Don't use the value of SDKROOT if it doesn't match the target. #1047
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The SDKROOT environment variable can be problematic on Mac. In cases where you are compiling for multiple targets, SDKROOT cannot be right for all of them. Furthermore, the system Python interpreter sets SDKROOT to the MacOSX SDK if not already set. So, if you are using a Python script to run a build, and you need to build for multiple targets, the logic in the cc crate doesn't work. This is precisely what is happening with rustc itself, and so we can't upgrade the version of the cc crate used by the bootstrap code. (Unsetting SDKROOT doesn't work either because the custom clang build that rustc uses for CI depends on it being set)
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For more information, see rust-lang/rust#122504 and rust-lang/rust#124565 |
NobodyXu
requested changes
May 2, 2024
madsmtm
approved these changes
May 5, 2024
NobodyXu
reviewed
May 6, 2024
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The SDKROOT environment variable can be problematic on Mac. In cases where you are compiling for multiple targets, SDKROOT cannot be right for all of them. Furthermore, the system Python interpreter sets SDKROOT to the MacOSX SDK if not already set.
So, if you are using a Python script to run a build, and you need to build for multiple targets, the logic in the cc crate doesn't work. This is precisely what is happening with rustc itself, and so we can't upgrade the version of the cc crate used by the bootstrap code.
(Unsetting SDKROOT doesn't work either because the custom clang build that rustc uses for CI depends on it being set)