#
# Copyright (C) 2015-2016 Virgil Security Inc.
#
# Lead Maintainer: Virgil Security Inc. <support@virgilsecurity.com>
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     (1) Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
#
#     (2) Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in
#     the documentation and/or other materials provided with the
#     distribution.
#
#     (3) Neither the name of the copyright holder nor the names of its
#     contributors may be used to endorse or promote products derived from
#     this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#

#
# @brief Defines pointer size for current compiler.
# @return pointer size in bytes thru @param 'pointer_size'
#
function (check_pointer_size pointer_size)
    if (CMAKE_CROSSCOMPILING)
        set (${pointer_size} "" PARENT_SCOPE)
    else ()
        file (WRITE
            ${CMAKE_BINARY_DIR}/CMakeTmp/check_pointer_size.cxx
            "int main() { void *ptr = 0; return sizeof(ptr); }"
        )

        try_run (
            RUN_RESULT
            COMPILE_RESULT
            ${CMAKE_BINARY_DIR}
            ${CMAKE_BINARY_DIR}/CMakeTmp/check_pointer_size.cxx
            OUTPUT_VARIABLE OUTPUT
        )

        if (COMPILE_RESULT AND RUN_RESULT GREATER 0)
            set (${pointer_size} ${RUN_RESULT} PARENT_SCOPE)
        else ()
            set (${pointer_size} "" PARENT_SCOPE)
        endif ()
    endif ()
endfunction (check_pointer_size)