# Ann: SWI-Prolog 9.1.9 **URL:** \ **Category:** Releases\ **Created:** [April 29, 2023, 2:30pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-1-9/6507 "2023-04-29T14:30:36Z")\ **Posts on this page:** 1\ **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:** [April 29, 2023, 2:30pm UTC](https://swi-prolog.discourse.group/t/ann-swi-prolog-9-1-9/6507/1 "2023-04-29T14:30:36Z")
Dear SWI-Prolog user, SWI-Prolog 9.1.9 is ready for download. This is mostly a bugfix and portability release. Highlghts: - @peter.ludemann has done a lot of work on the second incarnation of the C++ interface, mostly making exception handling more C++ friendly. There are still some open issue wrt representing the exception and support for character encodings. - Some more fixes to Windows file handling. - Fix to abolish/1 followed immediately by asserting new facts could lead to a permission error due to a race condition between the GC thread and the abolishing thread. - print\_term/2: better handling of compound terms with long functors. # SWI-Prolog Changelog since version 9.1.8 - DOC: limitation of PL\_record\_external() with blobs - ADDED: library(main) cli flag processing for debugging. See cli\_debug\_opt\_type/3 and friends. - ADDED: argv\_options/4: typed `directory` and `directory(+Access)`. - ADDED: print\_term/2: option auto\_indent\_arguments(Int) With this option (defaults to 4), dicts and compounds that are too wide ands whose funtor is at least twice this width, have their arguments printed on the next line. - PORT: When using `-DSTATIC_EXTENSIONS=ON`, drop usage of dlopen() This is required for recent versions of Emscripten that give a runtime error on the usage of dladdr(). - TEST: Added test for #1168 - FIXED: Issue#1168: race condition betweem abolish and CGC Clause Garbage Collection concurrent with abolish/1 could leave the predicate with erased clauses while it was not marked dirty. As a result, a subsequent attempt to assert/1 to this predicate results in an error trying to amodify a static predicate. Reported by Paulo Moura. - TEST: Create a new test directory to improve concurrency while testing. - ADDED: Issue#1019: PL\_put\_wchars(). - TEST: Fix and disable some tests when running under Wine. - PORT: Demand C11 early - DOC: Document issues with standard order on rational trees. - DOC: Issue#1164: clarify `answer_write_options` flag. - DOC: Prolog flag `toplevel_residue_vars`. - FIXED: Addresses #1160, residual constraints in tuples\_in/2 from clp(fd). Patch by @triska for Scryer Prolog. - FIXED: Windows exists\_file/1 and exists\_directory/1 domain error. Avoid `Domain error: `foreign_return_value' expected, found `-1'`. Document that invalid names cause silent failure. - MODIFIED: statistics/2 `cputime` and `infereneces` to include completed “child threads”. This patch causes threads to keep track of their “creator” thread. If the creator still exists when a thread dies, the time and inferences are recorded with the creator and reflected in the statistics keys. The new keys `self_cputime` and `self_inferences` provide the original. - BUILD: When using `-DSTATIC_EXTENSIONS=ON`, do not install the libraries. This implies plugins are not installed as `*.a` files and `libswipl.a` is not installed. Only `bin/swipl` and the Prolog libraries and support files are installed. - FIXED: swipl.cmake syntax error ## Package archive - TEST: Disable write tests under Wine. These tests work fine under Windows. ## Package clib - ENHANCED: prolog\_server/2: if tcp\_host\_to\_address/2 raises an exception or fails, just use the Peer in the thread alias, rather than having the server thread die ## Package cpp - DOC: Fixed LaTeX errors and duplicate conclusion section. - ENHANCED: C+±compatible exception handling + more wrapper functions and classes SWI-cpp2-plx.h contains wrapper functions (imported from SWI-cpp2.h) - throw PlException for Prolog errors - most SWI-Prolog.h functions have a wrapper. verify() methods removed from PlAtom, PlTerm, etc. - the wrapper functions do the checking. Some executable code has been moved to SWI-cpp2.cpp - can be inlined, if desired. PlException is now a subclass of std::exception, not a subclass of PlTerm. PlTypeError, PlDomainError, etc. are no longer subclasses of PlTerm, but are functions for creating suitable PlException objects. The string comparison operators are deprecated; use as\_string() and std::string comparison instead, which allows specifying the encoding. Added PlRecord, PlRecordExternal, PlControl (used by PREDICATE\_NONDET), PlStream. Fixed numerous bugs and misfeatures; added tests. - TEST: Do not build and link the tests when building with STATIC\_EXTENSIONS ## Package http - MODIFIED: reply\_json\_dict/2 to explicitly use UTF-8 by default. Where the other reply\_json variants used `application/json; charset=UTF-8`, reply\_json\_dict/2 used only `application/json`. This is fine according to the standards, but some clients insist on the charset. Ths patch makes all versions compatible. - FIXED: library(http/http\_log): exception when logging was disabled. Harmless as the exception was printed but otherwise ignored. ## Package semweb - ADDED: rdfe\_load/2: accept .nt (N-Triples) files. ## Package sgml - ADDED: the `atom` transformation to the attribute value in xpath. The content attributes provided with `load_structure/3` can be atoms or strings depending on the `attribute_value/1` option. So adding a transformation of attribute values to an atom in `xpath/3` should be a useful feature, such as `string` transflation. ## Package swipl-win - PORT: Changes for SWI-cpp2.h version 2 ## Package xpce - PORT: Add function prototypes. - PORT: migration of regex library to ANSI C prototypes - PORT: Convert gitwrite.c code to ANSI C. - FIXED: directory-\>scan existence checking.