Comparing all of the open issues of the llvm-project to GCC is obviously unfair. For instance over 500 issues are related to MLIR, 1700 issues are related to BOLT/lld/lldb, almost 3000 issues are related to the various clang tools that GCC does not offer (clang-tidy, clang-format, clang-doc, etc), another 442 issues are related to HLSL support, 281 issues belong to LLVM libc, various sanitizers have another 200 open issues, etc. Not to mention the extra compatibility clang offers, e.g. clang-cl, nor the fact that clang tries to be compatible with (undocumented) GCC idiosyncrasies.

Comparing open issues in the llvm-project repository is basically equivalent to comparing the open issues in GCC, binutils-gdb, glibc, and various utilities. Moreover, the LLVM project is intended as a compiler infrastructure/library framework, so it naturally has a larger surface area for bugs/issues relative to GCC. I mean, it’s not like GCC offers a generic API to interact with GIMPLE, or any other of its numerous internal representations.

> restrict is also still broken there.

That's a bit surprising to me given how heavily Rust uses the underlying mechanisms. Do you mean specifically how restrict is used in Clang or is there still something in LLVM that is broken?