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Next version (4.05.0):
----------------------
(Changes that can break existing programs are marked with a "*")
### Language features:
### Code generation and optimizations:
- GPR#504: Instrumentation support for fuzzing with afl-fuzz.
(Stephen Dolan, review by Alain Frisch, Pierre Chambart, Mark
Shinwell, Gabriel Scherer and Damien Doligez)
- MPR#7201, GPR#954: Correct wrong optimisation of "0 / <expr>"
and "0 mod <expr>" in the case when <expr> was a non-constant
evaluating to zero (Mark Shinwell)
### Runtime system:
- PR#7423, GPR#946: expose new exception-raising functions
`void caml_{failwith,invalid_argument}_value(value msg)`
in addition to
`void caml_{failwith,invalid_argument}(char const *msg)`.
The previous functions would not free their message argument, so
were inconvient for dynamically-allocated messages; the messages
passed to the new functions are handled by the garbage collector.
(Gabriel Scherer, review by Mark Shinwell, request by Immanuel Litzroth)
- GPR#891: Use -fno-builtin-memcmp when building runtime with gcc.
(Leo White)
### Type system:
- PR#6608, GPR#901: unify record types when overriding all fields
(Tadeu Zagallo and Gabriel Scherer, report by Jeremy Yallop,
review by David Allsopp, Jacques Garrigue)
### Compiler user-interface and warnings:
- PR#7473, GPR#1025: perform proper globbing for command-line arguments on
Windows
(Jonathan Protzenko)
- PR#7315, GPR#736: refine some error locations
(Gabriel Scherer and Alain Frisch, report by Matej Košík)
- PR#7050, GPR#748 GPR#843 GPR#864: new `-args/-args0 <file>` parameters to
provide extra command-line arguments in a file -- see documentation.
User programs may implement similar options using the new `Expand`
constructor of the `Arg` module.
(Bernhard Schommer, review by Jérémie Dimino, Gabriel Scherer
and Damien Doligez, discussion with Alain Frisch and Xavier Leroy,
feature request from the Coq team)
- PR#7172, GPR#970: add extra (ocamlc -config) options
int_size, word_size, ext_exe
(Gabriel Scherer, request by Daniel Buenzli)
- GPR#829: better error when opening a module aliased to a functor
(Alain Frisch)
- GPR#911: ocamlc/ocamlopt do not pass warnings-related options to C
compiler when called to compile third-party C source files
(Sébastien Hinderer)
* GPR#933: ocamlopt -p now reports an error on platforms that do not
support profiling with gprof; dummy profiling libraries are no longer
installed on such platforms.
This can be tested with ocamlopt -config
(Sébastien Hinderer)
- PR#7137, GPR#960: "-open" command line flag now accepts a module path
(not a module name) (Arseniy Alekseyev and Leo White)
- GPR#1009: "ocamlc -c -linkall" and "ocamlopt -c -linkall" can now be used
to set the "always link" flag on individual compilation units. This
controls linking with finer granularity than "-a -linkall", which sets
the "always link" flag on all units of the given library.
(Xavier Leroy)
- GPR#796: allow compiler plugins to declare their own arguments.
(Fabrice Le Fessant)
### Standard library:
- PR#6975, GPR#902: Truncate function added to stdlib Buffer module
(Dhruv Makwana, review by Alain Frisch and Gabriel Scherer)
- GPR#760: Add a functions List.compare_lengths and
List.compare_length_with to avoid full list length computations
(Fabrice Le Fessant)
- GPR#778: Arg: added option Expand that allows to expand a string
argument to a string array of new arguments
(Bernhard Schommer)
- GPR#849: Exposed Spacetime.enabled value
(Leo White)
- GPR#885: Option-returning variants of stdlib functions
(Alain Frisch, review by David Allsopp and Bart Jacobs)
- GPR#869: Add find_first, find_first_opt, find_last, find_last_opt to
maps and sets. Find the first or last binding or element
satisfying a monotonic predicate.
(Gabriel de Perthuis, with contributions from Alain Frisch, review by
Hezekiah M. Carty and Simon Cruanes, initial report by Gerd Stolpmann)
- Add missing functions to ArrayLabels, BytesLabels, ListLabels,
MoreLabels, StringLabels so they are compatible with non-labeled
counterparts.
(Roma Sokolov)
- GPR#999: Arg, do not repeat thrice usage_msg when reporting an error
(Florian Angeletti, review by Gabriel Scherer)
### Manual and documentation:
- PR#6597, GPR#1030: add forward references to language extensions
that extend non-terminal symbols in the language reference section.
(Florian Angeletti, review by Gabriel Scherer)
- GPR#939: activate the caml_example environment in the language
extensions section of the manual. Convert some existing code
examples to this format.
(Florian Angeletti)
- add a HACKING.adoc file to contain various tips and tricks for
people hacking on the repository. See also CONTRIBUTING.md for
advice on sending contributions upstream.
