[CMake] ExternalProject and install dir

[Christopher Mullins]

If project Y needs to link to project X, you could build project Y with
ExternalProject_Add and list project X in the DEPENDS parameter.

http://www.cmake.org/cmake/help/v3.0/module/ExternalProject.html


On Wed, Aug 13, 2014 at 9:39 AM, Hans van den Bogert <hansbogert at gmail.com>
wrote:

> I see thanks, so install_dir has a different meaning than the eventual
> install dir of the external project, I thought there would be some ‘magic’
> where the ExternalProject functions would override the the prefix of, in
> this case, project x.
>
> I still have one issue, perhaps I should start a new thread,  but here
> goes:
>
> The external project produces a library, how can I make that library a
> target, so that any executables in the main project who depend on the
> library from ‘x’ will not link before the library is compiled/available.
>
> Because I some instances if I have a parallelized build the following
> scenario can happen.
>
> 1) x is being built
> 1) an executable which depends on an library, libx, from ‘x’ is being
> built.
> 2) the executable proceeds to its linking phase, but needs libx, which is
> not there; build fails.
> 3) ‘x’ has now produced libx
>
> libx was produced too late.
>
>
> My current setup (which exhibits the above) is simply to deduce the
> complete path to the library and add it the executable target.
>
> Is there any way this can be fixed with custom targets or something
> related?
>
>
> On 13 Aug 2014, at 15:23, David Cole <dlrdave at aol.com> wrote:
>
> > See, for example:
> >
> >
> https://github.com/OpenChemistry/openchemistry/blob/master/CMakeLists.txt#L24
> >
> > A common CMAKE_INSTALL_PREFIX is used for all OpenChemistry
> ExternalProject builds that are driven by CMake.
> >
>
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-- 
Christopher Mullins
R&D Engineer
Kitware Inc.,
919.869.8871
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