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appimage: bundle the shared libraries lld depends on (libxml2, ICU) - #151
thomasczer wants to merge 4 commits into
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe portable-tool preparation script bundles private dependencies for LLVM, CMake, and Ninja. It applies RPATHs, records licenses, verifies dependency resolution, and blocks release publication until recompilation tests pass. ChangesPortable dependency handling
Estimated code review effort: 4 (Complex) | ~45 minutes Sequence Diagram(s)sequenceDiagram
participant PackagingWorkflow
participant PreparationScript
participant Ldd
participant ToolchainBundle
participant Recompilation
PackagingWorkflow->>PreparationScript: Prepare portable tools
PreparationScript->>Ldd: Inspect tool dependencies
Ldd-->>PreparationScript: Return dependency paths
PreparationScript->>ToolchainBundle: Copy private libraries and set RPATH
PreparationScript->>Ldd: Verify bundled executable resolution
Ldd-->>PreparationScript: Report resolved library locations
PackagingWorkflow->>Recompilation: Run recompilation tests
Recompilation-->>PackagingWorkflow: Return test status
Suggested reviewers: Merge Risk: ⚪ Minimal · up to The portable toolchain now bundles and verifies required shared libraries, with packaging publication gated on recompilation. No concrete current-head merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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In `@Launcher/prepare-portable-tools.sh`:
- Line 152: Update the baseline_sonames definition so it classifies only
glibc-provided libraries as host baseline dependencies; remove libstdc++,
libgcc_s, libz, and liblzma from the pattern so they are bundled and included in
final resolution checks.
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Since #141 has now switched main back to clang-22 can you reevaluate this pr? could you also make the dependency checks explicitly fail if |
thomasczer
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Re-evaluated against 22.1.8 and rebased on main. It matters more there, not less: LLVM 22's That changes one thing in the approach: each copied library now gets a On the ldd point: both the bundling step and the final check now fail hard when the executable is missing or The PR description has the verification table for both the LLVM 22 and LLVM 23 toolchains; the ICU-only story in the title and comments is replaced accordingly. |
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Inline comments:
In `@Launcher/prepare-portable-tools.sh`:
- Line 172: Update the baseline_sonames pattern to remove libstdc++ from its
excluded baseline libraries, so dependency collection and final ldd verification
bundle and validate libstdc++.so.6 with the LLVM tools.
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@thomasczer @patchzyy upstream is actively working on the real fix for this now. nothing to do on our end but wait for that to be merged. issue: llvm/llvm-project#215764 In the meantime, users of course can do a local-build.sh (but require all the build time dependencies/headers to be available) |
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Agreed that the upstream change is the right long-term fix, with two caveats worth having on record before deciding to wait:
Your call of course, @patchzyy. |
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On 1: v0.2.28, built on 22.1.8, fails on Arch/CachyOS today with On 2: Happy to be shown a host where either of those does not hold. |
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@patchzyy, a status update after five days, since things moved on both sides of this. Current releases are still broken. v0.2.31 ships LLVM 22.1.8, whose Upstream has no date. LLVM 23.1.1 (2026-09-08) still contains the static-libxml/ICU commit, so it fails the same way as 23.1.0. The fix, llvm/llvm-project#221365, is still open on The Wheel Wizard Flatpak does not paper over it. On your note in #136: the Flathub build runs on Same failure as on Arch, and the runtime's ICU 77 means an LLVM 23.1.x With this PR's bundling applied to the same v0.2.31 toolchain ( This PR is mergeable against |
The lld binary in the llvm.org Linux release tarball is dynamically
linked against Ubuntu 22.04's ICU (libicui18n/libicuuc/libicudata
.so.70). The tarball does not ship them and neither did the AppImage,
so on any distro with a different ICU major (Arch/CachyOS 78, Fedora and
Debian 13 76, Ubuntu 24.04 74) `ld.lld` cannot start:
ld.lld: error while loading shared libraries: libicui18n.so.70:
cannot open shared object file: No such file or directory
and CMake's "Check for working C compiler" aborts the whole install.
The smoke test in prepare-portable-tools.sh never caught it because it
runs on the very Ubuntu 22.04 runner that has ICU 70 installed.
