macros: use smp_mflags

[bmwiedemann]

use %{_smp_mflags}
to avoid embedding the number of CPU cores
in the .src.rpm header's expanded SPEC field.

See also rpm-software-management/rpm#2343

This patch was done while working on reproducible builds for openSUSE.

[eli-schwartz]

This whole file is actually just entirely wrong as it doesn't delegate to %_ninja_build.

[bmwiedemann]

If there was a PR for your proposal, I could test it.

[DimStar77]

This whole file is actually just entirely wrong as it doesn't delegate to %_ninja_build.

imho, using %ninja_build would not be what one would expect.

%meson_build delegates the task to ninja by meson's code:

[  320s] INFO: autodetecting backend as ninja

If a packager wishes to rely on ninja_build, they could, but most distros will want to rely on meson/meson_build/meson_install as a default workflow

[eli-schwartz]

If a packager wishes to rely on ninja_build, they could, but most distros will want to rely on meson/meson_build/meson_install as a default workflow

It is very interesting you should say that. The timing, especially.

Because I just had this conversation at muon-build/muon#148 (comment)