[cfe-dev] Multiple-defined __destructor_1, __destructor_8 when building with recent clang-cl

[John McCall via cfe-dev]

> On Apr 4, 2018, at 3:07 PM, Reid Kleckner via cfe-dev <cfe-dev at lists.llvm.org> wrote:
> 
> Looks like Akira added a bunch of stuff for this in r326307. It is supposed to relate to ARC and __strong, __weak, etc. It's pretty complex. :(
> 
> That code does not appear to work for non-MachO. It creates LLVM IR functions directly without going through the usual CGM codepaths, so it doesn't add a comdat.

I would not have expected this patch to affect the compilation of ordinary C++ code.

John.

> 
> On Wed, Apr 4, 2018 at 1:32 AM Stephan Bergmann via cfe-dev <cfe-dev at lists.llvm.org <mailto:cfe-dev at lists.llvm.org>> wrote:
> After a recent pull of LLVM/Clang trunk, my clang-cl build of
> LibreOffice on Windows started to fail to link some DLL because of
> __destructor_1 and __destructor_8 symbols defined in multiple objects.
> 
> I haven't been able yet to strip that down, and looking at the objects'
> assembler output it isn't clear to me what those symbols are emitted for.
> 
> Do those symbols maybe ring a bell for anybody?  Is that some recent
> addition?
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