Rahul Butani
ca59a201ca
libc++ has switched to using `__attribute__((using_if_exists))` to handle incomplete libc implementations; see: https://github.com/llvm/llvm-project/commit/a9c9183ca42629fa83cdda297d1d30c7bc1d7c91 These essentially require a modern C++ compiler (clang gained support in LLVM 13: https://github.com/llvm/llvm-project/commit/369c64839946d89cf5697550b6feeea031b2f270, gcc appears to not have support yet: https://gcc.gnu.org/bugzilla//show_bug.cgi?id=105584). Previously this was not an issue for us (despite the transition happening around LLVM 13) but something about the changes to the libc++/libc++-abi build has made it so that on platforms with incomplete libc impls (i.e. Darwin is missing `quick_exit`/`at_quick_exit`) we error during the `libcxx-abi` build when the stdenv's (older, not supporting `using_if_exists`) compiler tries to import libc symbols that aren't present. The libc++ docs suggest we use a modern compiler to build libc++ anyways (https://releases.llvm.org/15.0.0/projects/libcxx/docs/index.html#platform-and-compiler-support) so this commit uses stdenv's containing the package set's clang to build libcxx/libcxx-abi. This is similar to how libc++ bootstrapping builds (https://releases.llvm.org/15.0.0/projects/libcxx/docs/BuildingLibcxx.html#bootstrapping-build) work.
Nixpkgs is a collection of over 80,000 software packages that can be installed with the Nix package manager. It also implements NixOS, a purely-functional Linux distribution.
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Nixpkgs is licensed under the MIT License.
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