[Cmake] FindPackage + UsePackage

[Bitter, Ingmar (NIH/CC/DRD)]

Hi,

It seems to use a library the following is standard CMake code:

FIND_PACKAGE(Qt)
IF(QT_INCLUDE_DIR)
  IF(QT_QT_LIBRARY)
    INCLUDE_DIRECTORIES( ${QT_INCLUDE_DIR} )
    LINK_LIBRARIES ( optimized qt-mt312 optimized qtmain 
                         debug qt-mtd       debug qtmaind)
    LINK_DIRECTORIES( ${QT_LIBRARY_PATH} )
  ENDIF(QT_QT_LIBRARY)
ENDIF(QT_INCLUDE_DIR)

This means that one has to remember the library names each time a new local
project is setup and the IF cascade clutters the CMakeList.txt file.

I had temporarily modified the FindQT.cmake file, such that it automatically
included the library and set the path. Then including many libraries looks
clean:

#setup system libraries
FIND_PACKAGE(Ctn)
FIND_PACKAGE(VGL)
FIND_PACKAGE(ITK)
FIND_PACKAGE(Qt)
FIND_PACKAGE(Coin)
FIND_PACKAGE(OpenGL)
FIND_PACKAGE(Explorer)
FIND_PACKAGE(GLsdk)

But it cased problems with standard packages expecting the default versions
of FindXYZ.cmake.

Could a new function UsePackage(XYZ) be added to CMake that would call the
appropriate UseXYZ.cmake file ?  Then CMakeLIst.txt could look nice again:

#setup system libraries
FIND_PACKAGE(Ctn)       UsePackage(Ctn)
FIND_PACKAGE(VGL)       UsePackage(VGL)
FIND_PACKAGE(ITK)       UsePackage(ITK)
FIND_PACKAGE(Qt)        UsePackage(Qt)
FIND_PACKAGE(Coin)      UsePackage(Coin)
FIND_PACKAGE(OpenGL)    UsePackage(OpenGL)
FIND_PACKAGE(Explorer)  UsePackage(Explorer)
FIND_PACKAGE(GLsdk)     UsePackage(GLsdk)

-Ingmar