swig --version doesn't work in all versions of swig; -version should be used instead

[ngie-eign]

Did code inspection and it looks like setup.py relies on swig --version returning something meaningful (see the linked code below).

--version isn't implemented on all versions of swig (it seems that it's only technically implemented on the MacOS version of the package).

FreeBSD

% swig --version
Unable to find option or file '--version', Use 'swig -help' for more information.
% swig -version 

SWIG Version 4.2.1

Compiled with c++ [amd64-portbld-freebsd14.3]

Configured options: +pcre

Please see https://www.swig.org for reporting bugs and further information

Linux

% lsb_release -a
No LSB modules are available.
Distributor ID: Raspbian
Description:    Raspbian GNU/Linux 12 (bookworm)
Release:        12
Codename:       bookworm
% swig --version
Unable to find option or file '--version', Use 'swig -help' for more information.
% swig -version 

SWIG Version 4.1.0

Compiled with g++ [arm-unknown-linux-gnueabihf]

Configured options: +pcre

Please see https://www.swig.org for reporting bugs and further information

macOS

% swig --version

SWIG Version 4.3.1

Compiled with clang++ [aarch64-apple-darwin24.2.0]

Configured options: +pcre

Please see https://www.swig.org for reporting bugs and further information

PyMuPDF/setup.py

Line 729 in 5b6acfb

swig_version_text = run(f'{swig} --version', capture=1)

[Arthur-Barreto]

We’re running into the same deprecation warnings on Python 3.12:

DeprecationWarning: builtin type SwigPyPacked has no module attribute
DeprecationWarning: builtin type SwigPyObject has no module attribute
DeprecationWarning: builtin type swigvarlink has no module attribute

They show up as soon as we import fitz, both in our unit tests and in a container image we ship. Right now we’re silencing them via filterwarnings, but just wanted to +1 that the problem affects us too. Happy to retest when a fix lands.

[julian-smith-artifex-com]

We keep issues open until they are fixed in a release, so reopening.

[ngie-eign]

We keep issues open until they are fixed in a release, so reopening.

Sounds good - thanks!