Use rustc's Apple deployment target defaults when available #848
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thomcc
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Sep 2, 2023
| // the ordering of env -> rustc -> old defaults is intentional for performance when using | ||
| // an explicit target | ||
| match os { | ||
| AppleOs::MacOs => env::var("MACOSX_DEPLOYMENT_TARGET") |
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Hm... should we emit rerun-if-changed flags for these env vars in any situation? (Perhaps it would be needed in complex situations with cross-compiling?)
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Originally I opted to avoid that (a prior revision of the branch actually ran it through the caching env paths) for consistency reasons. Only cc would rerun, so an arbitrary number of objects not created by cc in the build tree would have a different deployment target and that seems worse then doing nothing and making people run cargo clean to switch.
I think that if this is desired behavior, rustc or cargo should handle it instead and invalidate the entire build tree at once.
Fix the now-unified default watchOS deployment target
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youknowone
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Sep 11, 2023
thomcc
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Sep 14, 2023
|
Prior to this change, the cc crate just didn't emit any |
GuillaumeGomez
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Nov 21, 2024
…v-var, r=davidtwco 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: - https://github.com/PyO3/maturin/blob/b292ef69349f2a56cb8ab1b59fda0be3d3b9f138/src/build_context.rs#L1199-L1220 - https://github.com/rust-lang/cc-rs/blob/daab9244b03e244c4f2511944870d719c443f61f/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](rust-lang/cc-rs#848), so it would break. That's _probably_ fine though, it was broken in a lot of scenarios anyway, and [got](rust-lang/cc-rs#901) [reverted](rust-lang/cc-rs#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
jhpratt
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Nov 22, 2024
…v-var, r=davidtwco 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: - https://github.com/PyO3/maturin/blob/b292ef69349f2a56cb8ab1b59fda0be3d3b9f138/src/build_context.rs#L1199-L1220 - https://github.com/rust-lang/cc-rs/blob/daab9244b03e244c4f2511944870d719c443f61f/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](rust-lang/cc-rs#848), so it would break. That's _probably_ fine though, it was broken in a lot of scenarios anyway, and [got](rust-lang/cc-rs#901) [reverted](rust-lang/cc-rs#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
jhpratt
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…v-var, r=davidtwco 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: - https://github.com/PyO3/maturin/blob/b292ef69349f2a56cb8ab1b59fda0be3d3b9f138/src/build_context.rs#L1199-L1220 - https://github.com/rust-lang/cc-rs/blob/daab9244b03e244c4f2511944870d719c443f61f/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](rust-lang/cc-rs#848), so it would break. That's _probably_ fine though, it was broken in a lot of scenarios anyway, and [got](rust-lang/cc-rs#901) [reverted](rust-lang/cc-rs#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
matthiaskrgr
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…v-var, r=davidtwco 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: - https://github.com/PyO3/maturin/blob/b292ef69349f2a56cb8ab1b59fda0be3d3b9f138/src/build_context.rs#L1199-L1220 - https://github.com/rust-lang/cc-rs/blob/daab9244b03e244c4f2511944870d719c443f61f/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](rust-lang/cc-rs#848), so it would break. That's _probably_ fine though, it was broken in a lot of scenarios anyway, and [got](rust-lang/cc-rs#901) [reverted](rust-lang/cc-rs#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
rust-timer
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Dec 3, 2024
Rollup merge of rust-lang#133041 - madsmtm:print-deployment-target-env-var, r=davidtwco 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: - https://github.com/PyO3/maturin/blob/b292ef69349f2a56cb8ab1b59fda0be3d3b9f138/src/build_context.rs#L1199-L1220 - https://github.com/rust-lang/cc-rs/blob/daab9244b03e244c4f2511944870d719c443f61f/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](rust-lang/cc-rs#848), so it would break. That's _probably_ fine though, it was broken in a lot of scenarios anyway, and [got](rust-lang/cc-rs#901) [reverted](rust-lang/cc-rs#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
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To follow on rust-lang/rust#105354 being released in 1.71, and soon rust-lang/rust#104385, the changeset here aims to make Apple deployment targets more consistent and support future minimum bumps better. To do so, the root change is to try asking
rustcfor what it thinks the default deployment target version is before using a hardcoded one afterccchecks the environment directly for an overridden version. For any users who aren't on 1.71+, everything will work exactly the same.While in the area, duplication of checking the iOS and watchOS default deployment target elsewhere in the library was removed and a bad watchOS version (2.0 -> 5.0) was corrected.
Also, this branch forks from #708 and has a rebased version of its one commit. If only GitHub supported stacked PRs... Due to that though, its better to review this per commit.