(Gabriel Scherer and Gabriel Radanne, review by David Allsopp,
inspired by John Whitington)
### Other libraries:
- GPR#650: in the Unix library, add `?cloexec:bool` optional arguments to
functions that create file descriptors (`dup`, `dup2`, `pipe`, `socket`,
`socketpair`, `accept`). Implement these optional arguments in the
most atomic manner provided by the operating system to set (or clear)
the close-on-exec flag at the same time the file descriptor is created,
reducing the risk of race conditions with `exec` or `create_process`
calls running in other threads, and improving security. Also: add a
`O_KEEPEXEC` flag for `openfile` by symmetry with `O_CLOEXEC`.
(Xavier Leroy)
- MPR#7339, GPR#787: Support the '0 dimension' case for bigarrays
(see Bigarray documentation)
(Laurent Mazare,
review by Gabriel Scherer, Alain Frisch and Hezekiah M. Carty)
* PR#7342, GPR#797: fix Unix.read on pipes with no data left on Windows
it previously raised an EPIPE error, it now returns 0 like other OSes
(Jonathan Protzenko)
- PR#7457: a case of double free in the systhreads library (POSIX implementation)
(Xavier Leroy, report by Chet Murthy)
- GPR#997: Deprecate Bigarray.*.map_file and add Unix.map_file as a
first step towards moving Bigarray to the stdlib
(Jeremie Dimino)
- GPR#996: correctly update caml_top_of_stack in systhreads
(Fabrice Le Fessant)
### Bytecode debugger (ocamldebug):
- GPR#977: Catch Out_of_range in "list" command
(Yunxing Dai)
### Tools:
- PR#5163: ocamlobjinfo, dump globals defined by bytecode executables
(Stéphane Glondu)
- PR#7333: ocamldoc, use the first sentence of text file as
a short description in overviews.
(Florian Angeletti)
- GPR#848: ocamldoc, escape link targets in HTML output
(Etienne Millon, review by Gabriel Scherer, Florian Angeletti and
Daniel Bünzli)
- GPR#986: ocamldoc, use relative paths in error message
to solve ocamlbuild+doc usability issue (ocaml/ocamlbuild#79)
(Gabriel Scherer, review by Florian Angeletti, discussion with Daniel Bünzli)
- GPR#1017: ocamldoc, add an option to detect code fragments that could be
transformed into a cross-reference to a known element.
(Florian Angeletti, review and suggestion by David Allsopp)
- clarify ocamldoc text parsing error messages
(Gabriel Scherer)
### Compiler distribution build system:
- GPR#887: allow -with-frame-pointers if clang is used as compiler on Linux
(Bernhard Schommer)
- GPR#919: use clang as preprocessor assembler if clang is used as compiler
(Bernhard Schommer)
- GPR#927: improve the detection of hashbang support in the configure script
(Armaël Guéneau)
- PR#7377: remove -std=gnu99 for newer gcc versions
(Damien Doligez, report by ygrek)
- GPR#693: fail on unexpected errors or warnings within caml_example
environment.
(Florian Angeletti)
- GPR#729: Make sure ocamlnat is built with a $(EXE) extension, merge
rules between Unix and Windows Makefiles
(Sébastien Hinderer, review by Alain Frisch)
- GPR#762, GPR#764: Merge Unix and Windows Makefiles in yacc/ and
debugger/
(Sébastien Hinderer)
- GPR#827: install missing mli and cmti files, new make target
install-compiler-sources for installation of compiler-libs ml files
(Hendrik Tews)
- GPR#898: fix locale-dependence of primitive list order,
detected through reproducible-builds.org.
(Hannes Mehnert, review by Gabriel Scherer and Ximin Luo)
- GPR#932: install ocaml{c,lex}->ocaml{c,lex}.byte symlink correctly
when the opt target is built but opt.opt target is not.
(whitequark)
- GPR#935: allow build in Android's termux
(ygrek, review by Gabriel Scherer)
- GPR#984: Fix compilation of compiler distribution when Spacetime
enabled
(Mark Shinwell)
- GPR#991: On Windows, fix installation when native compiler is not
built
(Sébastien Hinderer, review by David Allsopp)
- GPR#803: new ocamllex-based tool to extract bytecode compiler
opcode information from C headers.
(Nicolas Ojeda Bar)
### Internal/compiler-libs changes:
- GPR#673: distinguish initialization of block fields from mutation in lambda.
(Frédéric Bour, review by Xavier Leroy, Stephen Dolan and Mark Shinwell)
- GPR#744, GPR#781: fix duplicate self-reference in imported cmi_crcs
list in .cmti files + avoid rebuilding cmi_info record when creating
.cmti files
(Alain Frisch, report by Daniel Bunzli, review by Jeremie Dimino)
- GPR#915: fix -dsource (pprintast.ml) bugs
(Runhang Li, review by Alain Frisch)
- GPR#832, MPR#7357: Improve compilation time for toplevel
include(struct ... end : sig ... end)
(Alain Frisch, report by Hongbo Zhang, review by Jacques Garrigue)
- GPR#881: change `Outcometree.out_variant` to be more general.
