Re: [PATCH] gnu: mesa: Add libva input.

[ludo@gnu.org (Ludovic Courtès)]

taylanbayirli@gmail.com (Taylan Ulrich "Bayırlı/Kammer") skribis:

> Actually, I hit the problem again now; it's during the compilation of
> .scm files.
>
> The problem seems to be that 'inherit' fields of packages are evaluated
> eagerly, so when video.scm directly or indirectly imports gl.scm before
> having bound the libva variable to its value, and the libva-without-mesa
> definition in gl.scm tries to reference libva, it errors.
>
> I can solve this by wrapping the libva-without-mesa definition in a
> delay, and forcing it in the input field of mesa.  Is that OK?

Yes, indeed, the solution in such cases is to use a promise or a thunk,
or to have the two definitions in the same file.

Thanks,
Ludo’.