Re: Building liburing on musl libc gives error that errno.h not found

["Milan P. Stanić" <mps@arvanta.net>]

On Mon, 2025-06-16 at 09:35, Jens Axboe wrote:
> On 6/16/25 9:13 AM, Jens Axboe wrote:
> > On 6/16/25 8:18 AM, Milan P. Stani? wrote:
> >> On Mon, 2025-06-16 at 07:59, Jens Axboe wrote:
> >>> On 6/16/25 7:06 AM, Milan P. Stani? wrote:
> >>>> On Mon, 2025-06-16 at 06:34, Jens Axboe wrote:
> >>>>> On 6/15/25 1:56 PM, Milan P. Stani? wrote:
> >>>>>> On Sun, 2025-06-15 at 12:57, Jens Axboe wrote:
> >>>>>>> On 6/15/25 11:16 AM, Milan P. Stani? wrote:
> >>>>>>>> Hi,
> >>>>>>>>
> >>>>>>>> Trying to build liburing 2.10 on Alpine Linux with musl libc got error
> >>>>>>>> that errno.h is not found when building examples/zcrx.c
> >>>>>>>>
> >>>>>>>> Temporary I disabled build zcrx.c, merge request with patch for Alpine
> >>>>>>>> is here:
> >>>>>>>> https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/84981
> >>>>>>>> I commented in merge request that error.h is glibc specific.
> >>>>>>>
> >>>>>>> I killed it, it's not needed and should've been caught during review.
> >>>>>>> We should probably have alpine/musl as part of the CI...
> >>>>>>
> >>>>>> Fine.
> >>>>>>
> >>>>>>>> Side note: running `make runtests` gives 'Tests failed (32)'. Not sure
> >>>>>>>> should I post full log here.
> >>>>>>>
> >>>>>>> Either that or file an issue on GH. Sounds like something is very wrong
> >>>>>>> on the setup if you get failing tests, test suite should generally
> >>>>>>> pass on the current kernel, or any -stable kernel.
> >>>>>>>
> >>>>>> I'm attaching log here to this mail. Actually it is one bug but repeated
> >>>>>> in different tests, segfaults
> >>>>>
> >>>>> Your kernel is ancient, and that will surely account from some of the
> >>>>> failures you see. A 6.6 stable series from January 2024 is not current
> >>>>> by any stretch, should definitely upgrade that. But I don't think this
> >>>>> accounts for all the failures seen, it's more likely there's some musl
> >>>>> related issue as well which is affecting some of the tests.
> >>>>
> >>>> This happens also on 6.14.8-1 asahi kernel on apple m1pro machine.
> >>>> I forgot to mention this in previous mail, sorry.
> >>>
> >>> Also on musl, correct?
> >>
> >> Yes, correct.
> >>
> >>> Guessing it must be some musl oddity. I'll try and setup a vm with
> >>> alpine and see how that goes.
> >>
> >> It could be. I can ask on #musl IRC channel on libera.chat
> > 
> > Probably easier if I just take a look at it, as long as I can get
> > an alpine vm image going.
> 
> Pure guesswork, but you are most likely running into default ulimit
> limits being tiny. Probably something ala:
> 
> rc_ulimit="-n 524288 -l 262144"
> 
> in /etc/rc.conf would help.

Tried, but didn't help.

I will left it for now and return to test it when new liburing is
released. It must pass our builders and CI, so I disabled test earlier.

Thank you for help.

-- 
Kind regards