# ===========================================================================
#  https://www.gnu.org/software/autoconf-archive/ax_prog_cxx_for_build.html
# ===========================================================================
#
# SYNOPSIS
#
#   AX_PROG_CXX_FOR_BUILD
#
# DESCRIPTION
#
#   This macro searches for a C++ compiler that generates native
#   executables, that is a C++ compiler that surely is not a cross-compiler.
#   This can be useful if you have to generate source code at compile-time
#   like for example GCC does.
#
#   The macro sets the CXX_FOR_BUILD and CXXCPP_FOR_BUILD macros to anything
#   needed to compile or link (CXX_FOR_BUILD) and preprocess
#   (CXXCPP_FOR_BUILD). The value of these variables can be overridden by
#   the user by specifying a compiler with an environment variable (like you
#   do for standard CXX).
#
# LICENSE
#
#   Copyright (c) 2008 Paolo Bonzini <bonzini@gnu.org>
#   Copyright (c) 2012 Avionic Design GmbH
#
#   Based on the AX_PROG_CC_FOR_BUILD macro by Paolo Bonzini.
#
#   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 4

AU_ALIAS([AC_PROG_CXX_FOR_BUILD], [AX_PROG_CXX_FOR_BUILD])
AC_DEFUN([AX_PROG_CXX_FOR_BUILD], [dnl
AC_REQUIRE([AX_PROG_CC_FOR_BUILD])dnl
AC_REQUIRE([AC_PROG_CXX])dnl
AC_REQUIRE([AC_PROG_CXXCPP])dnl
AC_REQUIRE([AC_CANONICAL_HOST])dnl

dnl Use the standard macros, but make them use other variable names
dnl
pushdef([ac_cv_prog_CXXCPP], ac_cv_build_prog_CXXCPP)dnl
pushdef([ac_cv_prog_gxx], ac_cv_build_prog_gxx)dnl
pushdef([ac_cv_prog_cxx_works], ac_cv_build_prog_cxx_works)dnl
pushdef([ac_cv_prog_cxx_cross], ac_cv_build_prog_cxx_cross)dnl
pushdef([ac_cv_prog_cxx_g], ac_cv_build_prog_cxx_g)dnl
pushdef([CXX], CXX_FOR_BUILD)dnl
pushdef([CXXCPP], CXXCPP_FOR_BUILD)dnl
pushdef([GXX], GXX_FOR_BUILD)dnl
pushdef([CXXFLAGS], CXXFLAGS_FOR_BUILD)dnl
pushdef([CPPFLAGS], CPPFLAGS_FOR_BUILD)dnl
pushdef([CXXCPPFLAGS], CXXCPPFLAGS_FOR_BUILD)dnl
pushdef([host], build)dnl
pushdef([host_alias], build_alias)dnl
pushdef([host_cpu], build_cpu)dnl
pushdef([host_vendor], build_vendor)dnl
pushdef([host_os], build_os)dnl
pushdef([ac_cv_host], ac_cv_build)dnl
pushdef([ac_cv_host_alias], ac_cv_build_alias)dnl
pushdef([ac_cv_host_cpu], ac_cv_build_cpu)dnl
pushdef([ac_cv_host_vendor], ac_cv_build_vendor)dnl
pushdef([ac_cv_host_os], ac_cv_build_os)dnl
pushdef([ac_tool_prefix], ac_build_tool_prefix)dnl
pushdef([am_cv_CXX_dependencies_compiler_type], am_cv_build_CXX_dependencies_compiler_type)dnl
pushdef([cross_compiling], cross_compiling_build)dnl

cross_compiling_build=no

ac_build_tool_prefix=
AS_IF([test -n "$build"],      [ac_build_tool_prefix="$build-"],
      [test -n "$build_alias"],[ac_build_tool_prefix="$build_alias-"])

AC_LANG_PUSH([C++])
AC_PROG_CXX
AC_PROG_CXXCPP

dnl Restore the old definitions
dnl
popdef([cross_compiling])dnl
popdef([am_cv_CXX_dependencies_compiler_type])dnl
popdef([ac_tool_prefix])dnl
popdef([ac_cv_host_os])dnl
popdef([ac_cv_host_vendor])dnl
popdef([ac_cv_host_cpu])dnl
popdef([ac_cv_host_alias])dnl
popdef([ac_cv_host])dnl
popdef([host_os])dnl
popdef([host_vendor])dnl
popdef([host_cpu])dnl
popdef([host_alias])dnl
popdef([host])dnl
popdef([CXXCPPFLAGS])dnl
popdef([CPPFLAGS])dnl
popdef([CXXFLAGS])dnl
popdef([CXXCPP])dnl
popdef([CXX])dnl
popdef([ac_cv_prog_cxx_g])dnl
popdef([ac_cv_prog_cxx_cross])dnl
popdef([ac_cv_prog_cxx_works])dnl
popdef([ac_cv_prog_gxx])dnl
popdef([ac_cv_prog_CXXCPP])dnl

dnl restore global variables (dependant on the current
dnl language after popping):
AC_LANG_POP([C++])

dnl Finally, set Makefile variables
dnl
AC_SUBST([CXXFLAGS_FOR_BUILD])dnl
AC_SUBST([CXXCPPFLAGS_FOR_BUILD])dnl
])