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Working version
---------------
### Language features:
- #9975, #11365: Make empty types (`type t = |`) immediate.
(Antal Spector-Zabusky, review by Gabriel Scherer)
- #11297: Report "unclosed" error when "done" is missing in a "do .. done"
construct.
(Nicolás Ojeda Bär)
- #11457: Remove old polymorphic variant syntax.
(Stefan Muenzel, review by Gabriel Scherer and Jacques Garrigue)
* #11565: Enable -strict-formats by default.
(Nicolás Ojeda Bär, review by David Allsopp)
* #11694: Add short syntax for generative functor types `() -> ...`
(Jeremy Yallop, review by Gabriel Scherer, Nicolás Ojeda Bär,
Jacques Garrigue)
### Runtime system:
- #11750: Decouple major slice from minor GC.
(KC Sivaramakrishnan, review by Sadiq Jaffer, Guillaume Munch-Maccagnoni and
Damien Doligez)
- #11641: Restore Cygwin port. Add GC messages for address space reservations
when OCAMLRUNPARAM option v includes 0x1000.
(David Allsopp, review by Xavier Leroy, Guillaume Munch-Maccagnoni
and Gabriel Scherer)
- #11743: Speed up weak array operations
(KC Sivaramakrishnan, review by François Bobot and Sadiq Jaffer)
- #11691, #11706: use __asm__ instead of asm for strict ISO C conformance
(Xavier Leroy, report by Gregg Reynolds , review by Sadiq Jaffer)
- #11764: add prototypes to old-style C function definitions and declarations
(Antonin Décimo, review by Xavier Leroy)
- #11796: protect lazy computation of code fragment digest by a mutex.
This makes the thread sanitizer happier, and avoids duplicating
the hashing work.
(Gabriel Scherer, review by Xavier Leroy, report by Olivier Nicole)
- #11137: new `Unsafe_store_tag(val, new_tag)` macro to stop using
`Tag_val(val)` as lvalue.
(Gabriel Scherer, review by Xavier Leroy, Guillaume Munch-Maccagnoni
and Nicolás Ojeda Bär)
- #11880: Restore the correct sigmask in systhreads.
(Christiano Haesbaert, review by Guillaume Munch-Maccagnoni and
Sébastien Hinderer)
- #11881: Fix thread-unsafety of registration of operations for "custom"
values.
(Guillaume Munch-Maccagnoni, review by Gabriel Scherer and KC
Sivaramakrishnan)
### Type system:
- #6941, #11187: prohibit using classes through recursive modules
inheriting or including a class belonging to a mutually-recursive module
would previous behave incorrectly, and now results in a clean error.
(Leo White, review by Gabriel Scherer and Florian Angeletti)
- #11879: Bugfix for Ctype.nondep_type
(Stephen Dolan, review by Gabriel Scherer)
### Code generation and optimizations:
- #8998, #11321, #11430: change mangling of OCaml long identifiers
from `camlModule__name_NNN` to `camlModule.name_NNN`. The previous
mangling schema, using `__`, was ambiguous.
(Xavier Leroy, report by sliquister and Michael Bacarella,
review by Gabriel Scherer)
- #10834: The -safer-matching option disables type-based optimizations of
pattern-matching compilation. This allows to produce a match failure if
a pattern-matching was wrongly assumed to be exhaustive. Since the
exhaustiveness check for GADTs has had bugs in the past, it may be
useful if you need extra security with GADTs.
(Jacques Garrigue, review by Gabriel Scherer)
- #11102: Speed up register allocation by permanently spilling registers
(Stephen Dolan, review by Xavier Leroy)
- #11418, #11708: RISC-V multicore support.
(Nicolás Ojeda Bär, review by KC Sivaramakrishnan)
- #11686: Better spilling heuristic for the Linear Scan allocator for more
efficient stack usage.
(Nicolás Ojeda Bär, Gabriel Scherer, Alain Frisch, review by Gabriel Scherer,
Alain Frisch and Nathanaëlle Courant)
### Standard library:
- #11883, #11884: Update documentation for In_channel and Out_channel
with examples and sections to group related functions.
(Kiran Gopinathan, review by Daniel Bünzli and Xavier Leroy)
- #11848: Add `List.find_mapi`, `List.find_index`, `Seq.find_mapi`,
`Seq.find_index`, `Array.find_mapi`, `Array.find_index`,
`Float.Array.find_opt`, `Float.Array.find_index`, `Float.Array.find_map`,
`Float.Array.find_mapi`.
(Sima Kinsart, review by Daniel Bünzli and Nicolás Ojeda Bär)
- #11859: Make Stdlib.(@) and List.append tail-recursive and faster.
(Jeremy Yallop, review by Daniel Bünzli, Anil Madhavapeddy, and Bannerets)
- #11856: Rewrite List.concat_map using TRMC, making it faster
as well as tail-recursive.
(Jeremy Yallop, review by Nicolás Ojeda Bär and Gabriel Scherer)
- #11836, #11837: Add `Array.map_inplace`, `Array.mapi_inplace`,
`Float.Array.mapi_inplace` and `Float.Array.mapi_inplace`.
(Léo Andrès, review by Gabriel Scherer, KC Sivaramakrishnan and
Nicolás Ojeda Bär)
- #11410: Add Set.to_list, Map.to_list, Map.of_list, Map.add_to_list,
(Daniel Bünzli, review by Nicolás Ojeda Bär and Gabriel Scherer)
- #11128: Add In_channel.isatty, Out_channel.isatty.
(Nicolás Ojeda Bär, review by Gabriel Scherer and Florian Angeletti)
- #10859: Add `Format.pp_print_iter` and `Format.pp_print_array`.
(Léo Andrès and Daniel Bünzli, review by David Allsopp and Hugo Heuzard)
- #10789: Add `Stack.drop`
(Léo Andrès, review by Gabriel Scherer)
* #10899: Change Stdlib.nan from signaling NaN to quiet NaN.