`Ovar_name of out_ident * out_type list` becomes `Ovar_type of out_type`.
(Valentin Gatien-Baron)
- GPR#908: refactor PIC-handling in the s390x backend
(Gabriel Scherer)
- GPR#1027: various improvements to -dtimings, mostly including time
spent in subprocesses like preprocessors
(Valentin Gatien-Baron, review by Gabriel Scherer)
### Bug fixes
- PR#5115: protect all byterun/fail.c functions against
uninitialized caml_global_data (only changes the bytecode behavior)
(Gabriel Scherer, review by Xavier Leroy)
- PR#6903: Unix.execvpe doesn't change environment on Cygwin
(Xavier Leroy)
- PR#7216, GPR#949: don't require double parens in Functor((val x))
(Jacques Garrigue, review by Valentin Gatien-Baron)
- PR#7414, GPR#929: Soundness bug with non-generalized type variable and functor
(Jacques Garrigue, report by Leo White)
- PR#7421: Soundness bug with GADTs and lazy
(Jacques Garrigue, report by Leo White)
- PR#7424: Typechecker diverges on unboxed type declaration
(Jacques Garrigue, report by Stephen Dolan)
- PR#7432: Linking modules compiled with -labels and -nolabels is not safe
(Jacques Garrigue, report by Jeremy Yallop)
- PR#7437: typing assert failure with nonrec priv
(Jacques Garrigue, report by Anil Madhavapeddy)
- PR#7443, GPR#990: spurious unused open warning with local open in patterns
(Florian Angeletti, report by Gabriel Scherer)
- GPR#795: remove 256-character limitation on Sys.executable_name
(Xavier Leroy)
- GPR#805, GPR#815, GPR#833: check for integer overflow in String.concat
(Jeremy Yallop,
review by Damien Doligez, Alain Frisch, Daniel Bünzli, Fabrice Le Fessant)
- GPR#810: check for integer overflow in Array.concat
(Jeremy Yallop)
- GPR#814: fix the Buffer.add_substring bounds check to handle overflow
(Jeremy Yallop)
- GPR#881: short-paths did not apply to some polymorphic variants
(Valentin Gatien-Baron, review by Leo White)
- GPR#934: check for integer overflow in Bytes.extend
(Jeremy Yallop, review by Gabriel Scherer)
- MPR#6594, GPR#955: Remove "Istore_symbol" specific operation on x86-64.
This is more robust and in particular avoids assembly failures on Win64.
(Mark Shinwell, review by Xavier Leroy, testing by David Allsopp and
Olivier Andrieu)
- GPR#956 Keep possibly-effectful expressions when optimizing multiplication
by zero.
(Jeremy Yallop)
- PR#7427, GPR#959: Don't delete let bodies in Cmmgen (Mark Shinwell)
- GPR#967, PR#6136: Fix Closure so that overapplication evaluation order
matches the bytecode compiler and Flambda.
(Mark Shinwell, report by Jeremy Yallop, review by Frédéric Bour)
- GPR#983: Avoid removing effectful expressions in Closure, and
eliminate more non-effectful ones
(Alain Frisch, review by Mark Shinwell and Gabriel Scherer)
- GPR#987: alloc_sockaddr: don't assume a null terminator. It is not inserted
on macOS by system calls that fill in a struct sockaddr (e.g. getsockname).
(Anton Bachin)
### Toplevel and debugger:
- PR#7060, GPR#1035: Print exceptions in installed custom printers
(Tadeu Zagallo, review by David Allsopp)
Next minor version (4.04.1):
----------------------------
### Standard library:
- PR#7403, GPR#894: fix a bug in Set.map as introduced in 4.04.0
(Gabriel Scherer, report by Thomas Leonard)
### Bug fixes
- PR#7405, GPR#903: s390x: Fix address of caml_raise_exn in native dynlink modules
(Richard Jones, review by Xavier Leroy)
- MPR#7417, GPR#930: ensure 16 byte stack alignment inside caml_allocN on x86-64
for ocaml build with WITH_FRAME_POINTERS defined
(Christoph Cullmann)
- PR#7460, GPR#1011: catch uncaught exception when unknown files are passed
as argument (regression in 4.04.0)
(Bernhard Schommer, review by Florian Angeletti and Gabriel Scherer,
report by Stephen Dolan)
- GPR#912: Fix segfault in Unix.create_process on Windows caused by wrong header
configuration.
(David Allsopp)
- GPR#980: add dynlink options to ocamlbytecomp.cmxa to allow ocamlopt.opt
to load plugins. See http://github.com/OCamlPro/ocamlc-plugins for examples.
