Version of OpenTTD

master

Expected result

Compiles without warnings

Actual result

/home/lordaro/dev/openttd/src/music/fluidsynth.cpp:85:53: warning: ‘void fluid_synth_set_sample_rate(fluid_synth_t*, float)’ is deprecated [-Wdeprecated-declarations]
   85 |  fluid_synth_set_sample_rate(_midi.synth, samplerate);
      |                                                     ^
In file included from /usr/include/fluidsynth.h:97,
                 from /home/lordaro/dev/openttd/src/music/fluidsynth.cpp:16:
/usr/include/fluidsynth/synth.h:179:38: note: declared here
  179 | FLUID_DEPRECATED FLUIDSYNTH_API void fluid_synth_set_sample_rate(fluid_synth_t *synth, float sample_rate);
      |                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~

Steps to reproduce

Compile

From http://www.fluidsynth.org/api/synth_8h.html#ac89771633b393c807e5d5766f5a219b0 :

As of fluidsynth 2.1.0 this function has been deprecated. Changing the sample-rate is generally not considered to be a real-time use-case, as it always produces some audible artifact ("click", "pop") on the dry sound and effects (because LFOs for chorus and reverb need to be reinitialized). The sample-rate change may also require memory allocation deep down in the effect units. However, this memory allocation may fail and there is no way for the caller to know that, because the actual change of the sample-rate is executed during rendering. This function cannot (must not) do the sample-rate change itself, otherwise the synth needs to be locked down, causing rendering to block. Esp. do not use this function if this synth instance is used by an audio driver, because the audio driver cannot be notified by this sample-rate change. Long story short: don't use it.