Re: Supported SWIG version on swig-py3

I ran check-swig-{py|pl|rb} with some SWIG versions on swig-py3 branch.

Environment:
   OS: FreeBSD 11.2
   Python 2: 2.7.16
   Python 3: 3.7.3
   Perl: 5.28.2
   Ruby: 2.5.5p157

Results are below.

SWIG 1.3.24:
   I couldn't build swig itself.

SWIG 2.0.0:
   Python 2 ... OK (skipped=1)
   Python 3 ... can't build modules
   Perl ... can't build modules (Perhaps due to issue on build
                 with Perl >= 5.16, fixed in SWIG 2.0.8)[1]
   Ruby ... 100% passed

SWIG 2.0.12:
   Python 2 ... OK (skipped=1)
   Python 3 ... FAILED (failures=16, errors=22)
   Perl ... PASS
   Ruby ... 100% passed

SWIG 3.0.0:
   Python 2 ... OK (skipped=1)
   Python 3 ... FAILED (failures=16, errors=22)
   Perl ... PASS
   Ruby ... 100% passed

SWIG 3.0.9:
   Python 2 ... can't import modules
                 (regression, fixed in SWIG 3.0.10)[2]
   Python 3 ... can't import modules
                 (regression, fixed in SWIG 3.0.10)[2]
   Perl ... PASS
   Ruby ... 100% passed

SWIG 3.0.10:
   Python 2 ... OK (skipped=1)
   Python 3 ... OK
   Perl ... PASS
   Ruby ... 100% passed

SWIG 3.0.12:
   Python 2 ... OK (skipped=1)
   Python 3 ... OK
   Perl ... PASS
   Ruby ... 100% passed

SWIG 4.0.1:
   Python 2 ... can't build modules correctly (SVN-4818)
   Python 3 ... can't build modules correctly (SVN-4818)
   Perl ... PASS
   Ruby ... 100% passed

[1] https://github.com/swig/swig/blob/rel-2.0.8/CHANGES.current#L30
[2] https://github.com/swig/swig/blob/rel-3.0.10/RELEASENOTES#L11

I also make a patch to update subversion/binding/swig/INSTALL,
however I don't touch build/ac-macros/swig.m4.

Cheers,

-- 
Yasuhito FUTATSUKI <futatuki_at_poem.co.jp>