(Fabrice Le Fessant, review by David Allsopp)
- GPR#992: caml-types.el: Fix missing format argument, so that it can show kind
of call at point correctly.
(Chunhui He)
OCaml 4.04.0 (4 Nov 2016):
--------------------------
(Changes that can break existing programs are marked with a "*")
### Language features:
- PR#7233: Support GADT equations on non-local abstract types
(Jacques Garrigue)
- GPR#187, GPR#578: Local opening of modules in a pattern.
Syntax: "M.(p)", "M.[p]","M.[| p |]", "M.{p}"
(Florian Angeletti, Jacques Garrigue, review by Alain Frisch)
- GPR#301: local exception declarations "let exception ... in"
(Alain Frisch)
- GPR#508: Allow shortcut for extension on semicolons: ;%foo
(Jeremie Dimino)
- GPR#606: optimized representation for immutable records with a single
field, and concrete types with a single constructor with a single argument.
This is triggered with a [@@unboxed] attribute on the type definition.
Currently mutually recursive datatypes are not well supported, this
limitation should be lifted in the future (see MPR#7364).
(Damien Doligez)
### Compiler user-interface and warnings:
* PR#6475, GPR#464: interpret all command-line options before compiling any
files, changes (improves) the semantics of repeated -o options or -o
combined with -c see the super-detailed commit message at
https://github.com/ocaml/ocaml/commit/da56cf6dfdc13c09905c2e07f1d4849c8346eec8
(whitequark)
- PR#7139: clarify the wording of Warning 38
(Unused exception or extension constructor)
(Gabriel Scherer)
* PR#7147, GPR#475: add colors when reporting errors generated by ppx rewriters.
Remove the `Location.errorf_prefixed` function which is no longer relevant
(Simon Cruanes, Jérémie Dimino)
- PR#7169, GPR#501: clarify the wording of Warning 8
(Non-exhaustivity warning for pattern matching)
(Florian Angeletti, review and report by Gabriel Scherer)
* GPR#591: Improve support for OCAMLPARAM: (i) do not use objects
files with -a, -pack, -shared; (ii) use "before" objects in the toplevel
(but not "after" objects); (iii) use -I dirs in the toplevel,
(iv) fix bug where -I dirs were ignored when using threads
(Marc Lasson, review by Damien Doligez and Alain Frisch)
- GPR#648: New -plugin option for ocamlc and ocamlopt, to dynamically extend
the compilers at runtime.
(Fabrice Le Fessant)
- GPR#684: Detect unused module declarations
(Alain Frisch)
- GPR#706: Add a settable Env.Persistent_signature.load function so
that cmi files can be loaded from other sources. This can be used to
create self-contained toplevels.
(Jérémie Dimino)
### Standard library:
- PR#6279, GPR#553: implement Set.map
(Gabriel Scherer)
- PR#6820, GPR#560: Add Obj.reachable_words to compute the
"transitive" heap size of a value
(Alain Frisch, review by Mark Shinwell and Damien Doligez)
- GPR#473: Provide `Sys.backend_type` so that user can write backend-specific
code in some cases (for example, code generator).
(Hongbo Zhang)
- GPR#589: Add a non-allocating function to recover the number of
allocated minor words.
(Pierre Chambart, review by Damien Doligez and Gabriel Scherer)
- GPR#626: String.split_on_char
(Alain Frisch)
- GPR#669: Filename.extension and Filename.remove_extension
(Alain Frisch, request by Edgar Aroutiounian, review by Daniel Bunzli
and Damien Doligez)
- GPR#674: support unknown Sys.os_type in Filename, defaulting to Unix
(Filename would previously fail at initialization time for
Sys.os_type values other than "Unix", "Win32" and "Cygwin";
mirage-os uses "xen")
(Anil Madhavapeddy)
### Other libraries
- MPR#4834, GPR#592: Add a Biggarray.Genarray.change_layout function
to switch bigarrays between C and fortran layouts.
(Guillaume Hennequin, review by Florian Angeletti)
### Code generation and optimizations:
- PR#4747, GPR#328: Optimize Hashtbl by using in-place updates of its
internal bucket lists. All operations run in constant stack size
and are usually faster, except Hashtbl.copy which can be much
slower
(Alain Frisch)
- PR#6217, GPR#538: Optimize performance of record update:
no more performance cliff when { foo with t1 = ..; t2 = ...; ... }
hits 6 updated fields
(Olivier Nicole, review by Thomas Braibant and Pierre Chambart)
- PR#7023, GPR#336: Better unboxing strategy
(Alain Frisch, Pierre Chambart)
- PR#7244, GPR#840: Ocamlopt + flambda requires a lot of memory
to compile large array literal expressions
(Pierre Chambart, review by Mark Shinwell)
- PR#7291, GPR#780: Handle specialisation of recursive function that does
not always preserve the arguments
(Pierre Chambart, Mark Shinwell, report by Simon Cruanes)
- PR#7328, GPR#702: Do not eliminate boxed int divisions by zero and
avoid checking twice if divisor is zero with flambda.