(Greta Yorsh, review by Xavier Leroy, Guillaume Melquiond and
Gabriel Scherer)
- #11026, #11667, #11858: Rename the type of the accumulator
of fold functions to 'acc:
fold_left : ('acc -> 'a -> 'acc) -> 'acc -> 'a list -> 'acc
fold_right : ('a -> 'acc -> 'acc) -> 'a list -> 'acc -> 'acc
fold_left_map : ('acc -> 'a -> 'acc * 'b) -> 'acc -> 'a list -> 'acc * 'b list
...
(Valentin Gatien-Baron and Francois Berenger,
review by Gabriel Scherer and Nicolás Ojeda Bär)
- #11246: Add "hash" and "seeded_hash" functions to Bool, Int, Char, Float,
Int32, Int64, and Nativeint.
(Nicolás Ojeda Bär, review by Xavier Leroy and Gabriel Scherer)
- #11354: Hashtbl.find_all is now tail-recursive.
(Fermín Reig, review by Gabriel Scherer)
- #11500: Make Hashtbl.mem non-allocating.
(Simmo Saan, review by Nicolás Ojeda Bär)
- #11362: Rewrite List.map, List.mapi and List.map2 using TRMC, making them
faster as well as tail-recursive.
(Nicolás Ojeda Bär, review by Gabriel Scherer)
- #11412: Add Sys.is_regular_file
(Xavier Leroy, review by Anil Madhavapeddy, Nicolás Ojeda Bär, David Allsopp)
- #11402: Rewrite List.init, List.filter, List.filteri, List.filter_map and
List.of_seq using TRMC instead of an accumulator, making them faster and
halving memory usage while remaining tail-recursive.
(Nicolás Ojeda Bär, review by Xavier Leroy and Gabriel Scherer)
- #11476: Add examples in documentation of Hashtbl, Queue, Atomic, Format
(Simon Cruanes, review by Yotam Barnoy, Gabriel Scherer, Daniel Bünzli,
Ulugbek Abdullaev, and Nicolás Ojeda Bär)
- #11488: Add Mutex.protect for resource-safe critical sections protected by
a mutex.
(Simon Cruanes, review by Gabriel Scherer, Xavier Leroy,
Guillaume Munch-Maccagnoni)
- #11581: Add type equality witness `type (_, _) eq = Equal: ('a, 'a) eq` in a
new module Stdlib.Type.
(Nicolás Ojeda Bär, review by Daniel Bünzli, Jacques Garrigue, Florian
Angeletti, Alain Frisch, Gabriel Scherer, Jeremy Yallop and Xavier Leroy)
- #11830: Add Type.Id
(Daniel Bünzli, review by Jeremy Yallop, Gabriel Scherer, Wiktor Kuchta,
Nicolás Ojeda Bär)
- #11843: Add `In_channel.input_lines` and `In_channel.fold_lines`.
(Xavier Leroy, review by Nicolás Ojeda Bär and Wiktor Kuchta).
### Other libraries:
- #11374: Remove pointer cast to a type with stricter alignment requirements
in Windows implementation of Unix.gettimeofday. Windows implementations of
caml_unix_map_file, caml_unix_lseek and caml_unix_lseek_64 now release the
runtime lock. Windows implementation of caml_unix_lockf modernised and
simplified. Where possible, 64 bit integers are used instead of LARGE_INTEGER
structs.
(David Allsopp, review by Jonah Beckford and Xavier Leroy)
- #11475: Make Unix terminal interface bindings domain-safe
(Olivier Nicole and Xavier Leroy, review by Xavier Leroy)
- #11775: Unix.write on a non-blocking socket under Windows will return normally
if the write blocks after some data has already been written (as otherwise
there is no way of knowing how much data has been written before
blocking). The same behaviour was already present under Unix.
(Nicolás Ojeda Bär, review by David Allsopp)
### Tools:
- #1172: fix ocamlyacc's handling of raw string literals
(Demi Marie Obenour)
- #9290: Add a directive to switch off debugging in toplevel.
This allows to see optimized bytecode with -dlambda.
(Jacques Garrigue, review by Gabriel Scherer)
- #11166: ocamllex: the union of two character sets "cset1 | cset2" can now be
used in any context where a character set is expected.
(Nicolás Ojeda Bär, Martin Jambon, review by Sébastien Hinderer)
- #11773: ocamlyacc: Do not allow quoted literals (such as 'a' or "bc")
in a token name or %type declaration. Previously such literals were
accepted by ocamlyacc, but produced malformed OCaml that was rejected
by the compiler.
(Demi Marie Obenour)
- #11774: ocamlyacc: fail if there is an I/O error
(Demi Marie Obenour)
### Manual and documentation:
- #9430, #11291: Document the general desugaring rules for binding operators.
(Gabriel Scherer, review by Nicolás Ojeda Bär)
- #11481: Fix the type of Unix.umask to Unix.file_perm -> Unix.file_perm
(Favonia, review by Sébastien Hinderer)
- #11676: Fix missing since annotation in the `Sys` and `Format` modules
(Github user Bukolab99, review by Florian Angeletti)
### Compiler user-interface and warnings:
- #10009: Improve the error reported by mismatched struct/sig and =/: in module
and module type bindings.
(Jules Aguillon, review by Gabriel Scherer)
- #11530: Include kinds in kind mismatch error message.
(Leonhard Markert, review by Gabriel Scherer and Florian Angeletti)
- #10818: Preserve integer literal formatting in type hint.
(Leonhard Markert, review by Gabriel Scherer and Florian Angeletti)
- #11338: Turn some partial application warnings into hints.
