64 lines
1.9 KiB
CMake
64 lines
1.9 KiB
CMake
cmake_minimum_required (VERSION 2.6)
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project (ExternalOBJ)
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if(APPLE)
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# set _CMAKE_OSX_MACHINE to umame -m
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exec_program(uname ARGS -m OUTPUT_VARIABLE _CMAKE_OSX_MACHINE)
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# check for Power PC and change to ppc
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if("${_CMAKE_OSX_MACHINE}" MATCHES "Power")
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set(_CMAKE_OSX_MACHINE ppc)
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endif()
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set(CMAKE_OSX_ARCHITECTURES ${_CMAKE_OSX_MACHINE})
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endif()
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# Build the external object file.
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try_compile(EXTERNAL_OBJECT_BUILT
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${ExternalOBJ_BINARY_DIR}/Object
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${ExternalOBJ_SOURCE_DIR}/Object
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Object
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external
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OUTPUT_VARIABLE OUTPUT
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)
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if(EXTERNAL_OBJECT_BUILT)
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message(
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"Building external_object.cxx succeeded with the following output:\n"
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"[${OUTPUT}]"
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)
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else()
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message(FATAL_ERROR
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"Building external_object.cxx failed with the following output:\n"
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"[${OUTPUT}]"
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)
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endif()
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# Find the external object file.
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set(DIR ${ExternalOBJ_BINARY_DIR}/Object)
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file(GLOB_RECURSE EXTERNAL_OBJECT
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"${DIR}/external_object*${CMAKE_CXX_OUTPUT_EXTENSION}")
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if(EXTERNAL_OBJECT)
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list (GET EXTERNAL_OBJECT 0 EXTERNAL_OBJECT)
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message("Found \"${EXTERNAL_OBJECT}\".")
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else()
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message(FATAL_ERROR "Could not find external object.")
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endif()
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# Test creation of external objects by custom commands.
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set(CUSTOM_OBJECT
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${CMAKE_CURRENT_BINARY_DIR}/custom_object${CMAKE_C_OUTPUT_EXTENSION})
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add_custom_command(
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OUTPUT ${CUSTOM_OBJECT}
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COMMAND ${CMAKE_COMMAND} -E copy ${EXTERNAL_OBJECT} ${CUSTOM_OBJECT}
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DEPENDS ${EXTERNAL_OBJECT}
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)
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message("${EXTERNAL_OBJECT}")
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# Build an executable using the external object file.
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add_executable(ExternalOBJ executable.cxx ${CUSTOM_OBJECT})
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# A bug showed up in VS2010 where an object file that was
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# part of a custom commad output worked, but ones that were
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# not didn't work. So, repeat the executable using the object
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# directly and not from the output of the copy.
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add_executable(ExternalOBJ2 executable.cxx ${EXTERNAL_OBJECT})
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add_subdirectory(Sub)
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