thr3ads.net - Libguestfs - [Libguestfs] Minimum OCaml compiler version (2021/2022 edition) [Nov 2021]

If this information is useful, please help other people find it:
Share via:

Richard W.M. Jones

2021-Nov-09 09:04 UTC

[Libguestfs] Minimum OCaml compiler version (2021/2022 edition)

Previously:
https://listman.redhat.com/archives/libguestfs/2020-March/msg00063.html
https://listman.redhat.com/archives/libguestfs/2017-September/msg00203.html

Our current minimum version across projects is 4.03.

We still use "noalloc" in a few places which causes this warning:

  ocamlopt.opt -warn-error +A-3 -c NBDKit.ml -o NBDKit.cmx
  File "NBDKit.ml", line 155, characters 0-70:
  155 | external set_name : string -> unit =
"ocaml_nbdkit_set_name" "noalloc"
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  Alert deprecated: [@@noalloc] should be used instead of "noalloc"

I just noticed now that this change was made in 4.03 -- I will go
ahead and fix this everywhere today.

Should we move to a newer minimum version?  If we moved to 4.07 then
we could also get rid of the warnings about Pervasives (replaced by
Stdlib), eg:

  File "std_utils.ml", line 329, characters 26-44:
  329 |     let sort_uniq ?(cmp = Pervasives.compare) xs                        
^^^^^^^^^^^^^^^^^^
  Alert deprecated: module Stdlib.Pervasives
  Use Stdlib instead.

However 4.07 was only released in 2018, and this would mean removing
RHEL 7 compatibility (officially -- it's sort of unofficially not
supported already).  More irritatingly, FreeBSD is stuck on 4.05.

There are no particularly compelling new features at the moment.

Here are the common distros and versions (< 4.07 marked with '*'):

  Arch (Extra)     OCaml 4.12
  Debian stable    OCaml 4.11
  Debian testing   OCaml 4.11
  Fedora 31        OCaml 4.08
  Fedora 35        OCaml 4.12
  FreeBSD (ports)  OCaml 4.05  *
  OpenSUSE         OCaml 4.13
  RHEL 7           OCaml 4.05  *
  RHEL 8           OCaml 4.07
  RHEL 9           OCaml 4.11
  Ubuntu 16.04     OCaml 4.02  *
  Ubuntu 18.04     OCaml 4.05  *
  Ubuntu 20.04     OCaml 4.08
  Ubuntu 21.04     OCaml 4.11

And here are the release dates of the OCaml compiler:

  OCaml version    Release date
  4.02             2014-08
  4.03             2016-04
  4.04             2016-11
  4.05             2017-07
  4.06             2017-11
  4.07             2018-07
  4.08             2019-06
  4.09             2019-09
  4.10             2020-02
  4.11             2020-08
  4.12             2021-02
  4.13             2021-09

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v

Richard W.M. Jones

2021-Nov-09 09:59 UTC

head link

[Libguestfs] Minimum OCaml compiler version (2021/2022 edition)

On Tue, Nov 09, 2021 at 09:04:40AM +0000, Richard W.M. Jones
wrote:> Previously:
> https://listman.redhat.com/archives/libguestfs/2020-March/msg00063.html
> https://listman.redhat.com/archives/libguestfs/2017-September/msg00203.html
> 
> Our current minimum version across projects is 4.03.
> 
> We still use "noalloc" in a few places which causes this warning:
> 
>   ocamlopt.opt -warn-error +A-3 -c NBDKit.ml -o NBDKit.cmx
>   File "NBDKit.ml", line 155, characters 0-70:
>   155 | external set_name : string -> unit =
"ocaml_nbdkit_set_name" "noalloc"
>        
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>   Alert deprecated: [@@noalloc] should be used instead of
"noalloc"
> 
> I just noticed now that this change was made in 4.03 -- I will go
> ahead and fix this everywhere today.
> 
> Should we move to a newer minimum version?  If we moved to 4.07 then
> we could also get rid of the warnings about Pervasives (replaced by
> Stdlib), eg:
> 
>   File "std_utils.ml", line 329, characters 26-44:
>   329 |     let sort_uniq ?(cmp = Pervasives.compare) xs >              
^^^^^^^^^^^^^^^^^^
>   Alert deprecated: module Stdlib.Pervasives
>   Use Stdlib instead.
> 
> However 4.07 was only released in 2018, and this would mean removing
> RHEL 7 compatibility (officially -- it's sort of unofficially not
> supported already).  More irritatingly, FreeBSD is stuck on 4.05.
> 
> There are no particularly compelling new features at the moment.
Actually there are some:

