OCaml Changelog

Fixed

• Undid the change to the pipe code to restore compatibility with Windows (#403, @MisterDA)

Fixes

• Fix race condition when a document was being edited and dune in watch mode was running (#1005, fixes #941, #1003)

Added

• Report all parsing errors in Markdown files (#389, @NathanReb)

Changed

• Preserve indentation in multiline OCaml blocks in .mli files (#395, @panglesd)
• Rename the Normal syntax to Markdown to better explain what the syntax is and moved it to Mdx.Syntax (#412, @Leonidas-from-XIV)

Fixed

• Fixed compatibility with Cmdliner 1.1.0 (#371, @Leonidas-from-XIV)
• Report errors and exit codes of toplevel directives (#382, @talex5, @Leonidas-from-XIV)
• Fix block locations in error reporting (#389, @NathanReb)
• Include the content of the line that features the part-end MDX directive in the output, before that line would've been dropped (#374, #387, @Leonidas-from-XIV)
• Handle EINTR signal on waitpid call by restarting the syscall. (#409, @tmcgilchrist)
• Fix parsing of multiline toplevel phrases in .mli files (#394, #397, @Leonidas-from-XIV)

Removed

• Removed warning about missing semicolons added in MDX 1.11.0 and the automatic insertion of semicolons in the corrected files introduced in MDX 2.0.0. (#398, @Leonidas-from-XIV)

Features

• Enable semantic highlighting support by default (#933)

• Support connecting over pipes and socket. Pipes on Windows aren't yet supported (#946)

  More about communication channels in LSP specification.

• Re-enable ocamlformat-rpc for formatting code snippets (but not files and not on Windows) (#920, #939)

  One needs to have installed either ocamlformat package version > 0.21.0 or, otherwise, ocamlformat-rpc package. Note that previously ocamlformat-rpc came in a standalone OPAM package, but since ocamlformat version > 0.21.0, it comes within ocamlformat package.

• Add custom ocamllsp/hoverExtended request (#561)

• Support utf-8 position encoding clients (#919)

  More about position encoding in LSP specification.

• Show unwrapped module alias types on hovering over module names. This is due to upgrading to merlin 4.7 and using merlin's verbosity=smart by default (#942)

Fixes

• Respect the client's completion item resolve and preSelect capabilities (#925, #936)

• Disable polling for dune's watch mode on Windows and OCaml 4.14.0 (#935)

• Fix semantic highlighting of "long identifiers," e.g., Foo.Bar.x (#932)

• Fix syncing of document contents:

  • For ranges that span an entire line (#927)
  • Previously, whole line edits would incorrectly eat the newline characters (#971)

• Bump the compatibility to 4.08+ (#393 @emillon)
• Load @toplevel_printer annotated printers for functors (#378 @metavinek)
• Do not display a backtrace when exiting normally (#399 #398 @emillon)

Changes in OCaml 4.14.1 (20 December 2022)

Compiler User-Interface and Warnings:

• #11184, #11670: Stop calling ranlib on created / installed libraries (Sébastien Hinderer and Xavier Leroy, review by the same)

Build System:

• #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 optimisation during configure (William Hu, review by David Allsopp and Sébastien Hinderer)

Bug Fixes:

• #10768, #11340: Fix typechecking regression when combining first class modules and GADTs. (Jacques Garrigue, report by François Thiré, review by Matthew Ryan)

• #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/{memory,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)

• #11314, #11416: Fix non-informative error message for module inclusion (Florian Angeletti, report by Thierry Martinez, review by Gabriel Scherer)

• #11358, #11379: Refactor the initialisation 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 a regression which allowed 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)

• #11489, #11496: More prudent deallocation of alternate signal stack (Xavier Leroy, report by @rajdakin, review by Florian Angeletti)

• #11516, #11524: Fix the deprecated_mutable attribute. (Chris Casinghino, review by Nicolás Ojeda Bär and Florian Angeletti)

• #11194, #11609: Fix inconsistent type variable names in "unbound type var" messages (Ulysse Gérard and Florian Angeletti, review Florian Angeletti and Gabriel Scherer)

• #11622: Prevent stack overflow when printing a constructor or record mismatch error involving recursive types. (Florian Angeletti, review by Gabriel Scherer)

