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# =============================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_0x.html
# =============================================================================
#
# SYNOPSIS
#
# AX_CXX_COMPILE_STDCXX_0X
#
# DESCRIPTION
#
# Check for baseline language coverage in the compiler for the C++0x
# standard.
#
# This macro is deprecated and has been superseded by the
# AX_CXX_COMPILE_STDCXX_11 macro which should be used instead.
#
# 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 12
AU_ALIAS([AC_CXX_COMPILE_STDCXX_0X], [AX_CXX_COMPILE_STDCXX_0X])
AC_DEFUN([AX_CXX_COMPILE_STDCXX_0X], [
AC_OBSOLETE([$0], [; use AX_CXX_COMPILE_STDCXX_11 instead])
AC_CACHE_CHECK(if g++ supports C++0x features without additional flags,
ax_cv_cxx_compile_cxx0x_native,
[AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
template <typename T>
struct check
{
static_assert(sizeof(int) <= sizeof(T), "not big enough");
};
typedef check<check<bool>> right_angle_brackets;
int a;
decltype(a) b;
typedef check<int> check_type;
check_type c;
check_type&& cr = static_cast<check_type&&>(c);]], [])],
[ax_cv_cxx_compile_cxx0x_native=yes], [ax_cv_cxx_compile_cxx0x_native=no])
AC_LANG_POP([C++])
])
AC_CACHE_CHECK(if g++ supports C++0x features with -std=c++0x,
ax_cv_cxx_compile_cxx0x_cxx,
[AC_LANG_PUSH([C++])
ac_save_CXX="$CXX"
CXX="$CXX -std=c++0x"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
template <typename T>
struct check
{
static_assert(sizeof(int) <= sizeof(T), "not big enough");
};
typedef check<check<bool>> right_angle_brackets;
int a;
decltype(a) b;
typedef check<int> check_type;
check_type c;
check_type&& cr = static_cast<check_type&&>(c);]], [])],
[ax_cv_cxx_compile_cxx0x_cxx=yes], [ax_cv_cxx_compile_cxx0x_cxx=no])
CXX="$ac_save_CXX"
AC_LANG_POP([C++])
])
AC_CACHE_CHECK(if g++ supports C++0x features with -std=gnu++0x,
ax_cv_cxx_compile_cxx0x_gxx,
[AC_LANG_PUSH([C++])
ac_save_CXX="$CXX"
CXX="$CXX -std=gnu++0x"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
template <typename T>
struct check
{
static_assert(sizeof(int) <= sizeof(T), "not big enough");
};
typedef check<check<bool>> right_angle_brackets;
int a;
decltype(a) b;
typedef check<int> check_type;
check_type c;
check_type&& cr = static_cast<check_type&&>(c);]], [])],
[ax_cv_cxx_compile_cxx0x_gxx=yes], [ax_cv_cxx_compile_cxx0x_gxx=no])
CXX="$ac_save_CXX"
AC_LANG_POP([C++])
])
if test "$ax_cv_cxx_compile_cxx0x_native" = yes ||
test "$ax_cv_cxx_compile_cxx0x_cxx" = yes ||
test "$ax_cv_cxx_compile_cxx0x_gxx" = yes; then
AC_DEFINE(HAVE_STDCXX_0X,,[Define if g++ supports C++0x features. ])
fi
])
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