(Leo White, review by Stephen Dolan)
- #10911: Improve the location reported by parenthesized assert expressions
(Fabian Hemmer, review by Gabriel Scherer)
- #1391, #7645, #3922: Add an early error when compiling different
modules with mismatching -for-pack
(Pierre Chambart and Vincent Laviron, review by Mark Shinwell)
- #11635, #5461, #10564: Turn warning 31 (Module_linked_twice) into a hard error
(Hugo Heuzard, review by Valentin Gatien-Baron and Gabriel Scherer)
- #11646: Add colors to error message hints.
(Christiana Anthony, review by Florian Angeletti)
- #11653: Add the -no-absname option to ocamlc, ocamlopt and ocamldep.
(Abiola Abdulsalam, review by Sébastien Hinderer and Florian Angeletti)
- #11696: Add the -no-g option to ocamlc and ocamlopt.
(Abiola Abdulsalam, review by Sébastien Hinderer, Nicolás Ojeda Bär and
Florian Angeletti)
- #11722: clearer error messages on non-well-founded type definitions
(Gabriel Scherer, review by Jacques Garrigue)
- #11819: make the `native_compiler` and `native_dynlink` configuration
variables available through ocamlc -config.
(Sébastien Hinderer, review by Gabriel Scherer and David Allsopp)
- #11235, #11864: usage warnings for constructors and fields can now be disabled
on field-by-field or constructor-by-constructor basis
(Florian Angeletti, review by Gabriel Scherer)
- #8602, #11863: Add -stop-after lambda flag option
(Douglas Smith and Dmitrii Kosarev, review by Gabriel Scherer)
### Internal/compiler-libs changes:
- #11847, #11849, #11851: small refactorings in the type checker
(Gabriel Scherer, review by Nicolás Ojeda Bär)
- #11027: Separate typing counter-examples from type_pat into retype_pat;
type_pat is no longer in CPS.
(Jacques Garrigue and Takafumi Saikawa, review by Gabriel Scherer)
- #11018, #11869: Clean up Types.Variance, adding a description of
the lattice used, and defining explicitly composition.
(Jacques Garrigue, review by Gabriel Scherer and Jeremy Yallop)
- #11286, #11515: disambiguate identifiers by using how recently they have
been bound in the current environment
(Florian Angeletti, review by Gabriel Scherer)
- #11364: Allow `make -C testsuite promote` to take `TEST` and `LIST` variables
(Antal Spector-Zabusky, review by Gabriel Scherer and David Allsopp)
- #11446: document switch compilation (lambda/switch.ml)
(Gabriel Scherer, review by Luc Maranget and Vincent Laviron)
- #11536: Introduce wrapper functions for level management
([Ctype.with_level], etc) and for type variable scoping
([Typetexp.with_local_type_variable_scope]).
The older API ([Ctype.(begin_def,end_def)], [Typetexp.(narrow,widen)], etc.)
is now removed.
(Jacques Garrigue and Takafumi Saikawa, review by Gabriel Scherer)
- #11568: Encode inline record types in Path.t
(Leo White and Hyunggyu Jang, review by Gabriel Scherer)
- #11569: Remove hash type encoding
(Hyunggyu Jang, review by Gabriel Scherer and Florian Angeletti)
- #11601, #11612, #11628: Clean up some global state handling
in emitcode, bytepackager, spill.
(Hugo Heuzard, Stefan Muenzel, review by Vincent Laviron, Gabriel Scherer
and Nathanaëlle Courant)
- #11627: use return values instead of globals for linear scan intervals
(Stefan Muenzel, review by Nicolás Ojeda Bär)
- #11634: Dll.open_dll now properly handle opening for execution while already
opened for checking
(Hugo Heuzard, review by Nicolás Ojeda Bär)
- #11745: Debugger and toplevels: embed printer types rather than
reading their representations from topdirs.cmi at runtime.
(Sébastien Hinderer, review by Florian Angeletti, Nicolás Ojeda Bär and
Gabriel Scherer)
- #11615: remove global variables form asmcomp/linearize.ml
(Stefan Muenzel, review by Nicolás Ojeda Bär
- #10856: Add location, attribute(s) visitors to Tast_mapper/Tast_iterator
(Yan Dong, review by Nicolás Ojeda Bär and Gabriel Scherer)
- #11763, #11759, #11861: Enable stricter C compilation warnings, use
strict prototypes on primitives.
(Antonin Décimo, review by Xavier Leroy, David Allsopp and Sébastien
Hinderer)
### Build system:
- #11590: Allow installing to a destination path containing spaces.
(Élie Brami, review by Sébastien Hinderer and David Allsopp)
- #11243, #11248, #11268, #11420, #11675: merge the sub-makefiles into
the root Makefile.
(Sébastien Hinderer, review by David Allsopp and Florian Angeletti)
- #11828: Compile otherlibs/ C stubs in two version for native and bytecode
(Olivier Nicole, review by Sébastien Hinderer and Xavier Leroy)
### Bug fixes:
- #10664, #11600: Unsoundness in the typing of polymorphic methods
involving polymorphic variants
(Jacques Garrigue, report by Mike Shulman, review by Gabriel Scherer)
- #11302, #11412: `ocamlc` and `ocamlopt` should not remove generated files
when they are not regular files.
(Xavier Leroy, report by Thierry Martinez, review by
Anil Madhavapeddy, Nicolás Ojeda Bär, David Allsopp)
- #10348, #10560, #11561: Expand GADT equations lazily during unification to
avoid ambiguity
(Jacques Garrigue, review by Leo White)
- #11436: Fix wrong stack backtrace for out-of-bound exceptions raised
by leaf functions.
(Tom Kelly and Xavier Leroy, review by Mark Shinwell)
- #11643: Add missing test declaration to float_compare test, so that it will
run.
(Stefan Muenzel, review by David Allsopp)
- #11630: Use correct location when reporting record labels with non-existent
paths.
