[Rpm-maint] [rpm-software-management/rpm] Come up with %_smp_flto macro that expands in a similar way to _smp_mflags. (#606)

[marxin]

> That's indeed much better, thanks. There's still the naming mismatch with the concept though: %_smp_flto enables LTO regardless of number of cpus, and flto is the name of the compiler switch, the feature is simply LTO. Maybe it should be %_lto_mflags instead?

Yep, sounds better to me as well!
> 
> How you envision this gets used in practise - is it something that eg distros might want to enable by default some day, or is it strictly per-spec thing?

Yes, I'm preparing openSUSE Factory for that.

> Just thinking whether there should be some integration with %make_build for example.

We're planning to enable that via ```$optflags``` where we'll add the new ```%_lto_mflags```.


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