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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_gnucxx_hashmap.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CXX_GNUCXX_HASHMAP
#
# DESCRIPTION
#
# Test for the presence of GCC's hashmap STL extension.
#
# LICENSE
#
# Copyright (c) 2008 Patrick Mauritz <oxygene@studentenbude.ath.cx>
#
# 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 7
AU_ALIAS([AC_CXX_GNUCXX_HASHMAP], [AX_CXX_GNUCXX_HASHMAP])
AC_DEFUN([AX_CXX_GNUCXX_HASHMAP],[
AC_CACHE_CHECK(whether the compiler supports __gnu_cxx::hash_map,
ax_cv_cxx_gnucxx_hashmap,
[AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([#include <ext/hash_map>
using __gnu_cxx::hash_map;],
[],
ax_cv_cxx_gnucxx_hashmap=yes, ax_cv_cxx_gnucxx_hashmap=no)
AC_LANG_RESTORE
])
if test "$ax_cv_cxx_gnucxx_hashmap" = yes; then
AC_DEFINE(HAVE_GNUCXX_HASHMAP,,[define if the compiler supports __gnu_cxx::hash_map])
fi
])
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