#############################################################################
#
# ViSP, open source Visual Servoing Platform software.
# Copyright (C) 2005 - 2023 by Inria. All rights reserved.
#
# This software is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# See the file LICENSE.txt at the root directory of this source
# distribution for additional information about the GNU GPL.
#
# For using ViSP with software that can not be combined with the GNU
# GPL, please contact Inria about acquiring a ViSP Professional
# Edition License.
#
# See https://visp.inria.fr for more information.
#
# This software was developed at:
# Inria Rennes - Bretagne Atlantique
# Campus Universitaire de Beaulieu
# 35042 Rennes Cedex
# France
#
# If you have questions regarding the use of this file, please contact
# Inria at visp@inria.fr
#
# This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
# WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#
# Description:
# Some macros to check for macro or function availability.
#
#############################################################################

include(CheckCXXSourceCompiles)

macro(check_math_expr _expr _header _var)
    unset(${_var} CACHE)
    # Since check_cxx_source_compiles() doesn't consider CXX_STANDARD we add the corresponding flag manually
    if((VISP_CXX_STANDARD EQUAL VISP_CXX_STANDARD_11) AND CXX11_CXX_FLAGS)
      set(CMAKE_REQUIRED_FLAGS ${CXX11_CXX_FLAGS})
    elseif((VISP_CXX_STANDARD EQUAL VISP_CXX_STANDARD_14) AND CXX14_CXX_FLAGS)
      set(CMAKE_REQUIRED_FLAGS ${CXX14_CXX_FLAGS})
    elseif((VISP_CXX_STANDARD EQUAL VISP_CXX_STANDARD_17) AND CXX17_CXX_FLAGS)
      set(CMAKE_REQUIRED_FLAGS ${CXX17_CXX_FLAGS})
    endif()
    check_cxx_source_compiles("
#include ${_header}
int main(int argc, char ** argv)
{
    (void)${_expr};
    return 0;
}
" ${_var})
endmacro()
