Bug#1091425: llvm-toolchain-17 FTBFS with Python 3.13 as default

[Stefano Rivera]

Source: llvm-toolchain-17
Version: 1:17.0.6-18
Severity: normal
Tags: ftbfs
Justification: FTBFS
User: debian-python at lists.debian.org
Usertags: python3.13-default

This package failed build from source when test-built against a version of
python3-defaults that has 3.13 as the default Python 3 version.

To reproduce this issue, build against python3-defaults (python3-all-dev etc.)
from Debian experimental.

What's new in Python 3.13:
https://docs.python.org/3.13/whatsnew/3.13.html

Log snippet:

FAILED: tools/lldb/source/Plugins/ScriptInterpreter/Python/CMakeFiles/lldbPluginScriptInterpreterPython.dir/ScriptInterpreterPython.cpp.o 
/<<PKGBUILDDIR>>/build-llvm/bin/clang++ -DHAVE_ROUND -DLLDB_PYTHON_EXE_RELATIVE_PATH=\"bin/python3\" -DLLDB_PYTHON_RELATIVE_LIBDIR=\"lib/python3.13/site-packages\" -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/<<PKGBUILDDIR>>/build-llvm/tools/clang/stage2-bins/tools/lldb/source/Plugins/ScriptInterpreter/Python -I/<<PKGBUILDDIR>>/lldb/source/Plugins/ScriptInterpreter/Python -I/<<PKGBUILDDIR>>/lldb/include -I/<<PKGBUILDDIR>>/build-llvm/tools/clang/stage2-bins/tools/lldb/include -I/<<PKGBUILDDIR>>/build-llvm/tools/clang/stage2-bins/include -I/<<PKGBUILDDIR>>/llvm/include -I/usr/include/python3.13 -I/<<PKGBUILDDIR>>/clang/include -I/<<PKGBUILDDIR>>/build-llvm/tools/clang/stage2-bins/tools/lldb/../clang/include -I/<<PKGBUILDDIR>>/lldb/source -I/<<PKGBUILDDIR>>/build-llvm/tools/clang/stage2-bins/tools/lldb/source -isystem /usr/include/libxml2 -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -Wno-unused-command-line-argument -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -ffile-prefix-map=/<<PKGBUILDDIR>>/build-llvm/tools/clang/stage2-bins=build-llvm/tools/clang/stage2-bins -ffile-prefix-map=/<<PKGBUILDDIR>>/= -no-canonical-prefixes -Wno-deprecated-declarations -Wno-unknown-pragmas -Wno-strict-aliasing -Wno-deprecated-register -Wno-vla-extension -O2 -DNDEBUG -g1 -std=c++17  -fno-exceptions -funwind-tables -MD -MT tools/lldb/source/Plugins/ScriptInterpreter/Python/CMakeFiles/lldbPluginScriptInterpreterPython.dir/ScriptInterpreterPython.cpp.o -MF tools/lldb/source/Plugins/ScriptInterpreter/Python/CMakeFiles/lldbPluginScriptInterpreterPython.dir/ScriptInterpreterPython.cpp.o.d -o tools/lldb/source/Plugins/ScriptInterpreter/Python/CMakeFiles/lldbPluginScriptInterpreterPython.dir/ScriptInterpreterPython.cpp.o -c /<<PKGBUILDDIR>>/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp
/<<PKGBUILDDIR>>/lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp:180:9: error: use of undeclared identifier 'PyEval_ThreadsInitialized'
  180 |     if (PyEval_ThreadsInitialized()) {
      |         ^
1 error generated.
ninja: build stopped: subcommand failed.

FAILED: tools/clang/stage2-stamps/stage2-build /<<PKGBUILDDIR>>/build-llvm/tools/clang/stage2-stamps/stage2-build 
cd /<<PKGBUILDDIR>>/build-llvm/tools/clang/stage2-bins && /usr/bin/cmake --build /<<PKGBUILDDIR>>/build-llvm/tools/clang/stage2-bins/ --config Release && /usr/bin/cmake -E touch /<<PKGBUILDDIR>>/build-llvm/tools/clang/stage2-stamps/stage2-build
ninja: build stopped: subcommand failed.

cat: build-llvm/tools/clang/stage2-bins/CMakeFiles/CMakeOutput.log: No such file or directory
make[1]: *** [debian/rules:844: stamps/debian-full-build] Error 1
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:563: binary-arch] Error 2
dpkg-buildpackage: error: debian/rules binary-arch subprocess returned exit status 2
--------------------------------------------------------------------------------
Build finished at 2024-12-25T23:44:31Z


If required, the full build log is available here (for the next 30 days):
https://debusine.debian.net/artifact/1125840/

This bug has been filed at "normal" severity, as we haven't started the
transition to add 3.13 as default, yet. This will be raised to RC
as soon as that happens, hopefully well before trixie.

Thanks,

Stefano