[cwn] Attn: Development Editor, Latest Caml Weekly News
Alan Schmitt
alan.schmitt at polytechnique.org
Tue Jun 21 04:21:31 PDT 2011
Hello,
Here is the latest Caml Weekly News, for the week of June 14 to 21, 2011.
1) OCaml 3.12.1 Release Candidate
2) OCaml 3.12.1 compatibility report
3) Junior engineer position at INRIA Saclay/Ecole Polytechnique, France
4) value restriction and records' rank-2 polymorphism
5) Other Caml News
========================================================================
1) OCaml 3.12.1 Release Candidate
Archive: <https://sympa-roc.inria.fr/wws/arc/caml-list/2011-06/msg00072.html>
------------------------------------------------------------------------
** Damien Doligez announced:
Dear OCaml users,
The release of OCaml version 3.12.1 is imminent. We have
created a release candidate for your testing pleasure. Please
download the sources, compile, install, and test your favourite
software with it. Then let me know what happened, one way or
the other.
We want to know about any show-stopping bugs, especially in the
compilation and installation phases.
This release candidate is available as source code at this
address: <http://caml.inria.fr/pub/distrib/ocaml-3.12/>
Happy hacking,
-- Damien Doligez for the OCaml team.
Objective Caml 3.12.1:
----------------------
Bug fixes:
- PR#4345, PR#4767: problems with camlp4 printing of float values
- PR#4380: ocamlbuild should not use tput on windows
- PR#4487, PR#5164: multiple 'module type of' are incompatible
- PR#4552: ocamlbuild does not create symlinks when using '.itarget' file
- PR#4673, PR#5144: camlp4 fails on object copy syntax
- PR#4702: system threads: cleanup tick thread at exit
- PR#4732: camlp4 rejects polymorphic variants using keywords from macros
- PR#4778: Win32/MSVC port: rare syntax error in generated MASM assembly file
- PR#4794, PR#4959: call annotations not generated by ocamlopt
- PR#4820: revised syntax pretty printer crashes with 'Stack_overflow'
- PR#4928: wrong printing of classes and class types by camlp4
- PR#4939: camlp4 rejects patterns of the '?x:_' form
- PR#4967: ocamlbuild passes wrong switches to ocamldep through menhir
- PR#4972: mkcamlp4 does not include 'dynlink.cma'
- PR#5039: ocamlbuild should use '-linkpkg' only when linking programs
- PR#5066: ocamldoc: add -charset option used in html generator
- PR#5069: fcntl() in caml_sys_open may block, do it within blocking section
- PR#5071, PR#5129, PR#5134: inconsistencies between camlp4 and camlp4*
binaries
- PR#5080, PR#5104: regression in type constructor handling by camlp4
- PR#5090: bad interaction between toplevel and camlp4
- PR#5095: ocamlbuild ignores some tags when building bytecode objects
- PR#5100: ocamlbuild always rebuilds a 'cmxs' file
- PR#5103: build and install objinfo when building with ocamlbuild
- PR#5109: crash when a parser calls a lexer that calls another parser
- PR#5110: invalid module name when using optional argument
- PR#5115: bytecode executables produced by msvc64 port crash on 32-bit
versions
- PR#5117: bigarray: wrong function name without HAS_MMAP; missing include
- PR#5118: Camlp4o and integer literals
- PR#5122: camlp4 rejects lowercase identifiers for module types
- PR#5123: shift_right_big_int returns a wrong zero
- PR#5124: substitution inside a signature leads to odd printing
- PR#5128: typo in 'Camlp4ListComprehension' syntax extension
- PR#5136: obsolete function used in emacs mode
- PR#5145: ocamldoc: missing html escapes
- PR#5146: problem with spaces in multi-line string constants
- PR#5149: (partial) various documentation problems
- PR#5156: rare compiler crash with objects
- PR#5165: ocamlbuild does not pass '-thread' option to ocamlfind
- PR#5167: camlp4r loops when printing package type
- PR#5172: camlp4 support for 'module type of' construct
- PR#5175: in bigarray accesses, make sure bigarray expr is evaluated only
once
- PR#5177: Gc.compact implies Gc.full_major
- PR#5182: use bytecode version of ocamldoc to generate man pages
- PR#5184: under Windows, alignment issue with bigarrays mapped from files
- PR#5188: double-free corruption in bytecode system threads
- PR#5192: mismatch between words and bytes in interpreting max_young_wosize
- PR#5202: error in documentation of atan2
- PR#5209: natdynlink incorrectly detected on BSD systems
- PR#5213: ocamlbuild should pass '-rectypes' to ocamldoc when needed
- PR#5217: ocamlfind plugin should add '-linkpkg' for toplevel
- PR#5228: document the exceptions raised by functions in 'Filename'
- PR#5229: typo in build script ('TAG_LINE' vs 'TAGLINE')
- PR#5230: error in documentation of Scanf.Scanning.open_in
- PR#5234: option -shared reverses order of -cclib options
- PR#5237: incorrect .size directives generated for x86-32 and x86-64
- PR#5244: String.compare uses polymorphic compare_val (regression of PR#4194)
- PR#5248: regression introduced while fixing PR#5118
- PR#5252: typo in docs
- PR#5258: win32unix: unix fd leak under windows
- PR#5269: (tentative fix) Wrong ext_ref entries in .annot files
- PR#5272: caml.el doesn't recognize downto as a keyword
- PR#5276: issue with ocamlc -pack and recursively-packed modules
- PR#5280: alignment constraints incorrectly autodetected on MIPS 32
- PR#5281: typo in error message
- camlp4 revised syntax printing bug in the toplevel (reported on caml-list)
- configure: do not define _WIN32 under cygwin
- Hardened generic comparison in the case where two custom blocks
are compared and have different sets of custom operations.
