For some target languages (Octave, Python and Ruby), SWIG has previously
treated nullptr or NULL as an integer 0 if used in a situation where
the type wasn't known to be a pointer.
For nullptr this is never helpful, because it has type nullptr_t which
does not implicitly convert to 0, so we no longer do this.
For NULL it's rather dubious - C and C++ allow NULL to be defined as
integer 0, so `int i = NULL` may work and is occassionally seen in real
code, but it is semantically wrong. Also GCC and clang define NULL to a
magic value and by default will warn about such misuse, so it's likely
to be less common than before they did this. So now SWIG only converts
NULL to 0 if used in a context where we know the underlying type is an
arithmetic type.
Using an integer zero (or equivalent value such as 0L) for a NULL
pointer is valid, and SWIG will still treat it as a NULL pointer if used
in a context where know the type is a pointer. This is now done based
on the value of the integer constant so also applies to 0L (previously
it was only done if the value was written in the code as literally `0`).
Fixes: #3472
- configure.ac
- Use minimum version 5.2 for Lua
- Add lua 5.5, it was released in dec 2025
- Syntax improvements
- GHA CI
- Remove 'default' Lua version, it is confusing.
Just select the version explicitly.
- Add Lua 5.4 test, we need to test all supported versions 5.2, 5.3 and 5.4
Lua 5.5 is not available on Ubuntu yet.
- Lua documentation Doc/Manual/Lua.html
- Update version to 5.2
- Remove mention to older SWIG version,
whom wishes to go to the very old history can look on CHANGES.
- Add references on missing operators in Lua.
- _ENV exist from Lua 5.2.
- Remove old compatibility code from Lib/lua/luarun.swg.
- Remove LUA_VERSION_NUM from Lua C wrapping code.
It was used for old Lua 5.0 and Lua 5.1.
- Remove _VERSION from Lua tests.
Note: _VERSION remains a keyword and developers may use it in interface files!
- Remove Example/lua/import.lua and Examples/test-suite/lua/import.lua
as they are not used or needed any longer.
- Remove old Lua import.
- Add Examples/test-suite/lua/helpers.lua
- include it in all tests in test-suite.
- Add catch "undefined" global variables enable function.
- Add import_to_globs function.
To add module functions, variables and classes to global scope.
- Remove the -squash-bases option as it is broken
The der.new_func from the example
in the document, "29.3.18.3 Inheritance",
pass from base object to derived object
regardless of using the flag or not.
- Remove -no-old-metatable-bindings as it is deprecated in the last 12 years
Signed-off-by: Erez Geva <ErezGeva2@gmail.com>
Olly Betts