• #11732: Ensure that types from packed modules are always generalised (Stephen Dolan and Leo White, review by Jacques Garrigue)

• #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)

• #11776: Extend environment with functor parameters in strengthen_lazy. (Chris Casinghino and Luke Maurer, review by Gabriel Scherer)

• #11533, #11534: Follow synonyms again in #show_module_type (this had stopped working in 4.14.0) (Gabriel Scherer, review by Jacques Garrigue, report by Yaron Minsky)

• #11768, #11788: Fix crash at start-up of bytecode programs in no-naked-pointers mode caused by wrong initialisation of caml_global_data (Xavier Leroy, report by Etienne Millon, 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)

OCaml 5.0.0 (16 December 2022)

• #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.)

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)

• (breaking change) #10723: do not use -flat-namespace linking for macOS. (Carlo Cabrera, review by Damien Doligez)

• (breaking change) #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)

• (breaking change) #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)

• (breaking change) #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)

• (breaking change) #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)

• (breaking change) #10845 Emit frametable size on amd64 BSD (OpenBSD, FreeBSD, NetBSD) systems (emitted for Linux in #8805) (Hannes Mehnert, review by Nicolás Ojeda Bär)

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)

• (breaking change) #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)

• (breaking change) #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)

• (breaking change) #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)

• (breaking change) #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:

• (breaking change) #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:

• (breaking change) #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: Add Flambda commonly-used options to the ocamlopt manpage (Amandine Nangah, review by David Allsopp, Florian Angeletti, Sébastien Hinderer, and Vincent Laviron)

• #11676: Fix missing since annotation in the Sys and Format modules (Github user Bukolab99, review by Florian Angeletti)

• #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 ' 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)

• (breaking change) #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:

• (breaking change) #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)

• (breaking change) #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)

• #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)

• #11732: Ensure that types from packed modules are always generalised (Stephen Dolan and Leo White, review by Jacques Garrigue)

• #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)

• #11776: Extend environment with functor parameters in strengthen_lazy. (Chris Casinghino and Luke Maurer, review by Gabriel Scherer)

• #11533, #11534: follow synonyms again in #show_module_type (this had stopped working in 4.14.0) (Gabriel Scherer, review by Jacques Garrigue, report by Yaron Minsky)

• Add support for OCaml 5.0. Dose3 >= 6.1 and base64 >= 3.1.0 are now required [#5357 @kit-ty-kate @dra27 - fix #5354]
• [BUG] Fix all empty conflict explanation messages [#5378 @kit-ty-kate - partial fix #4373]

Additions

• New unstable option --as-json for the HTML renderer that emits HTML fragments (preamble, content) together with metadata (table of contents, breadcrumbs, whether katex is used) in JSON format. (@sabine, #908)
• New maths support via {m ... } and {math ... } tags. (@giltho, @gpetiot, #886)
• Various optimisations (@jonludlam, #870, #883)
• Better handling of alerts and deprecation notices. (@panglesd, #828)
• Handle language tags on code blocks (@julow, #848)

Bugfixes

• Shadowing issues (@jonludlam, #853)
• Layout fixes and improvements (@panglesd, #832, #839, #847)
• Handle comments on class constraints and inherit (@julow, #844)
• Disable the missing root warning (@jonludlam, #881)

Oops, we went looking but didn't find the changelog for this release 🙈

• merlin binary
  • Replace custom "holes" AST nodes by extensions. This restores binary compatibility and fixes issues with PPXs when using typed-holes. (#1503)
  • Do not change temporarily Merlin's cwd when starting a PPX (#1521, fixes #1420)
  • Fix a parsing issue when declaring the (??) custom prefix operator. (#1507, fixes #1506)
  • Fix variant constructors' comments grouping (#1516, @mheiber, fixes #1513)
  • Filter-out duplicates from the enclosing command result (#1512)
  • Add a new verbosity=smart mode for type enclosing that only expand modules' types (#1374, @ulugbekna)
  • Improve locate for labels' declarations in the current buffer. (#1505, fixes #1524)
  • Fix locate on module without implementation (#1522, fixes #1519)
  • Allow program name customization when merlin is used as a library. (#1532)
• editor modes
  • vim: load the plugin when necessary if it wasn't loaded before (#1511)
  • emacs: xref works from context menus; better highlighting of xref matches; xref recognises operators and binding operators at the cursor position; bad locations are filtered out (#1385, fixes #1410)
  • emacs: update CI for newer releases and fix some warnings (#1454, @mattiase)
• test suite
  • Add tests for constructors' documentation (#1511)
  • Add test cases for label comment documentation (#1526, @mheiber)
  • Add a test for the enclosing command (#1512)
  • Add tests for interactions between locate and record labels (#1505)
  • Add test showing an issue with locate and implicit transitive deps

