Below are the changes for the current release. See the CHANGES file for changes in older releases. See the RELEASENOTES file for a summary of changes in each release. Issue # numbers mentioned below can be found on Github. For more details, add the issue number to the end of the URL: https://github.com/swig/swig/issues/ Version 4.1.0 (in progress) =========================== 2022-10-24: wsfulton [R] Add support for special variable replacement in the $typemap() special variable macro for R specific typemaps (rtype, rtypecheck, scoercein, scoereout). 2022-10-24: wsfulton [R] Polymorphism in the wrappers was only working for C++ classes, now this works for C++ structs too. 2022-10-19: olly [Lua] #2126 Fix type resolution between multiple SWIG-wrapped modules. 2022-10-17: wsfulton [R] #2385 Add support for std::vector>. 2022-10-14: murillo128 [Javascript] #2109 Tweak unsigned long and unsigned long long typemaps to create a v8::Number instead of v8::Integer if the value exceeds the size of v8::Integer. Note that the v8::Number value will be imprecise if the value is > MAX_SAFE_INTEGER. 2022-10-14: olly [R] Arrange that destructors of local C++ objects in the wrapper function get run on SWIG_fail (which calls Rf_error() which calls longjmp()). 2022-10-14: olly [Lua] Arrange that destructors of local C++ objects in the wrapper function get run on SWIG_fail (which calls lua_error() which calls longjmp()). 2022-10-13: wsfulton [R] Add missing SWIGTYPE *const& typemaps for supporting pointers by const reference. 2022-10-10: wsfulton #2160 Fix compile error when using templates with more than one template parameter and used as an input parameter in a virtual method in a director class (problem affecting most of the scripting languages). 2022-10-10: treitmayr, wsfulton [Python, Ruby] #1811 #1823 Fix invalid code generated in some cases when returning a pointer or reference to a director-enabled class instance. This previously only worked in very simple cases, now return types are resolved to fix. A bug in template instantiations using pointers also works now. 2022-10-06: wsfulton [CFFI] #1966 #2200 Remove code for Common Lisp CFFI. We dropped support for it in SWIG 4.0.0 by disabling it as the first stage. This is the final stage for complete removal as there has been no meaningful progress to revive it to the status of experimental language. 2022-10-06: olly [Python] #2390 Remove deprecated and apparently useless defarg.swg The only documentation is in the file itself and describes a Python wrapper around the C function defined here, but digging though the git history this Python wrapper doesn't seem to have ever actually been generated by SWIG. This file was also marked as deprecated in 2005. 2022-10-06: wsfulton [Java] #2048 Fix quoting for doxygen \image command to quote the output file name generated into the html src attribute. 2022-10-05: benjamin-sch [Python] added an interpreter counter to fix deinitialization issues if multiple subinterpreters are used 2022-10-05: olly, wsfulton #672 Add support for parsing C++11 final classes such as: class X final {}; This no longer gives a syntax error. 2022-10-05: wsfulton [OCaml] Fix %rename for enum items. Previously the rename had no effect. 2022-10-05: olly #1465 Report errors in preprocessor expressions by default Until now SWIG quietly ignored such errors unless -Wextra (or -Wall which implies -Wextra) was passed, but this is unhelpful as it tends to hide genuine problems. To illustrate this point, enabling this warning by default revealed a typo in the preproc_defined.i testcase in SWIG's own testsuite. If you really don't want to see this warning, you can suppress it with command line option -w202 or by using this in your interface file: %warnfilter(SWIGWARN_PP_EVALUATION); Both will work with older versions of SWIG too. 2022-10-04: olly #1050 Consistently define SWIG_VERSION both at SWIG-time and in the generated wrapper. Best practice remains to check at SWIG-time where possible because that results in smaller generated wrapper sources. SWIGGO and SWIGJAVASCRIPT are now defined in the generated wrappers to match behaviour for all other target languages. The undocumented SWIGVERSION macro is no longer defined. 2022-09-29: olly #2303 SWIG's internal hash tables now use a better hash function. The old hash function only considerd the last five characters plus the least significant bit of the last-but-sixth character, which as you might guess generated a lot of many-way collisions. This change seems to give about a 4% reduction in wallclock time for processing li_std_list_wrap.i from the testsuite for Python. The hash collision rate for this example drops from 39% to 0! 2022-09-29: wsfulton #2303 Type tables are now output in a fixed order whereas previously the order may change with any minor input code change. This shouldn't affect users except SWIG_TypePrettyName may output a different C/C++ typedef to a type - it's used mostly for showing errors when the type passed to a function is wrong. 