# Ann: SWI-Prolog 9.2.8 (stable) **URL:** \ **Category:** Releases\ **Created:** [October 24, 2024, 7:30am UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-2-8-stable/8556 "2024-10-24T07:30:29Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![jan](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/jan/32/4_2.png) [@jan](https://swi-prolog.discourse.group/u/jan)\ **Post date:** [October 24, 2024, 7:30am UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-2-8-stable/8556/1 "2024-10-24T07:30:29Z")
Dear SWI-Prolog user, SWI-Prolog 9.2.8 (stable) is ready for download. It provides a large number of backports from the development series, dealing with portability, stability and license issues. It also provides some isolated new features to simplify “forward compatibility”. ``` Enjoy --- Jan ``` # SWI-Prolog Changelog since version 9.2.7 - BUILD: Make sure to clear `DISPLAY` when running xpce steps While the build works without a DISPLAY variable, an invalid variable causes the build to fail. - TEST: Disable collation\_key/2 test for MacOS Macos Sequoia (15) wcsxfrm() returns garbage. - FIXED: Avoid corruption in setjmp()/longjmp() Clang demands using a volatile variable for protecting the throw environment’s parent. This is probably correct, although it seems weird to place this variable in a register. - ENHANCED: Add Prolog navigator to `theme/dark.pl` - FIXED: expand\_term/2 to succeed twice when expanding a toplevel list. Results in duplicate clauses when compiling `[f(1), f(2)].`. Reported by Uwe Neumerkel. - FIXED: pack management: find available versions from wildcard URL. Patch by Nicos Angelopoulos - PORT: Added FreeBSD signal names to the name/number map. Contributed by Dewayne Geraghty - ENHANCED: file\_autoload\_directives/3: deal with library(main) hooks. - ADDED: PL\_print\_message() for calling print\_message/2 from C - FIXED: print\_term/2: indentation of right argument of infix term. - FIXED: Allow breakpoints in arg(C,T,F) I.e., arg/3 calls with a known argument and the 3th index being a _first var_. These map to the `B_ARG_CF` VM instruction. - DOC: Added documentation for PL\_for\_dict() - FIXED: Windows format\_time/3 implementation for time stamps \> 32 bits. While the Windows `time_t` is 64 bits, it doesn’t seem to localtime() seems broken handling large time offsets. - ADDED: date\_time\_stamp/2: allow leaving components unbound from the right. - DOC: #1323 Wrong claim on default for `prefer_rationals` flag. - ADDED: is\_message\_queue/1 to test the existence of a message queue. - FIXED: pack\_publish/2 reporting (claimed failure) - ADDED: `swipl pack publish --server=URL ...` Allows publishing at an alternative server. - FIXED: Package manager, `swipl pack publish .` Broken detection of git directory and failure do deal with - FIXED: Possibly memory leak in LibBF arithmetic A thread race condition may lead to loosing cache values from get\_trig(). Fixed using C11 atomics. - FIXED: Use stack variable after return for LibBF bignums This leads to incorrect results and crashes when using really big bignums. The LibBF bignum implementation is by default used for the WASM version and the MacOS binaries. - ENHANCED: install\_pack/1,2 to prefer https over http for downloading. Unless `insecure(true)` or `swipl pack install -k ` is given, possible HTTP links are automatically rewritten to HTTPS. - ENHANCED: pack\_install/1: warn if files are downloaded over HTTP - MODIFIED: argv\_options/3: with type (bool|sometype) We now consider the option boolean unless written as `--opt=value` Before, the option was considered boolean if it was the last argument or the next argument started with a `-`. - FIXED: argv\_options/3 handing of `boolean|Type` on last option - ENHANCED: Arithmetic performance. This patch reverts 18d5d539af0807808ba6fee6ec66394aaec589f1 except for clang as it does cause a significant slowdown on some systems. - PORT: Call gettid via its glibc wrapper if possible - LEGAL: Resolved license issues for dialect/xsb/basics.pl Hi Jan, As the coder of a number of (but by no means all) the predicates in XSB’s basics.P, I’m perfectly fine with you releasing under the BSD-2 license. Regarding the issues with XSB’s licenses, we’ll have