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Rollup merge of rust-lang#131037 - madsmtm:move-llvm-target-versioning, r=petrochenkov Move versioned Apple LLVM targets from `rustc_target` to `rustc_codegen_ssa` Fully specified LLVM targets contain the OS version on macOS/iOS/tvOS/watchOS/visionOS, and this version depends on the deployment target environment variables like `MACOSX_DEPLOYMENT_TARGET`, `IPHONEOS_DEPLOYMENT_TARGET` etc. We would like to move this to later in the compilation pipeline, both because it feels impure to access environment variables when fetching target information, but mostly because we need access to more information from rust-lang#130883 to do rust-lang#118204. See also rust-lang#129342 (comment) for some discussion. The first and second commit does the actual refactor, it should be a non-functional change, the third commit adds diagnostics for invalid deployment targets, which are now possible to do because we have access to the session. Tested with the same commands as in rust-lang#130435. r? ``````@petrochenkov``````
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,171 @@ | ||
| use std::env; | ||
| use std::fmt::{Display, from_fn}; | ||
| use std::num::ParseIntError; | ||
|
|
||
| use rustc_session::Session; | ||
| use rustc_target::spec::Target; | ||
|
|
||
| use crate::errors::AppleDeploymentTarget; | ||
|
|
||
| #[cfg(test)] | ||
| mod tests; | ||
|
|
||
| pub(super) fn macho_platform(target: &Target) -> u32 { | ||
| match (&*target.os, &*target.abi) { | ||
| ("macos", _) => object::macho::PLATFORM_MACOS, | ||
| ("ios", "macabi") => object::macho::PLATFORM_MACCATALYST, | ||
| ("ios", "sim") => object::macho::PLATFORM_IOSSIMULATOR, | ||
| ("ios", _) => object::macho::PLATFORM_IOS, | ||
| ("watchos", "sim") => object::macho::PLATFORM_WATCHOSSIMULATOR, | ||
| ("watchos", _) => object::macho::PLATFORM_WATCHOS, | ||
| ("tvos", "sim") => object::macho::PLATFORM_TVOSSIMULATOR, | ||
| ("tvos", _) => object::macho::PLATFORM_TVOS, | ||
| ("visionos", "sim") => object::macho::PLATFORM_XROSSIMULATOR, | ||
| ("visionos", _) => object::macho::PLATFORM_XROS, | ||
| _ => unreachable!("tried to get Mach-O platform for non-Apple target"), | ||
| } | ||
| } | ||
|
|
||
| /// Deployment target or SDK version. | ||
| /// | ||
| /// The size of the numbers in here are limited by Mach-O's `LC_BUILD_VERSION`. | ||
| type OSVersion = (u16, u8, u8); | ||
|
|
||
| /// Parse an OS version triple (SDK version or deployment target). | ||
| fn parse_version(version: &str) -> Result<OSVersion, ParseIntError> { | ||
| if let Some((major, minor)) = version.split_once('.') { | ||
| let major = major.parse()?; | ||
| if let Some((minor, patch)) = minor.split_once('.') { | ||
| Ok((major, minor.parse()?, patch.parse()?)) | ||
| } else { | ||
| Ok((major, minor.parse()?, 0)) | ||
| } | ||
| } else { | ||
| Ok((version.parse()?, 0, 0)) | ||
| } | ||
| } | ||
|
|
||
| pub fn pretty_version(version: OSVersion) -> impl Display { | ||
| let (major, minor, patch) = version; | ||
| from_fn(move |f| { | ||
| write!(f, "{major}.{minor}")?; | ||
| if patch != 0 { | ||
| write!(f, ".{patch}")?; | ||
| } | ||
| Ok(()) | ||
| }) | ||
| } | ||
|
|
||
| /// Minimum operating system versions currently supported by `rustc`. | ||
| fn os_minimum_deployment_target(os: &str) -> OSVersion { | ||
| // When bumping a version in here, remember to update the platform-support docs too. | ||
| // | ||
| // NOTE: The defaults may change in future `rustc` versions, so if you are looking for the | ||
| // default deployment target, prefer: | ||
| // ``` | ||
| // $ rustc --print deployment-target | ||
| // ``` | ||
| match os { | ||
| "macos" => (10, 12, 0), | ||
| "ios" => (10, 0, 0), | ||
| "tvos" => (10, 0, 0), | ||
| "watchos" => (5, 0, 0), | ||
| "visionos" => (1, 0, 0), | ||
| _ => unreachable!("tried to get deployment target for non-Apple platform"), | ||
| } | ||
| } | ||
|
|
||
| /// The deployment target for the given target. | ||
| /// | ||
| /// This is similar to `os_minimum_deployment_target`, except that on certain targets it makes sense | ||
| /// to raise the minimum OS version. | ||
| /// | ||
| /// This matches what LLVM does, see in part: | ||
| /// <https://github.com/llvm/llvm-project/blob/llvmorg-18.1.8/llvm/lib/TargetParser/Triple.cpp#L1900-L1932> | ||
| fn minimum_deployment_target(target: &Target) -> OSVersion { | ||