2022-09-29: olly [PHP] Dynamic class properties are no longer supported by default. Historically PHP has supported dynamic class properties and SWIG has implemented them too (because we implement the magic __get(), __set() and __isset() methods we need to include explicit handling). PHP 8.2 deprecates dynamic class properties - initially they'll warn, and apparently they'll not work by default in PHP 9.0: https://wiki.php.net/rfc/deprecate_dynamic_properties In PHP code dynamic properties can be enabled for a class by marking that class with the attribute `#[AllowDynamicProperties]`. To follow this PHP change, in SWIG you now need to specify `%feature("php:allowdynamicproperties", 1) Foo;` (or `%feature("php:allowdynamicproperties", 1)` to enable it for all wrapped classes). Unknown features are ignored, so you can add it unconditionally and it'll work with older SWIG too. *** POTENTIAL INCOMPATIBILITY *** 2022-09-19: wsfulton #1484 Fixes for class inheritance with the same name in different namespaces such as: namespace A { class Bar {}; } namespace B { template class Bar : public A::Bar {}; } 2022-09-19: wsfulton #2316 Remove swig.spec file and srcrpm makefile target. These are very out of date and don't seem to be used by RPM based Linux distributions which have their own version of swig.spec. 2022-09-17: wsfulton [Go, Guile, Racket, Scilab] Add throws typemaps for std::string so that thrown string exception messages can be seen. 2022-09-17: wsfulton [Racket] Add throws typemaps for char * so that thrown string exception messages can be seen from Racket. 2022-09-17: wsfulton [Javascript, Octave, R] Improve exceptions for %catches and exception specifications for native types. String exception messages are shown as the exception message instead of just the type of the exception. 2022-09-17: wsfulton Add missing typecheck typemaps for std::auto_ptr and std::unique_ptr to fix overloading when using these types. 2022-09-17: wsfulton [Guile] Add error checking to SWIGTYPE and SWIGTYPE & in typemaps to prevent seg faults when passing #nil to these parameter types. 2022-09-16: wsfulton #999 Provide SWIGTYPE MOVE typemaps in swigmove.i for implementing full move semantics when passing parameters by value. 2022-08-31: wsfulton #999 Improve move semantics when using rvalue references. The SWIGTYPE && input typemaps now assume the object has been moved. These typemaps have been changed assuming that after the function call, the rvalue reference parameter has been moved. The parameter's proxy class that owns the C++ object thus has the underlying pointer set to null so that the (moved from, but still valid) C++ object cannot be used again and the object is additionally deleted. *** POTENTIAL INCOMPATIBILITY *** 2022-08-28: wsfulton [Octave] SWIG now marshals a C/C++ NULL pointer into the null matrix, []. SWIG has always marshalled the null matrix into a NULL pointer; this remains and now we have consistency in representing a NULL pointer. 2022-08-26: wsfulton [Racket] SWIG now marshals a C/C++ NULL pointer into a null value by calling scheme_make_null(), so that scheme's null? is true for a NULL C/C++ pointer value. 2022-08-18: wsfulton [Racket] Add support for std::unique_ptr in std_unique_ptr.i. Add support for std::auto_ptr in std_auto_ptr.i. 2022-08-13: wsfulton [Guile] Add support for std::unique_ptr in std_unique_ptr.i. Add support for std::auto_ptr in std_auto_ptr.i. 2022-08-11: wsfulton [Lua] Add support for std::unique_ptr in std_unique_ptr.i. Add support for std::auto_ptr in std_auto_ptr.i. 2022-08-05: wsfulton [D] Fix occasional undefined behaviour with inheritance hierarchies, particularly when using virtual inheritance as the pointers weren't correctly upcast from derived class to base class when stored in the base's proxy class. 2022-08-05: wsfulton [D] Add support for std::unique_ptr in std_unique_ptr.i. Add support for std::auto_ptr in std_auto_ptr.i. 2022-08-03: wsfulton [Javascript] Add support for std::unique_ptr in std_unique_ptr.i. Add support for std::auto_ptr in std_auto_ptr.i. 2022-08-02: wsfulton [Octave] Add support for std::unique_ptr in std_unique_ptr.i. Add support for std::auto_ptr in std_auto_ptr.i. 2022-08-01: wsfulton [Python] Add initialisers for additional members in PyHeapTypeObject (builtin mode) for Python-3.11 - _ht_tpname, _spec_cache. 2022-07-30: wsfulton C++20 has deprecated std::basic_string<>::reserve() and the C++11 method std::basic_string<>::shrink_to_fit() is a replacement that can be used. std_string.i and std_wstring.i provided wrappers for reserve with the following template instantiations: %template(string) std::basic_string; %template(wstring) std::basic_string; The reserve method is no longer wrapped, however the shrink_to_fit() method can be used as an alternative from the target language (the generated wrappers call reserve() instead if C++<=20). Note that std::basic_string<>::reserve(size_t n) is still wrapped unchanged. *** POTENTIAL INCOMPATIBILITY *** 2022-07-30: wsfulton [Tcl] Add support for std::unique_ptr in std_unique_ptr.i. Add support for std::auto_ptr in std_auto_ptr.i. 2022-07-27: ZackerySpytz, olly #1678 Support parsing C++20 templated lambdas. 2022-07-27: ZackerySpytz, olly #1622 Add support for the C++20 spaceship operator (<=>). 2022-07-26: olly [Tcl] https://sourceforge.net/p/swig/bugs/977/ Fix handling of long long on 32-bit platforms. This fix raises SWIG's minimum supported Tcl version to 8.4.0 (which was released just under 20 years ago). 2022-07-26: olly Fix incorrect operator precedence in preprocessor expressions. 2022-07-25: olly Support for C++14 binary integer literals in preprocessor expressions. 2022-07-20: wsfulton [C#, Java] Ensure the order of interfaces generated in proxy interfaces for the %interface family of macros is the same as that parsed from the bases in C++. 2022-07-20: jicks, Ingener74, olly #422 [Python] Fix mishandling of a Python class inheriting from multiple SWIG-wrapped director classes. 2022-07-19: wsfulton #692 [C#, Java, Perl, Python, Ruby] std::unique_ptr and std::auto_ptr typemaps provided for inputs types in std_unique_ptr.i and std_auto_ptr.i. Now these smart pointers can be used as input parameters to functions. A proxy class instance transfers memory ownership of the underlying C++ object from the proxy class to a smart pointer instance passed to the wrapped function. 