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# - Script to get the value of a preprocessor definition that is a string,
# after including the given files
# Requires that the associated source file be present: GetDefineString.cpp.in.
#
# get_define_string(NAME <define_name> [INCLUDES <files>] RESULT <variable>
# [FLAGS <compile-flags>]
# [INCLUDE_DIRS <include-dirs>]
# [DEFINES] <-Ddefinitions>)
# Original Author:
# 2014 Ryan Pavlik <ryan@sensics.com> <abiryan@ryand.net>
#
# Copyright Sensics, Inc. 2014.
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)
get_filename_component(_getdefinestring_moddir "${CMAKE_CURRENT_LIST_FILE}" PATH)
function(get_define_string)
include(CMakeParseArguments)
cmake_parse_arguments(_gds "" "NAME;RESULT" "INCLUDES;FLAGS;INCLUDE_DIRS;DEFINES" ${ARGN})
if(NOT _gds_NAME)
message(FATAL_ERROR "Must pass NAME to get_define_string!")
endif()
if(NOT _gds_RESULT)
message(FATAL_ERROR "Must pass RESULT to get_define_string!")
endif()
if(NOT DEFINED "${_gds_RESULT}_CHECKED" OR (NOT "${${_gds_RESULT}_CHECKED}" STREQUAL "${ARGN}"))
set(${_gds_RESULT}_CHECKED "${ARGN}" CACHE INTERNAL "" FORCE)
set(GET_DEFINE_STRING_NAME ${_gds_NAME})
set(_INCLUDES)
if(_gds_INCLUDE_DIRS)
set(_INCLUDES "-DINCLUDE_DIRECTORIES:STRING=${_gds_INCLUDE_DIRS}")
endif()
set(GET_DEFINE_STRING_INCLUDES)
foreach(_file ${_gds_INCLUDES})
set(GET_DEFINE_STRING_INCLUDES "${GET_DEFINE_STRING_INCLUDES}#include <${_file}>\n")
endforeach()
set(_src "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/GetDefineString${_gds_RESULT}.cpp")
set(_out "${CMAKE_CURRENT_BINARY_DIR}/GetDefineString${_gds_RESULT}.out")
configure_file("${_getdefinestring_moddir}/GetDefineString.cpp.in" "${_src}")
try_compile(_result "${CMAKE_CURRENT_BINARY_DIR}" SOURCES "${_src}"
CMAKE_FLAGS ${_INCLUDES}
COMPILE_DEFINITIONS ${_gds_DEFINES}
OUTPUT_VARIABLE OUTPUT
COPY_FILE "${_out}")
if(_result)
file(STRINGS "${_out}" _result_string REGEX "INFO:[A-Za-z0-9_]+\\[[^]]*\\]")
if("${_result_string}" MATCHES "INFO:define\\[([^]\"]*)\\]")
set(${_gds_RESULT}_CACHED "${CMAKE_MATCH_1}" CACHE INTERNAL "" FORCE)
endif()
else()
set(${_gds_RESULT}_CACHED NOTFOUND)
endif()
endif()
set(${_gds_RESULT} ${${_gds_RESULT}_CACHED} PARENT_SCOPE)
endfunction()
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