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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:
### Runtime system:
### 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#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)
- 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)
### Standard library:
- 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#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)
### Other libraries:
- 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)
### Tools:
- PR#7333: ocamldoc, use the first sentence of text file as
a short description in overviews.
(Florian Angeletti)
### Compiler distribution build system:
- 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)
### Internal/compiler-libs changes:
- 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)
### Bug fixes
- GPR#795: remove 256-character limitation on Sys.executable_name
(Xavier Leroy)
- GPR#814: fix the Buffer.add_substring bounds check to handle overflow
(Jeremy Yallop)
- GPR#810: check for integer overflow in Array.concat
(Jeremy Yallop)
- 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)
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)
- GPR#912: Fix segfault in Unix.create_process on Windows caused by wrong header
configuration.
(David Allsopp)
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:
- GPR#473: Provide `Sys.backend_type` so that user can write backend-specific
code in some cases (for example, code generator).
(Hongbo Zhang)
- 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#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)
### 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#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#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
(Stephen Dolan, review by Pierre Chambart)
- GPR#89: improve type-specialization of unapplied primitives:
unapplied annotations (compare : int -> _),
type propagation (List.sort compare [1;2;3])
and propagation from module signatures now lead to specialization
(Frédéric Bour, review by Gabriel Scherer)
- GPR#107: Prevent more unnecessary float boxing, especially in `if` and `match`
(Vladimir Brankov, review by Alain Frisch)
- GPR#109: new (lazy) unboxing strategy for float and int references
(Vladimir Brankov, review by Alain Frisch)
- GPR#115: More precise typing of values at the C-- and Mach level.
(Xavier Leroy, review by Pierre Chambart)
- GPR#132: Flambda: new intermediate language and "middle-end" optimizers
(Pierre Chambart, Mark Shinwell, Leo White)
- GPR#212, PR#7226, GPR#542: emit column position in gas assembly `.loc`
(Frédéric Bour, Anton Bachin)
- GPR#207: Colors in compiler messages (warnings, errors)
configure with -color {auto|always|never} or TERM=dumb
(Simon Cruanes, review by Gabriel Scherer)
- GPR#258: more precise information on PowerPC instruction sizes
(Pierre Chambart, Xavier Leroy)
- GPR#263: improve code generation for if-equivalents of (&&) and (||)
(Pierre Chambart)
- GPR#270: Make [transl_exception_constructor] generate [Immutable] blocks
(Mark Shinwell)
- GPR#271: Fix incorrect mutability flag when records are built using "with"
(Mark Shinwell)
- GPR#275: native-code generator for IBM z System running Linux.
In memoriam Gene Amdahl, 1922-2015.
(Bill O'Farrell, Tristan Amini, Xavier Leroy)
- GPR#282: relax short-paths safety check in presence of module aliases, take
penalty into account while building the printing map.
(Thomas Refis, Leo White)
- GPR#306: Instrument the compiler to debug performance regressions
(Pierre Chambart)
- GPR#319: add warning 58 for missing cmx files, and
extend -opaque option to mli files: a missing .cmx does not warn
if the corresponding .cmi is compiled -opaque.
(Leo White)
- GPR#388: OCAML_FLEXLINK environment variable allows overriding flexlink
command (David Allsopp)
- GPR#392: put all parsetree invariants in a new module Ast_invariants
(Jérémie Dimino)
- GPR#407: don't display the name of compiled .c files when calling the
Microsoft C Compiler (same as the assembler).
(David Allsopp)
- GPR#431: permit constant float arrays to be eligible for pattern match
branch merging
(Pierre Chambart)
- GPR#455: provide more debugging information to Js_of_ocaml
(Jérôme Vouillon)
- GPR#514, GPR#554: Added several command-line flags to explicitly enable
settings that are currently the default:
`-alias-deps`, `-app-funct`, `-no-keep-docs`, `-no-keep-locs`,
`-no-principal`, `-no-rectypes`, `-no-strict-formats`
(Demi Obenour)
- GPR#545: use reraise to preserve backtrace on
`match .. with exception e -> raise e`
(Nicolas Ojeda Bar, review by Gabriel Scherer)
### Runtime system:
* GPR#442, caml_fill_string, and caml_create_string is deprecated
and will be removed in the future, please use caml_fill_bytes
and caml_create_bytes for migration
(Hongbo Zhang, review by Damien Doligez, Alain Frisch, and Hugo Heuzard)
- PR#3612, PR#92: allow allocating custom block with finalizers
in the minor heap.
(Pierre Chambart)
* PR#6517: use ISO C99 types {,u}int{32,64}_t in preference to our homegrown
types {,u}int{32,64}.
C stubs may have to be updated as {,u}int{32,64}_t are not defined anymore.
(Xavier Leroy)
- PR#6760: closures evaluated in the toplevel can now be marshalled
(whitequark, review by Jacques-Henri Jourdan)
- PR#6902, GPR#210: emit a runtime warning on stderr
when finalizing an I/O channel which is still open:
"channel opened on file '...' dies without being closed"
this is controlled by OCAMLRUNPARAM=W=1 or with Sys.enable_runtime_warnings.
The behavior of affected program is not changed,
but they should still be fixed.
(Alain Frisch, review by Damien Doligez)
- Signal handling: for read-and-clear, use GCC/Clang atomic builtins
if available.
(Xavier Leroy)
- PR#6910, GPR#224: marshaling (output_value, input_value, et al)
now support marshaled data bigger than 4 Gb.
(Xavier Leroy)
* GPR#226: select higher levels of optimization for GCC >= 3.4 and Clang
when compiling the run-time system and C stub code.