(Nicolás Ojeda Bär, report by Jason Gross, review by Gabriel Scherer)
- #11727: Ensure push_defaults can push past module patterns, fixing an
currying optimisation accidentally disabled by #10340.
(Stephen Dolan, review by Gabriel Scherer)
- #11732: Ensure that types from packed modules are always generalised
(Stephen Dolan and Leo White, review by Jacques Garrigue)
- #11771: Use a more relaxed mode for unification in Ctype.subst
(Leo White, review by Jacques Garrigue and Gabriel Scherer)
- #11776: Extend environment with functor parameters in `strengthen_lazy`.
(Chris Casinghino and Luke Maurer, review by Gabriel Scherer)
- #11803, #11808: on x86, the destination of an integer comparison must be
a register, it cannot be a stack slot.
(Vincent Laviron, review by Xavier Leroy, report by
Emilio Jesús Gallego Arias)
- #11809: Protect Parmatch.pats_of_type from missing cmis
(Jacques Garrigue, review by Stephen Dolan and Gabriel Scherer)
- #11824: Fix a crash when calling `ocamlrun -b`
(Florian Angeletti, review by Sébastien Hinderer)
- #11815: Marshalling continuations raises invalid argument exception.
(Jérôme Vouillon, review by Nicolás Ojeda Bär, Stephen Dolan and
Hugo Heuzard)
- #11850: When stopping before the `emit` phase (using `-stop-after`), an empty
temporary assembly file is no longer left in the file system.
(Nicolás Ojeda Bär, review by Gabriel Scherer and Xavier Leroy)
OCaml 5.0
---------
- #10831: Multicore OCaml
(Enguerrand Decorne, Stephen Dolan, Tom Kelly, Sadiq Jaffer,
Anil Madhavapeddy, Sudha Parimala, KC Sivaramakrishnan,
Leo White, the Tarides multicore team,
review by Florian Angeletti, Damien Doligez, Xavier Leroy,
Guillaume Munch-Maccagnoni, Olivier Nicole, Nicolás Ojeda Bär,
Gabriel Scherer, the OCaml core development team, and many
other valued reviewers.)
### Language features:
### Runtime system:
- #11400: Runtime events counters fixes
Fixes mismatch between OCaml and C APIs, removes events from 4.x that
are not present in the 5.0 GC and adds some missing probes.
(Sadiq Jaffer, review by Gabriel Scherer, Florian Angeletti)
- #11368: Runtime events buffer size OCAMLRUNPARAMS fix
The runtime events buffer size can now be set via the 'e' OCAMLRUNPARAM.
This is previously mistakenly enabled/disabled tracing instead.
(Sadiq Jaffer, review by KC Sivaramakrishnan, David Allsopp, Damien Doligez)
- #11308: Add environment variable to preserve runtime_events after exit
If the environment variable OCAML_RUNTIME_EVENTS_PRESERVE exists then the
runtime will not remove the runtime events ring buffers at exit. This
makes tracing very short running programs more reliable.
(Sadiq Jaffer, review by KC Sivaramakrishnan)
- #10964: Ring-buffer based runtime tracing (runtime_events)
Runtime_events is a very low overhead runtime tracing system designed for
continuous monitoring of OCaml applications.
(Sadiq Jaffer, review by Anil Madhavapeddy, Enguerrand Decorne,
Richard Warburton, Gabriel Scherer, Sabine Schmaltz, Florian Angeletti,
Patrick Ferris, Tom Kelly)
* #10723: do not use `-flat-namespace` linking for macOS.
(Carlo Cabrera, review by Damien Doligez)
* #10863, #10933: Remove support for old, unprefixed C runtime function names
such as `alloc`. The new names prefixed with `caml_` must be used instead,
such as `caml_alloc`. Consequently, it is no longer needed to define
`CAML_NAME_SPACE` to avoid bringing unprefixed names into scope: this is now
the default behavior.
(Nicolás Ojeda Bär, review by Xavier Leroy)
- #10902: Do not register empty code fragments in natdynlink.
(David Allsopp, review by Xavier Leroy and Damien Doligez)
- #10965: `caml_fatal_error_hook`, GC timing hooks, and
`caml_scan_roots_hook` are now atomic variables. Restore GC timing
hooks in multicore.
(Guillaume Munch-Maccagnoni, review by Enguerrand Decorne, Xavier
Leroy, Gabriel Scherer, and KC Sivaramakrishnan)
- #11209: Add a public and thread-safe timing hook running at domain
termination, after this domain has stopped running any OCaml code:
`caml_domain_terminated_hook`. This can be useful for implementing
domain-local state in C.
(Guillaume Munch-Maccagnoni, review by Xavier Leroy and Gabriel
Scherer)
- #10875, #11731: Add option to allocate fiber stacks and sigaltstacks with
mmap(MAP_STACK) instead of malloc. This is exposed via a configure
--enable-mmap-map-stack option, and is enabled by default on OpenBSD where
it is mandatory.
(Anil Madhavapeddy, review by Gabriel Scherer, Tom Kelly,
Michael Hendricks and KC Sivaramakrishnan).
- #10950: Do not use mmap to allocate Caml_state.
In order to reduce virtual memory usage, we dynamically allocate
the domain_state structure.
(Enguerrand Decorne, KC Sivaramakrishnan and Tom Kelly,
review by Anil Madhavapeddy and Gabriel Scherer)
- #11010: Use strerror_r for reentrant error string conversion.
(Anil Madhavapeddy and Xavier Leroy, review by same and Edwin Török)
- #11002, #11066, #11086: Do not use Begin_roots/End_roots macros in
the runtime system. Also fix a missing root registration in the
implementation of Unix.write on Windows.