(Pierre Chambart, report by Jeremy Yallop)
- GPR#427: Obj.is_block is now an inlined OCaml function instead of a
C external. This should be faster.
(Demi Obenour)
- GPR#580: Optimize immutable float records
(Pierre Chambart, review by Mark Shinwell)
- GPR#602: Do not generate dummy code to force module linking
(Pierre Chambart, reviewed by Jacques Garrigue)
- GPR#703: Optimize some constant string operations when the "-safe-string"
configure time option is enabled.
(Pierre Chambart)
- GPR#707: Load cross module information during a meet
(Pierre Chambart, report by Leo White, review by Mark Shinwell)
- GPR#709: Share a few more equal switch branches
(Pierre Chambart, review by Gabriel Scherer)
- GPR#712: Small improvements to type-based optimizations for array
and lazy
(Alain Frisch, review by Pierre Chambart)
- GPR#714: Prevent warning 59 from triggering on Lazy of constants
(Pierre Chambart, review by Leo White)
- GPR#723 Sort emitted functions according to source location
(Pierre Chambart, review by Mark Shinwell)
- Lack of type normalization lead to missing simple compilation for "lazy x"
(Alain Frisch)
### Runtime system:
- PR#7203, GPR#534: Add a new primitive caml_alloc_float_array to allocate an
array of floats
(Thomas Braibant)
- PR#7210, GPR#562: Allows to register finalisation function that are
called only when a value will never be reachable anymore. The
drawbacks compared to the existing one is that the finalisation
function is not called with the value as argument. These finalisers
are registered with `GC.finalise_last`
(François Bobot reviewed by Damien Doligez and Leo White)
- GPR#247: In previous OCaml versions, inlining caused stack frames to
disappear from stacktraces. This made debugging harder in presence of
optimizations, and flambda was going to make this worse. The debugging
information produced by the compiler now enables the reconstruction of the
original backtrace. Use `Printexc.get_raw_backtrace_next_slot` to traverse
the list of inlined stack frames.
(Frédéric Bour, review by Mark Shinwell and Xavier Leroy)
- GPR#590: Do not perform compaction if the real overhead is less than expected
(Thomas Braibant)
### Tools:
- PR#7189: toplevel #show, follow chains of module aliases
(Gabriel Scherer, report by Daniel Bünzli, review by Thomas Refis)
- PR#7248: have ocamldep interpret -open arguments in left-to-right order
(Gabriel Scherer, report by Anton Bachin)
- PR#7272, GPR#798: ocamldoc, missing line breaks in type_*.html files
(Florian Angeletti)
- PR#7290: ocamldoc, improved support for inline records
(Florian Angeletti)
- PR#7323, GPR#750: ensure "ocamllex -ml" works with -safe-string
(Hongbo Zhang)
- PR#7350, GPR#806: ocamldoc, add viewport metadata to generated html pages
(Florian Angeletti, request by Daniel Bünzli)
- GPR#452: Make the output of ocamldep more stable
(Alain Frisch)
- GPR#548: empty documentation comments
(Florian Angeletti)
- GPR#575: Add the -no-version option to the toplevel
(Sébastien Hinderer)
- GPR#598: Add a --strict option to ocamlyacc treat conflicts as errors
(this option is now used for the compiler's parser)
(Jeremy Yallop)
- GPR#613: make ocamldoc use -open arguments
(Florian Angeletti)
- GPR#718: ocamldoc, fix order of extensible variant constructors
(Florian Angeletti)
### Debugging and profiling:
- GPR#585: Spacetime, a new memory profiler (Mark Shinwell, Leo White)
### Manual and documentation:
- PR#7007, PR#7311: document the existence of OCAMLPARAM and
ocaml_compiler_internal_params
(Damien Doligez, reports by Wim Lewis and Gabriel Scherer)
- PR#7243: warn users against using WinZip to unpack the source archive
(Damien Doligez, report by Shayne Fletcher)
- PR#7245, GPR#565: clarification to the wording and documentation
of Warning 52 (fragile constant pattern)
(Gabriel Scherer, William, Adrien Nader, Jacques Garrigue)
- #PR7265, GPR#769: Restore 4.02.3 behaviour of Unix.fstat, if the
file descriptor doesn't wrap a regular file (win32unix only)
(Andreas Hauptmann, review by David Allsopp)
- PR#7288: flatten : Avoid confusion
(Damien Doligez, report by user 'tormen')
- PR#7355: Gc.finalise and lazy values
(Jeremy Yallop)
- GPR#841: Document that [Store_field] must not be used to populate
arrays of values declared using [CAMLlocalN] (Mark Shinwell)
### Compiler distribution build system:
- GPR#324: Compiler developers: Adding new primitives to the
standard runtime doesn't require anymore to run `make bootstrap`
(François Bobot)
- GPR#384: Fix compilation using old Microsoft C Compilers not
supporting secure CRT functions (SDK Visual Studio 2005 compiler and
earlier) and standard 64-bit integer literals (Visual Studio .NET
2002 and earlier)
(David Allsopp)
- GPR#507: More sharing between Unix and Windows makefiles
(whitequark, review by Alain Frisch)
* GPR#512, GPR#587: Installed `ocamlc`, `ocamlopt`, and `ocamllex` are
now the native-code versions of the tools, if those versions were
built.
