[Bug 1866208] Re: FTBFS against SWIG 4

[Lucas Kanashiro]

I forwarded the changes added by Dimitri to Debian and the maintainer
accepted it while subversion does not support SWIG 4 upstream:

https://tracker.debian.org/news/1111658/accepted-subversion-1130-3
-source-into-unstable/

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Title:
  FTBFS against SWIG 4

Status in subversion package in Ubuntu:
  New
Status in subversion package in Debian:
  Unknown

Bug description:
  While trying to rebuild src:subversion against Ruby 2.7 I figured out
  it actually FTBFS due to the swig update to version 4. This is a known
  upstream bug [1], and the fix was not released yet. This is part of
  the build log (focal-proposed needs to be enabled to reproduce it):

  ...
  Wrote subversion/bindings/swig/proxy/swig_python_external_runtime.swg
  /usr/bin/swig -I/<<PKGBUILDDIR>>/BUILD/subversion -I/<<PKGBUILDDIR>>/subversion/include -I/<<PKGBUILDDIR>>/subversion/bindings/swig -I/<<PKGBUILDDIR>>/subversion/bindings/swig/include -I/<<PKGBUILDDIR>>/subversion/bindings/swig/proxy -I/<<PKGBUILDDIR>>/BUILD/subversion/bindings/swig/proxy -I/usr/include/apr-1.0  -I/usr/include/apr-1.0 -I/usr/include  -python  -classic -o subversion/bindings/swig/python/core.c /<<PKGBUILDDIR>>/subversion/bindings/swig/core.i
  Deprecated command line option: -classic. This option is no longer supported.
  make[1]: *** [/<<PKGBUILDDIR>>/build-outputs.mk:290: subversion/bindings/swig/python/core.c] Error 1
  make[1]: Leaving directory '/<<PKGBUILDDIR>>/BUILD'
  make: *** [debian/rules:228: debian/stamp-build-arch] Error 2
  dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2


  After a discussion with doko on #ubuntu-devel we brought up with 2
  options:

  1) Drop the needed bindings. We'd need to take care with the reverse dependencies if we take this route.
  2) Maintain a swig 3 source package to support those bindings.

  I'd go for the first option, IMO it'd make the future maintenance
  easier.

  [1] https://issues.apache.org/jira/browse/SVN-4818

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