Add new intermediate boolean variables for each dependency and each dependency feature declared in a package.
This is used to simplify computation of the sat clauses.
Add support for multiple dependencies with the same name, if their kind or target is different.
A non-weak dependency feature for an optional dependency now activates a feature of the same name in the sat resolver.
To implement rust-lang/rfcs#3516, we need to decouple the resolver's
behavior from the unstable flag. Since the code path is now dead, I
went ahead and removed it.
This is an alternative to `-Zminimal-versions` as discussed in #5657.
The problem with `-Zminimal-versions` is it requires the root most
dependencies to verify it and we then percolate that up the stack. This
requires a massive level of cooperation to accomplish and so far there
have been mixed results with it to the point that cargo's unstable
documentation discourages its use.
`-Zdirect-minimal-versions` instead only applies this rule to your
direct dependencies, allowing anyone in the stack to immediately adopt
it, independent of everyone else.
Special notes
- Living up to the name and the existing design, this ignores yanked
crates. This makes sense for `^1.1` version requirements but might
look weird for `^1.1.1` version requirements as it could select
`1.1.2`.
- This will error if an indirect dependency requires a newer version.
Your version requirement will need to capture what you use **and** all
of you dependencies. An alternative design would have tried to merge
the result of minimum versions for direct dependencies and maximum
versions for indirect dependencies. This would have been complex and
led to weird corner cases, making it harder to predict. I also suspect
the value gained would be relatively low as you can't verify that
version requirement in any other way.
- The error could be improved to call out that this was from minimal
versions but I felt getting this out now and starting to collect
feedback was more important.
There is a soundness issue with atty when building on Windows with a
custom allocator.
This PR switches direct dependencies on atty to is-terminal. New semver
compatible versions of clap and snapbox remove atty. #11417 upgrades
env_logger to remove it from there.
Fixes#11415
`nightly_features_allowed()` is no longer doing any work, so it can be
accessed directly. This also renames the `enable_nightly_features` field
to `nightly_features_allowed`.
Previously, since `ENABLE_NIGHTLY_FEATURES` and
`NIGHTLY_FEATURES_ENABLED` were thread locals, reading them in any other
thread would always say nightly features were disabled. Now, they are
tied to the `Context` itself, so it is both more clear how the variables
are being set and fixes the behavior within work threads.
Note that `Context` is not thread-safe, so this passes a boolean through
to `BuildOutput::parse`.
First reported in rust-lang/rust#65014 it looks like our error message
on cyclic dependencies may be confusing at times. It looks like this is
an issue because there are multiple paths through a graph for a
dependency, so using the generic `path_to_top` function isn't producing
the most useful path for this purpose.
We're already walking the graph though, so this commit adds an extra
parameter which collects the list of packages we've visited so far to
produce a hopefully always-accurate error message showing the chain of
dependencies end-to-end for what depends on what.
These tests take a good amount of time to run locally and they're also
causing a lot of dependencies to get pulled into rust-lang/rust, so
let's have a separate crate that we just test on our own CI