2022-07-19: jschueller [Python] #2314 Drop support for Python 3.2. 2022-07-19: olly Remove remaining support code for classic macos, which has not been supported by Apple for over 20 years now. 2022-07-12: wsfulton #999 Performance optimisation for parameters passed by value that are C++11 movable. The C++ wrappers create a temporary variable for a parameter to be passed to a function. This is initially default constructed and then copy assigned from the instance being passed in from the target language. This is unchanged, however, when the temporary variable is passed to the wrapped function, it is now done using std::move. If the type is move constructible, the move constructor will be used instead of the copy constructor. 2022-07-12: wsfulton [Perl] Add std::auto_ptr support in std_auto_ptr.i library file. 2022-07-12: erezgeva [Perl] Add std::unique_ptr support in std_unique_ptr.i library file. 2022-07-07: jmarrec #1158 #2286 Add basic support for C++11 attributes. These are now crudely ignored by SWIG's parser's tokeniser, which is better that failing with a parse error. 2022-07-05: ianlancetaylor [Go] #2245 Handle NULL pointers for string* conversions. Rearrange generation of director methods and rename receiver argument from p to swig_p. 2022-07-03: wsfulton #999 Performance optimisation for directors for classes passed by value. The directorin typemaps in the director methods now use std::move on the input parameter when copying the object from the stack to the heap prior to the callback into the target language, thereby taking advantage of move semantics if available. 2022-07-02: wsfulton #1722 [C#, Java, Python, Ruby] Add std::unique_ptr support. Ported from std::auto_ptr. Use the %unique_ptr(T) macro as follows for usage std::unique_ptr. For example, for a class called Klass: %include "std_unique_ptr.i" %unique_ptr(Klass) Support is currently limited to only returning a std::unique_ptr from a function. 2022-06-29: wsfulton #999 #1044 Enhance SWIGTYPE "out" typemaps to use std::move when copying objects, thereby making use of move semantics when wrapping a function returning by value if the returned type supports move semantics. Wrapping functions that return move only types 'by value' now work out the box without having to provide custom typemaps. The implementation removed all casts in the "out" typemaps to allow the compiler to appropriately choose calling a move constructor, where possible, otherwise a copy constructor. The implementation also required modifying SwigValueWrapper to change a cast operator from: SwigValueWrapper::operator T&() const; to #if __cplusplus >=201103L SwigValueWrapper::operator T&&() const; #else SwigValueWrapper::operator T&() const; #endif This is not backwards compatible for C++11 and later when using the valuewrapper feature if a cast is explicitly being made in user supplied "out" typemaps. Suggested change in custom "out" typemaps for C++11 and later code: 1. Try remove the cast altogether to let the compiler use an appropriate implicit cast. 2. Change the cast, for example, from static_cast to static_cast, using the __cplusplus macro if all versions of C++ need to be supported. *** POTENTIAL INCOMPATIBILITY *** 2022-06-15: wsfulton #2039 Add move assignment operator to SwigValueWrapper used by the valuewrapper feature. 2022-06-04: sethrj Enhance $typemap to support typemap attributes. $typemap(method:attribute, typepattern) For example: %typemap(cstype, out="object") XClass "XClass" %typemap(cscode) BarClass %{ $typemap(cstype:out, XClass) bar() { return null; } which expands to object bar() { return null; } 2022-05-30: wsfulton [C#, D] Add new special variable expansion: $imfuncname. Expands to the function name called in the intermediary class. 2022-05-30: LindleyF [Java] #2042 Add new special variable expansion: $imfuncname. Expands to the function name called in the intermediary class. 2022-05-28: jkuebart [Java] On some versions of Android, specifically Android 6, detaching the current thread from the JVM after every invocation causes a memory leak. Offer SWIG_JAVA_DETACH_ON_THREAD_END to configure a behaviour where the JVM is only detached in the thread destructor. See https://developer.android.com/training/articles/perf-jni#threads. 2022-05-27: xypron [Python] #2277 Define PY_SSIZE_T_CLEAN macro before #include "Python.h" as recommended in Python 3.7 and later. To avoid this macro definition, add the following to your interface file so that SWIG_NO_PY_SSIZE_T_CLEAN is defined at the beginning of the C++ wrappers: %begin %{ #define SWIG_NO_PY_SSIZE_T_CLEAN %} 2022-05-26: rokups [C#] #1323 Modify SwigDerivedClassHasMethod for a more efficient director implementation when calling virtual methods that are not overridden. 2022-05-15: erezgeva, eiselekd [Lua, Perl, Octave, PHP, Tcl] #2275 #2276 #2283 Add argcargv.i library containing (int ARGC, char **ARGV) multi-argument typemaps. Document this library in Typemaps.html. 2022-05-07: KrisThielemans [Python] Fix "too many initializers for 'PyHeapTypeObject'" errors using PyPy 3.8 and later. 2022-05-04: wsfulton [C#] Add C# wchar_t * director typemaps 2022-04-20: cminyard Fix an issue where newlines were not properly generated for godirectorin typemaps. If you have a virtual function not assigned to zero, in some cases it won't generate a newline and you will see errors: example.go:1508:3: expected ';', found swig_r when compiling the go code. Also add an example of using goin and godirectorin and add a test for this situation. 2022-04-29: jason-daly, JerryJoyce, wsfulton [C#] #1233 Add wchar_t * and std::wstring Unicode string support on Linux. 