[CMake] Building a tool immediately so it can be used later in same CMake run

[Tamás Kenéz]

Craig,

My cmake-based build system in my company's CI framework works exactly that
way: there's a generic cmake script[1] (invoked with cmake -P) that reads
in a file which contains repo-urls and build parameters for 50+ projects
and builds them for 3 platforms (linux, win, mac) 5 compilers
(cross-compilers, too) invoking child cmake builds with execute_process.
This is done after each push and one daily clean build.

I've never had any problems with that approach.

On the other hand, the system was originally designed with ExternalProject
and I had many problems.

[1]: https://github.com/tamaskenez/centralbuilder

Tamas



On Fri, Apr 1, 2016 at 1:53 AM, Craig Scott <craig.scott at crascit.com> wrote:

> All,
>
> I originally planned to ask this question directly on this mailing list,
> but it got a bit more involved, so I posted it to stackoverflow instead.
> I'm interested if anyone can shed some more authoritative light on the
> proposed method for the following question:
>
> http://stackoverflow.com/q/36084785/1938798
>
> *Short version*: invoke a nested cmake-and-build immediately within the
> main CMake run to build a specific target via execute_process(). This makes
> that tool available for use still within the same (main) CMake run. An
> ExternalProject-based technique would normally be a better solution, but in
> this particular case, that wasn't possible.
>
> I'd be interested if anyone can confirm whether the suggested approach is
> guaranteed to be safe for all generators and platforms, or whether there
> are other factors I have not considered in the proposed technique.
>
> Cheers
>
> --
> Craig Scott
> Melbourne, Australia
> http://crascit.com
>
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