[Bug 277902] Mk/Uses/cargo.mk: WITH_LTO no longer applies

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277902

Gleb Popov <arrowd@FreeBSD.org> changed:

           What    |Removed                     |Added
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             Status|New                         |Open

--- Comment #2 from Gleb Popov <arrowd@FreeBSD.org> ---
Yes, this happens because Uses are .include'd earlier than Features.

What I think the problem of Mk/Uses/cargo.mk is that it appends LTO flags based
on USES file inclusion. I don't quite see why we're doing that.

I'd rather change Mk/Uses/cargo.mk to unconditionally set special LTO-related
knobs for each language/buildsystem and then consume them in the appropriate
USES code.

I'm happy to do the change if the proposed solution looks good.

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