On 17. Mar, 2010, at 13:17 , Nicola Brisotto wrote:
> Hi!
> I'm building a project that require a 3rd party library libqxmpp. Both
> project uses cmake
> I want to build libqxmpp with ExternalProject_add, this the code I use:
>
> ExternalProject_add(
> libqxmpp
> #no download, i'm using git submodule
> DOWNLOAD_COMMAND ""
> CMAKE_ARGS
> -DQT_QMAKE_EXECUTABLE=/devel/BIN/v4.6.1-git-phonon-dbg-release/bin/qmake
> -DCMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}
> SOURCE_DIR ${CMAKE_SOURCE_DIR}/src/3rdparty/qxmpp-read-only-git/source
> )
>
> The problem arise when I try to import a target from libqxmpp adding this to
> my project CMakeLists.txt:
> #Import libQXmppClient
> include(${CMAKE_BINARY_DIR}/include/QXmppClient/QXmppClient.cmake)
>
> Cmake cannot find QXmppClient.cmake because it will be created when I'll
> build the project.
> How can I solve this problem? Are there better solution to build and link an
> external project?
>
> This is the libqxmpp snippet that export the target:
>
> INSTALL(TARGETS QXmppClient EXPORT QXmppClient DESTINATION lib)
> INSTALL(EXPORT QXmppClient DESTINATION include/QXmppClient )
>
> Nicola Brisotto
> vcard
There are two ways of getting around this:
1) create the IMPORTED targets yourself.
2) also build your main project wit a ExternalProject_Add and drive the whole
thing from a "master-CMakeLists.txt"
The first one is probably easier to set up, but requires you to guess the
installation names and paths correctly. The second option requires you to
restructure your whole build system and adds considerable complexity due to the
communication between your master-project and the external projects. For this
communication I'd try the following:
- In the master project do all the feature-detection and setting of cache
variables (such as options etc)
- Write a cache-initializer script to the binary tree
- Do all the ExternalProject_Add calls and specify the cache-initializer script
with the -C option in CMAKE_ARGS
HTH
Michael
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