Change in GNU Prolog version 1.4.2:

* fix a bug in the x86/NetBSD port
* fix a bug in the compiler for byte-code with op/3 directive
* fix a bug in the debugger
* modify decompose_file_name/4 (fix problems under windows)
* add built-in is_absolute_file_name/1 and is_relative_file_name/1
* modify the compiler include/1 directive handling
  (if the file to include is not found, seach in directories of parent includers)
* modify atom table management (its size can be defined via env. var MAX_ATOM)
* fix a bug with soft-call inside a meta-call
* implement term_hash/2 and term_hash/4. Bacward incompatibility:
  new_atom/3 and and atom_hash/2 no longer exists.
* fix some little bugs with 64 bits (e.g. stream id)
* modify the FD solver to handle very long computations
* fix a bug in the compiler (unification with fresh vars in the body)
* fix a bug with *-> containing ! in the test part (! was not local to the test)
* fix a bug to configure with sigaction on old linux kernels
* fix some problems/bugs on 64 bits machine

Change in GNU Prolog version 1.4.1:

* improve signal handling
* add an option --wam-comment to gplc and pl2wam
* fix multifile directive (works now with an empty predicate as required by ISO)
* fix absolute_file_name to expand ~ using HOMEDRIVE and HOMEPATH under windows
  if HOME is not defined
* improve listing/0-1 output
* add soft cut control construct and its associated operator *->
* improve the top-level results in case of cyclic terms
* fix arithmetic evaluable functor ^/2 to work with floats
* increase maximum number of variables in a term
* add write_term option variable_names
* add built-in predicates between/3 and succ/2
* fix bug in the DCG expander
* fix bug in member/2
* recognize escape sequence \s (space) and \e (escape) if strict_iso is off
* add error detection in length/2 if given length is negative
* add built-in predicates maplist/2-5
* fix a regression bug in the FD solver about sparse domains
* increase size of FD internal stacks and fix memory leak
* port to x86_64/Darwin (Mac OS X) - many thanks to:
  Ozaki Kiichi <gclient.gaap@gmail.com>
* fix a bug in x86_64 with --disable-regs
* fix a bug when consulting a file under Win XP/Vista 32 bits
* fix a bug when consulting a file using '$VAR'(N) or '$VARNAME'(A)
* fix a bug in new_atom/1-2 which returned duplicates
* fix a bug in write/1 when an empty atom is passed
* improve portray_clause (numbervars and space before final dot)

Change in GNU Prolog version 1.4.0:

* GNU Prolog is now licensed under a dual license LGPL or GPL
* port to x86_64/MinGW - many thanks to:
  Jasper Taylor <jasper@simulistics.com> (see src/WINDOWS64)
* port to x86_64/MSVC (see src/WINDOWS64)
* add a configure option to control Windows HtmlHelp
  --disable-htmlhelp or --enable-htmlhelp[=static/dynamic]
* improve a lot (and fix some bugs in) the Windows GUI Console
* change location of gprologvars.bat under Windows (in install directory)
* increase default stack sizes (32Mb for heap, 16Mb for others)
* change the default setting for flag strict_iso: it is on now
* add control constructs to the predicate table
* modify predicate_property/2 (built_in_fd ==> built_in, add control_construct)
  only accepts a Head (a callable) (no longer a predicate indicator)
* fix a bug in the compiler (bad unification with singleton variable)
* fix a bug with strict_iso flag (was not passed to consult)
* add shebang support using #!/usr/bin/gprolog --consult-file
* modify the mangling scheme for future module support (see hexgplc)
* fix write_term default options (now numbervars(false) and namevars(false))
* fix read/1: tab and newlines are not accepted inside single/back/double quoted tokens
* add additional errors to compare/3 and keysort/2
* accept space under the top-level (same as ;)
* modify portray_clause/1-2 to add a newline at the end of the output
* add acyclic_term/1 (compatibility only since GNU Prolog does not handle cyclic terms)
* fix write/1 to treat '$VARNAME'(Atom) as a var name only if Atom is a valid var name
* rename evaluable functor atan/2 as atan2/2 and >< as xor
* add evaluable functor div/2
* detect op/3 error cases for | [] {}
* replace type_error(variable, X) by uninstantiation_error(X) (e.g. open/3-4)
* add built-in term_variables/2-3 and subsumes_term/2
* add some type tests on chars and codes (in number_chars/2, number_codes/2,..)
* fix some little bugs in the parser
* add meta_predicate property to predicate_property/2
* fix a memory leak in atom_concat/3 (in case of failure)
* add infix operator '|' (and allow it to be unquoted in read/write)
* improve top-level variables display adding () when needed
* support the ISO multifile/1 directive
* add built-ins false/0 and forall/2
* detect an instantiation_error in phrase/2-3
* allow rounding functions to accept an integer if strict_iso is off
* group all examples under a new directory 'examples'
* fix a bug in read_from_codes/2 and number_codes/2
* improve speed of built-in predicates on list (append, member, reverse,...).
* improve CTRL+C handling under the top-level
* add is_list/1 (same as list/1)
* add Prolog flags: dialect, home, host_os, host_vendor, host_cpu,
  host, arch, version, version_data, unix, argv
* add preprocessor directives if/1 else/0 elif/1 endif/0
* fix a bug on large ints in the byte-code for 64-bits machine
* fix a bug with call/2-N
* change listing/0-1 printing stream: now it is current_output
* add a new stream alias: user_error associated to stderr
* add evaluable functors: (a)sinh/1, (a)cosh/1, (a)tanh/1
* add evaluable functors: epsilon/0, lsb/1, msb/1, popcount/1
* fix compilation problem under Mac OS X Snow Leopard (force 32-bits mode)
* add evaluable functors: log/2, gcd/2, tan/1, atan2/2, pi/0, e/0
* add built-in ground/1
* rename built-in sort0 as msort
* add new error detection for keysort
* accept (but ignore) directive encoding/1
* add xor/2 (bitwise XOR) ^/2 becomes integer exponentiation
* improve randomize/0 (more different values on consecutive calls)
* relax the lexer to also accept 0'' (ISO requires 0''' or 0'\') is strict_iso is off
* fix a bug with top-level options --entry-goal and --query-goal

Change in GNU Prolog version 1.3.1:

* add working sigaction detection to detect fault addr (e.g. Mac OS X)
* add gplc option --no-mult-warn
* add prolog flags suspicious_warning, multifile_warning
* detect integer underflow/overflow in the parser
* fix a memory leak in catch/3
* increase limits (MAX_VAR_NAME_LENGTH=1024 and MAX_VAR_IN_TERM=10240)
* add PL_INT_LOWEST_VALUE and PL_INT_GREATEST_VALUE to gprolog.h
* prefix all global symbols, constants and types with Pl_ PL_ Pl
* fix a bug in the byte-code due to new max number of atoms
* provide a minimal gprolog.h
* detect if struct sigcontext needs asm/sigcontext.h on linux
* modify gplc: --c-compiler also sets linker and --linker added
* port to x86_64/bsd - many thanks to:
  David Holland <dholland@netbsd.org>
* fix problem using ebx as global reg (bug in gcc 4.3.2)
* fix a bug in is/2 with [X] (X should only be an integer)
* fix a bug with atoms '/*' '*/' and '%' (were not quoted)
* increase maximum number of atoms to 1048576 (2^20)
* increase default stack sizes (16Mb for heap, 8Mb for others)
* fix stack alignment for x86_64/Solaris
* include patch from Paul Eggert <eggert@cs.ucla.edu> for sparc/solaris8
* port to x86_64/Solaris - many thanks to:
  Scott L. Burson <Scott@coral8.com>
* fix a bug in arithmetics (mod)
* fix a bug in the FD solver (under 64 bits machines)

Change in GNU Prolog version 1.3.0:

* official release (Jan 4 2007)
* change error messages emitted by the compiler to follow GNU standards
* modify doc (mainly rename manual.xxx to gprolog.xxx)
* add DESTDIR variable support in main Makefile for staged installs
* fix a bug with Prolog floats in x86_64/linux (bad stack alignment)
* port for ix86/darwin (Mac OS X)
* add check target to main Makefile
* improve Win32 ports (cygwin, MinGW, MSVC 6.0 and 2005 Express Edition)
  (MSVC port uses MinGW as.exe instead of nasm.exe - named mingw-as.exe
   provided in the setup.exe)
* rename call/2 to call_det/2
* implement call/2-11 as will be defined in the next standard
* fix various problems when compiling with gcc 4 (gcc 4.1.1)
* emit .note.GNU-stack to mark the stack as no executable
  in x86_any.c, x86_64_any.c and powerpc_any.c
* change the way objects are found (obj_chain.c) using gcc ctors
* use Doug Lea malloc for OpenBSD (problem with malloc using mmap)
* fix problems in various ports:
  alpha/linux, powerpc/darwin (Mac OS X), sparc/solaris, ix86/OpenBSD

Change in GNU Prolog version 1.2.19:

* fix 2 bugs in global variables

Change in GNU Prolog version 1.2.18:

* fix problem when compiling with gcc 3.4.0
* fix bug in term comparison involving negative integers
* add consult, ... and fix minor bugs in the Win32 GUI console menu
* fix the stack overflow detection under cygwin
* port to ix86/MinGW - many thanks to:
  Cesar Rabak <csrabak@ig.com.br>
* fix a problem in the port to x86/OpenBSD
* port to sparc/NetBSD and powerpc/NetBSD - many thanks to:
  Jason Beegan <jtb@netbsd.org>
* fix a bug in =../2 involving FD variables
* fix a bug in arithmetics (in float_{integer/fractional}_part)
* fix a bug in FD solver (wrong union with a singleton)

Change in GNU Prolog version 1.2.17:

* change configure.in: by default ebp is not used
* fix a but with CTRL+C handler not reinstalled
* fix a bug with _XXX (re)displayed under the top-level
* port to x86_64/linux - many thanks to:
  Gwenole Beauchesne <gbeauchesne@mandrakesoft.com>

Change in GNU Prolog version 1.2.16:

* official release (Oct 1 2002)
* fix bug in predicate_property/2
* add new built-in fork_prolog/1 and create_pipe/2
* fix a bug in atom_concat/3
* fix bug when detecting if a stream can be repositioned

Change in GNU Prolog version 1.2.15:

* fix bug in output to constant terms (e.g. write_to_atom/2)
* include another additional patch for sockets under win32 - due to:
  Brent Fulgham <brent.fulgham@xpsystems.com>
* fix bug in bagof/3 with FD variables
* fix bug with randomize/0

Change in GNU Prolog version 1.2.14:

* added min/max to Prolog arithmetics
* fix bugs in current_predicate and predicate_property

Change in GNU Prolog version 1.2.13:

* official release (Jun 14 2002)
* port to powerpc/Darwin (Mac OS X) - many thanks to:
  Lindsey Spratt <spratt@alum.mit.edu>
* fix bug in Win32 GUI console (deal with edit control text limit)
* fix bug with in-place installation procedure
* fix problem with portray_clause/2 using $VARNAME and $VAR
  now portray_clause((p(Z):-p('$VARNAME'('A'),Z))) is ok
* fix bug with stream buffering (open/4 and set_stream_buffering/2)
* add stream mirror facility (see add_stream_mirror/2)

Change in GNU Prolog version 1.2.12:

* improve global vars (arg. selector, automatic array, new built-ins)
* fix two bugs with Ctrl+C reentrency under the top-level
* added priority/1 option to write_term to specify starting priority
* now under the top-level, _XXX variables are not displayed
* fix bug in decompose_file_name/4 (tried to modify read-only string)
* now open/4 better detects if a stream can be repositioned
* add source reader facility (built-in) - not yet documented
* fix current_predicate bug, now current_predicate(nl/0) fails
* fix linedit bug in tab pasting and add Esc-Tab function
* now linedit goes to EOL at CR to fix bug with multi-line inputs
* now linedit avoids to put in history 2 same consecutive lines
* remove max_stream limitation (the Prolog flag no longer exists)
* the template of get_print_stream/1 is now ?stream
* patch to allow more than 64Mb for the stacks under ix86/linux
* fix a bug in wam2ma (hexa name creation overflowed malloc buffer)

