Re: Request to update libc++ related packages for current Clang/LLVM toolchain
Takashi Yano via Cygwin <[email protected]>
| Newsgroups | gmane.os.cygwin |
|---|---|
| Message-ID | <[email protected]> |
On Thu, 15 Jan 2026 21:53:21 +0900 Takashi Yano wrote: > On Sun, 11 Jan 2026 23:11:00 +0200 > Florin wrote: > > Hello Cygwin list, > > > > Ive 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 didnt 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. I also uploaded 21.1.4-1 (Test) which works with clang/llvm 21.1.4-1 (Test). This test version does not have the problem above. -- Takashi Yano <[email protected]> -- 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