Fails to build with Python 3.12

[sebastic]

Description

The Debian package failed to build with Python 3.12:

aarch64-linux-gnu-gcc -fno-strict-overflow -Wsign-compare -DNDEBUG -g -O2 -Wall -g -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -g -fwrapv -O2 -g -O2 -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I/usr/lib/python3/dist-packages/numpy/core/include -I/usr/include/python3.12 -c lib/cartopy/trace.cpp -o build/temp.linux-aarch64-cpython-312/lib/cartopy/trace.o
lib/cartopy/trace.cpp: In function ‘bool __pyx_f_7cartopy_5trace_degenerate_line(const __pyx_t_7cartopy_5trace_Line&)’:
lib/cartopy/trace.cpp:1623:34: error: ‘_PyCFrame’ {aka ‘struct _PyCFrame’} has no member named ‘use_tracing’
 1623 |      (unlikely((tstate)->cframe->use_tracing) &&\
      |                                  ^~~~~~~~~~~

Full buildlog

Operating system

Debian unstable

Cartopy version

0.22.0

[dopplershift]

use_tracing isn't anywhere in the Cartopy code base, so I'm guessing it's coming from Cython. Looks like that build is using Cython 0.29.36:

Selecting previously unselected package cython3.
Preparing to unpack .../040-cython3_0.29.36-3+b1_arm64.deb ...
Unpacking cython3 (0.29.36-3+b1) ...

I'd wonder if the build would work with Cython 3.

[QuLogic]

The build is fine on Fedora; I think you do need a newer Cython.

[QuLogic]

See cython/cython#5285 if you really want to use 0.29, but 3.0 works.

[sebastic]

Confirmed fixed with cython 3.0.6 from Debian experimental.