[CMake] Automatic rebuild of external projects

[David Cole]

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.
>>
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