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gcc

Use when a C or C++ build uses GCC and needs build-mode flags, warning triage, debug info, LTO, PGO, or a compilation error explained. Not for Clang-only diagnostics: use clang.

.devin/skills/gcc/SKILL.md

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Observed behavior
Instructions only
Last checked
Nov 4, 2026

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55
Repository last updated
Sep 28, 2026
License
Apache-2.0

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# GCC

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A project compiles with `gcc` or `g++` and the user asks which flags to use for a build mode, how to read a warning or link error, how to enable LTO or PGO, or why a binary is too large or too slow. |
| Authority | Read-only. The skill emits flag sets, commands, and a diagnosis to chat; the user applies them to the build. Rollback is not needed because no file is written. No remote mutation. |
| Side effect | Chat output. Any throwaway compile the skill runs to confirm a flag targets a scratch file, not the project tree. |
| Done | A flag set and diagnosis are reported, every flag in it is confirmed by `gcc --help` or a scratch compile on the installed GCC, and each error symptom in the request has a named cause and fix. |

## Inputs

- Compiler version: required, from `gcc --version`. The current stable line is GCC 16.2; older lines lack some flags below and the skill checks each one.