2022-04-11: robinst #2257 Fix new Ruby 3.2 warning "undefining the allocator of T_DATA class swig_runtime_data". 2022-04-07: olly #1750 SWIG now recognises and ignores Doxygen group commands `@{` and `@}`. 2022-04-06: wsfulton ./configure now enables C++11 and later C++ standards testing by default (when running: 'make check'). The options to control this testing are the same: ./configure --enable-cpp11-testing ./configure --disable-cpp11-testing But the former is now the default and the latter can be used to turn off C++11 and later C++ standards testing. 2022-04-06: wsfulton [Python] #1635 The "autodoc" feature no longer overrides Doxygen comments in the generated docstring. If a "docstring" feature is present it will still override a Doxygen comment. If the "autodoc" feature is also present, the combined "autodoc" and "docstring" will override the Doxygen comment. If no "docstring" is present then the "autodoc" feature will not be generated when there is a Doxygen comment. This way the "autodoc" feature can be specified and used to provide documentation for 'missing' Doxygen comments. *** POTENTIAL INCOMPATIBILITY *** 2022-04-01: olly Remove undocumented and non-functional -browse command line option. 2022-03-26: eltoder [Python] #1684 Use different capsule names with and without -builtin Types generated with and without -builtin are not compatible. Mixing them in a common type list leads to crashes. Avoid this by using different capsule names: "type_pointer_capsule" without -builtin and "type_pointer_capsule_builtin" with. 2022-03-25: wsfulton The debug command line options that display parse tree nodes (-debug-module, -debug-top, -debug-symtabs) now display previously hidden linked list pointers which are useful for debugging parse trees. Added new command line option -debug-quiet. This suppresses the display of most linked list pointers and symbol table pointers in the parse tree nodes. The keys in the parse tree node are now shown in alphabetical order. 2022-03-24: wsfulton #2244 Fix using declaration in derived class bugs when all the base class's overloaded methods were overridden in the derived class - fixes "multiply defined" errors. 2022-03-23: wsfulton [Python] #1779 The -py3 option is deprecated and now has no effect on the code generated. Use of this option results in a deprecated warning. The related SWIGPYTHON_PY3 macro that this option defined is no longer generated. Note that %pythonnondynamic feature generates a metaclass that works on both Python 2 and Python 3. 2022-03-21: wsfulton [Python] #1779 pyabc.i for abstract base classes now supports versions of Python prior to 3.3 by using the collection module for these older versions. Python-3.3 and later continue to use the collections.abc module. The -py3 option no longer has any effect on the %pythonabc feature. 2022-03-21: jschueller, jim-easterbrook, wsfulton [Python] #2137 C++ static member functions no longer generate a "flattened" name in the Python module. For example: s = example.Spam() s.foo() # Spam::foo() via an instance example.Spam.foo() # Spam::foo() using class method example.Spam_foo() # Spam::foo() "flattened" name The "flattened" name is no longer generated, but can be generated by using the new -flatstaticmethod option. *** POTENTIAL INCOMPATIBILITY *** 2022-03-18: ianlancetaylor [Go] #337 Implement %extend base methods in child classes. 2022-03-17: olly [Python] #1779 SWIG's Python test-suite and examples are now run with Python 3 by default. To run them with Python 2, set PY2 to a non-empty value, e.g.: make check-python-test-suite PY2=1 2022-03-16: olly [Go] #683 -intgosize is now optional - if not specified the generated C/C++ wrapper code will use ptrdiff_t for intgo and size_t for uintgo. 2022-03-15: ianlancetaylor [Go] Add typemaps for std::string*. 2022-03-15: ianlancetaylor [Go] Don't convert arrays to pointers if there is a "gotype" typemap entry. 2022-03-15: ianlancetaylor [Go] Add documentation note about Go and C++ exceptions. 2022-03-12: wsfulton #1524 %interface family of macros no longer contain the getter/setter methods for wrapping variables. The interface only contains virtual and non-virtual instance methods, that is, no static methods. Enums are also no longer added to the interface (affects Java only where they were missing from the proxy class, C# never had them in the interface). *** POTENTIAL INCOMPATIBILITY *** 2022-03-12: wsfulton #1277 Fixes for the family of %interface macros, %interface, %interface_impl and %interface_custom fixes for overloaded methods in an inheritance chain. When C++ methods are not able to be overloaded in a derived class, such as when they differ by just const, or the target language parameters types are identical even when the C++ parameter types are different, SWIG will ignore one of the overloaded methods with a warning. A %ignore is required to explicitly ignore one of the overloaded methods to avoid the warning message. Methods added in the derived classes due to one of the %interface macros are now similarly ignored/not added to the derived class. The methods added to the derived classes can now also be modified via %feature and %rename. 2022-03-08: ianlancetaylor [Go] Treat a nil argument as a NULL pointer. 2022-03-08: ianlancetaylor [Go] Add documentation notes about thread local storage. 2022-03-08: olly #1006 SWIG now copes with an interface filename specified on the command line which contains a closing parenthesis `)`, and more generally with attributes to `%include` and `%import` which are quoted and contain parentheses. 