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Date:	Sun, 18 Jan 2026 16:45:44 +0900
To:	cygwin AT cygwin DOT com
Subject:	Re: Request to update libc++ related packages for current
	Clang/LLVM toolchain
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From:	Takashi Yano via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
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On Sun, 18 Jan 2026 00:35:37 +0000
kikairoya via Cygwin <cygwin AT cygwin DOT com> wrote:

> 2026$BG/(B1$B7n(B15$BF|(B 21:53:21 (+09:00) $B$G!"(BTakashi Yano via Cygwin $B$5$s$,=q$-$^$7$?(B:
> > The resulted a.exe will be free from libgcc_s. Please try.
> >
> 
> 
> Using compiler-rt instead of libgcc_s requires extra attention in Cygwin,
> because the emulated TLS functionality implemented in compiler-rt can't
> share the storage across DLL boundaries.

Thanks for pointing this out.

The comment in the emutls.c explains that.
https://github.com/llvm/llvm-project/blob/main/compiler-rt/lib/builtins/emutls.c#L378-L389

Do you think this is a defect we should accept?

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

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