macOS Big Sur 11.0.1以降では、システム提供される共有ライブラリファイル(dylib)はファイルシステム上に実体が存在しない。
macOS Big Sur 11.0.1 リリースノートより引用(下線部は強調)。
New in macOS Big Sur 11.0.1, the system ships with a built-in dynamic linker cache of all system-provided libraries. As part of this change, copies of dynamic libraries are no longer present on the filesystem. Code that attempts to check for dynamic library presence by looking for a file at a path or enumerating a directory will fail. Instead, check for library presence by attempting to
macOS Big Sur 11.0.1 Release Notes | Apple Developer Documentationdlopen()
the path, which will correctly check for the library in the cache. (62986286)
macOS Ventura 13.4.1での実行結果:
$ otool -L /usr/bin/otool /usr/bin/otool: /usr/lib/libxcselect.dylib (compatibility version 1.0.0, current version 1.0.0) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1319.100.3) $ file /usr/lib/libSystem.B.dylib /usr/lib/libSystem.B.dylib: cannot open `/usr/lib/libSystem.B.dylib' (No such file or directory)
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