- Hardened comparison between bigarrays in the case where the two
bigarrays have different kinds.
- Fixed wrong autodetection of expm1() and log1p().
- don't add .exe suffix when installing the ocamlmktop shell script
- ocamldoc: minor fixes related to the display of ocamldoc options
- fixed bug with huge values in OCAMLRUNPARAM
- mismatch between declaration and definition of caml_major_collection_slice
Feature wishes:
- PR#4992: added '-ml-synonym' and '-mli-synonym' options to ocamldep
- PR#5065: added '-ocamldoc' option to ocamlbuild
- PR#5139: added possibility to add options to ocamlbuild
- PR#5158: added access to current camlp4 parsers and printers
- PR#5180: improved instruction selection for float operations on amd64
- stdlib: added a 'usage_string' function to Arg
- allow with constraints to add a type equation to a datatype definition
- ocamldoc: allow to merge '@before' tags like other ones
- ocamlbuild: allow dependency on file "_oasis"
Other changes:
- Changed default minor heap size from 32k to 256k words.
- Added new operation 'compare_ext' to custom blocks, called when
comparing a custom block value with an unboxed integer.
========================================================================
2) OCaml 3.12.1 compatibility report
Archive: <https://sympa-roc.inria.fr/wws/arc/caml-list/2011-06/msg00073.html>
------------------------------------------------------------------------
** Damien Doligez announced (patches may be found at the link):
OCaml 3.12.1 Compatibility Report
I have compiled the following software with the latest release
candidate of OCaml (3.12.1+rc1).
See below for a list of what I had to patch to get these to compile.
The packages I had to patch are marked here with a *
* advi-1.9.0.tar.gz
alt-ergo-0.93.tar.gz
bin_prot-1.3.1.tar.gz
* boomerang-0.2-source.tar.gz
* cameleon-1.9.21.tar.gz
* camlimages-4.0.0.tar.bz2
camomile-0.8.2.tar.bz2
camlp5-6.02.2.tgz
* camlzip-1.04.tar.gz
config-file-1.0.tar.gz
coq-8.3pl2.tar.gz
core-0.7.0.tar.gz
core_extended-0.7.0.tar.gz
cryptokit-1.4.tar.gz
extlib-1.5.1.tar.gz
fieldslib-0.1.2.tar.gz
findlib-1.2.7.tar.gz
frama-c-Carbon-20110201.tar.gz
* hevea-1.10.tar.gz
lablgtk-2.14.2.tar.gz
* lablgtkextras-1.0.tar.gz
lwt-2.3.0.tar.gz
menhir-20110201.tar.gz
* oasis-0.2.0.tar.gz
* obrowser-1.1.tar.gz
* ocaml-data-notation-0.0.3.tar.gz
ocaml-expect-0.0.2.tar.gz
* ocaml-fileutils-0.4.2.tar.gz
ocaml-mysql-1.0.4.tar.gz
ocaml-sqlite3-release-1.6.1.tar.gz
ocaml-ssl-0.4.5.tar.gz
ocaml-text-0.4.tar.gz
ocamlgraph-1.7.tar.gz
ocamlify-0.0.1.tar.gz
ocamlnet-3.2.1.tar.gz
ocgi-0.5.tar.gz
ocsigen-1.3.4.tar.gz
* omake-0.9.8.6-0.rc1.tar.gz
ounit-1.1.0.tar.gz
pcre-ocaml-release-6.2.2.tar.gz
react-0.9.2.tbz
res-release-3.2.0.tar.gz
sexplib-5.2.1.tar.gz
sks-1.1.1.tgz
type-conv-2.3.0.tar.gz
unison-2.40.63.tar.gz
* vsyml-2010-04-06.tar.gz
* xml-light-2.2.zip
zen_2.3.2.tar.gz
-----------------------------------------------------------
This is what I had to patch because of problems unrelated to 3.12.1:
advi: 2 lines
Change Makefile to link with graphics and lablgtk
boomerang: 1 line
Change Makefile to remove "doc" from subdirs
cameleon: 5 lines
Change ed_main.ml to remove call to GtkThread.set_do_jobs_delay
Change checkocaml.ml: detection of lablgtkextras depends on xml-light
configuration
camlimages: 15 lines
Add oPng.mli and oJpeg.mli
Change META file to add archives camlimages.cma and .cmxa (neeed for advi)
camlzip: 10 lines
Change Makefile to configure the location of libz.a
Add a META file for findlib
hevea: 2 lines
Change hevea.ml to remove target file in case of error
Change Makefile to pass LIBDIR and LATEXLIBDIR to install script
lablgtkextras: 40 lines
Change checkocaml.ml and Makefiles to detect where is xml-light installed
(see xml-light below)
oasis: 8 lines
Change setup.ml to handle OCaml version numbers with a + suffix
obrowser-1.1: 13 lines
Change in Makefile to add .PHONY annotation to AXO (my filesystem is
case-insensitive, so AXO interferes with axo).
