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Fix `SDKROOT` ignore on macOS `rustc` has code to detect when `SDKROOT` is obviously set for the wrong platform, so that it can choose to ignore it. This is a pretty important feature for Cargo build scripts and proc macros, since you will often have `SDKROOT` set to an iOS platform there. However, the code was checking for an old SDK version name `"macosx10.15"` that was previously configured by `add_apple_sdk`, but nowadays configured to the correct `"macosx"`. I think this error was introduced in part https://github.com/rust-lang/rust/pull/77202 and in https://github.com/rust-lang/rust/pull/100286. Fixes part of https://github.com/rust-lang/rust/issues/80817 (linking with `-Clinker=ld` now works), though more work is still needed in this area, see also https://github.com/rust-lang/rust/issues/129432. ``@rustbot`` label O-macos A-cross