(Nicolás Ojeda Bär, Daniel Bünzli and Antonin Décimo,
review by Xavier Leroy and David Allsopp)
- #11022: Track GC work for all managed bigarray allocations
(Stephen Dolan, report by Andrew Hunter, review by Damien Doligez)
- #10802: Use 4.12 value macros and helpers in C code
(Antonin Décimo, review by Gabriel Scherer)
- #11105: Fix handling of fiber stack cache with multiple domains
(Jon Ludlam, KC Sivaramakrishnan and Tom Kelly)
- #11054: Respect user provided maximum stack space
Make sure the stack we initially request is sized accordingly to
the user provided settings. tmc/stack_space is also updated by
this PR in order to account for this change.
(Enguerrand Decorne, report by Jon Ludlam,
review by Tom Kelly, KC Sivaramakrishnan and Gabriel Scherer)
- #11238: Increase the default limit for the stack size to 128 Mi words,
i.e. 1 Gib for 64-bit platforms and 512 Mib for 32-bit platforms.
(Xavier Leroy, review by Sébastien Hinderer)
- #11284: Use compression of entries scheme when pruning mark stack.
Can decrease memory usage for some workloads, otherwise should be
unobservable.
(Tom Kelly, review by Sabine Schmaltz, Sadiq Jaffer and Damien Doligez)
* #11295: An ISO C 2011 compliant compiler, including full support for atomic
types, is now required to build the OCaml runtime system.
(Xavier Leroy, review by David Allsopp and Sébastien Hinderer)
- #10915, #11039, #11057, #11095, #11190: Implement quality treatment for
asynchronous actions in multicore. Reimplement the old behaviour of
`caml_process_pending*` for multicore.
(Guillaume Munch-Maccagnoni, review by Sadiq Jaffer and Gabriel Scherer)
- #11303: Ensure that GC is not invoked from bounds check failures
(Stephen Dolan, review by Sadiq Jaffer and Xavier Leroy)
- #11304: Fix data race on Windows file descriptors
(Olivier Nicole and Xavier Leroy, review by Xavier Leroy, David Allsopp,
and Sadiq Jaffer)
* #11337: pass 'flags' metadata to root scanners, to optimize stack
scanning in the bytecode interpreter.
Changes the interface of user-provided root-scanning hooks.
(Gabriel Scherer, review by Xavier Leroy,
Guillaume Munch-Maccagnoni, Sadiq Jaffer and Tom Kelly)
- #11144: Restore frame-pointers support for amd64
(Fabrice Buoro, review by Frederic Bour and KC Sivaramakrishnan)
* #11255: in the C interface, `&Field(v, i)` now has type `volatile value *`
instead of `value *` in OCaml 4. This makes the memory model
for mixed OCaml/C code better defined, but can cause warnings or type
errors in user C code.
(KC Sivaramakrishnan, review by Xavier Leroy, Gabriel Scherer and
Guillaume Munch-Maccagnoni, additional discussions with Stephen
Dolan and Luc Maranget)
- #5299, #4787, #11138, #11272, #11506: To help debugging, `Caml_state`
now dynamically checks that the domain lock is held, and fails
otherwise (with a fatal error at most entry points of the C API, or
systematically in debug mode). A new variable `Caml_state_opt` is
introduced, and is `NULL` when the domain lock is not held. This
allows to test from C code if the current thread holds the lock of
its domain.
(Guillaume Munch-Maccagnoni, review by Florian Angeletti, Damien
Doligez, Sadiq Jaffer, Xavier Leroy, and Gabriel Scherer)
- #11223: The serialization format of custom blocks changed in 4.08,
but the deserializer would still support the pre-4.08 format. OCaml
5.x removed support for this old format; provide a clear error message
in this case.
(Hugo Heuzard, review by Gabriel Scherer)
- #11504, #11522: Use static allocation in `caml_make_float_vect` in
no-flat-float-array mode, it's more efficient and avoids a a race condition
(Xavier Leroy, report by Guillaume Munch-Maccagnoni, review by David Allsopp)
- #11652: Fix benign off-by-one error in Windows implementation of caml_mem_map.
(David Allsopp, review by Gabriel Scherer)
- #11669, #11704: Fix construction of Effect.Unhandled exceptions in the
bytecode interpreter.
(David Allsopp and Xavier Leroy, report by Samuel Hym, review by Xavier Leroy
and Gabriel Scherer)
### Code generation and optimizations:
- #10972: ARM64 multicore support: OCaml & C stack separation;
dynamic stack size checks; fiber and effects support.
(Tom Kelly and Xavier Leroy, review by KC Sivaramakrishnan, Xavier Leroy
Guillaume Munch-Maccagnoni, Eduardo Rafael, Stephen Dolan and
Gabriel Scherer)
* #10845 Emit frametable size on amd64 BSD (OpenBSD, FreeBSD, NetBSD) systems
(emitted for Linux in #8805)
(Hannes Mehnert, review by Nicolás Ojeda Bär)
- #11134: Optimise 'include struct' in more cases
(Stephen Dolan, review by Leo White and Vincent Laviron)
### Standard library:
- #10742: Use LXM as the pseudo-random number generator for module Random.
Add `Random.State.split` and `Random.split` to "split" a PRNG off
another PRNG.
