[Caml-list] OCaml 4.12.0, first alpha release

[Caml-list] OCaml 4.12.0, first alpha release

[Florian Angeletti]

Dear OCaml users,

The set of new features for the future version 4.12.0 of OCaml has been 
frozen,
maybe a little earlier than expected.

In this new version of OCaml, the gap between the mainline and multicore 
runtime
has been considerably narrowed.
Moreover, this new version comes with a port to the newly launched 
macOs/ARM architecture.
We are thus planning to have a shorter release cycle this time around to get
this new version out the door as soon as sensible — which probably 
translates
to the beginning of January.

I am thus happy to announce the first alpha release for OCaml 4.12.0 .

This alpha version is here to help fellow hackers join us early in our bug
hunting and opam ecosystem fixing fun. You can see the progress on this 
front at:

https://github.com/ocaml/opam-repository/issues/17530

Once the major tools are supported, we will switch to beta releases.

And since changes are more fun when they come in pair, we are also testing
a new layout for the opam compiler packages.

The base compiler can now be installed as an opam switch with the 
following commands

opam update
opam switch create 4.12.0~alpha1 
--repositories=default,beta=git+https://github.com/ocaml/ocaml-beta-repository.git

If you want to tweak the configuration of the compiler, the new layout 
offers
much finer-grained options. The new command looks like this:

opam update
opam switch create <switch_name> 
--packages=ocaml-variants.4.12.0~alpha1+options,<option_list> 
--repositories=default,beta=git+https://github.com/ocaml/ocaml-beta-repository.git

where <option_list> is a comma separated list of ocaml-option-* 
packages. For instance, for a flambda and no-flat-float-array switch:

opam switch create 4.12.0~alpha1+flambda+nffa 
--packages=ocaml-variants.4.12.0~alpha1+options,ocaml-option-flambda,ocaml-option-no-flat-float-array 
--repositories=default,beta=git+https://github.com/ocaml/ocaml-beta-repository.git

All available options can be listed with "opam search ocaml-option".

If you want to test this version, it is advised to install the alpha 
opam repository

https://github.com/kit-ty-kate/opam-alpha-repository

with

opam repo add alpha git://github.com/kit-ty-kate/opam-alpha-repository.git

This alpha repository contains various fixes in the process of being 
upstreamed.

The source code for the alpha is also available at these addresses:

  https://github.com/ocaml/ocaml/archive/4.12.0-alpha1.tar.gz
  https://caml.inria.fr/pub/distrib/ocaml-4.12/ocaml-4.12.0~alpha1.tar.gz

If you find any bugs, please report them here:

  https://github.com/ocaml/ocaml/issues

If you are interested by the ongoing list of new features and fixed 
bugs, the
updated change log for OCaml 4.12.0 is available at:

   https://github.com/ocaml/ocaml/blob/4.12/Changes

Happy hacking,
Florian Angeletti for the OCaml team.

[Caml-list] OCaml 4.12.0, second alpha release

[Florian Angeletti]

Dear OCaml users,

The release of OCaml 4.12.0 is approaching. We have released a second alpha
version to help fellow hackers join us early in our bug hunting and
opam ecosystem fixing fun.

Beyond the usual bug fixes this new alpha version removes the type system change that
restricted the propagation of type information between branches of a "match".
The newly introduced warning was more troublesome than expected, the feature has
been thus postponed to 4.13 .

The base compiler can be installed as an opam switch with the following commands

opam update
opam switch create 4.12.0~alpha2 --repositories=default,beta=git+https://github.com/ocaml/ocaml-beta-repository.git

If you want to tweak the configuration of the compiler, you can pick configuration options with

opam update
opam switch create <switch_name> --packages=ocaml-variants.4.12.0~alpha2+options,<option_list> --repositories=default,beta=git+https://github.com/ocaml/ocaml-beta-repository.git

where <option_list> is a comma separated list of ocaml-option-* packages. For
instance, for a flambda and afl enabled switch:

opam switch create 4.12.0~alpha2+flambda+afl --packages=ocaml-variants.4.12.0~alpha2+options,ocaml-option-flambda,ocaml-option-afl --repositories=default,beta=git+https://github.com/ocaml/ocaml-beta-repository.git

All available options can be listed with "opam search ocaml-option".