2022-03-07: Omar Medina [Tcl] https://sourceforge.net/p/swig/bugs/1290/ Fix SWIG_AsWCharPtrAndSize() to actually assign to result variable. It looks like SWIG/Tcl wide character handling is currently fundamentally broken except on systems which use wide characters as the system encoding, but this should fix wrapping functions which take a wide string as a parameter on Microsoft Windows. 2022-03-07: olly [Javascript] #682 Fix handling of functions which take void*. 2022-03-06: olly SWIG should now reliably exit with status 0 if the run was successful and status 1 if there was an error (or a warning and -Werror was in effect). Previously in some situations SWIG would try to exit with the status set to the number of errors encountered, but that's problematic - for example if there were 256 errors this would result in exit status 0 on most platforms. Also some error statuses have special meanings e.g. those defined by . Also SWIG/Javascript tried to exit with status -1 in a few places (which typically results in exit status 255). 2022-03-05: wsfulton #1441 Fix using declaration in derived class incorrectly introducing a method from a base class when the using declaration is declared before the method declaration. Problem occurred when within a namespace and the parameter types in the method signatures were not fully qualified. 2022-03-05: ianlancetaylor [Go] Treat non-const references as pointers. 2022-03-05: ianlancetaylor In SWIG Go testsuite, fail test if "go build" fails. 2022-03-03: olly #1901 #2223 SWIG should now always exit cleanly if memory allocation fails, including removing any output files created during the current run. Previously most places in the code didn't check for a NULL return from malloc()/realloc()/calloc() at all, typically resulting in undefined behaviour; some places used assert() to check for a NULL return (which is a misuse of assert() and such checks disappear if built with NDEBUG defined leaving us back with undefined behaviour). 2022-03-03: olly #891 Report errors for typemap attributes without a value (previously SWIG segfaulted) and for typemap types with a value (previously the value was quietly ignored). The old way of specifying a language name in the typemap attributes is no longer supported (it has been deprecated for 16 years). 2022-03-02: geographika, wsfulton [Python] #1951 Add Python variable annotations support. Both function annotations and variable annotations are turned on using the "python:annotations" feature. Example: %feature("python:annotations", "c"); struct V { float val; }; The generated code contains a variable annotation containing the C float type: class V(object): val: "float" = property(_example.V_val_get, _example.V_val_set) ... Python 3.5 and earlier do not support variable annotations, so variable annotations can be turned off with a "python:annotations:novar" feature flag. Example turning on function annotations but not variable annotations globally: %feature("python:annotations", "c"); %feature("python:annotations:novar"); or via the command line: -features python:annotations=c,python:annotations:novar *** POTENTIAL INCOMPATIBILITY *** 2022-02-27: wsfulton [Python] #735 #1561 Function annotations containing C/C++ types are no longer generated when using the -py3 option. Function annotations support has been moved to a feature to provide finer grained control. It can be turned on globally by adding: %feature("python:annotations", "c"); or by using the command line argument: -features python:annotations=c Also see entry dated 2022-03-02, regarding variable annotations. *** POTENTIAL INCOMPATIBILITY *** 2022-02-26: wsfulton #655 #1840 Add new warning WARN_LANG_USING_NAME_DIFFERENT to warn when a method introduced by a using declaration in a derived class cannot be used due to a conflict in names. 2022-02-24: olly #1465 An invalid preprocessor expression is reported as a pair of warnings with the second giving a more detailed message from the expression evaluator. Previously SWIG prefixed the second message with "Error:" - that was confusing as it's actually only a warning by default so we've now dropped this prefix. Before: x.i:1: Warning 202: Could not evaluate expression '1.2' x.i:1: Warning 202: Error: 'Floating point constant in preprocessor expression' Now: x.i:1: Warning 202: Could not evaluate expression '1.2' x.i:1: Warning 202: Floating point constant in preprocessor expression 2022-02-23: olly #1384 Fix a preprocessor expression evaluation bug. A subexpression in parentheses lost its string/int type flag and instead used whatever type was left in the stack entry from previous use. In practice we mostly got away with this because most preprocessor expressions are integer, but it could have resulted in a preprocessor expression incorrectly evaluating as zero. If -Wextra was in use you got a warning: Warning 202: Error: 'Can't mix strings and integers in expression' 2022-02-21: davidcl [Scilab] Improve 5.5.2, 6.0.0 and 6.1.0 support. For Scilab 5, long names are reduced to small names preserving the class prefix and accessor suffix (get or set). For Scilab 6, long names with the class prefix and accessor suffix should be used on the user code. The `-targetversion` option has been removed as the generated code now detects the Scilab version in loader.sce or builder.sce. *** POTENTIAL INCOMPATIBILITY *** 2022-02-20: wsfulton Fix %warnfilter warning suppress for warning 315 SWIGWARN_PARSE_USING_UNDEF. 2022-02-17: olly [PHP] https://sourceforge.net/p/swig/bugs/1211/ Fix to call cleanup code in exception situations and not to invoke the freearg typemap twice in certain situations. 2022-02-15: olly #300 #368 Improve parser handling of % followed immediately by an identifier. If it's not a recognised directive the scanner now emits MODULO and then rescans what follows, and if the parser then gives a syntax error we report it as an unknown directive. This means that `a%b` is now allowed in an expression, and that things like `%std::vector` now give an error rather than being quietly ignored. 