"-std=gnu99 -O2 -fno-strict-aliasing -fwrapv" is used by default.
This also affects default flags for user stubs compiled with "ocamlc -c foo.c"
and may uncover bugs in them.
(Xavier Leroy)
- GPR#262: Multiple GC roots per compilation unit
(Pierre Chambart, Mark Shinwell, review by Damien Doligez)
* GPR#297: Several changes to improve the worst-case GC pause time.
Changes Gc.control and Gc.major_slice and adds functions to the Gc module.
(Damien Doligez, with help from Francois Bobot, Thomas Braibant, Leo White)
- GPR#325: Add v=0x400 flag to OCAMLRUNPARAM to display GC stats on exit
(Louis Gesbert, review by Alain Frisch)
### Standard library:
- PR#1460, GPR#230: Array.map2, Array.iter2
(John Christopher McAlpine)
- PR#5197, GPR#63: Arg: allow flags such as --flag=arg as well as --flag arg
(Richard Jones)
- PR#6017, PR#7034, GPR#267: More efficient ifprintf implementation
(Jeremy Yallop, review by Gabriel Scherer)
- PR#6296: Some documentation on the floating-point representations
recognized by Pervasives.float_of_string
(Xavier Leroy)
- PR#6316: Scanf.scanf failure on %u formats when reading big integers
(Xavier Leroy, Benoît Vaugon)
- PR#6321: guarantee that "hypot infinity nan = infinity"
(for conformance with ISO C99)
(Xavier Leroy)
- PR#6390, GPR#36: expose Sys.{int_size,max_wosize} for js_of_ocaml portability
(Hugo Heuzard)
- PR#6449: Add Map.union
(Alain Frisch)
* PR#6494: Add 'equal' functions in modules
Bytes, Char, Digest, Int32, Int64, Nativeint, and String
Users defining their own modules with signature 'module type of Int32'
have to extend their implementation.
(Romain Calascibetta)
* PR#6524, GPR#79: Filename: Optional ?perms argument to open_temp_file
May break partial applications of the function (fix by passing ?perms:None)
(Daniel Bünzli, review by Jacques-Pascal Deplaix)
* PR#6525, GPR#80: Add Uchar module to the standard library
May introduce module name conflicts with existing projects.
(Daniel Bünzli, review by Yoriyuki Yamagata and Damien Doligez)
- PR#6577: improve performance of %L, %l, %n, %S, %C format specifiers
(Alain Frisch)
- PR#6585: fix memory leak in win32unix/createprocess.c
(Alain Frisch, report by user 'aha')
- PR#6645, GPR#174: Guarantee that Set.add, Set.remove, Set.filter
return the original set if no change is required
(Alain Frisch, Mohamed Iguernlala)
- PR#6649, GPR#222: accept (int_of_string "+3")
(John Christopher McAlpine)
- PR#6694, PR#6695, GPR#124: deprecate functions using ISO-8859-1 character set
in Char, Bytes, String and provide alternatives *_acii using US-ASCII.
Affected functions:
{Char,String,Bytes}.{uppercase,lowercase},
{String,Bytes}.{capitalize,uncaptialize}
(whitequark, review by Damien Doligez)
- GPR#22: Add the Ephemeron module that implements ephemerons and weak
hash table
(François Bobot, review by Damien Doligez, Daniel Bünzli,
Alain Frisch, Pierre Chambart)
- GPR#164: more efficient (branchless) implementation of Pervasives.compare
specialized at type 'float'.
(Vladimir Brankov)
- GPR#175: Guarantee that Map.add, Map.remove, Map.filter
return the original map if no change is required.
(Mohamed Iguernlala)
- GPR#201: generalize types of Printf.{ifprintf,ikfprintf}
(Maxence Guesdon)
- GPR#216: add the missing POSIX.1-2001 signals in Sys
(Guillaume Bury)
- GPR#239: remove type-unsafe code from Stream
(Pierre Chambart, review by Gabriel Scherer and Jeremy Yallop)
- GPR#250: Check for negative start element in Array.sub
(Jeremy Yallop)
- GPR#265: new implementation of Queue avoiding Obj.magic
(Jérémie Dimino)
- GPR#268, GPR#303: '%h' and '%H' modifiers for printf and scanf to
support floating-point numbers in hexadecimal notation
(Xavier Leroy, Benoît Vaugon)
- GPR#272: Switch classify_float to [@@unboxed]
(Alain Frisch)
- Improve speed of classify_float by not going through fpclassify()
(Alain Frisch, Xavier Leroy)
- GPR#277: Switch the following externals to [@@unboxed]:
* {Nativeint,Int32,Int64}.{of,to}_float
* Int{32,64}.float_of_bits
* Int{32,64}.bits_of_float
(Jérémie Dimino)
- GPR#281: Switch the following externals to [@@unboxed]:
* Sys.time (and [@@noalloc])
* Pervasives.ldexp (and [@@noalloc])
* Pervasives.compare for float, nativeint, int32, int64.
(François Bobot)
- PR#3622, GPR#195: add function Stack.fold
(Simon Cruanes)
- GPR#329: Add exists, for_all, mem and memq functions in Array
(Bernhard Schommer)
- GPR#337: Add [Hashtbl.filter_map_inplace]
(Alain Frisch)
- GPR#356: Add [Format.kasprintf]
(Jérémie Dimino, Mark Shinwell)
### Type system:
- PR#5545: Type annotations on methods cannot control the choice of abbreviation
(Jacques Garrigue)
* PR#6465: allow incremental weakening of module aliases.
This is done by adding equations to submodules when expanding aliases.
In theory this may be incompatible is some corner cases defining a module
type through inference, but no breakage known on published code.
(Jacques Garrigue)