Dear Maintainer,

The babeltrace2 package FTBFS with swig 4.5.0, which is currently in unstable. An excerpt of the build log is shown below.

This is due to the removal of the Python 2 compatibility macros in version 4.5.0. According to the SWIG authors, these macros were retained in the generated code (pyhead.swg) solely for user typemaps. Any typemap using these macros must be updated to call the Python 3 C API directly.

Best,

Rafael Laboissière

##### Build log excerpt

x86_64-linux-gnu-g++ -std=c++11 -fPIC -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/sysprof-6 -pthread -fvisibility=hidden -fvisibility-inlines-hidden -pthread -I/usr/includ
e/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/sysprof-6 -pthread -Wall -Wextra -Wmissing-declarations -Wnull-dereference -Wundef -Wredundant-decls -Wshadow -Wsuggest-attribute=format -Ww
rite-strings -Wformat=2 -Wstrict-aliasing -Wmissing-noreturn -Winit-self -Wduplicated-cond -Wduplicated-branches -Wlogical-op -Wsuggest-override -Wno-sign-compare -Wno-cast-function-type -Wno-maybe-uninitialized
 -g -O2 -ffile-prefix-map=<<BUILD-DIR>>/babeltrace2-2.1.2=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wno-shadow -Wno-null-derefer
ence -Wno-deprecated-declarations -Wno-redundant-decls -Wno-missing-field-initializers -Wno-unused-parameter -I../../../../include -I../../../../src -I../../../../src -include common/config.h -Wdate-time -D_FORT
IFY_SOURCE=2 -I./bt2 -I/usr/include/python3.14 -c bt2/native_bt.cpp -o build/temp.linux-x86_64-cpython-314/bt2/native_bt.o
In file included from bt2/native_bt.cpp:4039:
bt2/native_bt_error.i.hpp: In function ‘PyObject* bt_bt2_format_bt_error_cause(const bt_error_cause*)’:
bt2/native_bt_error.i.hpp:22:26: error: ‘PyString_FromString’ was not declared in this scope; did you mean ‘PyLong_FromString’?
   22 |     py_error_cause_str = PyString_FromString(error_cause_str);
      |                          ^~~~~~~~~~~~~~~~~~~
      |                          PyLong_FromString
bt2/native_bt_error.i.hpp: In function ‘PyObject* bt_bt2_format_bt_error(const bt_error*)’:
bt2/native_bt_error.i.hpp:38:20: error: ‘PyString_FromString’ was not declared in this scope; did you mean ‘PyLong_FromString’?
   38 |     py_error_str = PyString_FromString(error_str);
      |                    ^~~~~~~~~~~~~~~~~~~
      |                    PyLong_FromString
bt2/native_bt.cpp: In function ‘PyObject* _wrap_plugin_get_version(PyObject*, PyObject*)’:
bt2/native_bt.cpp:20695:55: error: ‘SWIG_Python_str_FromChar’ was not declared in this scope
20695 |       resultobj = SWIG_Python_AppendOutput(resultobj, SWIG_Python_str_FromChar(*arg5), 0);
      |                                                       ^~~~~~~~~~~~~~~~~~~~~~~~
bt2/native_bt.cpp: In function ‘PyObject* _wrap_bt2_plugin_get_version(PyObject*, PyObject*)’:
bt2/native_bt.cpp:21175:55: error: ‘SWIG_Python_str_FromChar’ was not declared in this scope
21175 |       resultobj = SWIG_Python_AppendOutput(resultobj, SWIG_Python_str_FromChar(*arg5), 0);
      |                                                       ^~~~~~~~~~~~~~~~~~~~~~~~
bt2/native_bt.cpp: In function ‘PyObject* _wrap_trace_borrow_environment_entry_by_index_const(PyObject*, PyObject*)’:
bt2/native_bt.cpp:24548:55: error: ‘SWIG_Python_str_FromChar’ was not declared in this scope
24548 |       resultobj = SWIG_Python_AppendOutput(resultobj, SWIG_Python_str_FromChar(*arg3), 1);
      |                                                       ^~~~~~~~~~~~~~~~~~~~~~~~
error: command '/usr/bin/x86_64-linux-gnu-g++' failed with exit code 1
make[5]: *** [Makefile:741: build-python-bindings.stamp] Error 1

I proposed a patch for fixing the issue as a merge request at Salsa:
https://salsa.debian.org/debian/babeltrace2/-/merge_requests/2

Best,

Rafael Laboissière

We believe that the bug you reported is fixed in the latest version of
babeltrace2, 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 1145035@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Michael Jeanson <mjeanson@debian.org> (supplier of updated babeltrace2 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: Fri, 21 Aug 2026 14:26:20 -0400
Source: babeltrace2
Architecture: source
Version: 2.1.2-2
Distribution: unstable
Urgency: medium
Maintainer: Michael Jeanson <mjeanson@debian.org>
Changed-By: Michael Jeanson <mjeanson@debian.org>
Closes: 1145035
Changes:
 babeltrace2 (2.1.2-2) unstable; urgency=medium
 .
   * Bump standards version to 4.7.4
   * Fix FTBFS with Swig 4.5.0 (Closes: #1145035)
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