• Fix status line enabled when ANSI colors are forced. (#6503, @MisterDA)

• Fix build with MSVC compiler (#6517, @nojb)

• Do not shadow library interface modules (#6549, fixes #6545, @rgrinberg)

dune executable

This lists features of the “dune” executable itself. Upgrading dune will bring in these changes. We consider these changes safe, but it is difficult to define what a breaking change is for a command-line tool (for example, some error messages change). It is important to note that just upgrading the dune executable is not supposed to change how dune interprets existing projects. If just upgrading dune breaks compilation, it is a bug in dune, please report it!

Added

• Introduce a $ dune ocaml top-module subcommand to load modules directly without sealing them behind the signature. (#5940, @rgrinberg)
• Revive $ dune external-lib-deps under $ dune describe external-lib-deps. (#6045, @moyodiallo)
• Extend the promotion CLI to a dune promotion group: dune promote is moved to dune promotion apply (the former still works) and the new dune promotion diff command can be used to just display the promotion without applying it. (#6160, fixes #5368, @emillon)
• Build progress status now shows number of failed jobs (#6242, @Alizter)
• Allow promoting into source directories specified by subdir (#6404, fixes #3502, @rgrinberg)
• Support CLICOLOR and CLICOLOR_FORCE to enable/disable/force ANSI colors. (#6340, fixes #6323, @MisterDA).
• Create a fake socket file _build/.rpc/dune on windows to allow rpc clients to connect using the build directory. (#6329, @rgrinberg)

Fixed

• Forbid multiple instances of dune running concurrently in the same workspace. (#6360, fixes #236, @rgrinberg)
• Make dune describe workspace return the correct root path (#6380, fixes #6379, @esope)
• Fix running inline tests in bytecode mode (#5622, fixes #5515, @dariusf)

(lang dune 3.6)

This lists changes if you opt into the new (lang dune 3.6) version in your dune-project file. For this too, these are changes that we consider safe, but they can require changes to your dune files. For example, sandboxing is enabled in more places, which means that you might have to be more precise in expressing your dependencies. Please reach out on the issue tracker if you have trouble fixing your dune file or if something does not seem to be possible anymore.

Added

• Add (glob_files <glob>) and (glob_files_rec <glob>) terms to the files field of the install stanza (#6250, closes #6018, @gridbugs)
• Allow Byte_complete binaries to be installable (#4837, @AltGr, @rgrinberg)
• Allow :standard in the (modules) field of the coq.pp stanza (#6229, fixes #2414, @Alizter)

Fixed

• Allow absolute build directories to find public executables. For example, those specified with (deps %{bin:...}) (#6326, @anmonteiro)
• [ctypes] do not mangle user written names in the ctypes stanza (#6374, fixes #5561, @rgrinberg)
• Forbid private libraries with (package ..) set from depending on private libraries that don't belong to a package (#6385, fixes #6153, @rgrinberg)
• [ctypes] always re-run pkg-config because we aren't tracking its external dependencies (#6052, @rgrinberg)
• [ctypes] remove dependency on configurator in the generated rules (#6052, @rgrinberg)
• Fix passing of flags to dune coq top (#6369, fixes #6366, @Alizter)
• Prevent crash if absolute paths are used in the install stanza and in recursive globs. These cases now result in a user error. (#6331, @gridbugs)

Fixes

• Fix random requests failing after switching documents (#904, fixes #898)

• Do not offer related diagnostic information unless the user enables in client capabilities (#905)

• Do not offer diagnostic tags unless the client supports them (#909)

• Do not attach extra data to diagnostics unless the client supports this (#910)

• Use /bin/sh instead of /bin/bash. This fixes ocamllsp on NixOS

Fixes

• Fix various server crashes when opening non OCaml/Reason files. Files such as dune, cram, etc. would cause the server to crash. (#884, fixes #871)

• Ignore unknown tags in merlin configuration to improve forward compatibility with Dune. (#883)

dune executable

This lists features of the "dune" executable itself. Upgrading dune will bring in these changes. We consider these changes safe, but it is difficult to define what a breaking change is for a command-line tool (for example, some error messages change). It is important to note that just upgrading the dune executable is not supposed to change how dune interprets existing projects. If just upgrading dune breaks compilation, it is a bug in dune, please report it!

