Get gcc-ld=lld working on macos #86945
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Oh interesting, ok so with rust-minidump it's blowing up in build scripts, but it seems to build thin-vec (something with no dependencies or build scripts) fine! |
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(I do not have a readily available linux env to test if this failure mode is uniquely macos or just the usual "build-scripts and plugins have weird interactions with compiler flags" problem) |
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Using build logfailing cc invocation broken up into lines |
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Maybe your lld is too old? I can build my workspace with: |
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There is one binary lld and various symbolic links with different names. You have to pass |
Dylan-DPC-zz
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Aug 26, 2021
Make `-Z gcc-ld=lld` work for Apple targets `-Z gcc-ld=lld` was introduced in rust-lang#85961. It does not work on Macos because lld needs be either named `ld64` or passed `-flavor darwin` as the first two arguments in order to select the Mach-O flavor. Rust invokes cc (=clang) on Macos for linking which calls `ld` as linker binary and not `ld64`, so just creating an `ld64` binary and modifying the search path with `-B` does not work. In order to solve this patch does: * Set the `lld_flavor` for all Apple-derived targets to `LldFlavor::Ld64`. As far as I can see this actually works towards fixing `-Xlinker=rust-lld` as all those targets use the Mach-O object format. * Copy/hardlink rust-lld to the gcc-ld subdirectory as ld64 next to ld. * If `-Z gcc-ld=lld` is used and the target lld flavor is Ld64 add `-fuse-ld=/path/to/ld64` to the linker invocation. Fixes rust-lang#86945.
Manishearth
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Aug 27, 2021
Make `-Z gcc-ld=lld` work for Apple targets `-Z gcc-ld=lld` was introduced in rust-lang#85961. It does not work on Macos because lld needs be either named `ld64` or passed `-flavor darwin` as the first two arguments in order to select the Mach-O flavor. Rust invokes cc (=clang) on Macos for linking which calls `ld` as linker binary and not `ld64`, so just creating an `ld64` binary and modifying the search path with `-B` does not work. In order to solve this patch does: * Set the `lld_flavor` for all Apple-derived targets to `LldFlavor::Ld64`. As far as I can see this actually works towards fixing `-Xlinker=rust-lld` as all those targets use the Mach-O object format. * Copy/hardlink rust-lld to the gcc-ld subdirectory as ld64 next to ld. * If `-Z gcc-ld=lld` is used and the target lld flavor is Ld64 add `-fuse-ld=/path/to/ld64` to the linker invocation. Fixes rust-lang#86945.
Dylan-DPC-zz
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Aug 27, 2021
Make `-Z gcc-ld=lld` work for Apple targets `-Z gcc-ld=lld` was introduced in rust-lang#85961. It does not work on Macos because lld needs be either named `ld64` or passed `-flavor darwin` as the first two arguments in order to select the Mach-O flavor. Rust invokes cc (=clang) on Macos for linking which calls `ld` as linker binary and not `ld64`, so just creating an `ld64` binary and modifying the search path with `-B` does not work. In order to solve this patch does: * Set the `lld_flavor` for all Apple-derived targets to `LldFlavor::Ld64`. As far as I can see this actually works towards fixing `-Xlinker=rust-lld` as all those targets use the Mach-O object format. * Copy/hardlink rust-lld to the gcc-ld subdirectory as ld64 next to ld. * If `-Z gcc-ld=lld` is used and the target lld flavor is Ld64 add `-fuse-ld=/path/to/ld64` to the linker invocation. Fixes rust-lang#86945.
Dylan-DPC-zz
pushed a commit
to Dylan-DPC-zz/rust
that referenced
this issue
Aug 27, 2021
Make `-Z gcc-ld=lld` work for Apple targets `-Z gcc-ld=lld` was introduced in rust-lang#85961. It does not work on Macos because lld needs be either named `ld64` or passed `-flavor darwin` as the first two arguments in order to select the Mach-O flavor. Rust invokes cc (=clang) on Macos for linking which calls `ld` as linker binary and not `ld64`, so just creating an `ld64` binary and modifying the search path with `-B` does not work. In order to solve this patch does: * Set the `lld_flavor` for all Apple-derived targets to `LldFlavor::Ld64`. As far as I can see this actually works towards fixing `-Xlinker=rust-lld` as all those targets use the Mach-O object format. * Copy/hardlink rust-lld to the gcc-ld subdirectory as ld64 next to ld. * If `-Z gcc-ld=lld` is used and the target lld flavor is Ld64 add `-fuse-ld=/path/to/ld64` to the linker invocation. Fixes rust-lang#86945.
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#71515 has progressed to the point where there is now a
-Z gcc-ld=lldflag for linux builds. On a lark, I tested what happens on macos. Surprisingly, it wasn't immediately rejected. Unsurprisingly, it exploded. I'm not 100% sure if macos and linux are similar enough environments that the same mechanism should just work, but I think it should?build log
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