fix: Cython compile error with Cython 3

Declare MIDI change callback as 'noexcept' as it needs the GIL

Signed-off-by: Christopher Arndt <[email protected]>

README.md

@@ -17,7 +17,7 @@ information.
 To build and install jack_mixer run:
 
 ```console
-meson builddir --prefix=/usr --buildtype=release
+meson setup builddir --prefix=/usr --buildtype=release
 meson compile -C builddir
 [sudo] meson install -C builddir
 ```

src/_jack_mixer.pxd

@@ -25,7 +25,7 @@ cdef extern from "jack_mixer.h":
  ctypedef void * jack_mixer_output_channel_t
  ctypedef void * jack_mixer_threshold_t
 
- ctypedef void (*midi_change_callback)(void *)
+ ctypedef void (*midi_change_callback)(void *) noexcept with gil
 
  cdef enum midi_behavior_mode:
  pass

src/_jack_mixer.pyx

@@ -10,7 +10,7 @@ import enum
 from _jack_mixer cimport *
 
 
-cdef void midi_change_callback_func(void *userdata) with gil:
+cdef void midi_change_callback_func(void *userdata) noexcept with gil:
  """Wrapper for a Python callback function for MIDI input."""
  channel = <object> userdata
  channel._midi_change_callback()

src/meson.build

@@ -35,7 +35,7 @@ if get_option('gui').enabled()
  jack_mixer_mod_pyx = '_jack_mixer.pyx'
  jack_mixer_mod_c = '_jack_mixer.c'
 
- cython = find_program('cython3', 'cython', required: false)
+ cython = find_program('cython3', 'cython', 'cython0', required: false)
 
  if fs.exists(jack_mixer_mod_c)
  jack_mixer_cython = files(jack_mixer_mod_c)