Change in GNU Prolog version 1.2.11:

* fix a problem under sparc/solaris using mmap (adding MAP_FIXED)
* fix a problem with gcc 3.0.x which always uses ebp in main()
* use -march=xxx gcc option instead of -mxxx for ix86

Change in GNU Prolog version 1.2.10:

* gplc now passes -L option to ld in the order of apparition
* gplc accepts meta-characters %p, %d,... in output file names
* include additional patch for sockets under win32 - due to:
  Brent Fulgham <brent.fulgham@xpsystems.com>

Change in GNU Prolog version 1.2.9:

* re-write Windows GUI Console in pure Win32 (no more MFC)
* adapt configure.in to work with autoconf 2.52
* add Prolog flag back_quotes and values {atom,chars,codes}_no_escape
* use a terminal recusion in FD arithmetic normalization
* fix bug in bind_variables/2, reported by:
  Bowie Owens <owe043@phi-cq.vic.cmis.csiro.au>
* modify Ma2Asm mappers to use Y_OFFSET (from ENVIR_STATIC_SIZE)
* fix some bugs in the Wam debugger
* add several options to the top-level to execute goals
* add an environment variable LINEDIT to control linedit options
* fix bug in linedit on \b in start of line (using ANSI ESC sequences)
* simplify linedit: only apply to stdin
* now linedit is reentrant
* now linedit works with XFree keyboard encoding
* rename built-in get_code_no_echo/1-2 by get_key_no_echo/1-2
* add built-in get_key/1-2
* use get_key/1-2 in the top_level + debugger (thus with echo)
* improve the top-level Ctrl+C manager
* fix bux on linux configured with --disable-regs
* add pipe to pl2wam stdin when called by consult/1
* fix bug in FD: forall is now recognized in .fd files
* fix bug in DCG: expand_term((a --> X), Y) is OK
* fix X paste problem in linedit
* simplify top_comp.c to better control include dirs in devel. mode
* specialized functions for create/update/delete choice points
* fix a bug in wam2ma (hexa name creation overflowed malloc buffer)
* include patch to support basic sockets under win32 - due to:
  Brent Fulgham <brent.fulgham@xpsystems.com>
* arithmetic functions and inlined built-ins use fast call
* specialized functions for switch_on_term_xxx
* modify pl2wam to generalize '$call_c' (add options)

Change in GNU Prolog version 1.2.8:

* official release (Oct 15 2001)
* fix bug - delete file created by mkstemp(2), patch from:
  Salvador Abreu <spa@debian.org>
* space_args(true) now displays a space inside {}/1
* space_args(true) now displays a space after a comma (','/2)

Change in GNU Prolog version 1.2.7:

* add a --foreign-only option to pl2wam
* foreign/2 directives are ignored in byte-code mode (no fatal error)
* space_args(true) now displays space between operators and arguments
* add CVS Id to prolog files
* get rid of mktemp and tempnam calls (use mkstemp if available)
* fix bug in pl2wam to include break/0, trace/0,... in bip_list.pl
* fix a bug in fd_element_var/3 constraint
* fix bug in fd headers (fd_to_c.h not installed)
* fix a bug with unify_with_occurs_check/2
* fix bug on ix86 using ebp (add -fomit-frame-pointer in CFLAGS_MACHINE)

Change in GNU Prolog version 1.2.6:

* fix a bug with ! in dynamic code
* fix a bug in arithmetics

Change in GNU Prolog version 1.2.5:

* big modification (1 month) to optimize the execution speed

Change in GNU Prolog version 1.2.4:

