options/posix: add some more feature test macros

[ElectrodeYT]

os-test shows we don't define these even though we support everything needed for them.

[no92]

The comment style is not correct. Also, are these macros supposed to be defined to the posix version or just some numeric value?

[ElectrodeYT]

The comment style is not correct. Also, are these macros supposed to be defined to the posix version or just some numeric value?

As far as I can tell, has to be at least some not-zero number, but internet says its commonly defined to the POSIX version,
for comment style, how do you think it could be done while ideally keeping what functions/features are needed for each macro? Might be useful when going through them in the future if we decide to add things such as only enabling the ones where the sysdeps required for each function are present

[no92]

The comment style should be /* comment */ to work on C89 in pedantic mode.

[ElectrodeYT]

The comment style should be /* comment */ to work on C89 in pedantic mode.

Fixed

[no92]

From the spec:
_POSIX_MEMLOCK, _POSIX_MEMLOCK_RANGE and _POSIX_SYNCHRONIZED_IO need to be defined to a value greater than zero, and the other should be defined to _POSIX_VERSION of at least POSIX 2024.

LGTM

[no92]

One line from the spec is a bit annoying:

Runtime checks with fpathconf( ), pathconf( ), or sysconf shall indicate that the option is supported.
This applies to _POSIX_MEMLOCK, _POSIX_MEMLOCK_RANGE and _POSIX_SYNCHRONIZED_IO.