Update pervasives.ml and pervasives.mli to reflect OCaml changes since
3.11.1
ocaml-data-notation: 3 lines
Change in Makefile to follow name change of "type-conv.syntax" to
"type-conv"
Changes in pa_odn.ml to remove extraneous occurrences "_loc"
ocaml-fileutils: 2 lines
Changes in Makefile to remove use of non-portable "install -t"
omake: 1 line
Change in OMakefiles to remove "-warn-error A"
Note: DO NOT use "-warn-error A" in released code.
vsyml: 4 lines
Changes in Makefile to remove non-portable "echo -n"
xml-light: 3 lines
Changes in Makefile to install in a subdirectory of .../lib/ocaml
This is needed because xml-light exports xml.cmi and ocsigen has a
file xML.mli. These conflict because my filesystem is case-insensitive.
** Sylvain Le Gall replied:
> oasis: 8 lines
> Change setup.ml to handle OCaml version numbers with a + suffix
>
Fixed in oasis 0.2.1~alpha1
> ocaml-data-notation: 3 lines
> Change in Makefile to follow name change of "type-conv.syntax" to "type-c=
> onv"
Fixed in ocaml-data-notation 0.0.5
> Changes in pa_odn.ml to remove extraneous occurrences "_loc"
Probably fixed in 0.0.5
>
> ocaml-fileutils: 2 lines
> Changes in Makefile to remove use of non-portable "install -t"
>
Fixed in ocaml-fileutils 0.4.3
** Stéphane Glondu replied:
Very nice! As far as Debian is concerned, basically all packages
currently in unstable (with type-conv and its reverse dependencies
taken from testing) compile with no changes. The resulting binary
packages are available at:
<http://ocaml.debian.net/debian/ocaml-3.12.1%2Brc1/>
========================================================================
3) Junior engineer position at INRIA Saclay/Ecole Polytechnique, France
Archive: <https://sympa-roc.inria.fr/wws/arc/caml-list/2011-06/msg00081.html>
------------------------------------------------------------------------
** Kaustuv Chaudhuri announced:
The Parsifal research team at INRIA Saclay and the Ecole Polytechnique
has an open call for one junior engineer position (2 years).
The main task of the recruited engineer will be to work on the
integration and further development of a number of computational
logic systems designed and built by the team members in recent
years. Some tasks involved are:
- Designing and implementing a common formal framework for
communication between the Abella proof assistant, the Bedwyr
symbolic model checker, and the Tac inductive theorem prover.
- Using the Teyjus implementation of the Lambda Prolog programming
language to represent and animate logical specifications of
deductive and computational systems.
- Investigating a number of application domains including the formal
meta-theory of computational systems (programming languages,
process calculi, etc.), and the use of formal proofs as
certificates (eg. proof-carrying code, marketplace of proofs).
Candidates should have a bachelor's degree in computer science, be
familiar with the OCaml programming language (or similar high-level
programming languages), and have a background in logic, formal
methods, and symbolic computing.
As this engineer will work with a team of international researchers,
the candidate should be fluent in English. Knowledge of French is
desirable but not mandatory.
The position should begin in October 2011.
Interested candidates are encouraged to contact the following people:
Dale Miller
<dale.miller AT inria.fr>.
