
[ax_cv_cxx_pre_stdcxx=yes], [ax_cv_cxx_pre_stdcxx=no])
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_POP([C++])
])
if test "$ax_cv_cxx_pre_stdcxx" = yes; then
AC_DEFINE(PRE_STDCXX_HEADERS,,[Define if pre-ISO C++ header files are present. ])
fi
])
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