to consider it and come to some decision. Best, -David - DOC: Updated limits section - DOC: Update 32/64 bit notes - FIXED: #1317 thread\_exit/1 can crash after changes to thread\_signal/2. - FIX: include stdbool ## Package cpp - TEST: Fixed file tests for Windows where Prolog and OS paths differ, - FIX: add missing PlStringBuffers in calls to PL\_chars(), PL\_nchars(), PL\_wchars() - DOC: adding warning to PlTermv - DOC: Added C++ version of foreign.doc’s calc.c example - MODIFIED: Return type wrappers changed to `bool`, matching SWI-Prolog.h This matches the changes in SWI-Prolog.h with commit a1e914f - DOC: added blob example (wrapped pointer) - ENHANCED: PlTerm::get\_file\_name() returns std::string ## Package http - COMPAT: Support both old and new abort exception - FIXED: http\_reply\_file/3: be more tolerant about if-modified-since Recent systems provided file times in sub-second, while HTTP typically looses this. - FIXED: Steadfastness of http\_timestamp/2 - ADDED: http\_parse\_header\_value/3: support `expires` For compatibility, this is not converted by default. - ADDED: http\_timestamp/2: support mode (-,+), i.e., parsing - ADDED: Allow for throw(http\_reply(hangup)) to simply hangup the line. This is not a valid reply, but can be used to quickly terminate connections as well as for testing error scenarios. ## Package semweb - FIXED: Make RDF GC thread stop gracefully. - COMPAT: Support both old and new abort exception ## Package sgml - DOC: xsd\_time\_string/3 XSD strings in table were wrong. ## Package swipy - DOC: Python signal handling - ADDED: janus.heartbeat() to make Python process interrupts while Prolog runs. - ADDED: propagate keybaord interrupt. - ENHANCED: Cooperate with Python sys:exit() Calls from Prolog to Python, where Python raises a SystemExit() exception are mapped to Prolog unwind(halt(Status)) exceptions or, for older versions into abort/0, recording the exit status requested. Consisently, when control comes back from Prolog to Python, the unwind(halt(Status)) raises SystemExit(Status) or, abort with recorded exit status raises this Python exception. - PORT: Avoid compiler warnings on 32 bit platforms ## Package xpce - ENHANCED: #38 Support themes in navigator. - FIXED: #38 Avoid loading the GUI tracer when trace/util.pl is loaded. The navigator loads this, but should not load the GUI debugger itself. - FIXED: Class tabbed\_window: avoid sending -\>resize\_window when freed. - COMPAT: PceEmacs: implemented `C-x 5 2` and `M-,` - FIXED: Pass on unwind() exceptions from e.g. timer events calling Prolog. - ADDED: GUI tracer term viewer: allow pinning. - ADDED: PceEmacs Prolog mode: auto-fill the mode line properly. - COMPAT: Support both old and new abort exception - ADDED: Configure how the GUI tracer behaves if another threads hits it. The default now is to block such threads. Alternatively it may be set to `nodebug`, meaning the thread continues in nodebug mode or `trace`, meaning it opens a secondary trace window. The latter is how it used to work. - FIXED: Argument indentation on next line - ADDED: PceEmacs: Indent dict values relative to the key when on next line - FIXED: PceEmacs language\_mode\<-argument\_indent Should fail if there is no argument. - ADDED: Allow disabling the message capturing popup for the session. - SCALE: Predicate browser of profile/1 GUI. - LEGAL: Resolved license issues wrt xdnd.[ch] by Paul Sheer (LGPL) This turns xpce on X11 effectively into LGPL. On Windows, this code is not used and thus BSD-2 is effective. - FIXED: Types for AllocColor - PORT: Changed XPM Windows emulation from K&R to ANSI C Modified using [GitHub - license-fn/un-obsolize: Convert obsolete (K&R) C function declarations and definitions to ANSI equivalents.](https://github.com/license-fn/un-obsolize.git) - FIX: conflicting declarations noticed only by clang (not gcc) ---
**Author:** ![mgondan1](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/mgondan1/32/803_2.png) [@mgondan1](https://swi-prolog.discourse.group/u/mgondan1)\ **Post date:** [October 27, 2024, 7:47pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-2-8-stable/8556/2 "2024-10-27T19:47:44Z")
Updated on MSYS2, all tests pass. 🔊 📢 📣 📯 🔔 🎼 🎵 🎶 🎤 🎧 🎷 🪗 🎸 🎹 🎺 🎻 🪕 🥁