Added

• Allow dune describe workspace to accept directories as arguments. The provided directories restrict the worskpace description to those directories. (#6107, fixes #3893, @esope)
• Add a terminal persistence mode that attempts to clear the terminal history. It is enabled by setting terminal persistence to clear-on-rebuild-and-flush-history (#6065, @rgrinberg)

Fixed

• Fix build-info version when used with flambda (#6089, fixes #6075, @jberdine)
• Fix compilation of Dune under esy on Windows (#6109, fixes #6098, @nojb)
• Improve error message when parsing several licenses in (license) (#6114, fixes #6103, @emillon)
• Handle CSI n K code in ANSI escape codes from commands. (#6214, fixes #5528, @emillon)
• Do not ignore rules marked (promote (until-clean)) when --ignore-promoted-rules (or -p) is passed. (#6010, fixes #4401, @emillon)

Changed

• dune install: copy files in an atomic way (#6150, @emillon)
• update vendored copy of cmdliner to 1.1.1. This improves the built-in documentation for command groups such as dune ocaml. (#6038, @emillon, #6169, @shonfeder)
• Extend dune describe to include the root path of the workspace and the relative path to the build directory. (#6136, @reubenrowe)

macOS support

This is technically a subset of above section. For M1 mac users, dune 3.5.0 is the first version which will correctly support dune-build-info.

Added

• on macOS, sign executables produced by artifact substitution (#6137, #6231, fixes #5650, fixes #6226, @emillon)
• Enable file watching on MacOS SDK < 10.13. (#6218, @rgrinberg)

Fixed

• macOS: Handle unknown fsevents without crashing (#6217, @rgrinberg)

(lang dune 3.5)

This lists changes if you opt into the new (lang dune 3.5) version in your dune-project file. For this too, these are changes that we consider safe, but they can require changes to your dune files. For example, sandboxing is enabled in more places, which means that you might have to be more precise in expressing your dependencies. Please reach out on the issue tracker if you have trouble fixing your dune file or if something does not seem to be possible anymore.

Added

• Add a runtime_deps field in the cinaps stanza to specify runtime dependencies for running the cinaps preprocessing action (#6175, @rgrinberg)
• Allow rules producing directory targets to be not sandboxed (#6056, @rgrinberg)
• Introduce a dirs field in the install stanza to install entire directories (#5097, fixes #5059, @rgrinberg)
• Add an (include <file>) term to the include_dirs field for adding directories to the include paths sourced from a file. (#6058, fixes #3993, @gridbugs)
• Support (extra_objects ...) field in (executable ...) and (library ...) stanzas (#6084, fixes #4129, @gridbugs)
• Allow rules producing directory targets to create symlinks (#6077, fixes #5945, @rgrinberg)
• Added an (aliases ...) field to the (rules ...) stanza which allows the specification of multiple aliases per rule (#6194, @Alizter)
• Allow include statement in install stanza (#6139, fixes #256, @gridbugs)
• Add a new experimental feature mode_specific_stubs that allows the specification of different flags and sources for foreign stubs depending on the build mode (#5649, @voodoos)

Changed

• Sandbox running cinaps actions starting from cinaps 1.1 (#6176, @rgrinberg)
• Cinaps actions are now sandboxed by default (#6062, @rgrinberg)
• Menhir rules are now sandboxed by default (#6076, @rgrinberg)
• Inline tests are now sandboxed by default (#6079, @rgrinberg)

Fixed

• Shadow alias module Foo__ when building a library Foo (#6126, @rgrinberg)
• Disallow generating targets in sub direcories in inferred rules. The check to forbid this was accidentally done only for manually specified targets (#6031, @rgrinberg)
• odoc rules now about ODOC_SYNTAX and will rerun accordingly (#6010, fixes #1117, @emillon)

Coq support

These changes, associated with (lang dune 3.5), are specific to coq.