(Xavier Leroy, review by Gabriel Scherer and Hugo Heuzard)
* #10867, #11345: Remove deprecated values: Array.create, Array.make_float,
Array.create_matrix, Bytes.uppercase, Bytes.lowercase, Bytes.capitalize,
Bytes.uncapitalize, Char.lowercase, Char.uppercase, Filename.temp_dir_name,
Int32.format, Int64.format, Nativeint.format, Format.bprintf, Format.kprintf,
Format.set_all_formatter_output_functions,
Format.get_all_formatter_output_functions,
Format.pp_set_all_formatter_output_functions,
Format.pp_get_all_formatter_output_functions, Format.pp_open_tag,
Format.pp_close_tag, Format.open_tag, Format.close_tag,
Format.formatter_tag_functions, Format.pp_set_formatter_tag_functions,
Format.pp_get_formatter_tag_functions, Format.set_formatter_tag_functions,
Format.get_formatter_tag_functions, Gc (mutability of the fields of type
Gc.control), Lazy.lazy_from_fun, Lazy.lazy_from_val, Lazy.lazy_is_val,
Obj.set_tag, Obj.truncate, Obj.final_tag, Obj.extension_constructor,
Obj.extension_name, Obj.extension_id, Scanf.stdib, Scanf.fscanf,
Scanf.kfscanf, Stdlib.( & ), Stdlib.( or ), String.set, String.copy,
String.fill, String.unsafe_set, String.unsafe_fill, String.uppercase,
String.lowercase, String.capitalize, String.uncapitalize, Thread.kill,
Thread.wait_write, Thread.wait_read, the whole ThreadUnix module, the
infix operator (.[]<-).
(Nicolás Ojeda Bär, review by Damien Doligez)
* #10896: Remove Stream, Genlex and Pervasives. Also remove legacy standalone
bigarray library (the Bigarray module is now part of the standard library).
(Nicolás Ojeda Bär, review by Kate Deplaix and Anil Madhavapeddy)
- #10921: Use getentropy, when available, to seed the generator during
`Random.self_init`
(Michael Hendricks, review by Gabriel Scherer, Xavier Leroy, and
Anil Madhavapeddy)
* #10924: Add deprecated attribute to Printexc.catch, Printf.kprintf and
Unix.SO_ERROR.
(Nicolás Ojeda Bär, review by Damien Doligez)
- #10986: Add Scanf.sscanf_opt, Scanf.bscanf_opt and Scanf.scanf_opt.
(Nicolás Ojeda Bär, review by Florian Angeletti and Gabriel Scherer)
* #11157: Rename "hash" in the "Hashtbl.SeededHashedType" signature to
"seeded_hash". This allows defining both seeded and unseeded hash functions in
the same module.
(Nicolás Ojeda Bär, review by Gabriel Scherer and Xavier Leroy)
- #8878: Add String.hash and String.seeded_hash.
(Tom Kelly, review by Alain Frisch and Nicolás Ojeda Bär)
### Other libraries:
* #9071, #9100, #10935: Reimplement `Thread.exit()` as raising the
exception `Thread.Exit`, and mark `Thread.exit` as deprecated.
The new implementation changes the behavior compared with
the OCaml 4 implementation. For example, the new implementation
causes `Fun.finally` finalizers to be run and catch-all exception
handlers to prevent termination.
(Jacques-Henri Jourdan and Xavier Leroy, review by Damien Doligez,
Guillaume Munch-Maccagnoni, Gabriel Scherer, and Enguerrand Decorne)
- #11034: Dynlink library, add a global lock to make dynlinking
thread-safe.
(Florian Angeletti, review by Gabriel Scherer)
- #11087: deprecate Thread.wait_timed_read, Thread.wait_timed_write,
Thread.select, Thread.wait_pid. The same functionality is available in the
Unix module.
(Nicolás Ojeda Bär, review by Anil Madhavapeddy)
- #11309, #11424, #11427, #11545: Add Domain.recommended_domain_count.
(Christiano Haesbaert, Konstantin Belousov, review by David Allsopp,
KC Sivaramakrishnan, Gabriel Scherer, Nicolas Ojeda Bar)
- #11461, #11466: Fix gethostbyaddr for IPv6 arguments and make it domain-safe
(Olivier Nicole, Nicolás Ojeda Bär, David Allsopp and Xavier Leroy,
review by the same)
- #11479: Make Unix.symlink domain-safe on Windows
(Olivier Nicole, review by Xavier Leroy and David Allsopp)
### Tools:
* #11004: Litmus tests for checking the implementation of the
memory model.
(Luc Maranget, review by Gabriel Scherer and Xavier Leroy)
- #11024: Handle alerts in ocamldoc.
The alert `[@@alert deprecated]` is handled specifically and it's no longer
needed to duplicate the deprecated annotation (the alert for the compiler and
the tag for the documentation). Every other alerts also appear in the
documentation.
(Jules Aguillon, review by Florian Angeletti)
- #11065: Port the bytecode debugger to 5.0, adding support for effect handlers.
(Damien Doligez and @fabbing, review by @fabbing and Xavier Leroy)
- #11079: Add the -nobanners option to dumpobj.
(Sébastien Hinderer, review by Gabriel Scherer and Vincent Laviron)
- #11100: Fix ocamltest to make sure failed tests are not counted as
"unexpected error".
(Damien Doligez, review by Sébastien Hinderer)
- #11245: Merge the common code of ocamlcp and ocamloptp into a single module.
(David Allsopp, review by Sébastien Hinderer)
- #11382: OCamlmktop use a new initialization module "OCamlmktop_init" to
preserve backward-compatibility with user-module provided modules that install
toplevel printers.
(Florian Angeletti, review by Gabriel Scherer and David Allsopp)
### Manual and documentation:
- #11058: runtime/HACKING.adoc tips on debugging the runtime
(Gabriel Scherer, review by Enguerrand Decorne and Nicolás Ojeda Bär)
- #11093: Add an effect handlers tutorial
(KC Sivaramakrishnan, review by François Pottier, Gabriel Scherer, François
Bobot and Wiktor Kuchta)
- #11192: Better documentation for condition variables.
(François Pottier, review by Luc Maranget, Xavier Leroy, and Wiktor Kuchta)
- #11093: Add tutorials on parallelism features and the relaxed memory model
(KC Sivaramakrishnan, review by Damien Doligez, Anil Madhavapeddy, Gabriel
Scherer, Thomas Leonard, Tom Ridge, Xavier Leroy, Luc Maranget, Fabrice
Buoro, Olivier Nicole, Guillaume Munch-Maccagnoni, Jacques-Henri Jourdan)
- #11640, #11647: Add missing options to the man pages:
flambda commonly-used options, and negative options (`-no-rectypes`, ... ).