If we moved to 4.04, then a few features open up in this file
(look for "4.04"):

https://github.com/libguestfs/libguestfs-common/blob/master/mlstdutils/std_utils.ml

It looks like this would be possible.
> Here are the common distros and versions (< 4.07 marked with
'*'):
> 
>   Arch (Extra)     OCaml 4.12
>   Debian stable    OCaml 4.11
>   Debian testing   OCaml 4.11
>   Fedora 31        OCaml 4.08
>   Fedora 35        OCaml 4.12
>   FreeBSD (ports)  OCaml 4.05  *
>   OpenSUSE         OCaml 4.13
>   RHEL 7           OCaml 4.05  *
>   RHEL 8           OCaml 4.07
>   RHEL 9           OCaml 4.11
>   Ubuntu 16.04     OCaml 4.02  *
>   Ubuntu 18.04     OCaml 4.05  *
>   Ubuntu 20.04     OCaml 4.08
>   Ubuntu 21.04     OCaml 4.11
> 
> And here are the release dates of the OCaml compiler:
> 
>   OCaml version    Release date
>   4.02             2014-08
>   4.03             2016-04
>   4.04             2016-11
>   4.05             2017-07
>   4.06             2017-11
>   4.07             2018-07
>   4.08             2019-06
>   4.09             2019-09
>   4.10             2020-02
>   4.11             2020-08
>   4.12             2021-02
>   4.13             2021-09
Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v

Laszlo Ersek

2021-Nov-09 12:18 UTC

head link

[Libguestfs] Minimum OCaml compiler version (2021/2022 edition)

On 11/09/21 10:04, Richard W.M. Jones wrote:> Previously:
> https://listman.redhat.com/archives/libguestfs/2020-March/msg00063.html
> https://listman.redhat.com/archives/libguestfs/2017-September/msg00203.html
> 
> Our current minimum version across projects is 4.03.
> 
> We still use "noalloc" in a few places which causes this warning:
> 
>   ocamlopt.opt -warn-error +A-3 -c NBDKit.ml -o NBDKit.cmx
>   File "NBDKit.ml", line 155, characters 0-70:
>   155 | external set_name : string -> unit =
"ocaml_nbdkit_set_name" "noalloc"
>        
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>   Alert deprecated: [@@noalloc] should be used instead of
"noalloc"
> 
> I just noticed now that this change was made in 4.03 -- I will go
> ahead and fix this everywhere today.
> 
> Should we move to a newer minimum version?  If we moved to 4.07 then
> we could also get rid of the warnings about Pervasives (replaced by
> Stdlib), eg:
> 
>   File "std_utils.ml", line 329, characters 26-44:
>   329 |     let sort_uniq ?(cmp = Pervasives.compare) xs >              
^^^^^^^^^^^^^^^^^^
>   Alert deprecated: module Stdlib.Pervasives
>   Use Stdlib instead.
> 
> However 4.07 was only released in 2018, and this would mean removing
> RHEL 7 compatibility (officially -- it's sort of unofficially not
> supported already).  More irritatingly, FreeBSD is stuck on 4.05.
Can we loop in FreeBSD people directly? Do they have an upgrade path?

(I did my best to build libguestfs & friends on RHEL-7, as you know, but
it was just impossible. I'm on Fedora 34 now, and have little sympathy
for other "old" Linux distros left, as a result -- they should *all*
have upgrade paths, I expect?)

Thanks
Laszlo
> 
> There are no particularly compelling new features at the moment.
> 
> Here are the common distros and versions (< 4.07 marked with
'*'):
> 
>   Arch (Extra)     OCaml 4.12
>   Debian stable    OCaml 4.11
>   Debian testing   OCaml 4.11
>   Fedora 31        OCaml 4.08
>   Fedora 35        OCaml 4.12
>   FreeBSD (ports)  OCaml 4.05  *
>   OpenSUSE         OCaml 4.13
>   RHEL 7           OCaml 4.05  *
>   RHEL 8           OCaml 4.07
>   RHEL 9           OCaml 4.11
>   Ubuntu 16.04     OCaml 4.02  *
>   Ubuntu 18.04     OCaml 4.05  *
>   Ubuntu 20.04     OCaml 4.08
>   Ubuntu 21.04     OCaml 4.11
> 
> And here are the release dates of the OCaml compiler:
> 
>   OCaml version    Release date
>   4.02             2014-08
>   4.03             2016-04
>   4.04             2016-11
>   4.05             2017-07
>   4.06             2017-11
>   4.07             2018-07
>   4.08             2019-06
>   4.09             2019-09
>   4.10             2020-02
>   4.11             2020-08
>   4.12             2021-02
>   4.13             2021-09
> 
> Rich.
>

