[Caml-list] First release candidate for OCaml 5.2.1

[Caml-list] First release candidate for OCaml 5.2.1

[Florian Angeletti]

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Dear OCaml users, 

The release of OCaml version 5.2.1 is imminent. 
OCaml 5.2.1 is a collection of safe but import runtime time bug fixes backported from 
the 5.3 branch of OCaml. The full list of bug fixes is available below. 

In order to ensure that the future release works as expected, we are planning to test 
a release candidate during the upcoming week. 

If you find any bugs, please report them here on GitHub at 
[ https://github.com/ocaml/ocaml/issues | https://github.com/ocaml/ocaml/issues ] . 

Happy hacking, 
Florian Angeletti 

Installation Instructions 
------------------------------- 

The base compiler can be installed as an opam switch with the following commands on opam 2.1: 

opam update 
opam switch create 5.2.1~rc1 

The source code for the release candidate is available on 

- GitHub: https://github.com/ocaml/ocaml/archive/5.2.1-rc1.tar.gz 
- Inria archives: https://caml.inria.fr/pub/distrib/ocaml-5.2/ocaml-5.2.1~rc1.tar.gz 

Fine-Tuned Compiler Configuration 
---------------------------------------------- 

If you want to tweak the configuration of the compiler, you can switch to the option variant with: 

opam update 
opam switch create <switch_name> ocaml-variants.5.2.1~rc1+options <option_list> 

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

opam switch create 5.2.1~rc1+flambda+nffa ocaml-variants.5.2.1~rc1+options ocaml-option-flambda ocaml-option-no-flat-float-array 

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

---------------------------------- 

Changes Since OCaml 5.2.0 

- #13207(https://github.com/ocaml/ocaml/issues/13207): Be sure to reload the register caching the exception handler in 
caml_c_call and caml_c_call_stack_args, as its value may have been changed 
if the OCaml stack is expanded during a callback. 
(Miod Vallat, report by Vesa Karvonen, review by Gabriel Scherer and 
Xavier Leroy) 

- #13252(https://github.com/ocaml/ocaml/issues/13252): Rework register assignment in the interpreter code on m68k on Linux, 
due to the %a5 register being used by Glibc. 
(Miod Vallat, report by Stéphane Glondu, review by Gabriel Scherer and 
Xavier Leroy) 

- #13268(https://github.com/ocaml/ocaml/issues/13268): Fix a call to test in configure.ac that was causing errors when 
LDFLAGS contains several words. 
(Stéphane Glondu, review by Miod Vallat) 

- #13234(https://github.com/ocaml/ocaml/issues/13234), [#13267](https://github.com/ocaml/ocaml/issues/13267): Open runtime events file in read-write mode on armel 
(armv5) systems due to atomic operations limitations on that 
platform. 
(Stéphane Glondu, review by Miod Vallat and Vincent Laviron) 

- #13188(https://github.com/ocaml/ocaml/issues/13188): fix races in the FFI code coming from the use of Int_val(...) 
on rooted values inside blocking questions / without the runtime lock. 
(Calling Int_val(...) on non-rooted immediates is fine, but any 
access to rooted values must be done outside blocking sections / 
with the runtime lock.) 
(Etienne Millon, review by Gabriel Scherer, Jan Midtgaard, Olivier Nicole) 

- #13318(https://github.com/ocaml/ocaml/issues/13318): Fix regression in GC alarms, and fix them for flambda. 
(Guillaume Munch-Maccagnoni, report by Benjamin Monate, review by 
Vincent Laviron and Gabriel Scherer) 

- #13140(https://github.com/ocaml/ocaml/issues/13140): POWER back-end: fix issue with call to `caml_call_realloc_stack` 
from a DLL 
(Xavier Leroy, review by Miod Vallat) 

- #13370(https://github.com/ocaml/ocaml/issues/13370): Fix a low-probability crash when calling Gc.counters. 
(Demi Marie Obenour, review by Gabriel Scherer) 

- #13402(https://github.com/ocaml/ocaml/issues/13402), #13512(https://github.com/ocaml/ocaml/issues/13512), #13549(https://github.com/ocaml/ocaml/issues/13549), #13553(https://github.com/ocaml/ocaml/issues/13553): Revise bytecode implementation of callbacks 
so that it no longer produces dangling registered bytecode fragments. 
(Xavier Leroy, report by Jan Midtgaard, analysis by Stephen Dolan, 
review by Miod Vallat) 

- #13502(https://github.com/ocaml/ocaml/issues/13502): Fix misindexing related to `Gc.finalise_last` that could prevent 
finalisers from being run. 
(Nick Roberts, review by Mark Shinwell) 

- #13520(https://github.com/ocaml/ocaml/issues/13520): Fix compilation of native-code version of systhreads. Bytecode fields 
were being included in the thread descriptors. 
(David Allsopp, review by Sébastien Hinderer and Miod Vallat) 

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