MIDI backend disabled despite the CMake log claiming otherwise

[VerMishelb]

Win11 24H2, MSYS2 UCRT. When configuring SDL_mixer, either with -D SDLMIXER_MIDI=ON or with no extra options specified, the CMake output lists midi_timidity as an enabled backend, yet attempting to play a midi with testmixer errors out with an unknown format message, listing available decoders as wav, stbvorbis, drflac, voc, aiff, au, drmp3, sinewave, raw.

I'm building from the master branch git cloned 18.07 without --recurse-submodules, if this matters, and judging by the root cmakelists it should indeed use timidity for this.

I also have an issue with one random wav file (pcm u8, 8363 Hz, mono, having an amazing length of 153 ms) refusing to play, but I'll leave this for a different time and a different issue, as I have sparse internet access at the moment. MPC-HC mediainfo shows two conformance errors for it.

[madebr]

You need to configure with -DSDLMIXER_VENDORED=ON to use the vendored modules.
If you want to use system package, install fluidsynth and/or timidity for midi support.
midi_fluidsynth and/or midi_timidity should then appear in the enabled backends.
Right now, only the single-file embedded decoers are enabled on your system.

[VerMishelb]

I tried to set SDLMIXER_VENDORED and unset these

SDLMIXER_VORBIS_TREMOR
SDLMIXER_VORBIS_VORBISFILE
SDLMIXER_FLAC_LIBFLAC
SDLMIXER_OPUS
SDLMIXER_GME
SDLMIXER_MOD_XMP
SDLMIXER_MP3_MPG123
SDLMIXER_WAVPACK

and the result seems to be identical. Does built-in timidity silently depend on something from this list?
I suppose I'm actually missing timidity itself and the stuff from src/timidity won't do anything without it, but in that case wouldn't it be in external/ as well, with the rest of vendored libs?

[madebr]

SDL_mixer/CMakeLists.txt

Lines 154 to 157 in 4cc1fb5

	cmake_dependent_option(SDLMIXER_MIDI_FLUIDSYNTH "Support FluidSynth MIDI output" ON "SDLMIXER_MIDI;NOT SDLMIXER_VENDORED" OFF)
	cmake_dependent_option(SDLMIXER_MIDI_FLUIDSYNTH_SHARED "Dynamically load libfluidsynth" "${SDLMIXER_DEPS_SHARED}" SDLMIXER_MIDI_FLUIDSYNTH OFF)
	cmake_dependent_option(SDLMIXER_MIDI_TIMIDITY "Support timidity MIDI output" ON SDLMIXER_MIDI OFF)

Have you configured with -DSDLMIXER_MIDI_TIMIDITY=ON?
FluidSynth is currently not available as vendored library.

[VerMishelb]

Judging by cmake docs it should've been set to ON automatically if it's vendored and midi support is enabled unless I'm blind and considered ; as "and", but I've just recompiled it with this parameter explicitly and it still refuses to read any midi files I have.
Tried to also set SDLMIXER_MIDI_FLUIDSYNTH=OFF to be sure, same result.

I've check the build artifacts, it compiles timidity files, but the playback fails. At one point I thought that the dll is from an outdated build, but this also wasn't the case.

At this point the only thing that comes to my mind is a missing timidity dll, but it's also not presented in bin/ after target installation.