| match (&*target.os, &*target.arch, &*target.abi) { | ||
| ("macos", "aarch64", _) => (11, 0, 0), | ||
| ("ios", "aarch64", "macabi") => (14, 0, 0), | ||
| ("ios", "aarch64", "sim") => (14, 0, 0), | ||
| ("ios", _, _) if target.llvm_target.starts_with("arm64e") => (14, 0, 0), | ||
| // Mac Catalyst defaults to 13.1 in Clang. | ||
| ("ios", _, "macabi") => (13, 1, 0), | ||
| ("tvos", "aarch64", "sim") => (14, 0, 0), | ||
| ("watchos", "aarch64", "sim") => (7, 0, 0), | ||
| (os, _, _) => os_minimum_deployment_target(os), | ||
| } | ||
| } | ||
|
|
||
| /// Name of the environment variable used to fetch the deployment target on the given OS. | ||
| fn deployment_target_env_var(os: &str) -> &'static str { | ||
| match os { | ||
| "macos" => "MACOSX_DEPLOYMENT_TARGET", | ||
| "ios" => "IPHONEOS_DEPLOYMENT_TARGET", | ||
| "watchos" => "WATCHOS_DEPLOYMENT_TARGET", | ||
| "tvos" => "TVOS_DEPLOYMENT_TARGET", | ||
| "visionos" => "XROS_DEPLOYMENT_TARGET", | ||
| _ => unreachable!("tried to get deployment target env var for non-Apple platform"), | ||
| } | ||
| } | ||
|
|
||
| /// Get the deployment target based on the standard environment variables, or fall back to the | ||
| /// minimum version supported by `rustc`. | ||
| pub fn deployment_target(sess: &Session) -> OSVersion { | ||
| let min = minimum_deployment_target(&sess.target); | ||
| let env_var = deployment_target_env_var(&sess.target.os); | ||
|
|
||
| if let Ok(deployment_target) = env::var(env_var) { | ||
| match parse_version(&deployment_target) { | ||
| Ok(version) => { | ||
| let os_min = os_minimum_deployment_target(&sess.target.os); | ||
| // It is common that the deployment target is set a bit too low, for example on | ||
| // macOS Aarch64 to also target older x86_64. So we only want to warn when variable | ||
| // is lower than the minimum OS supported by rustc, not when the variable is lower | ||
| // than the minimum for a specific target. | ||
| if version < os_min { | ||
| sess.dcx().emit_warn(AppleDeploymentTarget::TooLow { | ||
| env_var, | ||
| version: pretty_version(version).to_string(), | ||
| os_min: pretty_version(os_min).to_string(), | ||
| }); | ||
| } | ||
|
|
||
| // Raise the deployment target to the minimum supported. | ||
| version.max(min) | ||
| } | ||
| Err(error) => { | ||
| sess.dcx().emit_err(AppleDeploymentTarget::Invalid { env_var, error }); | ||
| min | ||
| } | ||
| } | ||
| } else { | ||
| // If no deployment target variable is set, default to the minimum found above. | ||
| min | ||
| } | ||
| } | ||
|
|
||
| pub(super) fn add_version_to_llvm_target( | ||
| llvm_target: &str, | ||
| deployment_target: OSVersion, | ||
| ) -> String { | ||
| let mut components = llvm_target.split("-"); | ||
| let arch = components.next().expect("apple target should have arch"); | ||
| let vendor = components.next().expect("apple target should have vendor"); | ||
| let os = components.next().expect("apple target should have os"); | ||
| let environment = components.next(); | ||
| assert_eq!(components.next(), None, "too many LLVM triple components"); | ||
|
|
||
| let (major, minor, patch) = deployment_target; | ||
|
|
||
| assert!( | ||
| !os.contains(|c: char| c.is_ascii_digit()), | ||
| "LLVM target must not already be versioned" | ||
| ); | ||
|
|
||
| if let Some(env) = environment { | ||
| // Insert version into OS, before environment | ||
| format!("{arch}-{vendor}-{os}{major}.{minor}.{patch}-{env}") | ||
| } else { | ||
| format!("{arch}-{vendor}-{os}{major}.{minor}.{patch}") | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| use super::{add_version_to_llvm_target, parse_version}; | ||
|
|
||
| #[test] | ||
| fn test_add_version_to_llvm_target() { | ||
| assert_eq!( | ||
| add_version_to_llvm_target("aarch64-apple-macosx", (10, 14, 1)), | ||
| "aarch64-apple-macosx10.14.1" | ||
| ); | ||
| assert_eq!( | ||
| add_version_to_llvm_target("aarch64-apple-ios-simulator", (16, 1, 0)), | ||
| "aarch64-apple-ios16.1.0-simulator" | ||
| ); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_parse_version() { | ||
| assert_eq!(parse_version("10"), Ok((10, 0, 0))); | ||
| assert_eq!(parse_version("10.12"), Ok((10, 12, 0))); | ||
| assert_eq!(parse_version("10.12.6"), Ok((10, 12, 6))); | ||
| assert_eq!(parse_version("9999.99.99"), Ok((9999, 99, 99))); | ||
| } |
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