(Demi Obenour)
- GPR#687: "./configure -safe-string" to get a system where
"-unsafe-string" is not allowed, thus giving stronger non-local
guarantees about immutability of strings
(Alain Frisch, review by Hezekiah M. Carty)
### Bug fixes:
* PR#6505: Missed Type-error leads to a segfault upon record access.
(Jacques Garrigue, extra report by Stephen Dolan)
Proper fix required a more restrictive approach to recursive types:
mutually recursive types are seen as abstract types (i.e. non-contractive)
when checking the well-foundedness of the recursion.
* PR#6752: Nominal types and scope escaping.
Revert to strict scope for non-generalizable type variables, cf. Mantis.
Note that this is actually stricter than the behavior before 4.03,
cf. PR#7313, meaning that you may sometimes need to add type annotations
to explicitly instantiate non-generalizable type variables.
(Jacques Garrigue, following discussion with Jeremy Yallop,
Nicolas Ojeda Bar and Alain Frisch)
- PR#7112: Aliased arguments ignored for equality of module types
(Jacques Garrigue, report by Leo White)
- PR#7134: compiler forcing aliases it shouldn't while reporting type errors
(Jacques Garrigue, report and suggestion by sliquister)
- PR#7153: document that Unix.SOCK_SEQPACKET is not really usable.
- PR#7165, GPR#494: uncaught exception on invalid lexer directive
(Gabriel Scherer, report by KC Sivaramakrishnan using afl-fuzz)
- PR#7257, GPR#583: revert a 4.03 change of behavior on (Unix.sleep 0.),
it now calls (nano)sleep for 0 seconds as in (< 4.03) versions.
(Hannes Mehnert, review by Damien Doligez)
- PR#7260: GADT + subtyping compile time crash
(Jacques Garrigue, report by Nicolas Ojeda Bar)
- PR#7269: Segfault from conjunctive constraints in GADT
(Jacques Garrigue, report by Stephen Dolan)
- PR#7276: Support more than FD_SETSIZE sockets in Windows' emulation
of select
(David Scott, review by Alain Frisch)
* PR#7278: Prevent private inline records from being mutated
(Alain Frisch, report by Pierre Chambart)
- PR#7284: Bug in mcomp_fields leads to segfault
(Jacques Garrigue, report by Leo White)
- PR#7285: Relaxed value restriction broken with principal
(Jacques Garrigue, report by Leo White)
- PR#7297: -strict-sequence turns off Warning 21
(Jacques Garrigue, report by Valentin Gatien-Baron)
- PR#7299: remove access to OCaml heap inside blocking section in win32unix
(David Allsopp, report by Andreas Hauptmann)
- PR#7300: remove access to OCaml heap inside blocking in Unix.sleep on Windows
(David Allsopp)
- PR#7305: -principal causes loop in type checker when compiling
(Jacques Garrigue, report by Anil Madhavapeddy, analysis by Leo White)
- PR#7330: Missing exhaustivity check for extensible variant
(Jacques Garrigue, report by Elarnon *)
- PR#7369: Str.regexp raises "Invalid_argument: index out of bounds"
(Damien Doligez, report by John Whitington)
- PR#7374: Contractiveness check unsound with constraints
(Jacques Garrigue, report by Leo White)
- PR#7378: GADT constructors can be re-exposed with an incompatible type
(Jacques Garrigue, report by Alain Frisch)
- PR#7389: Unsoundness in GADT exhaustiveness with existential variables
(Jacques Garrigue, report by Stephen Dolan)
- GPR#525: fix build on OpenIndiana
(Sergey Avseyev, review by Damien Doligez)
* GPR#533: Thread library: fixed [Thread.wait_signal] so that it
converts back the signal number returned by [sigwait] to an
OS-independent number
(Jérémie Dimino)
- GPR#600: (similar to GPR#555) ensure that register typing constraints are
respected at N-way join points in the control flow graph
(Mark Shinwell)
- GPR#672: Fix float_of_hex parser to correctly reject some invalid forms
(Bogdan Tătăroiu, review by Thomas Braibant and Alain Frisch)
- GPR#700: Fix maximum weak bucket size
(Nicolas Ojeda Bar, review by François Bobot)
- GPR#708 Allow more module aliases in strengthening (Leo White)
- GPR#713, PR#7301: Fix wrong code generation involving lazy values in Flambda
mode
(Mark Shinwell, review by Pierre Chambart and Alain Frisch)