Kaustuv Chaudhuri
<kaustuv.chaudhuri AT inria.fr>
Some links:
Official announcements:
<http://www.lix.polytechnique.fr/parsifal/dokuwiki/doku.php?id=engineer>
<http://en.inria.fr/institute/recruitment/offers/young-graduate-engineers>
Parsifal team web page: <http://www.lix.polytechnique.fr/parsifal/>
System descriptions:
Bedwyr <http://slimmer.gforge.inria.fr/bedwyr/>
Abella <http://abella.cs.umn.edu/>
Tac <http://slimmer.gforge.inria.fr/tac/>
Teyjus <http://teyjus.cs.umn.edu/>
========================================================================
4) value restriction and records' rank-2 polymorphism
Archive: <https://sympa-roc.inria.fr/wws/arc/caml-list/2011-06/msg00084.html>
------------------------------------------------------------------------
** Dmitry Grebeniuk asked and Jacques Garrigue replied:
> I need to create two functions that share common state, and I want to
> create this common state once per program run, and I want to make each
> function call very cheap. When I'm doing it naively, I get "value
> restriction":
>
> $ ocaml
> # #use "topfind";;
> # #camlp4r;;
> # type func 'a 'r = string -> ('a -> 'r) -> 'r;
> type func 'a 'b = string -> ('a -> 'b) -> 'b
> # value mkpair1 from_string =
> (* some common values here *)
> ( fun s f -> try f (from_string s) with [e -> failwith "mkpair1"]
> , fun s f -> try f (Some (from_string s)) with [e -> f None]
> );
> value mkpair1 :
> ('a -> 'b) -> ('a -> ('b -> 'c) -> 'c * 'a -> (option 'b -> 'd) -> 'd) =
> <fun>
> # value identity x = x;
> value identity : 'a -> 'a = <fun>
> # value (id11, id12) = mkpair1 identity;
> value id11 : '_a -> ('_a -> '_b) -> '_b = <fun>
> value id12 : '_a -> (option '_a -> '_b) -> '_b = <fun>
>
> But I've found a trick that uses rank-2 polymorphism of record fields:
>
> # type pair 'a 'b =
> { notnull : !'r . func 'a 'r
> ; nullable : !'r . func (option 'a) 'r
> };
> type pair 'a 'b =
> { notnull : !'c. func 'a 'c; nullable : !'d. func (option 'a) 'd }
> # value mkpair2 from_string =
> (* some common values here *)
> { notnull = fun s f -> try f (from_string s) with [e -> failwith "mkpair2"]
> ; nullable = fun s f -> try f (Some (from_string s)) with [e -> f None]
> };
> value mkpair2 : (string -> 'a) -> pair 'a 'b = <fun>
> # value { notnull = id21 ; nullable = id22 } = mkpair2 identity;
> value id21 : func string 'a = <fun>
> value id22 : func (option string) 'a = <fun>
> #
>
> And everything seems to work: the record is created once, then
> it is "decomposed" to id21 and id22 functions (either right after its
> creation or on each call, it should be cheap anyway). But I don't
> know whether this solution is correct and will it remain correct in
> future versions of OCaml -- can you help me here?
I'm not sure I understand the details of all you are trying do,
but there is no plan to remove polymorphic record fields from the
language, so you can use this feature safely.
(Strictly speaking, this is a language extension, so there may be
some changes in the future, but there is nothing planned)
Since 3.12, an alternative approach which should be just as cheap
is to use a first class module. This is a bit more verbose.
module type Pair = sig
type t
val notnull : (t,'r) func
val nullable : (t option, 'r) func
end
let mkpair (type a) from_string =
(module struct
type t = a
let notnull s f = try f (from_string s) with e -> failwith "mkpair"
let nullable s f = try f (Some (from_string s)) with e -> f None
end : Pair with type t = a)
module M = (val (mkpair (fun x -> x)) : Pair with type t = string)
let id31 = M.notnull
let id32 = M.nullable
========================================================================
5) Other Caml News
------------------------------------------------------------------------
** From the ocamlcore planet blog:
Thanks to Alp Mestan, we now include in the Caml Weekly News the links
to the recent posts from the ocamlcore planet blog at
<http://planet.ocamlcore.org/>.
Turning dynamic web programming on it's head: declarative dynamic html with heist:
<http://blog.dbpatterson.com/post/6736312764>
mleternal 0.2 released:
<https://forge.ocamlcore.org/forum/forum.php?forum_id=796>
Back From IFIP SEC 2011:
<http://seb.mondet.org/blog/post/ifip-sec-2011.html>
Constructive gem: an injection from Baire space to natural numbers:
<http://math.andrej.com/2011/06/15/constructive-gem-an-injection-from-baire-space-to-natural-numbers/>
========================================================================
Old cwn
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