[ Impact ]
* Installing binary packages from llvm-toolchain-19 fails with an APT
dependency error: liboffload-19-dev declares
`Breaks: libomp-19-dev (< 1:20241205084449+66a0a081338d)` using a
snapshot version epoch. Because snapshot versions sort higher than any
published real release, APT refuses to install libomp-19-dev alongside
liboffload-19-dev on any Ubuntu release.
* Fix: replace the snapshot version with the correct real-release version
`1:19.1.7-11` in d/control.in.
* A second fix works around a cmake 4 FTBFS in the wasm compiler-rt build
stage by patching two generated cmake files at build time.
[ Test Plan ]
1. Download all binary debs from resolute-proposed for llvm-toolchain-19.
2. Attempt to install them all: `apt-get install ./*.deb`
Before fix: APT error about liboffload-19-dev Breaks libomp-19-dev.
After fix: installation succeeds without dependency errors.
3. Confirm `clang-19 --version` and `llvm-19 --version` return expected output.
4. A source build with cmake 4 should complete without cmake policy errors.
[ Where problems could occur ]
* Breaks/Replaces version fix: If `1:19.1.7-11` is set too conservatively,
an intermediate installed libomp-19-dev that is actually incompatible with
liboffload-19-dev might not be flagged by APT. Low risk, as resolute never
shipped intermediate snapshot builds to users.
* All changes are packaging-only; no compiled code or installed files changed.
[ Other Info ]
* Due to Launchpad infrastructure issues, the autopkgtests haven't all
succeeded.
However, I've seen successes on at least some platforms and so anticipate no
problems.
* Both fixes are packaging-only (d/control.in, d/rules); no upstream changes.
* The cmake 4 workaround mirrors what is present in Debian and the devel
release.
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https://bugs.launchpad.net/bugs/2139024
Title:
APT incompatibility between liboffload-19-dev and libomp-19-dev
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