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clang

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Use when a C or C++ build uses clang and needs diagnostics, optimization remarks, clang-tidy, ThinLTO with lld, LLVM PGO, or a GCC-to-Clang migration. Not for LLVM IR work: use llvm.

.devin/skills/clang/SKILL.md

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Sep 28, 2026
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Apache-2.0

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# Clang

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A project compiles with `clang` or `clang++` and the user asks for better diagnostics, wants to see what the optimizer did or skipped, wants static analysis with clang-tidy, needs LTO through lld or LLVM PGO, or is moving a GCC build to Clang. |
| Authority | Read-only. The skill emits flags, commands, and readings to chat; `clang-tidy --fix` is shown but the user runs it. Rollback is not needed because no project file is written. No remote mutation. |
| Side effect | Chat output. Scratch compiles target a scratch file, never the project tree. |
| Done | The requested flag set or command is reported, every flag in it is confirmed against the installed Clang, and every remark or diagnostic in the request has a reading and a next action. |

## Inputs

- Compiler version: required, from `clang --version`. The current stable line is LLVM/Clang 23.1.0; Apple's `clang` reports an Apple version and lags upstream.