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