1# - Get the platform-appropriate flags to add to force inclusion of a file
2#
3# The most common use of this is to use a generated config.h-type file
4# placed out of the source tree in all files.
5#
6#  get_force_include_definitions(var forcedincludefiles...) -
7#   where var is the name of  your desired output variable, and everything
8#   else is a source file to forcibly include.
9#   a list item to be filtered.
10#
11# Original Author:
12# 2009-2010 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
13# http://academic.cleardefinition.com
14# Iowa State University HCI Graduate Program/VRAC
15#
16# Copyright Iowa State University 2009-2010.
17# Distributed under the Boost Software License, Version 1.0.
18# (See accompanying file LICENSE_1_0.txt or copy at
19# http://www.boost.org/LICENSE_1_0.txt)
20
21if(__get_force_include_definitions)
22	return()
23endif()
24set(__get_force_include_definitions YES)
25
26function(get_force_include_definitions var)
27	set(_flagprefix)
28	if(CMAKE_COMPILER_IS_GNUCXX)
29		set(_flag "-include")
30	elseif(MSVC)
31		set(_flag "/FI")
32	else()
33		message(SEND_ERROR "You don't seem to be using MSVC or GCC, but")
34		message(SEND_ERROR "the project called get_force_include_definitions.")
35		message(SEND_ERROR "Contact this project with the name of your")
36		message(FATAL_ERROR "compiler and preferably the flag to force includes")
37	endif()
38
39	set(_out)
40	foreach(_item ${ARGN})
41		list(APPEND _out "${_flag} \"${_item}\"")
42	endforeach()
43	set(${var} "${_out}" PARENT_SCOPE)
44endfunction()
45