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laketowncr

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August 29, 2015
Programming
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 laketowncr

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kubo39

August 29, 2015
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Transcript

  1. Laketowncr kubo39

  2. Crystal binary size 619KB to 704bytes • Repo: https://github.com/kubo39/tinycr

  3. 619KB → 528KB • --release build 632962bytes →540050bytes

  4. 528KB → 454KB • Use strip command 540050bytes → 463944bytes

  5. 454KB → 10592bytes • --prelude=empty prelude.crではなくemtpy.crをロードする 必要なライブラリは適宜自前でrequire • https://github.com/kubo39/tinycr/commit/c0d 2e519902fa7a9cee57a004acda656f3e10e8f

    - libpcre依存とか消せる - この時点でインラインアセンブラ書いたりしてるが あまり意味ない

  6. 10592bytes → 6272bytes • to_unsafe Stringクラスのunsafeを自前で定義しなおす • https://github.com/kubo39/tinycr/commit/63d 5c8be5eabdf268509053aef8525064afb3eeb •

    この時点でlibc以外の依存がなくなった

  7. 6272bytes →5480bytes • eglibc捨ててmusl libcに静的リンク • https://github.com/kubo39/tinycr/commit/973 284df2cd59e25245858cc79c38e3097770f6b • とうとう依存がなくなった！！

    ldd helloでも確認

  8. 5480bytes → 5400bytes • --gc-sections - リンク時に不要なセクション削除 • https://github.com/kubo39/tinycr/commit/d4c 568bda484c1b7c1a9a35f02b08a4cad7fc15c

  9. 5400bytes → 5360bytes • エントリポイントをmainにする 普通にやるとsegvるのでexit(2)で終了 • https://github.com/kubo39/tinycr/commit/afcc 7aca613ce59b171b6850f1f4e130fba6e44c

  10. 5360bytes →704bytes • というかもうlibc依存する処理一切ないよね、という わけで--nostdlib渡す • https://github.com/kubo39/tinycr/commit/e2b 77fe1855aa36579459bb8f5096eae93eed4ca • これでもちゃんと実行できます