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CLOSED as NEXTRELEASE -> change is completed and verified and will be delivered in next release under development
CLOSED as NEXTRELEASE -> change is completed and verified and will be delivered in next release under development
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* Tracker bug: <will be assigned by the Wrangler>
* Tracker bug: [https://bugzilla.redhat.com/show_bug.cgi?id=1787374 #1787374]
* Release notes tracker: <will be assigned by the Wrangler>
* Release notes tracker: [https://pagure.io/fedora-docs/release-notes/issue/425 #425]


== Detailed Description ==
== Detailed Description ==
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All llvm sub-projects in Fedora will be updated to version 10. Compatibility packages clang9.0 and llvm9.0 will be added to ensure that packages that currently depend on clang and llvm version 9 libraries will continue to work.
All llvm sub-projects in Fedora will be updated to version 10, and there will be a soname version change for the llvm libraries. Compatibility packages clang9.0 and llvm9.0 will be added to ensure that packages that currently depend on clang and llvm version 9 libraries will continue to work.


== Benefit to Fedora ==
== Benefit to Fedora ==
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<!-- What work do the feature owners have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
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* Other developers:  
* Other developers:  
** Maintainers of packages that depend on clang-libs or llvm-libs will need to update their spec files to depend on the clang9.0 and llvm9.0 if they want to rebuild their package and it does not work with llvm 10 yet.  (The key point here is that spec file changes are only needed if a package is going to be rebuilt after LLVM 10 is added to Fedora.  The compatibility packages will ensure that already built packages continue to work.
** Maintainers of packages that depend on clang-libs or llvm-libs will need to update their spec files to depend on the clang9.0 and llvm9.0 compatibility packages if they want to rebuild their package and it does not work with LLVM 10 yet.  The key point here is that spec file changes are only needed if a package is going to be rebuilt after LLVM 10 is added to Fedora.  The compatibility packages will ensure that already built packages continue to work.


  <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
  <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
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<!-- What work do other developers have to accomplish to complete the feature in time for release?  Is it a large change affecting many parts of the distribution or is it a very isolated change? What are those changes?-->
 
* Release engineering: [https://pagure.io/releng/issues/9099] (a check of an impact with Release Engineering is needed) <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
* Release engineering: [https://pagure.io/releng/issues/9096] (a check of an impact with Release Engineering is needed) <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
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The issue is required to be filed prior to feature submission, to ensure that someone is on board to do any process development work and testing, and that all changes make it into the pipeline; a bullet point in a change is not sufficient communication -->
The issue is required to be filed prior to feature submission, to ensure that someone is on board to do any process development work and testing, and that all changes make it into the pipeline; a bullet point in a change is not sufficient communication -->
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This can be tested using existing CI tests or tests in the %check section of spec files.  The changes should not be visible to end users so tests should behave exactly as they did before the change.
The CI tests for the llvm sub-packages in Fedora will be used to catch regressions that might be potentially introduced by the update to LLVM 10.


== User Experience ==
== User Experience ==
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End users that develop applications using the clang libraries will need to update their applications to use libclang-cpp.so instead of the individual component libraries if they want to use libraries shipped with Fedora.  This may be inconvenient, but we don't want users to continue using a configuration that is not supported by the upstream project.  Once this change is made though, the applications will see the same benefits mentioned in the "Benefits to Fedora" section.
Users will benefit from new features and bug-fixes in the latest version of LLVM.
 
End users using Fedora packages that depend on clang libraries will not need to do anything different.


== Dependencies ==
== Dependencies ==
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The following packages depend on clang-libs and will need to be updated:
This change can be made without updating any other packages.  However, as mention before, packages that need to use LLVM 9 will need to update their spec file on their first rebuild after this change.
 
* bcc
* bpftrace
* castxml
* ccls
* clazy
* gnome-builder
* ispc
* kdevelop
* lldb
* mesa
* pocl
* qt-creator
* qt5-doctools
* shiboken2
* tinygo