- GPR#721: Fix infinite loop in flambda due to [@@specialise] annotations
- GPR#779: Building native runtime on Windows could fail when bootstrapping
FlexDLL if there was also a system-installed flexlink
(David Allsopp, report Michael Soegtrop)
- GPR#805, GPR#815, GPR#833: check for integer overflow in String.concat
(Jeremy Yallop,
review by Damien Doligez, Alain Frisch, Daniel Bünzli, Fabrice Le Fessant)
- GPR#810: check for integer overflow in Array.concat
(Jeremy Yallop)
- GPR#814: fix the Buffer.add_substring bounds check to handle overflow
(Jeremy Yallop)
- GPR#880: Fix [@@inline] with default parameters in flambda (Leo White)
### Internal/compiler-libs changes:
- PR#7200, GPR#539: Improve, fix, and add test for parsing/pprintast.ml
(Runhang Li, David Sheets, Alain Frisch)
- GPR#351: make driver/pparse.ml functions type-safe
(Gabriel Scherer, Dmitrii Kosarev, review by Jérémie Dimino)
- GPR#516: Improve Texp_record constructor representation, and
propagate updated record type information
(Pierre Chambart, review by Alain Frisch)
- GPR#678: Graphics.close_graph crashes 64-bit Windows ports (re-implementation
of PR#3963)
(David Allsopp)
- GPR#679: delay registration of docstring after the mapper is applied
(Hugo Heuzard, review by Leo White)
- GPR#872: don't attach (**/**) comments to any particular node
(Thomas Refis, review by Leo White)
OCaml 4.03.0 (25 Apr 2016):
---------------------------
(Changes that can break existing programs are marked with a "*")
### Language features:
- PR#5528: inline records for constructor arguments
(Alain Frisch)
- PR#6220, PR#6403, PR#6437, PR#6801:
Improved redundancy and exhaustiveness checks for GADTs.
Namely, the redundancy checker now checks whether the uncovered pattern
of the pattern is actually inhabited, exploding at most one wild card.
This is also done for exhaustiveness when there is only one case.
Additionally, one can now write unreachable cases, of the form
"pat -> .", which are treated by the redundancy check.
(Jacques Garrigue)
- PR#6374: allow "_ t" as a short-hand for "(_, _, ..) t" for n-ary type
constructors
(Alain Frisch)
- PR#6714: allow [@@ocaml.warning] on most structure and signature items:
values, modules, module types
(whitequark)
- PR#6806: Syntax shortcut for putting a type annotation on a record field:
{ f1 : typ = e } is sugar for { f1 = (e : typ) }
{ f1 : typ } is sugar for { f1 = (f1 : typ) }
(Valentin Gatien-Baron, review by Jérémie Dimino)
- PR#6806: Allow type annotations before the "->" in "fun <args> -> <expr>"
fun x y : (int * int) -> (x, y)
(Valentin Gatien-Baron, review by Jérémie Dimino)
- GPR#26: support for "(type a b)" as syntactic sugar for "(type a) (type b)"
(Gabriel Scherer)
- GPR#42: short functor type syntax: "S -> T" for "functor (_ : S) -> T"
(Leo White)
- GPR#88: allow field punning in object copying expressions:
{< x; y; >} is sugar for {< x = x; y = y; >}
(Jeremy Yallop)
- GPR#112: octal escape sequences for char and string literals
"Make it \o033[1mBOLD\o033[0m"
(Rafaël Bocquet, request by John Whitingthon)
- GPR#167: allow to annotate externals' arguments and result types so
they can be unboxed or untagged: [@unboxed], [@untagged]. Supports
untagging int and unboxing int32, int64, nativeint and float.
(Jérémie Dimino, Mark Shinwell)
- GPR#173: [@inline] and [@inlined] attributes (for function declarations
and call sites respectively) to control inlining
(Pierre Chambart, Mark Shinwell)
- GPR#188: accept [@@immediate] attribute on type declarations to mark types
that are represented at runtime by an integer
(Will Crichton, reviewed by Leo White)
* GPR#234: allow "[]" as a user-defined constructor. Demand parenthesis
around "::" when using "::" as user-defined constructor:
code using "| :: of ..." must change to "| (::) of ...".
(Runhang Li, review by Damien Doligez)
- GPR#240: replace special annotations on externals by attributes:
* "float" is generalized to [@@unboxed]
* "noalloc" becomes [@@noalloc]
Deprecate "float" and "noalloc".