2022-02-11: adr26 [Python] #2154 Fix memory leak. SWIG python objects were being freed after the corresponding SWIG module information was destroyed in Python 3, causing leaks when as a result the object destructor could not be invoked. To prevent this misordering, SWIG python objects now obtain a reference to the Python capsule wrapping the module information, so that the module information is correctly destroyed after all SWIG python objects have been freed (and corresponding destructors invoked). 2022-02-10: olly [Tcl] https://sourceforge.net/p/swig/bugs/1207/ https://sourceforge.net/p/swig/bugs/1213/ Fix Tcl generic input typemap for std::vector. 2022-02-07: sethrj #2196 Add alternative syntax for specifying fragments in typemaps. New syntax: %typemap("in", fragment="frag1", fragment="frag2", fragment="frag3") {...} which is equivalent to: %typemap(in, fragment="frag1,frag2,frag3") {...} 2022-02-07: olly #1806 Remove support for the "command" encoder, which was mostly intended for use in `%rename` - most uses can be achieved using the "regex" encoder, so we recommend using that instead. The "command" encoder suffers from a number of issues - as the documentation for it admitted, "[it] is extremely slow compared to all the other [encoders] as it involves spawning a separate process and using it for many declarations is not recommended" and that it "should generally be avoided because of performance considerations". But it's also not portable. The design assumes that `/bin/sh` supports `<<<` but that's a bash-specific feature so it doesn't work on platforms where `/bin/sh` is not bash - it fails on Debian, Ubuntu and probably some other Linux distros, plus most non-Linux platforms. Microsoft Windows doesn't even have a /bin/sh as standard. Finally, no escaping of the passed string is done, so it has potential security issues (though at least with %rename the input is limited to valid C/C++ symbol names). 2022-02-06: olly #2193 -DFOO on the SWIG command line now sets FOO to 1 for consistency with C/C++ compiler preprocessors. Previously SWIG set FOO to an empty value. Existing invocations of SWIG with `-DFOO` where the empty value matters can be updated to `-DFOO=` which should work with both old and new releases of SWIG. *** POTENTIAL INCOMPATIBILITY *** 2022-02-06: sethrj #2194 Classes that are non-assignable due to const data or const reference members are now automatically detected. 2022-02-04: friedrichatgc [Octave] #1672 Fix for isobject for Octave 4.4 - 6.0. 2022-02-03: olly [C#] #283 #998 Fix memory leak in directorin typemap for std::string. 2022-02-03: olly [Python] #967 Make `self` parameter available to user typemaps. 2022-02-03: teythoon [Python] #801 Fix -Wunused-parameter warnings with builtin, 2022-02-03: teythoon #801 Fix -Wstrict-prototypes warnings in generated pointer functions. 2022-02-03: olly #660 https://sourceforge.net/p/swig/bugs/1081/ Default parameter values containing method calls are now parsed and handled - e.g. `x->foo(3,4)` and `y.z()`. 2022-02-02: olly [Ruby] https://sourceforge.net/p/swig/bugs/1136/ Fix remove of prefix from method name to only remove it at the start. 2022-02-01: olly #231 Handle returning an object by reference in a C++ trailing return type. 2022-02-01: davidcl [Scilab] #745 use SWIG__Init() as a C module init function. 2022-02-01: olly [OCaml] #2083 Fix to work when CAML_SAFE_STRING is on, which it is by default in recent Ocaml releases. 2022-01-31: mreeez https://sourceforge.net/p/swig/bugs/1147/ Fix copyToR() generated for a struct in a namespace. 2022-01-29: fschlimb #655 Better handling of using declarations. 2022-01-29: dontpanic92 [Go] #676 Fix code generated for a C++ class with a non-capitalised name. 2022-01-26: trex58 #1919 #1921 #1923 Various fixes for AIX portability. 2022-01-26: olly #1935 Don't crash on an unclosed HTML tag in a doxygen comment when -doxygen is specified. 2022-01-25: olly Constant expressions now support member access with `.` such as `foo.bar`. Previous this only worked in a case like `x->foo.bar`. 2022-01-25: olly #2091 Support most cases of `sizeof` applied to an expression in constant expressions. Previously there was only support for `sizeof()` and expressions which syntactically look like a type (such as `sizeof(foo)`). 2022-01-25: olly #80 #635 https://sourceforge.net/p/swig/bugs/1139/ Add support for parsing common cases of `<` and `>` comparisons in constant expressions. Adding full support for these seems hard to do without introducing conflicts into the parser grammar, but in fact all reported cases have had parentheses around the comparison and we can support that with a few restrictions on the left side of `<`. 2022-01-25: wsfulton New warning 327 for extern templates, eg: extern template class std::vector; extern template void Func(); results in warning example.i:3: Warning 327: Extern template ignored. example.i:4: Warning 327: Extern template ignored. Extern template classes previously resulted in warning 320. 2022-01-24: romintomasetti #2131 #2157 C++11 extern function template parsing error fix. 2022-01-21: wsfulton #2120 #2138 Replace legacy PCRE dependency with PCRE2. This requires changes for building SWIG from source. See updated html documentation in Preface.html and Windows.html. Updated instructions are also shown when running ./configure if PCRE2 is not found. Note that debian based systems can install PCRE2 using: apt install libpcre2-dev Note that https://github.com/swig/swig/wiki/Getting-Started also has updated information for building from source. 