Simplified Wrapper And Interface Generator

2025/12/08 - SWIG-4.4.1 released

• Fix errors with some combinations of Py_LIMITED_API and recent Python versions.
• A couple of other minor fixes/improvements.

2025/10/20 - SWIG-4.4.0 released

• Python-3.14 and early Python-3.15 support including modernisations:
  • Remove some DeprecationWarnings.
  • Added support for free-threading Python.
  • Multi-phase module initialization.
  • Use heap types instead of static types.
• Go minimum version is now 1.20.
• Removed support for MzScheme/Racket.
• Minor typemap improvements.
• compactdefaultarg feature improvements and fixes.
• Fewer C, C++ and Java compiler warnings in generated code.
• c++-14 auto return type parsing fixes.
• Various improvements related to parsing expressions.
• Runtime type system thread safety fixes.
• Minor fixes and improvements specific to: C#, D, Guile, Java, Javascript, Lua, Perl, PHP, Python, Tcl.

2025/04/15 - SWIG-4.3.1 released

• Small number of regression fixes for Python and Java.
• Corner case operator precedence bug fix affecting type deduction.
• Octave 10 compilation errors fix.

2024/10/20 - SWIG-4.3.0 released

SWIG-4.3.0 summary:

• Add experimental support for C as a target language.
• MzScheme/Racket is deprecated and planned for removal in SWIG-4.4.
• The distributed Windows binary is now a 64-bit executable.
• Add some missing use of move semantics for performance improvements.
• Enhanced handling of namespaces when using the nspace feature.
• STL wrapper enhancements for std::unique_ptr, std::string_view, std::filesystem.
• Various enum and enum class wrapping improvements.
• Other C++ handling improvements around templates, friends, C++11 trailing return types and C++17 fold expressions.
• Many parser improvements for both C and C++, especially expressions.
• Improvements to handling of string and character literals.
• Minor preprocessor fixes.
• Python: Stricter stable ABI conformance, add support for python-3.13.
• C#: Add support for converting Doxygen comments into XML C# comments.
• Various other target language specific enhancements and updates for Java, Javascript, Lua, MzScheme, Ocaml, Octave, Perl, Python, R, Ruby.

2024/02/24 - SWIG-4.2.1 released

SWIG-4.2.1 is primarily a stability and regression fix release, but also includes:

• Tcl 9.0 support.
• Octave 9.0 support.
• Improvements wrapping friend functions.
• Variadic templated functions within a template support.
• Type deduction enhancements.

2023/12/31 - SWIG-4.2.0 released

SWIG-4.2.0 summary:

• Various template wrapping improvements: template template parameters, variadic templates, partially specialized templates, const template parameters and improved error checking instantiating templates.
• Improved decltype() support for expressions.
• C++14 auto without trailing return type and C++11 auto variables.
• Numerous C++ using declarations improvements.
• Numerous fixes for constructors, destructors and assignment operators: implicit, default and deleted and related non-assignable variable wrappers.
• STL: std::array and std::map improvements, std::string_view support added.
• Various C preprocessor improvements.
• Various issues fixed to do with architecture specific long type.
• Various Doxygen improvements.
• D1/Tango support removed. D2/Phobos is now the supported D version and SWIG now generates code which works with recent D2 releases.
• New Javascript generator targeting Node.js binary stable ABI Node-API.
• Octave 8.1 support added.
• PHP7 support removed, PHP8 is now the supported PHP version.
• Python STL container wrappers now use the Python Iterator Protocol.
• Python stable ABI support added.
• Python 3.12 support added.
• Ruby 3.2 and 3.3 support.
• Scilab 2023.* support added.
• Various minor enhancements for C#, Go, Guile, Javascript, Lua, Ocaml, Perl, PHP, R, Racket, Ruby, Scilab and Tcl.
• A number of deprecated features have been removed.

2022/11/30 - SWIG-4.1.1 released

SWIG-4.1.1 summary:

• Couple of stability fixes.
• Stability fix in ccache-swig when calculating hashes of inputs.
• Some template handling improvements.
• R - minor fixes plus deprecation for rtypecheck typemaps being optional.

2022/10/24 - SWIG-4.1.0 released

SWIG-4.1.0 summary:

• Add Javascript Node v12-v18 support, remove support prior to v6.
• Octave 6.0 to 6.4 support added.
• Add PHP 8 support.
• PHP wrapping is now done entirely via PHP's C API - no more .php wrapper.
• Perl 5.8.0 is now the oldest version SWIG supports.
• Python 3.3 is now the oldest Python 3 version SWIG supports.
• Python 3.9-3.11 support added.
• Various memory leak fixes in Python generated code.
• Scilab 5.5-6.1 support improved.
• Many improvements for each and every target language.
• Various preprocessor expression handling improvements.
• Improved C99, C++11, C++14, C++17 support. Start adding C++20 standard.
• Make SWIG much more move semantics friendly.
• Add C++ std::unique_ptr support.
• Few minor C++ template handling improvements.
• Various C++ using declaration fixes.
• Few fixes for handling Doxygen comments.
• GitHub Actions is now used instead of Travis CI for continuous integration.
• Add building SWIG using CMake as a secondary build system.
• Update optional SWIG build dependency for regex support from PCRE to PCRE2.

2020/06/08 - SWIG-4.0.2 released

SWIG-4.0.2 summary:

• A few fixes around doxygen comment handling.
• Ruby 2.7 support added.
• Various minor improvements to C#, D, Java, OCaml, Octave, Python, R, Ruby.
• Considerable performance improvement running SWIG on large interface files.

2019/08/21 - SWIG-4.0.1 released

SWIG-4.0.1 summary:

• SWIG now cleans up on error by removing all generated files.
• Add Python 3.8 support.
• Python Sphinx compatibility added for Doxygen comments.
• Some minor regressions introduced in 4.0.0 were fixed.
• Fix some C++17 compatibility problems in Python and Ruby generated code.
• Minor improvements/fixes for C#, Java, Javascript, Lua, MzScheme, Ocaml, Octave and Python.