[CMake] Automatic rebuild of external projects

David Cole david.cole at kitware.com
Tue Jul 3 07:15:37 EDT 2012 

Are you really using CMake 2.8.3?

Please try again with 2.8.9-rc1 (or 2.8.8, the latest official release) to
see if the problem persists.

I think with the force step in there, you should always see a re-configure
and re-build (even if both are really no-ops) whenever you do a 'make' in
the top level build directory.


Thanks,
David


On Mon, Jul 2, 2012 at 11:53 PM, Evgeny Startsev
<exbluesbreaker at gmail.com>wrote:

> I am using test project for understanding external project features. There
> are main project with main.cpp source file in <main_dir>:
>
> cmake_minimum_required (VERSION 2.8)
>
> set (PROJECT_NAME main)
> project(${PROJECT_NAME})
>
> include(ExternalProject)
>
> ExternalProject_Add(libhello
>         URL ${CMAKE_CURRENT_LIST_DIR}/
> hello
>         PREFIX  ${CMAKE_CURRENT_LIST_DIR}/prefix/hello
>         CMAKE_ARGS ${CMARGS} -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
>         )
>
> ExternalProject_Add_Step(libhello forceconfigure
>             COMMAND ${CMAKE_COMMAND} -E echo "Force configure of libhello"
>
>             DEPENDEES update
>             DEPENDERS configure
>             ALWAYS 1)
> include_directories(${CMAKE_CURRENT_LIST_DIR}/prefix/hello/include)
> if(BUILD_ANDROID)
>
> link_directories(${CMAKE_CURRENT_LIST_DIR}/prefix/hello/libs/${ANDROID_NDK_ABI_NAME})
> else()
>     link_directories(${CMAKE_CURRENT_LIST_DIR}/prefix/hello/lib)
> endif()
>
> add_executable(${PROJECT_NAME} main.cpp)
> add_dependencies(${PROJECT_NAME} libhello)
>
> target_link_libraries(${PROJECT_NAME} hello)
>
> in <main_dir>/hello test external lib sources - hello.cpp, another.cpp and
> hello.h header:
>
> cmake_minimum_required (VERSION 2.8)
>
> set (PROJECT_NAME hello)
> project(${PROJECT_NAME})
>
> set(SOURCES hello.cpp
>         another.cpp)
>
> add_library(${PROJECT_NAME} SHARED ${SOURCES})
>
> if(BUILD_ANDROID)
>         install(TARGETS ${PROJECT_NAME} DESTINATION
> libs/${ANDROID_NDK_ABI_NAME})
> else(BUILD_ANDROID)
>         install(TARGETS ${PROJECT_NAME} DESTINATION lib)
> endif(BUILD_ANDROID)
>
> install(FILES hello.h DESTINATION include)
>
> I run cmake .. in <main_dir>/build and make after that. All builds
> correctly. But if i change, for example, <main_dir>/hello/hello.cpp , there
> is no rebuild after make.
>
> Cmake version - 2.8.3.
> There are some cross-compile Android things, but as i can understand they
> has no effect on external project module.
>
> Sorry for poor english.
>
>
> On Mon, Jul 2, 2012 at 8:54 PM, David Cole <david.cole at kitware.com> wrote:
>
>> That should work already.
>>
>> If you change the URL of an ExternalProject, it should re-execute the
>> download and all subsequent steps.
>>
>> If you're having problems with that, please post a piece of sample
>> CMake code that we can use to try to reproduce your problem.
>>
>>
>> Thanks,
>> David
>>
>>
>> On Mon, Jul 2, 2012 at 10:30 AM, Evgeny Startsev
>> <exbluesbreaker at gmail.com> wrote:
>> > Thank you, for answers! Sorry, i not accurately describe the problem. I
>> > interested in support rebuild, then source in External_project URL
>> changed.
>> > As i understand it correctly this solution for changes in downloaded
>> local
>> > sources?
>> >
>> > I found only solution with rsync based download command and force rsync
>> step
>> > before install for rebuild, if sources from URL changed.
>> >
>> > On Mon, Jul 2, 2012 at 6:13 PM, David Cole <david.cole at kitware.com>
>> wrote:
>> >>
>> >> It's possible without modifying ExternalProject as well. One technique
>> >> we've adopted on several projects looks something like this:
>> >>
>> >>   # After the ExternalProject_Add call for "myProject"
>> >>   ExternalProject_Add_Step(myProject forceconfigure
>> >>     COMMAND ${CMAKE_COMMAND} -E echo "Force configure of myProject"
>> >>     DEPENDEES update
>> >>     DEPENDERS configure
>> >>     ALWAYS 1)
>> >>
>> >> Or, you can use "DEPENDEES configure DEPENDERS build" as a "forcebuild"
>> >> step.
>> >>
>> >> This is such a common request, that we will probably add
>> >> ALWAYS_CONFIGURE and ALWAYS_BUILD options to ExternalProject_Add in a
>> >> future version.
>> >>
>> >>
>> >> HTH,
>> >> David
>> >>
>> >>
>> >> On Mon, Jul 2, 2012 at 7:55 AM, Yuri Timenkov <yuri at timenkov.ru>
>> wrote:
>> >> > Hi,
>> >> >
>> >> > It's possible with some modifications to ExternalProject.cmake:
>> >> > http://public.kitware.com/Bug/view.php?id=12322
>> >> >
>> >> > However it is not encouraged by CMake developers.
>> >> >
>> >> > On Mon, Jul 2, 2012 at 2:25 PM, Evgeny Startsev
>> >> > <exbluesbreaker at gmail.com> wrote:
>> >> >> I am using external project module for cmake. Is there any way to
>> >> >> rebuild
>> >> >> local external project (from local directory), then its sources was
>> >> >> changed?
>> >> >> I have tried special DOWNLOAD_COMMAND or UPDATE_COMMAND, but this
>> >> >> commands
>> >> >> called only first time.
>> >> >>
>> >> >> --
>> >> >>
>> >> >> Powered by www.kitware.com
>> >> >>
>> >> >> Visit other Kitware open-source projects at
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>> >> >>
>> >> >> Please keep messages on-topic and check the CMake FAQ at:
>> >> >> http://www.cmake.org/Wiki/CMake_FAQ
>> >> >>
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>> >> > --
>> >> >
>> >> > Powered by www.kitware.com
>> >> >
>> >> > Visit other Kitware open-source projects at
>> >> > http://www.kitware.com/opensource/opensource.html
>> >> >
>> >> > Please keep messages on-topic and check the CMake FAQ at:
>> >> > http://www.cmake.org/Wiki/CMake_FAQ
>> >> >
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>> >
>>
>
>
> --
>
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the CMake FAQ at:
> http://www.cmake.org/Wiki/CMake_FAQ
>
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