Added

• Add %{coq:...} macro for accessing data about the configuration about Coq. For instance %{coq:version} (#6049, @Alizter)
• Starting with Coq build language 0.6, theories can be built without importing Coq's standard library by including (stdlib no). (#6165 #6164, fixes #6163, @ejgallego @Alizter @LasseBlaauwbroek)

Changed

• Dune no longer considers .aux files as targets during Coq compilation. This means that .aux files are no longer cached. (#6024, fixes #6004, @alizter)
• The test suite for Coq now requires Coq >= 8.16 due to changes in the plugin loading mechanism upstream (which now uses Findlib).
• The (coq.theory ...) stanza will now ensure that for each declared (plugin ...), the META file for it is built before calling coqdep. This enables the use of the new Findlib-based loading method in Coq 8.16; however as of Coq 8.16.0, Coq itself has some bugs preventing this to work yet. (#6167 , workarounds #5767, @ejgallego)

Features

• Code action for inlining let bindings within a module or expression. (#847)

• Tag "unused code" and "deprecated" warnings, allowing clients to better display them. (#848)

• Refresh merlin configuration after every dune build in watch mode (#853)

Fixes

• Respect showDocument capabilities. Do not offer commands or code actions that rely on this request without client support. (#836)

• Fix signatureHelp on .mll files: avoid "Document.dune" exceptions

• Make esequence right-associative. (#366, @ceastlund)
• Deprecate unused attributes in Deriving.Generator (#368, @sim642)
• Remove a pattern match on mutable state in a function argument. (#362, @ceastlund)
• Add code-path manipulation attributes. (#352, @ceastlund)
• Update context-free rules to collect expansion errors generated by ppxlib and propagate them to top level without failing. (#358 and #361, @ceastlund)
• Add driver benchmarks (#376, @gridbugs)

Fixes

• Fix cwd when executing ppx (#805)

Features

• Code actions for jumping to related files (.ml, .mli, etc.) (#795)

• Fix build on cygwin/i686-w64-mingw32 (#6008, @kit-ty-kate)

• Make dune describe correctly handle overlapping implementations for virtual libraries (#5971, fixes #5747, @esope)

• Building the @check alias should make sure the libraries and executables don't have dependency cycles (#5892, @rgrinberg)

• [ctypes] Add support for the errno parameter using the errno_policy field in the ctypes settings. (#5827, @droyo)

• Fix dune coq top when it is invoked on files from a subdirectory of the directory containing the associated stanza (#5784, fixes #5552, @ejgallego, @rlepigre, @Alizter)

• Fix hint when an invalid module name is found. (#5922, fixes #5273, @emillon)

• The (cat) action now supports several files. (#5928, fixes #5795, @emillon)

• Dune no longer uses shimmed META files for OCaml 5.x, solely using the ones installed by the compiler. (#5916, @dra27)

• Fix handling of the (deps) field in (test) stanzas when there is an .expected file. (#5952, #5951, fixes #5950, @emillon)

• Ignore insignificant filesystem events. This stops RPC in watch mode from flashing errors on insignificant file system events such as changes in the .git/ directory. (#5953, @rgrinberg)

• Fix parsing more error messages emitted by the OCaml compiler. In particular, messages where the excerpt line number started with a blank character were skipped. (#5981, @rgrinberg)

• env stanza: warn if some rules are ignored because they appear after a wildcard rule. (#5898, fixes #5886, @emillon)

• On Windows, XDG_CACHE_HOME is taken to be the FOLDERID_InternetCache if unset, and XDG_CONFIG_HOME and XDG_DATA_HOME are both taken to be FOLDERID_LocalAppData if unset. (#5943, fixes #5808, @nojb)

New features

• Support odoc-parser.2.0.0 (#2123, @gpetiot)
  • Breaking change: incompatible with earlier versions of odoc-parser
  • New inline math elements {m ...} available in doc-comments
  • New block math elements {math ...} available in doc-comments

• Allow cancellation of workspace symbols requests (#777)

• Fix unintentionally interleaved jsonrpc IO that would corrupt the session (#786)

• Ignore SIGPIPE . (#788)

