Latest master toolchains are broken when linking LLVM: "__morestack: invalid needed version 2" #81554
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The error is actually already mentioned in #81489. However, I am building Miri with cargo, so I don't know how I'd "use LLD instead". |
RalfJung
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Mark-Simulacrum
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A-LLVM
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Yes, a revert seems appropriate. We're going to have to figure out where that's actually coming from. The only change I saw between 10 and 11 by grepping |
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Yeah, I thought this issue would be limited to the rustc build, but it makes sense that it can also affect project linking against rustc shared objects. I've looked a bit into what the root cause is, and what I have so far as that the symbol comes from https://github.com/llvm/llvm-project/blob/b10d445307a0f3c7e5522836b4331090aacaf349/llvm/lib/ExecutionEngine/RuntimeDyld/RTDyldMemoryManager.cpp#L217 and is present as a weak symbol both when compiling with clang-10 and clang-11. The only difference I see from So apparently Edit: |
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@nikic can you prepare a revert PR? |
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The issue is probably going to be in how exactly the objects that comprise libLLVM.so are compiled, not linked. I suspect Alas, reasons these obscure failures can occur are many – I've seen them occur from things as trivial as forgetting to The question is: is there perhaps a way to disable ExecutionEngine entirely? Intuitively nothing we do should depend on that code. And if not, I'm comfortable patching out |
We normally don't link ExecutionEngine, but dist-x86_64-linux in particular builds LLVM with ThinLTO, in which case we link libLLVM.so as shared, instead of statically linking individual components into rustc_llvm. |
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It seems to be possible to configure the components in libLLVM.so using |
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So, I think we could have used |
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Looks like I'm getting this locally when trying to bootstrap rustc (while building Backtrace
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@matthiaskrgr which commit are you trying to build? |
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Probably best to open a new issue then; this one has been closed and the steps to reproduce it still work without error -- you might be having a different problem. |
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Opened #82839 |
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Did anyone file an upstream bug report about this? I'm observing it outside of Rust, but with a similar setup (libLLVM.so with lld+ThinLTO, then linking it into a binary with ld.bfd). If not, I'd try to build a reproducer. |
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I've opened bug 49915 for this. |
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The bug has been fixed, the fix will be in LLVM 12.0.1. |
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Thanks! We can try updating clang again once the 12.0.1 tag is there. |
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When I install the latest master toolchains via
rustup-toolchain-install-masterand try to build Miri with them, linking fails:I did some bisection, and it looks like the problem started happening with #81489.
Cc @rust-lang/infra
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