The source code for the alpha is also available at these addresses:

 https://github.com/ocaml/ocaml/archive/4.12.0-alpha2.tar.gz
 https://caml.inria.fr/pub/distrib/ocaml-4.12/ocaml-4.12.0~alpha2.tar.gz

If you want to test this version, it is advised to install the alpha opam repository

https://github.com/kit-ty-kate/opam-alpha-repository

with

opam repo add alpha git://github.com/kit-ty-kate/opam-alpha-repository.git

This alpha repository contains various packages patched with fixes in the
process of being upstreamed. Once the repository installed, these patched
packages will take precedence over the non-patched version.

If you find any bugs, please report them here:
 https://github.com/ocaml/ocaml/issues

Happy hacking,

-- Florian Angeletti for the OCaml team.

Changes from the first alpha:
----------------------------

## Removed feature

-* #9811: remove propagation from previous branches
  Type information inferred from previous branches was propagated in
  non-principal mode. Revert this for better compatibility with
  -principal mode.
  For the time being, infringing code should result in a principality warning.
  (Jacques Garrigue, review by Thomas Refis and Gabriel Scherer)


## New bug fixes

Entries marked with "+" contains were already present in the previous alpha
but contain more bug fixes


+ #9500, #9727, #9866, #9870, +#9873: Injectivity annotations
  One can now mark type parameters as injective, which is useful for
  abstract types:
    module Vec : sig type !'a t end = struct type 'a t = 'a array end
  On non-abstract types, this can be used to check the injectivity of
  parameters. Since all parameters of record and sum types are by definition
  injective, this only makes sense for type abbreviations:
    type !'a t = 'a list
  Note that this change required making the regularity check stricter.
  (Jacques Garrigue, review by Jeremy Yallop and Leo White)


- #2195: Improve error message in bytecode stack trace printing and load
  debug information during bytecode startup if OCAMLRUNPARAM=b=2.
  (David Allsopp, review by Gabriel Scherer and Xavier Leroy)

- #10050: update {PUSH,}OFFSETCLOSURE* bytecode instructions to match new
  representation for closures
  (Nathanaël Courant, review by Xavier Leroy)

- #10035: Make sure that flambda respects atomicity in the Atomic module.
  (Guillaume Munch-Maccagnoni, review by Gabriel Scherer)

- #8796: On Windows, make Unix.utimes use FILE_FLAG_BACKUP_SEMANTICS flag
  to allow it to work with directories.
  (Daniil Baturin, review by Damien Doligez)

- #10008: Improve error message for aliases to the current compilation unit.
  (Leo White, review by Gabriel Scherer)

- #9938, #9939: Define __USE_MINGW_ANSI_STDIO=0 for the mingw-w64 ports to
  prevent their C99-compliant snprintf conflicting with ours.
  (David Allsopp, report by Michael Soegtrop, review by Xavier Leroy)

- #7813, #9955: make sure the major GC cycle doesn't get stuck in Idle state
  (Damien Doligez, report by Anders Fugmann, review by Jacques-Henri Jourdan)

- #9991: Fix reproducibility for `-no-alias-deps`
  (Leo White, review by Gabriel Scherer and Florian Angeletti)

- #9998: Use Sys.opaque_identity in CamlinternalLazy.force
  This removes extra warning 59 messages when compiling afl-instrumented
  code with flambda -O3.
  (Vincent Laviron, report by Louis Gesbert, review by Gabriel Scherer and
   Pierre Chambart)

- #9999: fix -dsource printing of the pattern (`A as x | (`B as x)).
  (Gabriel Scherer, report by Anton Bachin, review by Florian Angeletti)

- #9970, #10010: fix the declaration scope of extensible-datatype constructors.
  A regression that dates back to 4.08 makes extensible-datatype constructors
  with inline records very fragile, for example:
    type 'a t += X of {x : 'a}
  (Gabriel Scherer, review by Thomas Refis and Leo White,
   report by Nicolás Ojeda Bär)

[Caml-list] OCaml 4.12.0, third alpha release

[Florian Angeletti]

Dear OCaml users,

The release of OCaml 4.12.0 is approaching. We have released a third alpha
version to help fellow hackers join us early in our bug hunting and
opam ecosystem fixing fun.

Beyond the usual bug fixes, this new alpha version contains two small API fixes
for statmemprof and the Unix module. (Keen-eyed readers might notice a breaking
change in the change log below but this concerns a corner case of a corner case
of the type system that should not affect anyone.)

