DMARC-Filter: OpenDMARC Filter v1.4.2 delorie.com 60I8i2uM3496522
DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 101F94BA2E2D
Date: Sun, 18 Jan 2026 17:43:36 +0900
To: cygwin@cygwin.com
Subject: Re: Request to update libc++ related packages for current
 Clang/LLVM toolchain
Message-Id: <20260118174336.864203d6899f28f2222066c2@nifty.ne.jp>
In-Reply-To: <9f2f11dc-9753-465a-b3e4-3d2bac5c4007@SystematicSW.ab.ca>
References: <20260115215321.2bc9368897b5b60557bd2485@nifty.ne.jp>
 <1768690885668.2039852652.2136123419@gmail.com>
 <20260118164544.346bdad89e67eec6fd054d95@nifty.ne.jp>
 <9f2f11dc-9753-465a-b3e4-3d2bac5c4007@SystematicSW.ab.ca>
Mime-Version: 1.0
Precedence: list
From: Takashi Yano via Cygwin <cygwin@cygwin.com>
Reply-To: Takashi Yano <takashi.yano@nifty.ne.jp>
Content-Type: text/plain; charset="iso-2022-jp"
Content-Transfer-Encoding: 7bit
Errors-To: cygwin-bounces~archive-cygwin=delorie.com@cygwin.com
Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie.com@cygwin.com>

On Sun, 18 Jan 2026 01:22:32 -0700
Brian Inglis wrote:
> On 2026-01-18 00:45, Takashi Yano via Cygwin wrote:
> > On Sun, 18 Jan 2026 00:35:37 +0000, kikairoya via Cygwin wrote:
> >> 2026年1月15日 21:53:21 (+09:00) で、Takashi Yano via Cygwin さんが書きました:
> >>> 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?
> 
> Is there a reason why llvm/clang/compiler-rt can not use Cygwin TLS and must use 
> Emulated TLS?

I think so. gcc also uses its own emutls.

> Should this discussion be moved to -developers as that level of knowledge seems 
> to be required?

Maybe.

-- 
Takashi Yano <takashi.yano@nifty.ne.jp>

-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple