Hi Matthew,
‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Monday, December 14, 2020 3:55 AM, Matthew Brooks
<matthewfbro...@mailbox.org> wrote:
> I'm working on a custom package definition, but when it gets built the cmake
> files are in "source/src" instead of "source", and so the build system errors
> out when trying to run cmake. How do I specify the source directory for the
> cmake build system?
> From grepping around in the definition for the cmake build system, it appears
> that it expects the "source" variable to point to the appropriate location,
> but I'm not at all familiar with scheme or guile, and I have no idea if
> that's correct or how to change it.
I'll try to answer you. I'm never played with this, but I think we can find
something together.
Cmake buildsystem has an interesting keyword argument called #:out-of-source?
that chooses to compile the project inside sources or in a separate build
directory. You need something similar, but not that.
I tracked down that variable and I finally got into Cmake's configure step: I'm
reading the contents of the file `guix/build/cmake-build-system.scm`.
There you can find the definition of the `configure` step. You don't really
need to do a lot in you package. You can replace the configure step with your
own version of it, using the `sources/src` directory instead of what the
default version uses.
In order to replace the configure phase you need to do add a `#:phases`
`argument` to your package and use a `modify-phases` call to `replace
'configure` with your own. (all the parts marked with backticks are literal
code, grep them in the gnu/packages/ directory and you'll find examples).
Your version could have the exact same contents that the default but with
different directory. You just need to make a `chdir` to the place you like,
just like this block (line 46 in guix/build/cmake-build-system.scm) does:
``` scheme
(when out-of-source?
(mkdir "../build")
(chdir "../build"))
(format #t "build directory: ~s~%" (getcwd))
```
Remove all of it and change it with `(chdir "src")` or something like that and
it should work.
That's most of it. I just gave you a high-level explanation but you can ask me
more if you need. Just ask anything you need.
Best,
Ekaitz
