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.
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
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
Runtime System:
-
#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: 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: Fix a call to test in configure.ac that was causing errors when
LDFLAGS contains several words.
(Stéphane Glondu, review by Miod Vallat) -
#13234, #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: 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: 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: POWER back-end: fix issue with call to
caml_call_realloc_stack
from a DLL
(Xavier Leroy, review by Miod Vallat) -
#13370: Fix a low-probability crash when calling Gc.counters.
(Demi Marie Obenour, review by Gabriel Scherer) -
#13402, #13512, #13549, #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: Fix misindexing related to
Gc.finalise_last
that could prevent
finalisers from being run.
(Nick Roberts, review by Mark Shinwell) -
#13520: Fix compilation of native-code version of systhreads. Bytecode fields
were being included in the thread descriptors.
(David Allsopp, review by SĂ©bastien Hinderer and Miod Vallat)