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Don't synthesize feature directives for non-optional deps #7010

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merged 1 commit into from
Jun 5, 2019

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Currently when Cargo is invoked on the command like cargo build --features foo/bar then it will actually always compile the current
crate with feature = "foo" even if foo is a non-optional dependency.
This isn't intended because the crate doesn't actually have a foo
feature as so no directive should be emitted or passed to the compiler.

This was discovered in rust-lang/rust where Cargo is being built with
the rustc-workspace-hack feature but when the RLS depends on Cargo it
doesn't enable the same feature. This feature, however, doesn't actually
exist for Cargo!

Currently when Cargo is invoked on the command like `cargo build
--features foo/bar` then it will actually always compile the current
crate with `feature = "foo"` even if `foo` is a non-optional dependency.
This isn't intended because the crate doesn't actually have a `foo`
feature as so no directive should be emitted or passed to the compiler.

This was discovered in rust-lang/rust where Cargo is being built with
the `rustc-workspace-hack` feature but when the RLS depends on Cargo it
doesn't enable the same feature. This feature, however, doesn't actually
exist for Cargo!
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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jun 5, 2019
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ehuss commented Jun 5, 2019

@bors r+

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bors commented Jun 5, 2019

📌 Commit dbc2c2b has been approved by ehuss

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jun 5, 2019
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bors commented Jun 5, 2019

⌛ Testing commit dbc2c2b with merge 24439f8...

bors added a commit that referenced this pull request Jun 5, 2019
Don't synthesize feature diretives for non-optional deps

Currently when Cargo is invoked on the command like `cargo build
--features foo/bar` then it will actually always compile the current
crate with `feature = "foo"` even if `foo` is a non-optional dependency.
This isn't intended because the crate doesn't actually have a `foo`
feature as so no directive should be emitted or passed to the compiler.

This was discovered in rust-lang/rust where Cargo is being built with
the `rustc-workspace-hack` feature but when the RLS depends on Cargo it
doesn't enable the same feature. This feature, however, doesn't actually
exist for Cargo!
@bors
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bors commented Jun 5, 2019

☀️ Test successful - checks-travis, status-appveyor
Approved by: ehuss
Pushing 24439f8 to master...

@bors bors merged commit dbc2c2b into rust-lang:master Jun 5, 2019
@alexcrichton alexcrichton deleted the less-features branch June 5, 2019 19:43
Centril added a commit to Centril/rust that referenced this pull request Jun 12, 2019
Update cargo

Update cargo

19 commits in 545f354259be4e9745ea00a524c0e4c51df01aa6..807429e1b6da4e2ec52488ef2f59e77068c31e1f
2019-05-23 17:45:30 +0000 to 2019-06-11 14:06:10 +0000
- Stabilize publish-lockfile. (rust-lang/cargo#7026)
- change package cache lock message (rust-lang/cargo#7029)
- Fix documenting an example. (rust-lang/cargo#7023)
- Fix nonconcurrent tests (rust-lang/cargo#6900)
- Update git2 crates for libgit2 0.28 (rust-lang/cargo#7018)
- fix bunch of clippy warnings (rust-lang/cargo#7019)
- Ignore remap-path-prefix in metadata hash. (rust-lang/cargo#6966)
- Don't synthesize feature diretives for non-optional deps (rust-lang/cargo#7010)
- Handle pipelined tests of libraries (rust-lang/cargo#7008)
- Import the cargo-vendor subcommand into Cargo (rust-lang/cargo#6869)
- Remove unnecessary outlives bounds (rust-lang/cargo#7000)
- Catch filename output collisions in rustdoc. (rust-lang/cargo#6998)
- the testing SAT solver was messed up by a refactor (rust-lang/cargo#6995)
- Add some hints to the docs for `cfg()` targets (rust-lang/cargo#6990)
- Test the Resolver against the varisat Library (rust-lang/cargo#6980)
- Update changelog. (rust-lang/cargo#6984)
- Update cache-messages tracking issue. (rust-lang/cargo#6987)
- zsh: Add --all-targets option to cargo-check and cargo-build (rust-lang/cargo#6985)
- Fix typo (rust-lang/cargo#6982)
Centril added a commit to Centril/rust that referenced this pull request Jun 14, 2019
Update cargo

