Code in the musl directory is based on musl revision b07d45eb01e900f0176894fdedab62285f5cb8be, which is v1.1.23, from git://git.musl-libc.org/musl.
Whole files which are unused are omitted. Changes to upstream code are wrapped
in preprocessor directives controlled by the macro __wasilibc_unmodified_upstream.
Some major known missing areas include:
- threads
- aio
- setjmp
- signals
- ipc
- termios
- nss
- environment variables
- timezones
- non-builtin locales
- TIOCGWINSZ (because cloudabi lacks it; affects isatty, line buffering for stdout)
- O_CLOEXEC, O_NOCTTY (because cloudabi lacks them)