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 Sun, 18 Jan 2026 10:07:43 +0000 kikairoya wrote: > > 2026118 16:45:44 (+09:00) Takashi Yano : > > > 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? > > > > The restriction might be acceptable if there is a great gain with using > compiler-rt, but I feel linking to cyggcc_s.dll is not so bad. > > If you are planning to provide a package built with compiler-rt, especially > one that contains a DLL, I would say, "Please don't do that." It's very > different if someone decides to build their own application with compiler-rt > and takes responsibility for doing so. Before providing such a package, the > implementation of native TLS in cygwin1.dll is needed, as well as an update > to the toolchains to use it (and, I guess, it is impossible to switch with > keeping ABI). That changes the fundamental design of the distribution. I attempted to build the entire compiler-rt (builtins) as a shared library, similar to the suggestions in: https://github.com/llvm/llvm-project/blob/main/compiler-rt/lib/builtins/emutls.c#L388-L389 , and could successfully solve the problem. Could you please try 21.1.4-2 (Test)? > BTW, the profiler that provided by compiler-rt (unfortunately, it isn't included > in your package; available without -rtlib=compiler-rt, it works fine even with > libgcc_s) is definitely great; clang built with profile guided optimization > reduces 20% of walltime to build LLVM in GitHub Actions. Actually, profiler itself was included, but did not work at all. Both the compiler-rt package and the llvm package had their own issues. I have uploaded llvm 21.1.4-2 (Test) and compiler-rt 21.1.4-2 (Test), so please test the profiler as well. -- 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