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dynamic-linking

Use when debugging shared library load failures, setting RPATH or RUNPATH, applying soname versioning, writing dlopen plugins, or intercepting with LD_PRELOAD. Not for static archives: use binutils.

.devin/skills/dynamic-linking/SKILL.md

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Sep 28, 2026
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Apache-2.0

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# Dynamic linking

Linux loads shared libraries at startup or on demand through `ld.so`. This skill builds versioned shared objects, places them where the loader finds them, and diagnoses the failures in between.

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A build or run fails with `cannot open shared object file` or `symbol lookup error`, the task sets RPATH or RUNPATH, versions a library with a soname, writes a `dlopen` plugin, or interposes a function with `LD_PRELOAD`. |
| Authority | Reversible local: writes only built `.so` files, symlinks, source, and the loader cache entries the procedure names (`ldconfig` needs root); rollback is version control, removing created symlinks, and re-running `ldconfig`. No remote mutation. |
| Side effect | Local writes to build outputs, symlinks, and `/etc/ld.so.cache` when `ldconfig` runs. Environment variables and loader flags stay inside the session. |
| Done | The binary runs against the intended library, proven by `ldd` resolving every dependency to the intended path and by a clean `LD_DEBUG=libs` trace or the plugin loading end to end. |

## Inputs