[llvm-dev] LLD doesn't handle globals with appending linkage (original) (raw)

Gleb Popov via llvm-dev llvm-dev at lists.llvm.org
Tue Feb 18 10:21:09 PST 2020

On Tue, Feb 18, 2020 at 10:19 PM Fangrui Song via llvm-dev < llvm-dev at lists.llvm.org> wrote:

On 2020-02-18, Gleb Popov via llvm-dev wrote: >On Tue, Feb 18, 2020 at 9:42 PM David Blaikie <dblaikie at gmail.com> wrote: > >> I'm /guessing/ this might be related to the COFF support specifically >> (perhaps COFF has no appending linkage support - in some cases LLVM IR >> supports the union of all semantics so that different formats can be fully >> expressed - but it means when targeting certain formats, some features are >> inherently unusable because they don't map to anything on that platform) >> > >Actually, I experience the same problem with ELF on FreeBSD. https://llvm.org/docs/LangRef.html > Unfortunately this doesn’t correspond to any feature in .o files, so > it can only be used for variables like llvm.globalctors which llvm > interprets specially. I think appending can only be used by llvm.used llvm.compiler.used llvm.globalctors llvm.globaldtors. How did you end up with an appending in the IR? (Maybe we can add an verifier because it seems no object format supports it.)

But these bitcode files aren't linked to .o files yet, but into a single bitcode file. It should be perfectly fine to have appending globals at this stage.

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