[CMake] Include XYZ.cmake from external project

[Craig Scott]

Matthias, check out the following article which solves exactly the same
problem as yours, just with GoogleTest as the third party package:

https://crascit.com/2015/07/25/cmake-gtest/

It includes a fully general implementation hosted on github (MIT license)
which you can use directly in your project. The technique discussed there
causes the download to happen immediately so that the sources can be pulled
in via add_subdirectory() without having to restructure  your project as a
superbuild. FWIW, a superbuild is also a good solution, the above article
is just another alternative.



On Sat, Apr 9, 2016 at 6:27 AM, Nicholas Braden <nicholas11braden at gmail.com>
wrote:

> To solve the dependency order problem, generally you would make a
> superbuild which builds your dependencies and also your own project
> via ExternalProject, using the DEPENDS option to guarantee build
> order. This way all your dependencies are fully built and installed
> before it even gets to configuring your own project.
>
> On Fri, Apr 8, 2016 at 3:25 PM, Matthias Möller <mmoelle1 at gmail.com>
> wrote:
> > Dear all,
> >
> > I have difficulties including a XYZ.cmake file from an external project.
> >
> > ExternalProject_Add(MTL4
> >     SVN_REPOSITORY    https://simunova.zih.tu-dresden.de/svn/mtl4/trunk
> >     SVN_USERNAME      guest
> >     SVN_PASSWORD      guest
> >     SVN_TRUST_CERT    1
> >     TIMEOUT           180
> >     PREFIX            ${CMAKE_BINARY_DIR}/external/MTL4
> >     CONFIGURE_COMMAND ""
> >     BUILD_COMMAND     ""
> >     INSTALL_COMMAND   “"
> > )
> >
> > ExternalProject_Get_Property(MTL4 source_dir)
> > set(MTL4_INCLUDE_DIRS ${source_dir})
> > set(MTL_DIR ${source_dir})
> >
> > # Include MTLConfig from the unpacked(!!!) MTL4 library
> > include("${source_dir}/MTLConfig.cmake" OPTIONAL RESULT_VARIABLE
> > MTLCONFIG_FOUND)
> >
> >
> > # MTL4 is a header-only library, hence downloading and unpacking is
> > sufficient
> > add_executable (demo demo.cxx)
> > add_dependencies(demo MTL4)
> >
> > The problem is, that in a fresh build the MTL4 library is not yet
> unpacked,
> > and hence, the MTLConfig.cmake file is not available.
> > How can I “include(…)” a cmake file which is only available after the
> > external project has been processed?
> >
> > Kind regards,
> > Matthias
> >
> >
> > --
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-- 
Craig Scott
Melbourne, Australia
http://crascit.com
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