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Description of problem:

  With the introduction of the annobin gcc plugin to the build process,
  built binary files have become larger.  Sometimes significantly so.
  This is a request to add a new step to the post-link process performed
  by rpmbuild, to run the objcopy program with the --merge-notes option
  specified.  This will reduce the size of the annobin notes in binary 
  files, thus alleviating the size growth.

Things like this generally need to be done in Fedora first.

(In reply to Panu Matilainen from comment #2)
> Things like this generally need to be done in Fedora first.

OK, in which case I have filed a Fedora rawhide bug:

https://bugzilla.redhat.com/show_bug.cgi?id=1720700

Accepted upstream: https://github.com/rpm-software-management/rpm/pull/751

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2020:1835