id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	blockedby	blocking	branch_state	votes
4542	Nanosecond precision timestamps support broken on macOS / BSD / AIX / Solaris	zaytsev	zaytsev	"Followup ticket to:

* #3575 (implementation)
* #3821 (bugfix)
* #3927 (wrong AIX fix)
* #3960 (more wrong AIX)
* PR on !GitHub https://github.com/MidnightCommander/mc/pull/130

Sadly no-one came around to fix this, so packagers still disable the support manually:

https://github.com/Homebrew/homebrew-core/blob/master/Formula/m/midnight-commander.rb
https://github.com/macports/macports-ports/blame/master/sysutils/mc/Portfile

Here are the notes how to possible fix this:

---

Unfortunately, I think that the easiest way to access XNU sources from macOS 10.13 right now would be to get hired as a kernel developer by Apple. The system is not even officially released to the public yet (target date is 25th of September), and sources are usually released some time after the final release.

Anyways, I believe that source code access is not really necessary in the first place, as I would speculate that all one needs to do is to add

{{{
AC_CHECK_MEMBERS([struct stat.st_blksize, struct stat.st_rdev, struct stat.st_mtim, struct stat.st_mtimespec])
}}}

and wherever we use `HAVE_STRUCT_STAT_ST_MTIM` *or* `HAVE_UTIMENSAT` replace it with

{{{
#ifdef HAVE_STRUCT_STAT_ST_MTIM
    st.st_atim.tv_nsec = st.st_mtim.tv_nsec = st.st_ctim.tv_nsec = 0;
#elif defined HAVE_STRUCT_STAT_ST_MTIMESPEC
    st.st_atimespec.tv_nsec = st.st_mtimespec.tv_nsec = st.st_mtimespec.tv_nsec = 0;
#endif
}}}

or something along these lines and you will magically not only fix the build, but gain nanosecond precision support for macOS 10.13+ *and* BSD at the same time. Of course, cruft keeps accumulating, so ideally one should think about defining clever struct manipulation functions limiting define proliferation...

Better yet would be to undertake a major refactoring to clean up our time mess afterwards, but that's, of course, just wishful thinking."	defect	closed	major	4.8.32	mc-vfs	master	fixed		ag		3575, 3821, 3927, 3960, 3983	merged	committed-master