As the follow up of https://github.com/rpm-software-management/rpm/pull/813
I would like to have rpm macros that will do operations on `%optflags`:
Example:
- `%filter-out-optflags '-flto=auto'`
- `%append-if-to-optflags '-flto=auto' -ffat-lto-objects`
I found the example how currently we do it e.g. in MozillaFirefox:
```
%{expand:%%global optflags %(echo "%optflags"|sed -e s/i586/i686/) -march=i686
-mtune=generic}
```
Which is quite ugly and I bet multiple packages suffer from the same issue.
Gentoo has a reasonable API for that:
https://devmanual.gentoo.org/eclass-reference/flag-o-matic.eclass/index.html
@pmatilai Is it realistic to come up with the functionality?
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