The base compiler can be installed as an opam switch with the following commands

opam update
opam switch create 4.12.0~alpha3 --repositories=default,beta=git+https://github.com/ocaml/ocaml-beta-repository.git

If you want to tweak the configuration of the compiler, you can pick configuration options with

opam update
opam switch create <switch_name> --packages=ocaml-variants.4.12.0~alpha3+options,<option_list> --repositories=default,beta=git+https://github.com/ocaml/ocaml-beta-repository.git

where <option_list> is a comma separated list of ocaml-option-* packages. For
instance, for a flambda and afl enabled switch:

opam switch create 4.12.0~alpha3+flambda+afl --packages=ocaml-variants.4.12.0~alpha3+options,ocaml-option-flambda,ocaml-option-afl --repositories=default,beta=git+https://github.com/ocaml/ocaml-beta-repository.git

All available options can be listed with "opam search ocaml-option".

The source code for the alpha is also available at these addresses:

 https://github.com/ocaml/ocaml/archive/4.12.0-alpha3.tar.gz
 https://caml.inria.fr/pub/distrib/ocaml-4.12/ocaml-4.12.0~alpha3.tar.gz

If you want to test this version, it is advised to install the alpha opam repository

https://github.com/kit-ty-kate/opam-alpha-repository

with

opam repo add alpha git://github.com/kit-ty-kate/opam-alpha-repository.git

This alpha repository contains various packages patched with fixes in the
process of being upstreamed. Once the repository installed, these patched
packages will take precedence over the non-patched version.

If you find any bugs, please report them here:
 https://github.com/ocaml/ocaml/issues

Happy hacking,

-- Florian Angeletti for the OCaml team.

Changes from the second alpha:
------------------------------

+ #1128, #7503, #9036, #9722, +#10069: EINTR-based signal handling.
   When a signal arrives, avoid running its OCaml handler in the middle
   of a blocking section. Instead, allow control to return quickly to
   a polling point where the signal handler can safely run, ensuring that

- #9907: Fix native toplevel on native Windows.
  (David Allsopp, review by Florian Angeletti)

- #10056: Memprof: ensure young_trigger is within the bounds of the minor
  heap in caml_memprof_renew_minor_sample (regression from #8684)
  (David Allsopp, review by Guillaume Munch-Maccagnoni and
  Jacques-Henri Jourdan)

- #10062: set ARCH_INT64_PRINTF_FORMAT correctly for both modes of mingw-w64
  (David Allsopp, review by Xavier Leroy)

- #10025: Track custom blocks (e.g. Bigarray) with Statmemprof
  (Stephen Dolan, review by Leo White, Gabriel Scherer and Jacques-Henri
   Jourdan)

- #10070: Fix Float.Array.blit when source and destination arrays coincide.
  (Nicolás Ojeda Bär, review by Alain Frisch and Xavier Leroy)

+ #9869, +#10073: Add Unix.SO_REUSEPORT
  (Yishuai Li, review by Xavier Leroy, amended by David Allsopp)

- #9877: manual, warn that multi-index indexing operators should be defined in
  conjunction of single-index ones.
  (Florian Angeletti, review by Hezekiah M. Carty, Gabriel Scherer,
   and Marcello Seri)

- #10046: Link all DLLs with -static-libgcc on mingw32 to prevent dependency
  on libgcc_s_sjlj-1.dll with mingw-w64 runtime 8.0.0 (previously this was
  only needed for dllunix.dll).
  (David Allsopp, report by Andreas Hauptmann, review by Xavier Leroy)

- #9896: Share the strings representing scopes, fixing some regression
  on .cmo/.cma sizes
  (Alain Frisch and Xavier Clerc, review by Gabriel Scherer)

- #10044: Always report the detected ARCH, MODEL and SYSTEM, even for bytecode-
  only builds (fixes a "configuration regression" from 4.08 for the Windows
  builds)
  (David Allsopp, review by Xavier Leroy)

- #10071: Fix bug in tests/misc/weaklifetime.ml that was reported in #10055
  (Damien Doligez and Gabriel Scherer, report by David Allsopp)

* #8907, #9878: `Typemod.normalize_signature` uses wrong environment
  Does not treat submodules differently when normalizing conjunctive types
  in polymorphic variants.
  This may break code that expose conjunctive types in inferred interface.
  (Jacques Garrigue, report and review by Leo White)

- #9739, #9747: Avoid calling type variables, types that are not variables in
  recursive occurence error messages
  (for instance, "Type variable int occurs inside int list")
  (Florian Angeletti, report by Stephen Dolan, review by Armaël Guéneau)

- #10048: Fix bug with generalized local opens.
  (Leo White, review by Thomas Refis)