[CMake] [cmake-developers] CPack: GetPrerequisites: cross-compiling from Linux to Windows

[David Cole]

On Tue, Mar 6, 2012 at 10:28 AM, Eric Noulard <eric.noulard at gmail.com> wrote:
> 2012/3/6 Dominik Schmidt <domme at tomahawk-player.org>:
>> On Tue, Mar 6, 2012 at 4:05 PM, Eric Noulard <eric.noulard at gmail.com> wrote:
>>> > So the next step would be to configure e.g. CPACK_CROSSPACKAGING and
>>> > CPACK_WIN32 in my project config file  and try to make GetPrerequisites
>>> > work
>>> > with them?
>>>
>>> That's not what I was thinking about.
>>> May be you could just add something like:
>>>
>>> if (CPACK_CROSSPACKAGING)
>>>   set(WIN32 @WIN32@)
>>>   set(CMAKE_CROSSCOMPILING @CMAKE_CROSSCOMPILING@)
>>> endif(CPACK_CROSSPACKAGING)
>>>
>>> So that if CPACK_CROSSPACKAGING is set in your CMakeLists.txt
>>> it will trigger the definition of WIN32 and CMAKE_CROSSCOMPILING in your
>>> configured CPackProjectConfig file.
>>
>> Neither works. I took a closer look at CPackConfig.cmake in my build
>> dir and saw
>> SET(CPACK_SYSTEM_NAME "win32") is defined.
>> (which I didnt define, btw
>> http://www.vtk.org/Wiki/CMake:CPackConfiguration say it defaults to
>> CMAKE_SYSTEM_NAME which is Windows in my case tho)
>>
>> When I tried to print it in GetPrerequisites, it was empty.
>> So variables defined there aren't available when needed here it seems.
>>
>> message(FATAL_ERROR "CPACK_SYSTEM_NAME is: ${CPACK_SYSTEM_NAME}")
>>
>> CMake Error at /home/domme/dev/installs/share/cmake-2.8/Modules/GetPrerequisites.cmake:626
>> (message):
>>  CPACK_SYSTEM_NAME is:
>> Call Stack (most recent call first):
>>  /home/domme/dev/installs/share/cmake-2.8/Modules/BundleUtilities.cmake:432
>> (get_prerequisites)
>>  /home/domme/dev/installs/share/cmake-2.8/Modules/BundleUtilities.cmake:612
>> (get_bundle_keys)
>>  /home/domme/dev/sources/my_client/cmake/modules/DeployQt4.cmake:116
>> (fixup_bundle)
>>  /home/domme/dev/sources/my_client/win/cmake_install.cmake:43
>> (FIXUP_QT4_BUNDLE)
>
> This is the interesting part.
> This installation part is launched by CPack before packaging.
>
>>> GetPrerequisites may simply works after that (as far as I understood
>>> your previous e-mail).
>>
>> Err well. with the rest of my patch applied :-)
>
> So I misunderstood, one of your previous answer
>>>    In order to be sure that nothing else is breaking you can try to
>>>    [manually] add the missing definition in the CPackConfig.cmake file.
>>>    This file is loaded by CPack at CPack-time so that any definitions in there
>>>    will be seen during CPack run.
>
>> Went fine.
>
> I have not the rime now to dive into CPack source code in order to check
> which context comes with the installation step launched by CPack.
>
> Does the [cross-]DeployQt4 works if you simply do
>
> make install
>
> ?
>
>
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Just an FYI from the original author of GetPrerequisites here:
cross-packaging was not even considered as we developed it. If it
works at all, it's by happy accident.

I always envisioned packaging as occurring on a "host == target" platform.

If we want to support cross-packaging for real in CMake/CPack, then we
need some dashboard submissions that build such a beast, and submit
nightly... so that we can monitor for errors when we do make changes
to the source tree.


Thanks, and best of luck here,
David C.