rnk added inline comments.
================
Comment at: clang/lib/CodeGen/ItaniumCXXABI.cpp:2519-2520
return VarLinkage;
+ // On Windows, WeakODR is a no-op, boiling down to the same as normal
external
+ // linkage.
+ if (CGM.getTriple().isOSWindows())
----------------
mstorsjo wrote:
> rnk wrote:
> > I would say that this is inaccurate. It greatly affects what the optimizer
> > is allowed to do.
> >
> > It looks like we forgot to put a comdat on these things, is that not the
> > correct fix?
> Oh, ok.
>
> The full case I was trying to fix (but forgot to recheck after changing this
> bit) is that when used with `-ffunction-sections`, the tls wrapper function
> ends up as comdat `one_only`, which then gives multiple definition errors. So
> perhaps the issue is in the handling of `-ffunction-sections` wrt weak_odr?
Ah, that is an interesting wrinkle. I'm surprised that things worked without
-ffunction-sections, though. I would've expected the two plain external
definitions to produce multiple definition errors.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D71572/new/
https://reviews.llvm.org/D71572
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