CI: Check MSRV in CI (#37152)

As previously proposed on zulip and discussed in the coordination
meeting, add a check to CI to see if
servo still compiles with our minimum supported Rust version.
To avoid requiring changes, we define our MSRV as the current version we
are using now (1.85.0).

This does not prevent us from updating the default compiler version,
which we should still do, to
get benefits like faster compile times, newer lints and making sure
crown stays up-to-date.

We simply test that libservo compiles in CI, since libservo (and
dependencies) is what embedders would care about. We also don't need
mach (or bootstrap!) for this, so we just use cargo build.

Testing: This PR adds a CI test. [`./mach try windows-build-libservo
linux-build-libservo
mac-build-libservo`](https://github.com/jschwe/servo/actions/runs/16901171766)

Signed-off-by: Jonathan Schwender <schwenderjonathan@gmail.com>
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Jonathan Schwender 2025-08-12 21:19:45 +02:00 committed by GitHub
parent 6ff5c4ef99
commit 4b91dc6d82
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6 changed files with 125 additions and 18 deletions

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@ -13,6 +13,11 @@ authors = ["The Servo Project Developers"]
license = "MPL-2.0"
edition = "2024"
publish = false
# We have yet to decide on a policy for updating the minimum supported rust version.
# Before increasing this, please open a discussion on zulip explaining the reason
# why we should consider increasing our minimum supported rust version.
# Please also note, that the **default** rust version in rust-toolchain.toml may be
# bumped freely.
rust-version = "1.85.0"
[workspace.dependencies]