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Date: Thu, 15 Jan 2026 21:53:21 +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, 11 Jan 2026 23:11:00 +0200
Florin wrote:
> Hello Cygwin list,
> 
> I’ve noticed that the Clang/LLVM stable packages in Cygwin are at version
> 20.1.x, while the libc++-devel, libc++1, libc++abi-devel, libc++abi1,
> libunwind-devel and libunwind1 packages are still at 8.0.1. According to
> the package summaries, they were last updated in 2019.
> 
> This version mismatch can present issues using modern C++ features and
> makes it hard to use a complete LLVM toolchain with libc++ on Cygwin.
> 
> I searched the Cygwin mailing list archives for prior posts about updating
> libc++, but I didn’t find a clear request or discussion about coordinating
> libc++ versions with newer Clang.
> 
> Could you clarify if there is a plan to update libc++ to match more recent
> LLVM releases, or if the recommended C++ standard library for newer and
> future Clang versions on Cygwin should be libstdc++.
> 
> Thank you for your time and I'm grateful for the effort you all put into
> this project.

I have just uploaded libcxx, compiler-rt, and libunwind packages.
However, you cannot use them with -stdlib=libc++, -rtlib=compiler-rt,
and -unwindlib=libunwind. This is because clang package has incomplete
cygwin driver.

You can link them to, for example hello.cc, with:
clang++ -stdlib=libc++ -isystem /usr/include/c++/v1 hello.cc -lc++ $(clang --print-resource-dir)/lib/cygwin/libclang_rt.builtins-x86_64.a -lunwind

The resulted a.exe will be free from libgcc_s. Please try.

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

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