* implement fast call (mainly for WAM functions)
* modify C->Prolog foreign interface to recover arguments space
* improve dynamic clause management and fix a bug (memory leak)
* fix _ symbol prefix problem for Free BSD
* no longer use dl_malloc on Linux but prevent MMAP using mallopt

Change in GNU Prolog version 1.2.3:

* added acos/asin to Prolog arithmetics
* full re-indentation of the sources for CVS

Change in GNU Prolog version 1.2.2:

* port to alpha/linux - many thanks to: Alexander Diemand <ax@apax.net>
* port to alpha/OSF1
* port to mips/irix - many thanks to: Alexander Diemand <ax@apax.net>
* fix a bug in stty.c (use standard termios if present)

Change in GNU Prolog version 1.2.1:

* fix a bug in stty.c (use termio by default and else termios)

Change in GNU Prolog version 1.2.0:

* official release (Jul 28 2000)

Change in GNU Prolog version 1.1.7:

* port for ix86/NetBSD - many thanks to: Brook Milligan <brook@nmsu.edu>
* more customizable configuration/installation procedure

Change in GNU Prolog version 1.1.6:

* start of native Win32 port
* added creation/1 and last_access/1 property to file_property/2
* fix a bug in the compiler about \\ inside quoted atoms
* fix a bug in dynamic clause retraction (memory leak)
* fix a bug in atom management (existing atoms eat mallocated space)
* avoid to establish a connection at start to get the hostname
* rename configuration file config.h by gp_config.h

Change in GNU Prolog version 1.1.5:

* internal version

Change in GNU Prolog version 1.1.4:

* fix a bug in the byte-code loader (bad realloc computation)
* fix a bug in the malloc (used MMAP under linux)

Change in GNU Prolog version 1.1.3:

* port for ix86/SCO - many thanks to:
  Clive Cox <clive@laluna.demon.co.uk> and
  Edmund Grimley Evans <edmundo@rano.demon.co.uk>)
* port for ix86/solaris - many thanks to:
  Andreas Stolcke <stolcke@speech.sri.com>
* fix a bug in the FD solver for X#\=C (if C is max(X))
* fix a bug with directory_files/2 (too many open files)

Change in GNU Prolog version 1.1.2:

* official release (Nov 29 1999)
* fix a bug in the scanner about 0'<character>
* fix a bug in the compiler about \t in quoted atoms

Change in GNU Prolog version 1.1.1:

* fix bug with popen/3
* update machine.c for struct sigcontext under Linux

Change in GNU Prolog version 1.1.0:

* official release (Oct 4 1999)
* fix a bug in the output of some extended characters in native-compilation

Change in GNU Prolog version 1.0.6:

* fix a bug in sign/1 for arithmetic evaluation
* implementation of call_with_args

Change in GNU Prolog version 1.0.5:

* fix a bug in foreign C calling Prolog on sparc

Change in GNU Prolog version 1.0.4:

* fix a bug with sparc compilation

Change in GNU Prolog version 1.0.3:

* a first final port for cygwin (see PROBLEMS)
* fix some bugs in the FD solver
* fix some other bugs

Change in GNU Prolog version 1.0.2:

* fix precision bug on floating constants

Change in GNU Prolog version 1.0.1:

* add ensure_linked directive
* fix known bugs under RedHat 6.0 usgin egcs
* port for PowerPC / GNU/Linux

Change in GNU Prolog version 1.0.0:

* official release (Apr 16 1999)
* rewrite DCG in C (unification optimized, avoid ill-balanced conjunctions)
* fix known bugs

Change in GNU Prolog version 0.9.0:

* Calypso becomes GNU Prolog
* in-place installation facility
* fix compiler bug
* rewrite sorts built-in predicates and add in-place sorts predicates
* rewrite DCG translation
* rewrite all solutions built-in predicates

Change in Calypso version 1.0-beta7:

* use autoconf
* fix known bugs
* add :- built_in/0-1 and :- built_in_fd/0-1 directives
* complete C foreign interface

