Re: Applying code layout optimization to postgresql16 RPMs in Fedora 41 gave a 3%-6% improvement in IPC

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On Thu, Dec 05, 2024 at 03:45:59PM +0100, Miro Hrončok wrote:
> What is the blocker to run this in Koji/mock?
> 
> You do `make_sediment_rpmmacros > ~/.rpmmacros`.
> 
> What's the issue with %defining such macros at spec level?

I don't think the approach with 'make_sediment_rpmmacros' can work.
It attempts to extend %build_clags and %build_ldflags, but it evaluates
those flags in some environment which might be different than the
rpmbuild environment. For example, if %name is defined, we also
get -specs=/usr/lib/rpm/redhat/redhat-package-notes in %build_ldflags.
make_sediment_rpmmacros sets %build_ldflags that doesn't have that.

I think it's better to just let users explictly call some macro at the
beggining of %build that'll handle modifying CLFAGS/LDFLAGS/… and call
gv2link.

This would be clearer and should work in local builds, mock, and koji.

Zbyszek
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