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add enable-warnings flag for llvm, and disable it by default. #108991

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Merged
merged 1 commit into from
Mar 15, 2023
Merged

add enable-warnings flag for llvm, and disable it by default. #108991

merged 1 commit into from
Mar 15, 2023

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@onur-ozkan
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This flag allows to turn off warnings of llvm compilation for people who are not interested on those warnings.

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rustbot commented Mar 10, 2023

r? @albertlarsan68

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@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) labels Mar 10, 2023
onur-ozkan
onur-ozkan commented Mar 10, 2023
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onur-ozkan commented Mar 10, 2023
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src/bootstrap/native.rs Outdated
Comment on lines -493 to -490
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see https://rust-lang.zulipchat.com/#narrow/stream/187780-t-compiler.2Fwg-llvm/topic/extending-llvm-variables

@onur-ozkan onur-ozkan changed the title add enable-warnings flag for llvm add enable-warnings flag for llvm and update llvm defaults of config.user.toml Mar 10, 2023
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I think you might be interested looking 2nd commit of this PR @jyn514

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@onur-ozkan onur-ozkan changed the title add enable-warnings flag for llvm and update llvm defaults of config.user.toml add enable-warnings flag for llvm Mar 10, 2023
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I think the codegen profile, and at least some parts of CI will want this flag enabled.
cc @rust-lang/infra Do you have an opinion about this flag in CI?

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I think the codegen profile, and at least some parts of CI will want this flag enabled. cc @rust-lang/infra Do you have an opinion about this flag in CI?

Agree for codegen, but I am not sure about that CI checking warnings

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rustbot commented Mar 10, 2023

This PR changes src/bootstrap/defaults/config.codegen.toml. If appropriate, please also update config.compiler.toml so the defaults are in sync.

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klensy commented Mar 10, 2023

I'm misreading, or it should be allows to turn *on* warnings, because it will be off by default?

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I'm misreading, or it should be allows to turn *on* warnings, because it will be off by default?

Currently, it's always on. With this PR, we are able to turn it off. The explanation doesn't target the default value or how the flag works. It explains what this PR brings.

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bors commented Mar 13, 2023

☔ The latest upstream changes (presumably #109056) made this pull request unmergeable. Please resolve the merge conflicts.

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Can you add an entry to the changelog please (it is located in src/bootstrap/CHANGELOG.md IIRC).
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@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Mar 15, 2023
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@rustbot ready

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Mar 15, 2023
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Thanks for the PR!
@bors rollup
r=me once CI green

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@bors r+

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bors commented Mar 15, 2023

📌 Commit 2e7249f has been approved by albertlarsan68

It is now in the queue for this repository.

@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 Mar 15, 2023
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klensy commented Mar 15, 2023 •
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I'm misreading, or it should be allows to turn *on* warnings, because it will be off by default?

Currently, it's always on. With this PR, we are able to turn it off. The explanation doesn't target the default value or how the flag works. It explains what this PR brings.

Currently, it's always on.

And now it will be default off, or I'm wrong (maybe i read bootstrap code wrong)?

config.llvm_enable_warnings = llvm.enable_warnings.unwrap_or(false);

Oh,

Add llvm option `enable-warnings` to have control on llvm compilation warnings. Default to false.

so it is changes defaults.

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The warnings will be off by default, except when using the codegen profile, because then warnings can be useful.

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klensy commented Mar 15, 2023

The warnings will be off by default, except when using the codegen profile, because then warnings can be useful.

Yes, but title says only about adding ability to switch warning, not changing it's current behavior (see my first message).

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The title is not the source of truth.
See the changelog and documentation for the option to get the true meaning and things changed.
That said, I will change the title, to avoid future confusion.

@albertlarsan68 albertlarsan68 changed the title add enable-warnings flag for llvm add enable-warnings flag for llvm, and enable it by default. Mar 15, 2023
@albertlarsan68 albertlarsan68 changed the title add enable-warnings flag for llvm, and enable it by default. add enable-warnings flag for llvm, and disable it by default. Mar 15, 2023
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The warnings will be off by default, except when using the codegen profile, because then warnings can be useful.

Yes, but title says only about adding ability to switch warning, not changing it's current behavior (see my first message).

You can't change the behaviour of llvm compilation warnings without the changes this PR provides. PR doesn't just turn off warnings automatically. It gives the ability of switching llvm compilation warnings on and off.

@Dylan-DPC Dylan-DPC mentioned this pull request Mar 15, 2023
Merged
bors added a commit to rust-lang-ci/rust that referenced this pull request Mar 15, 2023
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Auto merge of rust-lang#109164 - Dylan-DPC:rollup-0bwxwos, r=Dylan-DPC
a167cbd 
Rollup of 7 pull requests

Successful merges:

 - rust-lang#108991 (add `enable-warnings` flag for llvm, and disable it by default.)
 - rust-lang#109109 (Use `unused_generic_params` from crate metadata)
 - rust-lang#109111 (Create dirs for build_triple)
 - rust-lang#109136 (Simplify proc macro signature validity check)
 - rust-lang#109150 (Update cargo)
 - rust-lang#109154 (Fix MappingToUnit  to support no span of arg_ty)
 - rust-lang#109157 (Remove mw from review rotation for a while)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit c11399b into rust-lang:master Mar 15, 2023
@rustbot rustbot added this to the 1.70.0 milestone Mar 15, 2023
@onur-ozkan onur-ozkan deleted the new-llvm-flag branch March 15, 2023 18:31
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