(Amandine Nangah, review by David Allsopp, Florian Angeletti,
Sébastien Hinderer, and Vincent Laviron)
- #11813: Make new multicore chapters easier to discover, and emphasize impact
on C bindings.
(Edwin Török, review by KC Sivaramakrishnan, and Florian Angeletti)
### Compiler user-interface and warnings:
- #9140, #11131: New command-line flag -nocwd to not include implicit
the current directory to the load path.
(Thomas Roglin, review by Gabriel Scherer and Nicolás Ojeda Bär)
- #11089: Add 'since <version>' information to compiler warnings.
(André Maroneze, review by Florian Angeletti and Gabriel Scherer)
- #10909: Disable warning 59 (assignment to immutable blocks) unless flambda
invariant checks are enabled.
(Vincent Laviron, review by Gabriel Scherer)
- #10981, #11276: Implement a -cmi-file option for ocamlc and ocamlopt.
(Sébastien Hinderer, review by Damien Doligez, Daniel Bünzli and
Florian Angeletti)
* #11049: Stop padding 1-digit compiler minor version numbers.
(So for instance OCaml 5.0 rather than 5.00)
(Sébastien Hinderer, review by David Allsopp, Florian Angeletti and
Xavier Leroy)
- #11184, #11670: Stop calling ranlib on created / installed libraries
(Sébastien Hinderer and Xavier Leroy, review by the same)
- #11253: Deprecate `ocaml script` and `ocamlnat` script where `script` has no
extension and is an implicit basename.
(David Allsopp, review by Florian Angeletti and Sébastien Hinderer)
### Internal/compiler-libs changes:
- #10878, #10909: restore flambda after the Multicore merge.
(Vincent Laviron, review by Gabriel Scherer and Xavier Leroy)
- #10864, #10888: restore afl-fuzz mode for sequential programs.
(Jan Midtgaard, review by Xavier Leroy and Gabriel Scherer)
- #11008, #11047: rework GC statistics in the Multicore runtime
(Gabriel Scherer, review by Enguerrand Decorne)
- #11058: basic debugging documentation in runtime/HACKING.adoc
(Gabriel Scherer, review by Enguerrand Decorne and Nicolás Ojeda Bär)
- #11199: Stop installing topdirs.cmi twice. The toplevel now reads topdirs.cmi
from +compiler-libs, as the debugger does.
(David Allsopp, review by Sébastien Hinderer)
- #11007, #11399: META files for the stdlib, compiler-libs and other libraries
(unix, dynlink, str, runtime_events, threads, ocamldoc) are now installed
along with the compiler.
(David Allsopp, Florian Angeletti, Nicolás Ojeda Bär and Sébastien Hinderer,
review by Daniel Bünzli, Kate Deplaix, Anil Madhavapeddy and Gabriel Scherer)
### Build system:
* #10893: Remove configuration options --disable-force-safe-string and
DEFAULT_STRING=unsafe as well as --enable-force-safe-string and
DEFAULT_STRING=safe which are now the default unconditionally.
(Kate Deplaix, review by Gabriel Scherer and David Allsopp)
- #11092: Build native-code compilers on OpenBSD/aarch64.
(Christopher Zimmermann, review by Anil Madhavapeddy)
- #11126: Build system: make it possible to choose which ocamldep
(and flags) to use when computing dependencies for the compiler.
Add a -no-slash option to ocamldep to let users override -slash.
(Sébastien Hinderer, review by David Allsopp)
- #11147: Factorize the stdlib-related compilation flags. Make it
possible to control them consistently through the STDLIBFLAGS
build variable. Make sure ocamldoc and ocamllex get compiled and
linked with debugging information (-g).
(Sébastien Hinderer, review by Gabriel Scherer)
- #11149: Make the bootstrap process reproducible on systems with non-big-endian
floating point. If the boot/ artefacts are up-to-date, this means that running
make bootstrap on any platform should not change the images in boot/ and paves
the way for automated testing that the bootstrap is repeatable.
(David Allsopp, review by Damien Doligez and Sébastien Hinderer)
- #11160: otherlibs: merge win32unix into unix.
(Sébastien Hinderer, review by David Allsopp, Nicolás Ojeda Bär,
Xavier Leroy, Vincent Laviron and Antonin Décimo)
* #11198, #11298: Install the Dynlink, Str and Unix libraries to individual
subdirectories of LIBDIR. The compiler, debugger and toplevel automatically
add `-I +lib` if required, but display an alert.
(David Allsopp, review by Florian Angeletti, Nicolás Ojeda Bär,
Valentin Gatien-Baron and Sébastien Hinderer)
- #11200: Install ocamlprof's Profiling runtime module to a +profiling,
removing it from the default namespace.
(David Allsopp, review by Sébastien Hinderer)
- #11294: Switch minimum required autoconf to 2.71.
(David Allsopp, review by Xavier Leroy)
- #11370, #11373: Don't pass CFLAGS to flexlink during configure.
(David Allsopp, report by William Hu, review by Xavier Leroy and
Sébastien Hinderer)
- #11487: Thwart FMA test optimization during configure
(William Hu, review by David Allsopp and Sébastien Hinderer)
- #11097: Build native-code compilers on NetBSD/aarch64
(Kate Deplaix, review by Anil Madhavapeddy)
### Bug fixes:
- #10768, #11340: Fix typechecking regression when combining first class
modules and GADTs.
(Jacques Garrigue, report by François Thiré, review by Matthew Ryan)
- #10790: don't drop variance and injectivity annotations when pretty printing
`with` constraints (for example, `with type +!'a t = ...`).
