clang

Guide agents through Clang-specific features: superior diagnostics, sanitizer integration, optimization remarks, static analysis, and LLVM tooling. Covers divergences from GCC and Apple/FreeBSD specifics.

| Min size | -Os | -Os or -Oz (more aggressive) | | Optimise only hot | — | -fprofile-instr-use (LLVM PGO) | | Thin LTO | -flto | -flto=thin (faster) | | Static analyser | -fanalyzer | clang --analyze or clang-tidy |

Clang's diagnostics include exact range highlighting and fix-it suggestions that GCC lacks.

Clang/LLVM compiler skill for C/C++ projects. Use when working with clang or clang++ for diagnostics, sanitizer instrumentation, optimization remarks, static analysis with clang-tidy, LTO via lld, or when migrating from GCC to Clang. Activates on queries about clang flags, clang-tidy, clang-format, better error messages, Apple/FreeBSD toolchains, or LLVM-specific optimizations. Covers flag selection, diagnostic tuning, and integration with LLVM tooling. Source: mohitmishra786/low-level-dev-skills.