[build] Switch lz4 submodule to upstream lz4/lz4#11671
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The `external/lz4` submodule has been pointing at `dotnet/lz4` (a fork of `lz4/lz4`) for historical reasons, but the fork carries no downstream changes -- every commit "ahead" of upstream is just a no-op merge from the periodic mirror sync. Switch the submodule to track upstream `lz4/lz4` directly so we can pick up active maintenance and security fixes when we next bump the pin. Changes: * `.gitmodules`: `url = https://github.com/lz4/lz4`, `branch = dev`. * `external/lz4` gitlink: bumped from `ebb370ca83af193212df4dcbadcc5d87bc0de2f0` (a merge commit owned by the fork) to `68959d27c3ec37b339b3b8ecfea155faf0ef94f2`, which is the upstream `dev`-side parent of that merge. The two trees are byte-identical (same root tree SHA `1ff35e0f...`), so this is a no-op for the source content. * `.github/skills/update-tpn/SKILL.md`: drop the "(fork of ...)" note on the lz4 row -- it's no longer a fork. Verified `dotnet-local.cmd build src/native/native-mono.csproj -p:Configuration=Debug` produces 0 errors and the expected `libxa-lz4-release.a` for all four ABIs (`android-arm`, `android-arm64`, `android-x64`, `android-x86`). This supersedes dotnet#11658, which had vendored the lz4 sources into `src-ThirdParty/lz4/`; that approach was abandoned in favor of this simpler submodule URL switch. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Pull request overview
This PR repoints the external/lz4 submodule from the inactive dotnet/lz4 fork to the upstream lz4/lz4 repository, keeping the checked-in source content effectively the same while enabling future updates to track upstream maintenance/security fixes.
Changes:
- Update
.gitmodulesto usehttps://github.com/lz4/lz4and track thedevbranch for theexternal/lz4submodule. - Update the update-TPN skill inventory to reflect the new upstream URL for lz4.
- (As described) Move the
external/lz4gitlink to the upstream commit that matches the fork’s merge-parent content.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
.gitmodules |
Switch external/lz4 submodule URL to upstream lz4/lz4 and set tracking branch to dev. |
.github/skills/update-tpn/SKILL.md |
Update the documented submodule URL for lz4 to match the new upstream location. |
external/lz4 |
Update the submodule gitlink to the corresponding upstream commit (content-equivalent to the previously pinned fork merge). |
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Summary
The
external/lz4submodule has been pointing atdotnet/lz4(a fork oflz4/lz4) for historical reasons. The fork carries zero downstream changes -- every commit "ahead" of upstream is just a no-op merge from the periodic mirror sync. This PR switches the submodule to track upstreamlz4/lz4directly so we can pick up active maintenance and security fixes when we next bump the pin.Verification: the fork has no custom changes
Confirmed via:
→
ahead_by=5, behind_by=0, files-changed=0. The 5 "ahead" commits are all merge commits with no file changes; last sync was July 2024.Changes
.gitmodules:url = https://github.com/lz4/lz4,branch = dev.external/lz4gitlink: bumped fromebb370ca83af193212df4dcbadcc5d87bc0de2f0(a merge commit owned by the fork) to68959d27c3ec37b339b3b8ecfea155faf0ef94f2, which is the upstreamdev-side parent of that merge. The two trees are byte-identical (same root tree SHA1ff35e0f086e3b431ea0efd001eb5c6254561953), so this is a no-op for the source content..github/skills/update-tpn/SKILL.md: drop the "(fork of ...)" note on the lz4 row -- it's no longer a fork.THIRD-PARTY-NOTICES.TXTis left alone -- the existinglz4/lz4block is already correctly attributed to upstream.Build verification
Produces 0 errors (81 unrelated warnings) and the expected
libxa-lz4-release.aartifacts for all four ABIs:android-armandroid-arm64android-x64android-x86Related
Supersedes #11658, which had vendored the lz4 sources into
src-ThirdParty/lz4/; that approach was abandoned in favor of this simpler submodule URL switch.