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linkers-lto

Use when choosing a linker, fixing link order or undefined symbol errors, enabling LTO or ThinLTO, or cutting dead code with --gc-sections. Not for inspecting the linked binary: use elf-inspection.

.devin/skills/linkers-lto/SKILL.md

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# Linkers and LTO

The linker turns object files into one binary and decides what survives from each translation unit. Most link failures are order problems; most size wins are LTO plus dead-code removal.

## Contract

| Field | Bound contract |
|---|---|
| Trigger | The task fixes `undefined reference` or `multiple definition` errors, selects a linker, enables LTO or ThinLTO, removes dead code, controls symbol visibility, or reads a linker map. |
| Authority | Reversible local: writes only build flags, linker scripts, and build outputs; rollback is version control and a rebuild. No remote mutation. |
| Side effect | Local writes to the outputs the build produces and to build configuration the user names. |
| Done | The link succeeds with the intended flags, or the size and visibility changes are proven by the map, `--print-gc-sections`, or `nm -D` output. |

## Inputs