(Florian Angeletti, report by Luke Maurer, review by Matthew Ryan and
Gabriel Scherer)
- #11167: Fix memory leak from signal stack.
(Antoni Żewierżejew, review by Gabriel Scherer and Enguerrand Decorne)
- #11112: harden -use-runtime against spaces or quotes in the provided path
(Gabriel Scherer, report by Brahima Dibassi, review by David Allsopp)
- #11068, #11070: Fix typo in function name given in Unix_error exception for
Unix.readlink on Windows.
(David Allsopp, report by Xia Li-yao)
- #10807: Don't duplicate standard handles in the child process
spawned by win32unix Unix.create_process if the handles were already
inheritable. Fix broken signalling of EOF on standard handles if
they were already inheritable.
(Antonin Décimo, review by Xavier Leroy and Nicolás Ojeda Bär)
- #10868: Fix off-by-1 bug when initializing frame hashtables
(Jonah Beckford, review by Tom Kelly, Nicolás Ojeda Bär and
KC Sivaramakrishnan)
- #11077: Make dumpobj compatible with absence of naked pointer support
(Olivier Nicole and Jan Midtgaard, review by Gabriel Scherer)
- #11111: fix fork() usage in ocamltest C code.
When calling fork() from C code with the Multicore runtime active,
one needs to call caml_atfork_hook() on the forked child before it
can use the OCaml runtime.
(Gabriel Scherer, review by Xavier Leroy, report by Brahima Dibassi)
- #10809: Use the WSA_FLAG_NO_HANDLE_INHERIT on Windows when creating
sockets with WSASocket if the cloexec (non-inheritable) parameter is
true. Fixes a race condition where a child process could inherit the
socket and deadlock the parent.
(Antonin Décimo, review by Xavier Leroy)
- #11186, #11188: Fix composition of coercions with aliases
(Vincent Laviron, report and review by Leo White)
- #11194, #11609: Fix inconsistent type variable names in "unbound type var"
messages
(Ulysse Gérard and Florian Angeletti, review Florian Angeletti and
Gabriel Scherer)
- #11204: Fix regression introduced in 4.14.0 that would trigger Warning 17 when
calling virtual methods introduced by constraining the self type from within
the class definition.
(Nicolás Ojeda Bär, review by Leo White)
- #11263, #11267: caml/misc.h: check whether `_MSC_VER` is defined before using
it to ensure that the headers can always be used in code which turns on
-Wundef (or equivalent).
(David Allsopp and Nicolás Ojeda Bär, review by Nicolás Ojeda Bär and
Sébastien Hinderer)
- #11289, #11405: fix some leaks on systhread termination
(Fabrice Buoro, Enguerrand Decorne, Gabriel Scherer,
review by Xavier Leroy and Florian Angeletti, report by Romain Beauxis)
- #11314, #11416: fix non-informative error message for module inclusion
(Florian Angeletti, report by Thierry Martinez, review by Gabriel Scherer)
- #11358, #11379: Refactor the initialization of bytecode threading,
This avoids a "dangling pointer" warning of GCC 12.1.
(Xavier Leroy, report by Armaël Guéneau, review by Gabriel Scherer)
- #11387, module type with constraints no longer crash the compiler in presence
of both shadowing warnings and the `-bin-annot` compiler flag.
(Florian Angeletti, report by Christophe Raffalli, review by Gabriel Scherer)
- #11392, #11392: assertion failure with -rectypes and external definitions
(Gabriel Scherer, review by Florian Angeletti, report by Dmitrii Kosarev)
- #11417: Fix regression allowing virtual methods in non-virtual classes.
(Leo White, review by Florian Angeletti)
- #11468: Fix regression from #10186 (OCaml 4.13) detecting IPv6 on Windows for
mingw-w64 i686 port.
(David Allsopp, review by Xavier Leroy and Sébastien Hinderer)
- #11482, #11542: Fix random crash in large closure allocation
(Damien Doligez, report by Thierry Martinez and Vincent Laviron, review by
Xavier Leroy)
- #11508, #11509: make Bytes.escaped domain-safe
(Christiano Haesbaert and Gabriel Scherer,
review by Xavier Leroy,
report by Jan Midtgaard and Tom Kelly)
- #11516, #11524: Fix the `deprecated_mutable` attribute.
(Chris Casinghino, review by Nicolás Ojeda Bär and Florian Angeletti)
- #11576: Fix bug in Bigarray.Genarray.init in the the case of zero-dimensional
arrays.
(Nicolás Ojeda Bär, Jeremy Yallop, report by Masayuki Takeda, review by Jeremy
Yallop and Florian Angeletti)
- #11587: Prevent integer comparison from being used on pointers
(Vincent Laviron, review by Gabriel Scherer)
- #11622: Prevent stack overflow when printing a constructor or record
mismatch error involving recursive types.
(Florian Angeletti, review by Gabriel Scherer)
- #11662, #11673: fix a memory leak when using Dynlink,
the bug was only present in development version of OCaml 5.
(Stephen Dolan, report by Andre Maroneze, review by Gabriel Scherer)
- #11737: Fix segfault condition in Unix.stat under Windows in the presence of
multiple threads.
(Marc Lasson, Nicolás Ojeda Bär, review by Gabriel Scherer and David Allsopp)
- #11533, #11534: follow synonyms again in #show_module_type
(this had stopped working in 4.14.0)
(Gabriel Scherer, review by Jacques Garrigue and Florian Angeletti,
report by Yaron Minsky)
OCaml 4.14.0 (28 March 2022)
----------------------------
### Language features:
- #10462: Add attribute to produce a compiler error for polls.
(Sadiq Jaffer, review by Mark Shinwell, Stephen Dolan
and Guillaume Munch-Maccagnoni)
- #10437: Allow explicit binders for type variables.
(Stephen Dolan, review by Leo White)
- #10441: Remove unnecessary parentheses surrounding immediate objects.