simgear/CMakeModules/GetForceIncludeDefinitions.cmake

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# - Get the platform-appropriate flags to add to force inclusion of a file
#
# The most common use of this is to use a generated config.h-type file
# placed out of the source tree in all files.
#
# get_force_include_definitions(var forcedincludefiles...) -
# where var is the name of your desired output variable, and everything
# else is a source file to forcibly include.
# a list item to be filtered.
#
# Original Author:
# 2009-2010 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
# http://academic.cleardefinition.com
# Iowa State University HCI Graduate Program/VRAC
#
# Copyright Iowa State University 2009-2010.
# 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)
if(__get_force_include_definitions)
return()
endif()
set(__get_force_include_definitions YES)
function(get_force_include_definitions var)
set(_flagprefix)
if(CMAKE_COMPILER_IS_GNUCXX)
set(_flag "-include")
elseif(MSVC)
set(_flag "/FI")
else()
message(SEND_ERROR "You don't seem to be using MSVC or GCC, but")
message(SEND_ERROR "the project called get_force_include_definitions.")
message(SEND_ERROR "Contact this project with the name of your")
message(FATAL_ERROR "compiler and preferably the flag to force includes")
endif()
set(_out)
foreach(_item ${ARGN})
list(APPEND _out "${_flag} \"${_item}\"")
endforeach()
set(${var} "${_out}" PARENT_SCOPE)
endfunction()