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Print name of env var in `--print=deployment-target` The deployment target environment variable is OS-specific, and if you're in a place where you're asking `rustc` for the deployment target, you're likely to also wanna know the name of the environment variable. I myself wanted this for some code I'm working on in bootstrap, for example. Behaviour before this PR: ```console $ rustc --print=deployment-target --target=aarch64-apple-darwin deployment_target=11.0 $ rustc --print=deployment-target --target=aarch64-apple-visionos deployment_target=1.0 ``` Behaviour after this PR: ```console $ rustc --print=deployment-target --target=aarch64-apple-darwin MACOSX_DEPLOYMENT_TARGET=11.0 $ rustc --print=deployment-target --target=aarch64-apple-visionos XROS_DEPLOYMENT_TARGET=1.0 ``` My _belief_ is that this option is extremely rarely used in general, and a GitHub search for "rustc print deployment-target" seems to confirm this, it revealed only the following actual pieces of code using this: -b292ef6934/src/build_context.rs (L1199-L1220)-daab9244b0/src/lib.rs (L3422-L3426)`maturin` does `.split('=').last()`, so it will continue to work after this change, but `cc v1.0.84` did `.strip_prefix("deployment_target=")` since [this PR](https://github.com/rust-lang/cc-rs/pull/848), so it would break. That's _probably_ fine though, it was broken in a lot of scenarios anyway, and [got](https://github.com/rust-lang/cc-rs/pull/901) [reverted](https://github.com/rust-lang/cc-rs/pull/943) in `v1.0.85`. So while this is _technically_ a breaking change, I really doubt that anyone is going to observe it, so it's probably fine. ``@BlackHoleFox`` wdyt? ``@rustbot`` label O-apple r? compiler
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.