Fixes

• Fix a bad interaction between inferred interfaces and promotion code actions in watch mode (#753)

• Fix URI parsing (#739 fixes #471 and #459)

Removed

• bench binary is not distributed anymore to avoid name collisions (#2104, @gpetiot)

Bug fixes

• Preserve comments around object open/close flag (#2097, @trefis, @gpetiot)
• Preserve comments around private/mutable/virtual keywords (#2098, @trefis, @gpetiot)
• Closing parentheses of local open now comply with indicate-multiline-delimiters (#2116, @gpetiot)
• emacs: fix byte-compile warnings (#2119, @syohex)

Changes

• Use the API of ocp-indent to parse the .ocp-indent files (#2103, @gpetiot)
• JaneStreet profile: set max-indent = 2 (#2099, @gpetiot)
• JaneStreet profile: align pattern-matching bar | under keyword instead of parenthesis (#2102, @gpetiot)

Oops, we went looking but didn't find the changelog for this release 🙈

• Use dependencies compatible with OCaml 5:
  • Use zed 3.2.0, based on uucp, uutf, and uuseg instead of camomile
  • Use logs.lwt instead of lwt_logs

Additions

• New subcommand to resolve references (@panglesd, @lubegasimon, #812)
• Improved rendering of long signatures (@panglesd, #782)
• Handle comments attached to open statement as floating comment, instead of dropping them (@panglesd, #797)
• Empty includes (containing entirely shadowed entries) are now hidden (@panglesd, #798)

Bugs fixed

• Fix a missing Result constructor during compile. This will cause some functor arguments to have different filenames (@jonludlam, #795)
• Better memory/disk space usage when handling module alias chains (@jonludlam, #799)
• Resolving class-type paths (ie., val x : #c) (@jonludlam, #809)
• Skip top-level attributes while extracting the top comment. Fix top-comment extraction with PPX preprocessing (@jorisgio, #819)
• Better handling of @canonical tags (@jonludlam, #820)
• css: improved layout (@jonludlam, @Julow, #822)

• merlin binary
  • make most library public and split merlin in two packages: the merlin-lib package that exposes merlin's internals and the merlin package with the frontend. (#1448, #1455, #1457, #1497, @rgrinberg, @tmattio, @kit-ty-kate)
  • Type printing: use best_module_path for paths from Mty_alias (#1470)
  • Attempt at finding the 'real' capitalization of files on windows (#1462 by @mlasson)
  • Use newer Seq-based API of Yojson 2.0, avoiding the need for the deprecated Stream module (#1475 by @Leonidas-from-XIV)
  • unify parsing of MERLIN_LOG (#1480 by @ulugbekna)
  • Fix type deduplication in type-enclosing results (#1483, fixes #1477)
  • Only weakly reduce the shapes to speed up the new Merlin locate implementation. (#1488)
  • Ignore unknown configuration tags from dune configuration provider but not from dot-merlin-reader (#1486)
  • typing recovery: recover at the granularity of core_type (#1484)
• editor modes
  • add method imenu items for emacs (#1481, @mndrix)
  • emacs: Make the prefix argument to merlin-locate optional, both for consistency with Emacs convention and for backwards compatibility. (#1476, @antalsz)
  • emacs: fix duplicated prefix path in imenu entries (#1495, @bcc32)

Fixes

• Fix shutting down an already closed socket (#740)

Fixes

• Fix preprocessing, ppx, and reason support (#735 fixes #696, #706)

• Support include in folding ranges (#730)

Features

• Fix cancellation mechanism for all requests (#707)

• Allow cancellation of formatting requests (#707)

• Add --fallback-read-dot-merlin to the LSP Server (#705). If ocamllsp is started with this new flag, it will fall back to looking for Merlin configuration in .merlin files rather than calling dune ocaml-merlin. (#705)

• Support folding more ranges (#692)

• Improve parsing of ocamlc errors. We now correctly strip excerpts and parse alerts (#5879, @rgrinberg)

• The (libraries) field of the coq.theory stanza has been renamed to (plugins) and the Coq language version has been bumped to 0.5.

