Dear Maintainer,

As discussed with upstream in GDAL issue #15023 [0], it FTBFS since swig was updated to 4.5.0:

 extensions/gdalconst_wrap.c:3239:10: fatal error: iostream: No such file or directory
  3239 | #include <iostream>
       |          ^~~~~~~~~~
 compilation terminated.

The issue seems to be that iostream is a C++ header but the file suggests C source.

The pycontainer patch seems to be the culprit:

"
 I can't reproduce the issue with SWIG 4.5.0 built from official SWIG tarballs, but looking at https://salsa.debian.org/debian/swig/-/blob/debian/master/debian/patches/include-pycontainer.patch , I believe it is the reason of the failure as it unconditionnally includes a SWIG .swg file only meant for C++. This patch to the SWIG package looks wrong to me
"

[0] https://github.com/OSGeo/gdal/issues/15023

Kind Regards,

Nas

Control: tags -1 patch

Dropping include-pycontainer.patch (e.g. as per the attached patch) is confirmed the fix the issue.

Has the issue been discussed with upstream or the patch forwarded? They likely can suggest a better fix.

I don't know if it's possible to make the include conditional for C++, that might be a good alternative too.

Kind Regards,

Bas

The attached patch does that and also resolves the GDAL build failure.

Either of these patches should be forwarded upstream to get their input on the best solution.

Kind Regards,

Bas

We believe that the bug you reported is fixed in the latest version of
swig, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1144324@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Rafael Laboissière <rafael@debian.org> (supplier of updated swig package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sat, 15 Aug 2026 07:47:03 +0000
Source: swig
Architecture: source
Version: 4.5.0-2
Distribution: unstable
Urgency: medium
Maintainer: Torsten Landschoff <torsten@debian.org>
Changed-By: Rafael Laboissière <rafael@debian.org>
Closes: 1144324
Changes:
 swig (4.5.0-2) unstable; urgency=medium
 .
   [ Bas Couwenberg ]
   * d/p/include-pycontainer.patch: Include pycontainer.swg only for C++
     (Closes: #1144324)
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* Sebastiaan Couwenberg <sebastic@debian.org> [2026-08-14 07:46]:

Thanks for you patch. I committed it at your name [1] and released version 4.5.0-2 of the package. I hope there will not be other collateral effects.

As you are already in contact with the upstream authors regarding this issue, could you please forward your patch to them?

Best,

Rafael Laboissière

[1] https://salsa.debian.org/debian/swig/-/commit/2995208e6103b136aaaf7920c72732409bfe7562

I hope so too, that's why it's good to forward the patch upstream to get their feedback, there might be better ways to fix the issue reported in #1024555.

To clarify, I was in contact with GDAL upstream, not SWIG upstream.

I'd prefer if you forward the patch to SWIG upstream as you're in a better position to coordinate with them, I'd rather not be the man in the middle.

If you are unable or unwilling to upstream the patch I can do that despite the drawbacks.

Kind Regards,

Bas

* Sebastiaan Couwenberg <sebastic@debian.org> [2026-08-15 12:58]:

I introduced the patch in order to avoid the xdmf package to FTBFS. Your patch works with xdmf, at least, which depends on SWIG's C++ wrappers.

Oh, my bad. You are right. I apologize for the confusion.

Best,

Rafael Laboissière