2022-01-19: olly [PHP] #2027 Automatically generate PHP type declarations for PHP 8. The generate code still compiles for PHP 7.x, but without type declarations since PHP 7.x has much more limited type declaration support. 2022-01-18: olly [Perl] #1629 Perl 5.8.0 is now the oldest version we aim to support. 2022-01-14: wsfulton [Python] Fix %callback and specifying the callback function as a static member function using Python staticmethod syntax, such as Klass.memberfunction instead of Klass_memberfunction when using -builtin and -fastproxy. 2022-01-11: wsfulton [Python] Accept keyword arguments accessing static member functions when using -builtin and kwargs feature and Python class staticmethod syntax. The missing keyword argument support was only when using the class staticmethod syntax, such as Klass.memberfunction, and not when using the flat static method syntax, such as Klass_memberfunction. 2022-01-04: juierror [Go] #2045 Add support for std::array in std_array.i. 2021-12-18: olly [PHP] Add PHP keyword 'readonly' (added in 8.1) to the list SWIG knows to automatically rename. This keyword is special in that PHP allows it to be used as a function (or method) name. 2021-12-07: vstinner [Python] #2116 Python 3.11 support: use Py_SET_TYPE() 2021-12-05: rwf1 [Octave] #2020 #1893 Add support for Octave 6 up to and including 6.4. Also add support for compiling with -Bsymbolic which is used by default by mkoctfile. 2021-12-02: jsenn [Python] #2102 Fixed crashes when using embedded Python interpreters. 2021-11-12: wsfulton [Javascript] v8 and node only. Fix mismatched new char[] and free() when wrapping C code char arrays. Now calloc is now used instead of new char[] in SWIG_AsCharPtrAndSize. 2021-10-03: ajrh1 [Perl] #2074: Avoid -Wmisleading-indentation in generated code when using gcc11. 2021-10-03: jschueller [CMake] #2065: Add option to enable or disable PCRE support. 2021-09-16: ianlancetaylor [Go] Improved _cgo_panic implementation. 2021-09-16: ianlancetaylor [Go] Don't use crosscall2 for panicking. Instead rely on documented and exported interfaces. 2021-09-14: ianlancetaylor [Go] Remove -no-cgo option (long unsupported in Go) 2021-05-04: olly [PHP] #2014 Throw PHP exceptions instead of using PHP errors PHP exceptions can be caught and handled if desired, but if they aren't caught then PHP exits in much the same way as it does for a PHP error. In particular this means parameter type errors and some other cases in SWIG-generated wrappers now throw a PHP exception, which matches how PHP's native parameter handling deals with similar situations. `SWIG_ErrorCode()`, `SWIG_ErrorMsg()`, `SWIG_FAIL()` and `goto thrown;` are no longer supported (these are really all internal implementation details and none are documented aside from brief mentions in CHANGES for the first three). I wasn't able to find any uses in user interface files at least in FOSS code via code search tools. If you are using these: Use `SWIG_PHP_Error(code,msg);` instead of `SWIG_ErrorCode(code); SWIG_ErrorMsg(msg);` (which will throw a PHP exception in SWIG >= 4.1 and do the same as the individual calls in older SWIG). `SWIG_FAIL();` and `goto thrown;` can typically be replaced with `SWIG_fail;`. This will probably also work with older SWIG, but please test with your wrappers if this is important to you. *** POTENTIAL INCOMPATIBILITY *** 2021-05-17: adr26 [Python] #1985 Fix memory leaks: 1. Python object references were being incorrectly retained by SwigPyClientData, causing swig_varlink_dealloc() never to run / free memory. SwigPyClientData_New() / SwigPyClientData_Del() were updated to fix the object reference counting, causing swig_varlink_dealloc() to run and the memory swig_varlink owns to be freed. 2. SwigPyClientData itself was not freed by SwigPyClientData_Del(), causing another heap leak. The required free() was added to SwigPyClientData_Del() 3. Fix reference counting/leak of python cached type query 4. Fix reference counting/leak of SwigPyObject dict (-builtin) 5. Python object reference counting fixes for out-of-memory scenarios were added to: SWIG_Python_RaiseOrModifyTypeError(), SWIG_Python_AppendOutput(), SwigPyClientData_New(), SwigPyObject_get___dict__() and SwigPyObject_format() 6. Add error handling for PyModule_AddObject() to SWIG_Python_SetModule() (failure could be caused by OOM or a name clash caused by malicious code) 2021-05-13: olly [UFFI] #2009 Remove code for Common Lisp UFFI. We dropped support for it in SWIG 4.0.0 and nobody has stepped forward to revive it in over 2 years. 2021-05-13: olly [S-EXP] #2009 Remove code for Common Lisp S-Exp. We dropped support for it in SWIG 4.0.0 and nobody has stepped forward to revive it in over 2 years. 2021-05-13: olly [Pike] #2009 Remove code for Pike. We dropped support for it in SWIG 4.0.0 and nobody has stepped forward to revive it in over 2 years. 2021-05-13: olly [Modula3] #2009 Remove code for Modula3. We dropped support for it in SWIG 4.0.0 and nobody has stepped forward to revive it in over 2 years. 2021-05-13: olly [CLISP] #2009 Remove code for GNU Common Lisp. We dropped support for it in SWIG 4.0.0 and nobody has stepped forward to revive it in over 2 years. 2021-05-13: olly [Chicken] #2009 Remove code for Chicken. We dropped support for it in SWIG 4.0.0 and nobody has stepped forward to revive it in over 2 years. 2021-05-13: olly [Allegrocl] #2009 Remove code for Allegro Common Lisp. We dropped support for it in SWIG 4.0.0 and nobody has stepped forward to revive it in over 2 years. 