Daniel P. Berrangé

2021-Nov-09 12:24 UTC

head link

[Libguestfs] Minimum OCaml compiler version (2021/2022 edition)

On Tue, Nov 09, 2021 at 09:04:40AM +0000, Richard W.M. Jones
wrote:> Previously:
> https://listman.redhat.com/archives/libguestfs/2020-March/msg00063.html
> https://listman.redhat.com/archives/libguestfs/2017-September/msg00203.html
> 
> Our current minimum version across projects is 4.03.
> 
> We still use "noalloc" in a few places which causes this warning:
> 
>   ocamlopt.opt -warn-error +A-3 -c NBDKit.ml -o NBDKit.cmx
>   File "NBDKit.ml", line 155, characters 0-70:
>   155 | external set_name : string -> unit =
"ocaml_nbdkit_set_name" "noalloc"
>        
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>   Alert deprecated: [@@noalloc] should be used instead of
"noalloc"
> 
> I just noticed now that this change was made in 4.03 -- I will go
> ahead and fix this everywhere today.
> 
> Should we move to a newer minimum version?  If we moved to 4.07 then
> we could also get rid of the warnings about Pervasives (replaced by
> Stdlib), eg:
> 
>   File "std_utils.ml", line 329, characters 26-44:
>   329 |     let sort_uniq ?(cmp = Pervasives.compare) xs >              
^^^^^^^^^^^^^^^^^^
>   Alert deprecated: module Stdlib.Pervasives
>   Use Stdlib instead.
> 
> However 4.07 was only released in 2018, and this would mean removing
> RHEL 7 compatibility (officially -- it's sort of unofficially not
> supported already).  More irritatingly, FreeBSD is stuck on 4.05.
Note both libvirt and QEMU have explicitly dropped RHEL-7
as a supported build platform[1], under the rule that platforms
are dropped 2 years after the new major version is released.

It has been > 2 years since RHEL-8 GA, so they dropped RHEL-7.

IOW even if new libguestfs can build on RHEL-7, you'll be
stuck with old libvirt and QEMU.
> Here are the common distros and versions (< 4.07 marked with
'*'):
> 
>   Arch (Extra)     OCaml 4.12
>   Debian stable    OCaml 4.11
>   Debian testing   OCaml 4.11
>   Fedora 31        OCaml 4.08
>   Fedora 35        OCaml 4.12
>   FreeBSD (ports)  OCaml 4.05  *
>   OpenSUSE         OCaml 4.13
>   RHEL 7           OCaml 4.05  *
>   RHEL 8           OCaml 4.07
>   RHEL 9           OCaml 4.11
>   Ubuntu 16.04     OCaml 4.02  *
Ubuntu 16.04 is explicitly dropped by both QEMU and libvirt too
a long time ago. It falls under both the 2 year cut off rule,
an the maximum of two major releases in concurrently rules.

NB, QEMU/libvirt only look at Ubuntu LTS releases for cutoffs
>   Ubuntu 18.04     OCaml 4.05  *
>   Ubuntu 20.04     OCaml 4.08
>   Ubuntu 21.04     OCaml 4.11
> 
> And here are the release dates of the OCaml compiler:
> 
>   OCaml version    Release date
>   4.02             2014-08
>   4.03             2016-04
>   4.04             2016-11
>   4.05             2017-07
>   4.06             2017-11
>   4.07             2018-07
>   4.08             2019-06
>   4.09             2019-09
>   4.10             2020-02
>   4.11             2020-08
>   4.12             2021-02
>   4.13             2021-09
Regards,
Daniel

[1] https://www.qemu.org/docs/master/about/build-platforms.html
    https://libvirt.org/platforms.html

-- 
|: https://berrange.com      -o-    https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org         -o-            https://fstop138.berrange.com :|
|: https://entangle-photo.org    -o-    https://www.instagram.com/dberrange :|

Libguestfs - Nov 2021 - Minimum OCaml compiler version (2021/2022 edition)

[Libguestfs] Minimum OCaml compiler version (2021/2022 edition)

[Libguestfs] Minimum OCaml compiler version (2021/2022 edition)

[Libguestfs] Minimum OCaml compiler version (2021/2022 edition)

[Libguestfs] Minimum OCaml compiler version (2021/2022 edition)