llvm/llvm-project

Choose this fork if your work depends on Swift-specific LLVM/Clang/LLDB behavior or on the release process around Swift. Choose upstream if you want the broadest, least-opinionated LLVM base and the fastest access to mainline changes.

Choose this fork if you need Espressif-specific LLVM support and are prepared to live with a heavily diverged downstream branch. If you mainly want current upstream LLVM, this fork is too specialized and too far from main to be the safer default.

Choose this fork if your priority is AMD/ROCm support and you want an LLVM tree already carrying AMD-specific compiler, header, and offload work. Prefer upstream LLVM if you want the broadest compatibility and the lowest maintenance burden for non-AMD use cases.

Choose this fork if your priority is P2996 reflection experimentation in Clang. Choose upstream LLVM if you need the widest, most current compiler-toolchain surface with lower merge and maintenance risk.

Choose this fork if your goal is Z80/eZ80 LLVM support. Choose upstream LLVM if you want the latest mainstream compiler, linker, and runtime work with minimal maintenance burden.

Choose this fork if you need LLVM in a Rust-centered workflow and are prepared to manage substantial upstream drift. Choose upstream llvm/llvm-project if you want the broadest, freshest, least-surprising LLVM base.

Choose this fork if your priority is LLVM-integrated obfuscation and anti-analysis functionality. Avoid it if you mainly want upstream LLVM stability, latest fixes, and minimal maintenance overhead, because this fork is substantially specialized and already behind upstream.

Prefer this fork only if you need its MSVC-focused downstream direction and can own the maintenance cost. If you want current LLVM behavior, security fixes, and active upstream compatibility, upstream is the safer choice.

Choose this fork if you need reverse-engineering-specific LLVM extensions and can tolerate substantial upstream divergence. Choose upstream LLVM instead if you need maximum compatibility, fresh upstream fixes, and a lower-maintenance toolchain.