(Jérémie Dimino)
- GPR#254: @ocaml.warn_on_literal_pattern attribute on constructors to
warn when the argument is matches against a constant pattern. This
attribute is applied on predefined exception constructors which
carry purely informational (with no stability guarantee) messages.
(Alain Frisch)
- GPR#268: hexadecimal notation for floating-point literals: -0x1.ffffp+987
In OCaml source code, FP literals can be written using the hexadecimal
notation 0x<mantissa in hex>p<exponent> from ISO C99.
(Xavier Leroy)
- GPR#273: allow to get the extension slot of an extension constructor
by writing [%extension_constructor <path>]
(Jérémie Dimino)
- GPR#282: change short-paths penalty heuristic to assign the same cost to
idents containing double underscores as to idents starting with an underscore
(Thomas Refis, Leo White)
- PR#6681 GPR#326: signature items are now accepted as payloads for
extension and attributes, using the syntax [%foo: SIG ] or [@foo: SIG ].
Examples: "[%%client: val foo : int]" or "val%client foo : int".
(Alain Frisch and Gabriel Radanne)
* GPR#342: Allow shortcuts for extension and attributes on all keywords:
module%foo, class[@foo], etc.
The attribute in "let[@foo] .. in .." is now attached to the value binding,
not to the expression.
(Gabriel Radanne)
### Compilers:
* PR#4231, PR#5461: warning 31 is now fatal by default
(Warning 31: A module is linked twice in the same executable.)
This is an interim solution; double-linking of modules has dangerous
semantics, eg. exception constructors end up with two distinct declarations.
(Alain Frisch)
- PR#4800: better compilation of tuple assignment
(Gabriel Scherer and Alain Frisch)
- PR#5995: keep -for-pack into account to name exceptions;
-for-pack should now be used during bytecode compilation as well
(Alain Frisch, report by Christophe Troestler)
- PR#6400: better error message for '_' used as an expression
(Alain Frisch, report by whitequark)
- PR#6501: harden the native-code generator against certain uses of "%identity"
(Xavier Leroy, report by Antoine Miné)
- PR#6636: add --version option
(whitequark)
- PR#6679: fix pprintast printing of constraints in type declarations
(Alain Frisch, report by Jun Furuse)
- PR#6737: fix Typedtree attributes on (fun x -> body) expressions
(Alain Frisch, report by Oleg Kiselyov)
* PR#6865: remove special case for parsing "let _ = expr" in structures
(Jérémie Dimino, Alain Frisch)
* PR#6438, PR#7059, GPR#315: Pattern guard disables exhaustiveness check
(function Some x when x = 0 -> ()) will now raise warning 8 (non-exhaustive)
instead of warning 25 (all clauses are guarded). 25 isn't raised anymore.
Projects that set warning 8 as an error may fail to compile (presumably
this is the semantics they wanted).
(Alain Frisch, request by Martin Jambon and John Whitington)
- PR#6920: fix debug informations around uses of %apply or %revapply
(Jérémie Dimino, report by Daniel Bünzli)
- PR#6939: Segfault with improper use of let-rec
(Alain Frisch)
- PR#6943: native-code generator for POWER/PowerPC 64 bits, both in
big-endian (ppc64) and little-endian (ppc64le) configuration.
(Xavier Leroy, with inspiration from RedHat's unofficial ppc64 and ppc64le
ports)
- PR#6979: better code generation in x86-32 backend for copying floats to
the stack
(Marc Lasson, review by Xavier Leroy)
- PR#7018: fix missing identifier renaming during inlining
(Alain Frisch, review by Xavier Leroy)
- PR#7022, GPR#259: unbox float and boxed ints earlier, avoid second pass
(Alain Frisch)
- PR#7026, GPR#288: remove write barrier for polymorphic variants without
arguments
(Simon Cruanes)
- PR#7031: new warning 57, ambiguous guarded or-patterns
(Luc Maranget, Gabriel Scherer, report by Martin Clochard and Claude Marché)
- PR#7064, GPR#316: allowing to mark compilation units and sub-modules as
deprecated
(Alain Frisch)
- PR#7067: fix performance regression (wrt. 4.01) in the native compiler
for long nested structures
(Alain Frisch, report by Daniel Bünzli, review by Jacques Garrigue)
- PR#7097: fix strange syntax error message around illegal packaged module
signature constraints
(Alain Frisch, report by Jun Furuse)
- PR#7118, PR#7120, GPR#408, GPR#476: Bug fixed in stack unwinding
metadata generation. Was a cause of crashes in GUI programs on OS X.
(Bart Jacobs, review by Mark Shinwell)
- PR#7168: Exceeding stack limit in bytecode can lead to a crash.
(Jacques-Henri Jourdan)
- PR#7232: Strange Pprintast output with ppx_deriving
(Damien Doligez, report by Anton Bachin)
- GPR#17: some cmm optimizations of integer operations with constants