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authorbors <bors@rust-lang.org>2023-12-10 21:48:53 +0000
committerbors <bors@rust-lang.org>2023-12-10 21:48:53 +0000
commitd86d65bbc19b928387f68427fcc3a0da498d8a19 (patch)
tree4cb4a17ba1d40e64b5a126b044742176c49eace9 /compiler/rustc_mir_transform/src
parentec4176167b964debee77015d0c67720639f9d673 (diff)
parentdc2f77aad617400b68ba607ca59bbf0121000b1f (diff)
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Auto merge of #118368 - GuillaumeGomez:env-flag, r=Nilstrieb
Implement `--env` compiler flag (without `tracked_env` support)

Part of https://github.com/rust-lang/rust/issues/80792.
Implementation of https://github.com/rust-lang/compiler-team/issues/653.
Not an implementation of https://github.com/rust-lang/rfcs/pull/2794.

It adds the `--env` compiler flag option which allows to set environment values used by `env!` and `option_env!`.

Important to note: When trying to retrieve an environment variable value, it will first look into the ones defined with `--env`, and if there isn't one, then only it will look into the environment variables. So if you use `--env PATH=a`, then `env!("PATH")` will return `"a"` and not the actual `PATH` value.

As mentioned in the title, `tracked_env` support is not added here. I'll do it in a follow-up PR.

r? rust-lang/compiler
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