• Add support for OCaml 5.0 (#377 @dra27)

• Update expansion context to leave out value name when multiple are defined at once. (#351, @ceastlund)
• Add support for OCaml 5.0 (#348, @pitag-ha)
• Add Code_path.enclosing_value (#349, @ceastlund)
• Add Code_path.enclosing_module (#346, @ceastlund)
• Expand code generated by ~enclose_intf and ~enclose_impl (#345, @ceastlund)
• Add type annotations to code generated by metaquot (#344, @ceastlund)
• Fix typo in description field of dune-project (#343, @ceastlund)
• Fix Ast_pattern.many (#333, @nojb)
• Fix quoter and optimize identifier quoting (#327, @sim642)
• Driver, when run with --check: Allow toplevel_printer attributes (#340, @pitag-ha)
• Documentation: Add a section on reporting errors by embedding extension nodes in the AST (#318, @panglesd)
• Driver: In the case of ppxlib internal errors, embed those errors instead of raising to return a meaningful AST (#329, @panglesd)
• API: For each function that could raise a located error, add a function that return a result instead (#329, @panglesd)

• Add support for 5.0 (#122, @pitag-ha)

• Sandbox preprocessing, lint, and dialect rules by default. All these rules now require precise dependency specifications (#5807, @rgrinberg)

• Allow list expansion in the pps specification for preprocessing (#5820, @Firobe)

• Add warnings 67-69 to dune's default set of warnings. These are warnings of the form "unused X.." (#5844, @rgrinberg)

• Introduce project "composition" for coq theories. Coq theories in separate projects can now refer to each other when in the same workspace (#5784, @Alizter, @rgrinberg)

• Fix hint message for data_only_dirs that wrongly mentions the unknown constructor data_only (#5803, @lambdaxdotx)

• Fix creating sandbox directory trees by getting rid of buggy memoization (#5794, @rgrinberg, @snowleopard)

• Handle directory dependencies in sandboxed rules. Previously, the parents of these directory dependencies weren't created. (#5754, @rgrinberg)

• Set the exit code to 130 when dune is terminated with a signal (#5769, fixes #5757)

• Support new locations of unix, str, dynlink in OCaml >= 5.0 (#5582, @dra27)

• The coq.theory stanza now produces rules for running coqdoc. Given a theory named mytheory, the directory targets mytheory.html/ and mytheory.tex/ or additionally the aliases @doc and @doc-latex will build the HTML and LaTeX documentation repsectively. (#5695, fixes #3760, @Alizter)

• Coq theories marked as (boot) cannot depend on other theories (#5867, @ejgallego)

• Ignore bigarray in (libraries) with OCaml >= 5.0. (#5526, fixes #5494, @moyodiallo)

• Start with :standard when building the ctypes generated foreign stubs so that we include important compiler flags, such as -fPIC (#5816, fixes #5809).

• Bump ppxlib's AST to 4.14/5.00 (#320, @pitag-ha)

Removed

• Profiles compact and sparse are now removed (#2075, @gpetiot)
• Options align-cases, align-constructors-decl and align-variants-decl are now removed (#2076, @gpetiot)
• Option disable-outside-detected-project is now removed (#2077, @gpetiot)

Deprecated

• Cancel the deprecations of options that are not set by the preset profiles (#2074, @gpetiot)

Bug fixes

• emacs: Remove temp files in the event of an error (#2003, @gpetiot)
• Fix unstable comment formatting around prefix op (#2046, @gpetiot)

Changes

• Qtest comments are not re-formatted (#2034, @gpetiot)
• ocamlformat-rpc is now distributed through the ocamlformat package (#2035, @Julow)
• Doc-comments code blocks with a language other than 'ocaml' (set in metadata) are not parsed as OCaml (#2037, @gpetiot)
• More comprehensible error message in case of version mismatch (#2042, @gpetiot)
• The global configuration file ($XDG_CONFIG_HOME or $HOME/.config) is only applied when no project is detected, --enable-outside-detected-project is set, and no applicable .ocamlformat file has been found. Global and local configurations are no longer used at the same time. (#2039, @gpetiot)
• Set ocaml-version to a fixed version (4.04.0) by default to avoid reproducibility issues and surprising behaviours (#2064, @kit-ty-kate)
• Split option --numeric=X-Y into --range=X-Y and --numeric (flag). For now --range can only be used with --numeric. (#2073, #2082, @gpetiot)

