Bug#1119760: plplot: FTBFS: /<<PKGBUILDDIR>>/obj-x86_64-linux-gnu/bindings/python/plplotcPYTHON_wrap.c:23948:3: error: returning 'void *' from a function with return type 'int' makes integer from pointer without a cast [-Wint-conversion]

[Rafael Laboissière]

Control: tags -1 confirmed upstream pending

Hi Santiago,

* Santiago Vila <sanvila at debian.org> [2025-10-31 11:29]:

> Package: src:plplot
> Version: 5.15.0+dfsg2-17
> Severity: serious
> Tags: ftbfs forky sid
>
> Dear maintainer:
>
> During a rebuild of all packages in unstable, this package failed to build.
>
> Below you will find the last part of the build log (probably the most 
> relevant part, but not necessarily). If required, the full build log 
> is available here:
>
> https://people.debian.org/~sanvila/build-logs/202510/
>
> […]
>
> --------------------------------------------------------------------------------
> [...]
> 
> cd /<<PKGBUILDDIR>>/obj-x86_64-linux-gnu/bindings/python &&  [too-long-redacted] ngs/python/plplotcPYTHON_wrap.c
> /<<PKGBUILDDIR>>/obj-x86_64-linux-gnu/bindings/python/plplotcPYTHON_wrap.c: In function ‘SWIG_mod_exec’:
> /<<PKGBUILDDIR>>/obj-x86_64-linux-gnu/bindings/python/plplotcPYTHON_wrap.c:23948:3: error: returning ‘void *’ from a function with return type ‘int’ makes integer from pointer without a cast [-Wint-conversion]
> 23948 |   import_array();
>      |   ^~~~~~~~~~~~

Thanks for the bug report.

The problem actually comes from the python3-numpy-dev package, which is 
incompatible with SWIG version 4.4, which is now in sid. It was 
compatible with the previous version, 4.3. I have reported the issue 
upstream.[1]

I am preparing a fix for the Plplot package via a patch.[2] It is just a 
workaround which will become obsolete once the Python3-numpy-dev package 
is fixed.

Since the present bug report will be closed with the upcoming release of 
the Plplot package (version 5.15.0+dfsg2-18), how should I proceed? 
Should I file a bug report against python3-numpy-dev and declare that it 
affects src:plplot?

Best,

Rafael

  [1] https://github.com/numpy/numpy/issues/30122
  [2] https://salsa.debian.org/science-team/plplot/-/commit/19cb1ef64baf2c17a831932ed5c321abb21138e7