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PROJECT (ExternalOBJ)
# Build the external object file.
TRY_COMPILE(EXTERNAL_OBJECT_BUILT
${ExternalOBJ_BINARY_DIR}/Object
${ExternalOBJ_SOURCE_DIR}/Object
Object
external
OUTPUT_VARIABLE OUTPUT
)
SET(EXTERNAL_OBJECT_NAME "external_object${CMAKE_CXX_OUTPUT_EXTENSION}")
IF(EXTERNAL_OBJECT_BUILT)
MESSAGE(
"Building ${EXTERNAL_OBJECT_NAME} succeeded with the following output:\n"
"[${OUTPUT}]"
)
ELSE(EXTERNAL_OBJECT_BUILT)
MESSAGE(FATAL_ERROR
"Building ${EXTERNAL_OBJECT_NAME} failed with the following output:\n"
"[${OUTPUT}]"
)
ENDIF(EXTERNAL_OBJECT_BUILT)
# Find the external object file.
SET(BASE ${ExternalOBJ_BINARY_DIR}/Object)
SET(EXTERNAL_OBJECT)
FOREACH(dir external.dir . ${CMAKE_CONFIGURATION_TYPES})
IF(NOT EXTERNAL_OBJECT)
IF(EXISTS ${BASE}/${dir}/${EXTERNAL_OBJECT_NAME})
SET(EXTERNAL_OBJECT ${BASE}/${dir}/${EXTERNAL_OBJECT_NAME})
ENDIF(EXISTS ${BASE}/${dir}/${EXTERNAL_OBJECT_NAME})
ENDIF(NOT EXTERNAL_OBJECT)
ENDFOREACH(dir)
IF(NOT EXTERNAL_OBJECT)
FILE(GLOB_RECURSE EXTERNAL_OBJECT
"${ExternalOBJ_BINARY_DIR}/Object/${EXTERNAL_OBJECT_NAME}")
ENDIF(NOT EXTERNAL_OBJECT)
IF(EXTERNAL_OBJECT)
MESSAGE("Found \"${EXTERNAL_OBJECT}\".")
ELSE(EXTERNAL_OBJECT)
MESSAGE(FATAL_ERROR "Could not find ${EXTERNAL_OBJECT_NAME}.")
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}
)
# Build an executable using the external object file.
ADD_EXECUTABLE(executable executable.cxx ${CUSTOM_OBJECT})
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