cmake and custom build targets

[Alexander Dymo]

Hi!
I'm using add_custom_target to create some files before building ThreadWeaver
library (http://websvn.kde.org/trunk/kdenonbeta/threadweaver/Weaver).
The problem is I want to generate Job_moc.cpp only once but 
it is recreated each time i run make. Can anybody please tell me how can I
avoid that?
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kde4_header()

project(weaver)

include_directories(${QT_INCLUDE_DIR} ${QT_QTCORE_INCLUDE_DIR} ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR})

add_definitions(-DUSE_CMAKE)

########### next target ###############

set(ThreadWeaver_LIB_SRCS
    DestructedState.cpp
    WeaverImpl.cpp
    Job.cpp
    InConstructionState.cpp
    State.cpp
    ShuttingDownState.cpp
    WeaverInterface.cpp
    WeaverObserver.cpp
    SuspendedState.cpp
    WorkingHardState.cpp
    DebuggingAids.cpp
    ThreadWeaver.cpp
    Thread.cpp
    SuspendingState.cpp
    IncludeMocs.cpp
)

kde4_automoc(${ThreadWeaver_LIB_SRCS})


QT4_GET_MOC_INC_DIRS(_moc_INCS)

add_custom_target(Moc1 ${QT_MOC_EXECUTABLE} ${_moc_INCS} ${CMAKE_CURRENT_SOURCE_DIR}/Job.cpp -o ${CMAKE_CURRENT_BINARY_DIR}/Job_moc.cpp)
add_custom_target(Moc2 ${QT_MOC_EXECUTABLE} ${_moc_INCS} ${CMAKE_CURRENT_SOURCE_DIR}/Thread.cpp -o ${CMAKE_CURRENT_BINARY_DIR}/Thread_moc.cpp)


kde4_add_library(ThreadWeaver SHARED ${ThreadWeaver_LIB_SRCS})
add_dependencies(ThreadWeaver Moc1 Moc2)
target_link_libraries(ThreadWeaver ${QT_QTCORE_LIBRARY})
set_target_properties(ThreadWeaver PROPERTIES VERSION 4.2.0 SOVERSION 4)
install_targets(/lib ThreadWeaver)

macro_additional_clean_files(${CMAKE_CURRENT_BINARY_DIR}/Job_moc.cpp ${CMAKE_CURRENT_BINARY_DIR}/Thread_moc.cpp)

kde4_footer()