65 lines
3.8 KiB
Markdown
65 lines
3.8 KiB
Markdown
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# Rust 1.90 Windows readiness audit
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The locked Windows runtime/build dependency declarations do not rule out the
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workspace's Rust1.90 minimum. This is a declaration audit and toolchain preparation,
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not a successful MSRV compilation or runtime claim.
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Fresh `cargo metadata --locked --offline --format-version 1 --filter-platform
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x86_64-pc-windows-gnullvm` was collected with the existing task-local stable toolchain.
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Starting at `oa-desktop` and `oa-server`, traversal of selected normal/build dependency
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edges yields **266 packages**:183 declare `rust_version`,83 do not. None declares a
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minimum above1.90. Highest external declaration is `ordered-float 5.5.0:1.90`;
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Iced0.14, wgpu27.0.1 and the selected ICU2.3 packages declare1.88.
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Missing or inaccurate declarations and project source compatibility still require
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an actual compiler check. Dev-only and non-Windows target dependencies are outside
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this runtime declaration count.
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Provenance is retained under `.local/msrv-readiness/`: target-filtered metadata,
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selected package names/versions/manifests/minima, summary, download manifest and
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installation logs. Cargo.lock SHA256:
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`E7B95AFAC40A11823FA68D615FCAD97DEEB878C8FA1E83B28561BE5A81896112`.
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No dependency, source, workspace target or global configuration was changed.
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## The exact requested host triple is unavailable in Rust1.90
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`rustup toolchain install 1.90.0-x86_64-pc-windows-gnullvm --profile minimal
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--no-self-update` failed with “target ... not found in channel”. The official
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[Rust1.90 distribution manifest](https://static.rust-lang.org/dist/channel-rust-1.90.0.toml)
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contains gnullvm target standard libraries, but no gnullvm-host rustc/cargo packages.
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The [Rust1.91 release announcement](https://blog.rust-lang.org/2025/10/30/Rust-1.91.0/)
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records promotion of Windows gnullvm to host-tools support. Raising the declared
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MSRV merely to use this host triple would confuse host packaging with language/
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library compatibility.
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The viable preparation uses `1.90.0-x86_64-pc-windows-gnu` as compiler host and adds
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`x86_64-pc-windows-gnullvm` target libraries. Installation was launched using the
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existing task-local Rustup homes under `.local/toolchain`, minimal profile,
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`--no-self-update`, and explicit target. Installation completed successfully.
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`rustup run` reports rustc1.90.0 (`1159e78c4`, LLVM20.1.8) and cargo1.90.0
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(`840b83a10`). Installed targets include both GNU and gnullvm. Exact version output
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and compiler hashes are in `installed-provenance.txt` and `compiler-hashes.json`
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in the ignored audit directory. The task environment still selects stable gnullvm,
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and Rustup's pre-existing GNU default/settings remain unchanged.
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## Subsequent verification, owned by the root build operator
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After installation, dot-source `.local/toolchain/env.ps1`, invoke the compiler using
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an explicit `+1.90.0-x86_64-pc-windows-gnu`, and pass the explicit gnullvm target.
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Use a separate task-local target directory to avoid invalidating the current
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stable/native acceptance artifacts. For example, once target ownership is granted:
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```powershell
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. .local/toolchain/env.ps1
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$env:CARGO_TARGET_DIR = Join-Path (Get-Location) '.local/target-msrv190'
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cargo +1.90.0-x86_64-pc-windows-gnu check --locked --workspace --all-targets --target x86_64-pc-windows-gnullvm
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```
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That check includes test code/dependencies and can reveal gaps beyond this runtime
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declaration audit. An actual build/link and appropriate tests are still needed
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before asserting MSRV support. The existing clang linker configuration applies to
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the gnullvm target; GNU host build scripts/proc macros use the installed GNU host
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toolchain. Linux/Docker Rust1.90 remains a separate platform verification gate.
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After this preparation, the user enabled WSL; the root operator may prefer a
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Linux1.90 check before allocating a second Windows compilation tree. No MSRV Cargo
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compilation was started by this audit.
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