lld already carries a $ORIGIN/../lib RUNPATH, so copying the libraries
into the toolchain's lib/ is enough - no rpath patching, no
LD_LIBRARY_PATH in AppRun. The copy is driven by ldd on the build host
rather than a hardcoded list, is applied to every bundled executable,
and a new check before the smoke test fails the build if any of them
resolves a non-glibc-baseline library from outside the bundle.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
…ided Review asked for them to be bundled alongside ICU. They are kept as host baseline on purpose: the AppImage excludelist names libstdc++.so.6, libgcc_s.so.1 and libz.so.1 as libraries never to bundle, every glibc distro ships them under these sonames, and the LLVM binaries' floor (GLIBC_2.34 / GLIBCXX_3.4.30) is met by any distro whose glibc can load them at all. ICU is the odd one out because its soname changes on every major release. Comment-only change. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Re-evaluated against LLVM 22.1.8 (main since #141): its lld does not need ICU but libxml2.so.2, which Arch (libxml2 >= 2.14), Fedora and Ubuntu 25.10+ no longer ship - the exact failure in #136. Ubuntu's libxml2 in turn links ICU 70, so the transitive closure has to travel with the bundle as well. - bundle_private_deps now sets a $ORIGIN RUNPATH on every library it copies (patchelf): the loader resolves a library's own dependencies through that library's RUNPATH, not the executable's, so without it libxml2 -> libicuuc would be looked up on the host again. - A missing executable or a failing ldd is an error, never a silent pass, in both the bundling step and the final verification; a static executable ("not a dynamic executable") is tolerated. ldd runs under LC_ALL=C so that text is matched on localized hosts too. - Verification runs ldd with LD_LIBRARY_PATH unset and distinguishes "resolved from the host" from "not found at all". - patchelf added to the AppImage runner's apt-get list; the script refuses to run without it. - LICENSE.txt lists whatever ended up in lib/ plus the libxml2 and ICU licenses. Verified on the toolchains extracted from v0.2.26 (LLVM 22) and v0.2.27 (LLVM 23): with the Ubuntu 22.04 libxml2/libicu70 packages standing in for the runner's /usr/lib, bundling copies exactly {libxml2, libicuuc, libicudata} resp. {libicui18n, libicuuc, libicudata}, the verification passes with LD_LIBRARY_PATH unset, clang -fuse-ld=lld links and runs a program on CachyOS (libxml2.so.16 / ICU 78 host), and removing one bundled library makes the verification fail. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Review pointed out a real hole in the "host baseline" argument: the LLVM binaries want GLIBCXX_3.4.30 (GCC 12) while RHEL 9 / Rocky / Alma / Amazon Linux 2023 ship a glibc new enough for them (2.34) but GCC 11's libstdc++, which stops at GLIBCXX_3.4.29. There the tools would die with "version GLIBCXX_3.4.30 not found". Ubuntu 22.04's libstdc++ (GCC 12.3) needs nothing newer than GLIBC_2.34 itself, so bundling it keeps the glibc floor where it is. The AppImage excludelist's reason for leaving libstdc++ to the host (dlopen'ed host libraries, GPU drivers) does not apply to a compiler and linker that dlopen nothing. - libstdc++ removed from baseline_sonames; libgcc_s/libz/liblzma stay (the symbol versions wanted from them are decades old). - bundle_private_deps now also gives the executable itself a $ORIGIN/../lib RUNPATH when it has non-baseline dependencies and no such entry yet: the LLVM binaries already have it, the ninja release binary does not and would otherwise keep loading the host libstdc++. - LICENSE.txt gains the libstdc++ license. Same harness as before, both LLVM 22 and LLVM 23 toolchains: lib/ now holds libstdc++.so.6 alongside libxml2/ICU, every copy carries $ORIGIN, ninja gets $ORIGIN/../lib, cmake is untouched, verification passes with LD_LIBRARY_PATH unset, link+run works on CachyOS. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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@thomasczer I have a resolution for this so this PR can probably be closed. Been working on it in the past 2 days outside of any PR to Wiicompiled. The resolution is to backport the changes still in progress to really fix LLVM main back to 22.1.8 (no libxml dependency, no icu dependency). 23.X appears to have a bug which causes retrorewind to hang during compilation #208 can't use 23.X until that new bug is fixed upstream. The patched LLVM 22.1.8 build is being built by the official LLVM github actions (as part of their PR bot) as we speak. https://github.com/llvm/llvm-project/actions/runs/34549173201?pr=222821 . The Wiicompiled buildscript change to point to those new LLVM assets is just pending that CI finishing in a few hours and I'll probably push tomorrow given the time of day it will finish. The changes are very minimal compared to this PR, just a download location change to the appimage buildscript, that is it. |
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Tested the Same result on the CachyOS host (libxml2 2.15 / ICU 78) and inside the Wheel Wizard 2.5.4 Flatpak, which is exactly the step that fails with v0.2.31. So the patched 22.1.8 build does fix #136 for the distributions this PR targets. Good news, and thanks for getting it through the LLVM CI. I would keep this PR open until the switch has shipped in a release and been confirmed on Arch/Fedora, then close it. In the meantime, since the toolchain has changed four times in ten days, it would help to have a concrete plan written down: which LLVM version is targeted and for how long (patched 22.1.8 until the libxml fix is in a 23.x release and #208 is understood?), where the binaries live and who rebuilds them if that becomes necessary, and what happens if the upstream PR takes months. Happy to help with any of it, including landing the |
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The above PR does what I said it would do so this can be closed. The commit message + embedded comments in the code from my PR explain what is required to switch back to an official llvm release in the future. |
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Looked at #214. One thing worth having on record: I downloaded both the As said above, I'd close this once #214 is merged and a release built from it has been confirmed on Arch/Fedora, since that is the failure #136 reports and no release has been cut yet. If that is fine with you both, I'll close it myself at that point. One thing #214 does not carry over from here is the post-packaging |
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Fixes #136. Fixes #150.