Update cargo

19 commits in 545f354259be4e9745ea00a524c0e4c51df01aa6..807429e1b6da4e2ec52488ef2f59e77068c31e1f
2019-05-23 17:45:30 +0000 to 2019-06-11 14:06:10 +0000
- Stabilize publish-lockfile. (rust-lang/cargo#7026)
- change package cache lock message (rust-lang/cargo#7029)
- Fix documenting an example. (rust-lang/cargo#7023)
- Fix nonconcurrent tests (rust-lang/cargo#6900)
- Update git2 crates for libgit2 0.28 (rust-lang/cargo#7018)
- fix bunch of clippy warnings (rust-lang/cargo#7019)
- Ignore remap-path-prefix in metadata hash. (rust-lang/cargo#6966)
- Don't synthesize feature diretives for non-optional deps (rust-lang/cargo#7010)
- Handle pipelined tests of libraries (rust-lang/cargo#7008)
- Import the cargo-vendor subcommand into Cargo (rust-lang/cargo#6869)
- Remove unnecessary outlives bounds (rust-lang/cargo#7000)
- Catch filename output collisions in rustdoc. (rust-lang/cargo#6998)
- the testing SAT solver was messed up by a refactor (rust-lang/cargo#6995)
- Add some hints to the docs for `cfg()` targets (rust-lang/cargo#6990)
- Test the Resolver against the varisat Library (rust-lang/cargo#6980)
- Update changelog. (rust-lang/cargo#6984)
- Update cache-messages tracking issue. (rust-lang/cargo#6987)
- zsh: Add --all-targets option to cargo-check and cargo-build (rust-lang/cargo#6985)
- Fix typo (rust-lang/cargo#6982)
bors added a commit to rust-lang/rust that referenced this pull request Jun 18, 2019
Update cargo

Update cargo

19 commits in 545f354259be4e9745ea00a524c0e4c51df01aa6..807429e1b6da4e2ec52488ef2f59e77068c31e1f
2019-05-23 17:45:30 +0000 to 2019-06-11 14:06:10 +0000
- Stabilize publish-lockfile. (rust-lang/cargo#7026)
- change package cache lock message (rust-lang/cargo#7029)
- Fix documenting an example. (rust-lang/cargo#7023)
- Fix nonconcurrent tests (rust-lang/cargo#6900)
- Update git2 crates for libgit2 0.28 (rust-lang/cargo#7018)
- fix bunch of clippy warnings (rust-lang/cargo#7019)
- Ignore remap-path-prefix in metadata hash. (rust-lang/cargo#6966)
- Don't synthesize feature diretives for non-optional deps (rust-lang/cargo#7010)
- Handle pipelined tests of libraries (rust-lang/cargo#7008)
- Import the cargo-vendor subcommand into Cargo (rust-lang/cargo#6869)
- Remove unnecessary outlives bounds (rust-lang/cargo#7000)
- Catch filename output collisions in rustdoc. (rust-lang/cargo#6998)
- the testing SAT solver was messed up by a refactor (rust-lang/cargo#6995)
- Add some hints to the docs for `cfg()` targets (rust-lang/cargo#6990)
- Test the Resolver against the varisat Library (rust-lang/cargo#6980)
- Update changelog. (rust-lang/cargo#6984)
- Update cache-messages tracking issue. (rust-lang/cargo#6987)
- zsh: Add --all-targets option to cargo-check and cargo-build (rust-lang/cargo#6985)
- Fix typo (rust-lang/cargo#6982)
@alexcrichton alexcrichton changed the title Don't synthesize feature diretives for non-optional deps Don't synthesize feature directives for non-optional deps Jul 12, 2019
alexcrichton added a commit to alexcrichton/rust that referenced this pull request Jul 12, 2019
In developing rust-lang#61557 I noticed that there were two parts of our tools
that were rebuilt twice on CI. One was rustfmt fixed in rust-lang#61557, but
another was Cargo. The actual fix for Cargo's double compile was
rust-lang/cargo#7010 and took some time to propagate here. In an effort
to continue to assert that Cargo is itself not compiled twice, I updated
the assertion in rustbuild at the time of working on rust-lang#61557 but couldn't
land it because the fix wouldn't be ready until the next bootstrap.

The next bootstrap is now here, so the fix can now land! This does not
change the behavior of rustbuild but it is intended to catch the
previous iteration of compiling cargo twice. The main update here was to
consider more files than those in `$target/release/deps` but also
consider those in `$target/release`. That's where, for example,
`libcargo.rlib` shows up and it's the file we learn about, and that's
what we want to deduplicate.
Centril added a commit to Centril/rust that referenced this pull request Jul 13, 2019
…e, r=Mark-Simulacrum

rustbuild: Improve assert about building tools once

In developing rust-lang#61557 I noticed that there were two parts of our tools
that were rebuilt twice on CI. One was rustfmt fixed in rust-lang#61557, but
another was Cargo. The actual fix for Cargo's double compile was
rust-lang/cargo#7010 and took some time to propagate here. In an effort
to continue to assert that Cargo is itself not compiled twice, I updated
the assertion in rustbuild at the time of working on rust-lang#61557 but couldn't
land it because the fix wouldn't be ready until the next bootstrap.

The next bootstrap is now here, so the fix can now land! This does not
change the behavior of rustbuild but it is intended to catch the
previous iteration of compiling cargo twice. The main update here was to
consider more files than those in `$target/release/deps` but also
consider those in `$target/release`. That's where, for example,
`libcargo.rlib` shows up and it's the file we learn about, and that's
what we want to deduplicate.
@ehuss ehuss added this to the 1.37.0 milestone Feb 6, 2022
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4 participants