940 B
940 B
Mach-O
Notes
- The start of the file must be loaded in some segment.
- The start of the file must be marked as readable + executable.
- Load command size must be divisible by 8.
- Segments must be page-aligned in the file1.
Due to the page alignment requirement on disk1 instead of just memory, MacOS is the only OS that forces you to write bloated executables on disk.
Until this check is removed, we cannot produce smaller executables.
Links
- https://github.com/apple-oss-distributions/xnu/blob/main/bsd/kern/mach_loader.c
- https://github.com/apple-oss-distributions/xnu/blob/main/EXTERNAL_HEADERS/mach-o/loader.h
- https://en.wikipedia.org/wiki/Mach-O
- https://github.com/aidansteele/osx-abi-macho-file-format-reference
- https://stackoverflow.com/questions/39863112/what-is-required-for-a-mach-o-executable-to-load