== Contingency Plan ==
== Contingency Plan ==


<!-- If you cannot complete your feature by the final development freeze, what is the backup plan?  This might be as simple as "Revert the shipped configuration".  Or it might not (e.g. rebuilding a number of dependent packages).  If you feature is not completed in time we want to assure others that other parts of Fedora will not be in jeopardy.  -->
<!-- If you cannot complete your feature by the final development freeze, what is the backup plan?  This might be as simple as "Revert the shipped configuration".  Or it might not (e.g. rebuilding a number of dependent packages).  If you feature is not completed in time we want to assure others that other parts of Fedora will not be in jeopardy.  -->
* Contingency mechanism: (What to do?  Who will do it?) If we are unable to migrate all dependent packages in time, then the proposal owner will postpone the final step of passing -DBUILD_SHARED_LIBS=OFF to cmake when configuring clang until a future Fedora release. In this case, packages that have already been migrated will continue to work, since libclang-cpp.so is already included in the clang-libs package.
* Contingency mechanism: (What to do?  Who will do it?) If there are major problems with LLVM 10, the compatibility package provide a way for other packages to continue using LLVM 9. In the worst case, we could always revert LLVM back to LLVM 9, but this would only happen if their were an unprecedented amount of problems.  


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* Contingency deadline: Change Checkpoint: Completion deadline <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
* Contingency deadline: Beta Freeze <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
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* Blocks release? No <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
* Blocks release? No <!-- REQUIRED FOR SYSTEM WIDE CHANGES -->
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The individual component libraries (e.g. libclangBasic.so, libclangAST.so, etc.) have been removed from the clang-libs packages.  Developers who want to link their application against the clang libraries should link against libclang-cpp.so instead.
LLVM sub-projects in Fedora have been updated to version 10:


* llvm
* clang
* lld
* lldb
* compiler-rt
* libomp
* llvm-test-suite
* libcxx
* libcxxabi
* python-lit


[[Category:ChangeReadyForWrangler]]
[[Category:ChangeAcceptedF32]]
<!-- When your change proposal page is completed and ready for review and announcement -->
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Latest revision as of 15:47, 2 January 2020


LLVM 10

Summary

Update all llvm sub-projects in Fedora to version 10.

Owner

Current status

Detailed Description

All llvm sub-projects in Fedora will be updated to version 10, and there will be a soname version change for the llvm libraries. Compatibility packages clang9.0 and llvm9.0 will be added to ensure that packages that currently depend on clang and llvm version 9 libraries will continue to work.

Benefit to Fedora

New features and bug fixes provided by the latest version of LLVM.

Scope

  • Proposal owners:
    • Review existing llvm and clang compatibility packages and orphan any packages that are no longer used.
    • Request a f32-llvm side-tag from Release Engineering.
    • Build llvm9.0 and clang9.0 into the side-tag.
    • When the upstream LLVM project releases version 10.0.0-rc1 (2020-1-15), package this and build it into the side tag.
    • Merge side-tag into rawhide prior to the f32 branch date.
    • Continue packaging newer release candidates into rawhide and f32 until the final release is complete (~2020-2-26)
  • Other developers:
    • Maintainers of packages that depend on clang-libs or llvm-libs will need to update their spec files to depend on the clang9.0 and llvm9.0 compatibility packages if they want to rebuild their package and it does not work with LLVM 10 yet. The key point here is that spec file changes are only needed if a package is going to be rebuilt after LLVM 10 is added to Fedora. The compatibility packages will ensure that already built packages continue to work.
  • Release engineering: [1] (a check of an impact with Release Engineering is needed)
  • Policies and guidelines: No policies or guidelines will need to be updated as a result of this change.
  • Trademark approval: N/A (not needed for this Change)

Upgrade/compatibility impact

This change should not impact upgradeability.

How To Test

The CI tests for the llvm sub-packages in Fedora will be used to catch regressions that might be potentially introduced by the update to LLVM 10.

User Experience

Users will benefit from new features and bug-fixes in the latest version of LLVM.

Dependencies

This change can be made without updating any other packages. However, as mention before, packages that need to use LLVM 9 will need to update their spec file on their first rebuild after this change.

Contingency Plan

  • Contingency mechanism: (What to do? Who will do it?) If there are major problems with LLVM 10, the compatibility package provide a way for other packages to continue using LLVM 9. In the worst case, we could always revert LLVM back to LLVM 9, but this would only happen if their were an unprecedented amount of problems.
  • Contingency deadline: Beta Freeze
  • Blocks release? No
  • Blocks product? None

Documentation

Release notes will be added for this change.

Release Notes

LLVM sub-projects in Fedora have been updated to version 10:

  • llvm
  • clang
  • lld
  • lldb
  • compiler-rt
  • libomp
  • llvm-test-suite
  • libcxx
  • libcxxabi
  • python-lit
Retrieved from "https://fedoraproject.org/w/index.php?title=Changes/LLVM-10&oldid=562374"