Problem
The
lldbinary in the llvm.org Linux release tarball is dynamically linked against libraries of the Ubuntu 22.04 it is built on, which neither the tarball nor the AppImage ship:libxml2.so.2. Arch (libxml2 ≥ 2.14), Fedora and Ubuntu 25.10+ only shiplibxml2.so.16, sold.lldcannot start there. This is [Install] Can't compile on linux with the appimage #136.libicui18n/libicuuc/libicudata.so.70). Every other distro has a different ICU major. This is [Install] Linux AppImage: ld.lld fails to start on non-Ubuntu-22.04 hosts (libicui18n.so.70 missing) #150 and LLVM 23.1.0-rc3 ld bug libicui18n.so.70 on Ubuntu 26.04 llvm/llvm-project#215764.Either way the symptom is
ld.lld: error while loading shared libraries: ...and CMake's "Check for working C compiler" aborting the install. The smoke test inprepare-portable-tools.shnever caught it because thepackage.ymlrunner isubuntu-22.04, which has all of these in/usr/lib. Same for aarch64.Fix
Launcher/prepare-portable-tools.sh:bundle_private_deps: runslddon a bundled executable and copies every library outside a glibc baseline (libc,libm,libdl,libpthread,librt,libgcc_s,libz,liblzma,ld-linux) intolib/, symlink-dereferenced, under its soname.lddprints the whole transitive closure, so Ubuntu'slibxml2 → libicuuc → libicudatacomes along. Driven bylddrather than a hardcoded list so an LLVM bump that links something else is picked up, and so a dependency the build host cannot resolve fails there instead of on a user's machine.$ORIGINRUNPATH viapatchelf: the loader resolves a library's own dependencies through that library's RUNPATH, not the executable's, so without itlibxml2's ICU would be looked up on the host again. An executable with non-baseline dependencies gets a$ORIGIN/../libRUNPATH if it has none: the LLVM binaries already carry it, the ninja release binary does not.clang-22,lld,llvm-ar,cmake,ninja). Today onlylldneeds anything.ldd(withLD_LIBRARY_PATHunset,LC_ALL=C) must resolve every non-baseline library to a path under the bundle. A missing executable or a failinglddis an error, never a silent pass; a static executable is tolerated. "Resolved from the host" and "not found at all" are reported distinctly.patchelfis required (checked up front) and added to the runner'sapt-getlist inpackage.yml.LICENSE.txtlists whatever ended up inlib/plus the libstdc++, libxml2 and ICU licenses.libstdc++is bundled too (review caught this, I had it wrong at first): the LLVM binaries wantGLIBCXX_3.4.30(GCC 12) while RHEL 9 / Rocky / Alma / Amazon Linux 2023 ship a glibc new enough for them (2.34) but GCC 11's libstdc++, which stops at3.4.29. Ubuntu 22.04's libstdc++ needs nothing newer thanGLIBC_2.34itself, so bundling it keeps the glibc floor where it is, and the excludelist's reason for leaving it to the host (dlopen'ed GPU drivers) does not apply to a compiler and linker.libgcc_s,libzandliblzmastay host-provided: universal sonames, and the symbol versions wanted from them are decades old. The comment abovebaseline_sonamesspells this out.Adds ~37 MiB uncompressed to a ~500 MiB toolchain, most of it
libicudata.Verification
I cannot run the full script here (no Ubuntu 22.04 host), so this was done against the toolchains extracted from the released AppImages, with the Ubuntu 22.04
libstdc++6,libxml2andlibicu70packages standing in for the runner's/usr/libviaLD_LIBRARY_PATHduring the bundling step only:clang-22)clang-23)lib/libstdc++.so.6,libxml2.so.2,libicuuc.so.70,libicudata.so.70libstdc++.so.6,libicui18n.so.70,libicuuc.so.70,libicudata.so.70$ORIGIN$ORIGIN$ORIGIN/../lib),ninjagains$ORIGIN/../lib,cmakeuntouchedLD_LIBRARY_PATHunsetldd lldon CachyOS (libxml2.so.16 / ICU 78 host)bin/../lib/bin/../lib/clang -fuse-ld=lldlink + run, noLD_LIBRARY_PATHlibicuuc.so.70fromlib/lld cannot resolve libicuuc.so.70 at allError paths: a nonexistent executable fails with
is missing or not executable; a non-ELF file is reported bylddas not dynamic and skipped. TheLC_ALL=Ccame out of that test: my machine's Frenchlddsays "n'est pas un exécutable dynamique" and the match silently failed.Separately, the full
installof base + Retro Rewind completed on this machine with the same libraries provided viaLD_LIBRARY_PATH, which is the resolution the RUNPATHs now give.🤖 Generated with Claude Code
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