2021-05-04: olly [PHP] #1982 #1457 https://sourceforge.net/p/swig/bugs/1339/ SWIG now only use PHP's C API to implement its wrappers, and no longer generates PHP code to define classes. The wrappers should be almost entirely compatible with those generated before, but faster and without some previously hard-to-fix bugs. The main notable difference is SWIG no longer generates a .php wrapper at all by default (only if %pragma(php) code=... or %pragma(php) include=... are specified in the interface file). This also means you need to load the module via extension=... in php.ini, rather than letting the dl() in the generated .php wrapper load it (but dl() has only worked for command-line PHP for some years now). *** POTENTIAL INCOMPATIBILITY *** 2021-04-30: olly #1984 Remove support for $source and $target. These were officially deprecated in 2001, and attempts to use them have resulted in a warning (including a pointer to what to update them to) for most if not all of that time. 2021-04-27: wsfulton #1987 [Java] Fix %interface family of macros for returning by const pointer reference. 2021-04-19: olly Fix use of uninitialised variable in the generated code for an empty typecheck typemap, such as the dummy one we include for std::initializer_list. 2021-04-12: olly #1777 [Python] Specifying -py3 now generates a check for Python version >= 3.0. 2021-03-26: olly [PHP] Add PHP keywords 'fn' (added in 7.4) and 'match' (added in 8.0) to the list SWIG knows to automatically rename. 2021-03-23: wsfulton #1942 [Python] Fix compilation error in wrappers when using -builtin and wrapping varargs in constructors. 2021-03-22: goto40 #1977 Fix handling of template template parameters. 2021-03-21: olly #1929, #1978 [PHP] Add support for PHP 8. 2021-03-19: wsfulton #1610 Remove -ansi from default compilation flags. 2021-03-19: dot-asm #1934 [Java] Clean up typemaps for long long arrays. 2021-03-19: olly #1527 [PHP] Improve PHP object creation in directorin case. Reportedly the code we were using in this case gave segfaults in PHP 7.2 and later - we've been unable to reproduce these, but the new approach is also simpler and should be bit faster too. 2021-03-18: olly #1655 [PHP] Fix char* typecheck typemap to accept PHP Null like the corresponding in typemap does. 2021-03-18: olly #1900, #1905 [PHP] Fix wrapping of overloaded directed methods with non-void return. 2021-03-11: murillo128 #1498 [Javascript] Support type conversion. 2021-03-06: nshmyrev #872 [Javascript] Various typemap issues in arrays_javascript.i fixed. 2021-03-03: vaughamhong #577 [Javascript] Implemented SetModule/GetModule for JSC to allow type sharing across modules. 2021-03-01: xantares, Oliver Buchtala, geographika #1040 Add support for building SWIG with CMake. See documentation in Windows.html. 2021-03-01: vadz #1952 Fix incorrect warning "Unknown Doxygen command: ." 2021-02-28: p2k #969 [Javascript] v8/node - prevent crash calling a constructor without new keyword. 2021-02-28: alecmev #405 #1121 [Javascript] Fix OUTPUT typemaps on methods that don't return void. The output value is appended to the return value. 2021-02-26: murillo128, wsfulton #1269 [Javascript] Fix handling of large positive unsigned long and unsigned long long values. 2021-02-24: tomleavy, yegorich, tungntpham #1746 [Javascript] Add support for Node v12, v14 and v16. SWIG support for Node is now for v6 and later only. 2020-02-09: ZackerySpytz #1872 Fix typos in attribute2ref macros. 2020-10-10: wsfulton [Javascript] Fix so that ccomplex.i interface to file can be used. 2020-10-10: wsfulton #252 complex can now be used as a C identifier and doesn't give a syntax error. 2020-10-10: lpsinger #1770 Correct C complex support. _Complex is now parsed as a keyword rather than complex as per the C99 standard. The complex macro is available in the ccomplex.i library file along with other complex number handling provided by the complex.h header. 2020-10-07: ZackerySpytz [Python] #1812 Fix the error handling for the PyObject_GetBuffer() calls in pybuffer.i. 2020-10-07: treitmayr #1824 Add missing space in director method declaration returning const pointer. 2020-10-07: adelva1984 #1859 Remove all (two) exceptions from SWIG executable. 2020-09-25: wsfulton [C#, Java] #1874 Add ability to change the modifiers for the interface generated when using the %interface macros. For C# use the 'csinterfacemodifiers' typemap. For Java use the 'javainterfacemodifiers' typemap. For example: %typemap(csinterfacemodifiers) X "internal interface" 2020-09-24: geefr [C#] #1868 Fix wchar_t* csvarout typemap for member variable wrappers. 2020-08-28: wsfulton [Java] #1862 Fix crashes in swig_connect_director during director class construction when using the director class from multiple threads - a race condition initialising block scope static variables. The fix is guaranteed when using C++11, but most compilers also fix it when using C++03/C++98. 2020-08-16: wsfulton [Python] Add missing initializer for member ‘_heaptypeobject::ht_module’ when using -builtin to complete Python 3.9 support. 2020-08-16: wsfulton [Python] Remove PyEval_InitThreads() call for Python 3.7 and later as Python calls it automatically now. This removes a deprecation warning when using Python 3.9. 2020-08-15: wsfulton [Python] All Python examples and tests are written to be Python 2 and Python 3 compatible, removing the need for 2to3 to run the examples or test-suite. 2020-08-13: wsfulton [C#] Add support for void *VOID_INT_PTR for member variables. 2020-07-29: chrisburr #1843 [Python] Compilation error fix in SwigPyBuiltin_SetMetaType when using PyPy. 2020-06-14: ZackerySpytz #1642 #1809 Fix virtual comparison operators in director classes - remove incorrect space in the function name, for example, operator= = is now operator==.