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# =============================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_cppflags_std_lang.html
# =============================================================================
#
# SYNOPSIS
#
# AX_CXX_CPPFLAGS_STD_LANG(CPP-FLAGS)
#
# DESCRIPTION
#
# Append to CPP-FLAGS the set of flags that should be passed to the C++
# preprocessor in order to enable use of C++ features as defined in the
# ANSI C++ standard (eg. use of standard iostream classes in the `std'
# namespace, etc.).
#
# LICENSE
#
# Copyright (c) 2008 Ludovic Courtes <ludo@chbouib.org>
#
# 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 10
AU_ALIAS([AC_CXX_CPPFLAGS_STD_LANG], [AX_CXX_CPPFLAGS_STD_LANG])
AC_DEFUN([AX_CXX_CPPFLAGS_STD_LANG],
[AC_LANG_ASSERT([C++])
AC_REQUIRE([AX_COMPILER_VENDOR])
case "$ax_cv_cxx_compiler_vendor" in
dec|compaq)
# By default, Compaq CXX has an iostream classes implementation
# that is _not_ in the `std' namespace.
$1="$$1 -D__USE_STD_IOSTREAM=1";;
hp)
# When `configure' looks for a C++ header (eg. <iostream>) it invokes
# `aCC -E $CPPFLAGS'. However, including standard C++ headers like
# <iostream> fails if `-AA' is not supplied.
$1="$$1 -AA";;
esac])
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