Stop pulling dependencies for static libraries

Summary

Since day 0, RPM dependency generator for pkg-config files was pulling in both Requires and Requires.private. We will change generator to pull Requires.private only if static library is actually packaged.

Owner

Name: Igor Gnatenko
Email: ignatenkobrain@fedoraproject.org
Release notes owner:

Current status

Targeted release: Fedora 30
Last updated: 2018-08-12
Tracker bug: <will be assigned by the Wrangler>

Detailed Description

Requires.private is only used when using pkg-config --static to link statically. Most of the packages in fedora don't ship static libraries and Packaging Guidelines discourage packaging them.

The idea is to make them conditional by using rich dependencies which will change things like pkgconfig(x11) to (pkgconfig(x11) if pkgconfig-static(gdk-3.0)).

Alternatively/Additionally we could do a switch which will make generator to not generate such requirements.

Benefit to Fedora

This change makes dependency chain of -devel packages providing pkg-config smaller and additionally make metadata smaller.

Scope

Proposal owners: Adjust dependency generator to do the right thing, update packaging guidelines.

Other developers: Package maintainers which ship static library will need to update their packages with new packaging policy.

Release engineering: #Releng issue number (a check of an impact with Release Engineering is needed)
- List of deliverables: N/A (not a System Wide Change)

Policies and guidelines: Guidelines need to be updated (not more that 1-2 paragraphs).

Trademark approval: N/A (not needed for this Change)

Upgrade/compatibility impact

dnf autoremove will remove useless packages from end-user systems. Users might be confused by that.

How To Test

TBD.

User Experience

See "Benefit to Fedora"

Dependencies

Need to patch pkgconfig dependency generator in rpm and possibly add some macro in redhat-rpm-config package.

Contingency Plan

Contingency mechanism: Proposal owners will revert patches, rebuild affected packages and postpone change to next release.
Contingency deadline: Beta freeze.
Blocks release? No.
Blocks product? product

Documentation