Update Generic Unix linker selection #1545
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apple/llvm-project#8214 |
compnerd
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@swift-ci please test Windows platform |
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Not all generic-"unix" environments have the Gold linker available to them, and in some cases, the vendor of the toolchain may provide their own linker. In these cases, the driver should be internally consistent with the toolchain that it is shipped with. Now that we have the clang-linker, we can lean on the linker selection in the clang-linker to determine a default linker. If the clang-linker, and thus, the swift compiler driver, are part of a specific toolchain, that clang-linker should be built for that platform with the appropriate linker defaults set. If someone overrides the linker with `-use-ld`, we should still honour that, but should otherwise be consistent with the appropriate toolchain linker. Fixes: rdar://123061492
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Not all generic-"unix" environments have the Gold linker available to them, and in some cases, the vendor of the toolchain may provide their own linker. In these cases, the driver should be internally consistent with the toolchain that it is shipped with.
Now that we have the clang-linker, we can lean on the linker selection in the clang-linker to determine a default linker. If the clang-linker, and thus, the swift compiler driver, are part of a specific toolchain, that clang-linker should be built for that platform with the appropriate linker defaults set. If someone overrides the linker with
-use-ld, we should still honour that, but should otherwise be consistent with the appropriate toolchain linker.This will enable building and linking on AmazonLinux 2023 without requiring folks to always pass additional flags. It also means we can produce a self-contained toolchain that is internally consistent using
lldas the linker.LLD removes the start/stop symbols as of https://reviews.llvm.org/D96914, which the Swift runtime used to register the runtime type metadata and other runtime metadata tables. I'm waiting to merge this until apple/swift#72061 merges as we won't know when to pass
nostart-stop-gcwith this change.Fixes: rdar://123061492