New features

• New syntax (*= ... *) for verbatim comments (#2028, @gpetiot)
• Preserve the begin-end construction in the AST (#1785, @hhugo, @gpetiot)
• Preserve position of comments located after the semi-colon of the last element of lists/arrays/records (#2032, @gpetiot)
• Option --print-config displays a warning when an .ocamlformat file defines redundant options (already defined by a profile) (#2084, @gpetiot)

Fixed

• Fix project name detection from dune-project. The parser could get confused when opam file generation is used. Now it only considers the first (name X) in the file. (#445, #446, @emillon)

Fixes

• Stop leaking file descriptors like a sieve (#701)

• Fixed dune describe workspace --with-deps so that it correctly handles Reason files, as well as files any other dialect. (#5701, @esope)

• Disable alerts when compiling code in vendored directories (#5683, @NathanReb)

• Fixed dune describe --with-deps, that crashed when some preprocessing was required in a dune file using per_module. (#5682, fixes #5680, @esope)

• Add $ dune describe pp to print the preprocssed ast of sources. (#5615, fixes #4470, @cannorin)

• Report dune file evaluation errors concurrently. In the same way we report build errors. (#5655, @rgrinberg)

• Watch mode now default to clearing the terminal on rebuild (#5636, fixes, #5216, @rgrinberg)

• The output of jobs that finished but were cancelled is now omitted. (#5631, fixes #5482, @rgrinberg)

• Allows to configure all the default destination directories with ./configure (adds bin, sbin, data, libexec). Use OPAM_SWITCH_PREFIX instead of calling the opam binaries in dune install. Fix handling of multiple libdir in ./configure for handling /usr/lib/ocaml/ and /usr/local/lib/ocaml. In dune install forbid relative directories in libdir, docdir and others specific directory setting because their handling was inconsistent (#5516, fixes #3978 and #5455, @bobot)

• --terminal-persistence=clear-on-rebuild will no longer destroy scrollback on some terminals (#5646, @rgrinberg)

• Add a fmt command as a shortcut of dune build @fmt --auto-promote (#5574, @tmattio)

• Watch mode now tracks copied external files, external directories for dependencies, dune files in OCaml syntax, files used by include stanzas, dune-project, opam files, libraries builtin with compiler, and foreign sources (#5627, #5645, #5652, #5656, #5672, #5691, #5722, fixes #5331, @rgrinberg)

• Improve metrics for cram tests. Include test names in the event and add a category for cram tests (#5626, @rgrinberg)

• Allow specifying multiple licenses in project file (#5579, fixes #5574, @liyishuai)

• Match glob_files only against files in external directories (#5614, fixes #5540, @rgrinberg)

• Add pid's to chrome trace output (#5617, @rgrinberg)

• Fix race when creating local cache directory (#5613, fixes #5461, @rgrinberg)

• Add not to boolean expressions (#5610, fix #5503, @rgrinberg)

• Fix relative dependencies outside the workspace (#4035, fixes #5572, @bobot)

• Allow to specify --prefix via the environment variable DUNE_INSTALL_PREFIX (#5589, @vapourismo)

• Dune-site.plugin: add support for archive(native|byte, plugin) used in the wild before findlib documented plugin(native|byte) in 2015 (#5518, @bobot)

• Fix a bug where Dune would not correctly interpret META files in alternative layout (ie when the META file is named META.$pkg). The Llvm bindings were affected by this issue. (#5619, fixes #5616, @nojb)

• Support (binaries) in (env) in dune-workspace files (#5560, fix #5555, @emillon)

• (mdx) stanza: add support for (locks). (#5628, fixes #5489, @emillon)

• (mdx) stanza: support including files in different directories using relative paths, and provide better error messages when paths are invalid (#5703, #5704, fixes #5596, @emillon)

• Fix ctypes rules for external lib names which aren't valid ocaml names (#5667, fixes #5511, @Khady)

• Fix process termination. Once the lsp server is stepped, the process will gracefully terminate (#697, fixes #694)

• Forward stderr from dune's merlin configuration to the lsp server's stderr (#697)

• Fix bug with large buffers being resized incorrectly in Lev

• Add folding ranges for more AST types (#680)

Fixes

• Enable dune rpc integration by default (#691, fixes #690)