Makefile.mingw corrections and made the code pass much stricter checks (now mandated by Makefile.mignw) to ensure GCC 14 readiness.

src/sound/midi.c

@@ -172,7 +172,7 @@ midi_out_device_get_from_internal_name(char *s)
 }
 
 void
-midi_out_device_init()
+midi_out_device_init(void)
 {
     if (devices[midi_output_device_current].device)
         device_add(devices[midi_output_device_current].device);
@@ -290,7 +290,7 @@ midi_in_device_get_from_internal_name(char *s)
 }
 
 void
-midi_in_device_init()
+midi_in_device_init(void)
 {
     if (midi_in_devices[midi_input_device_current].device)
         device_add(midi_in_devices[midi_input_device_current].device);

src/sound/midi_mt32.c

@@ -119,7 +119,7 @@ mt32_check(const char *func, mt32emu_return_code ret, mt32emu_return_code expect
 }
 
 int
-mt32_old_available()
+mt32_old_available(void)
 {
     if (roms_present[0] < 0)
         roms_present[0] = (rom_present(MT32_OLD_CTRL_ROM) && rom_present(MT32_OLD_PCM_ROM));
@@ -127,7 +127,7 @@ mt32_old_available()
 }
 
 int
-mt32_new_available()
+mt32_new_available(void)
 {
     if (roms_present[0] < 0)
         roms_present[0] = (rom_present(MT32_NEW_CTRL_ROM) && rom_present(MT32_NEW_PCM_ROM));
@@ -135,7 +135,7 @@ mt32_new_available()
 }
 
 int
-cm32l_available()
+cm32l_available(void)
 {
     if (roms_present[1] < 0)
         roms_present[1] = (rom_present(CM32L_CTRL_ROM) && rom_present(CM32L_PCM_ROM));
@@ -143,7 +143,7 @@ cm32l_available()
 }
 
 int
-cm32ln_available()
+cm32ln_available(void)
 {
     if (roms_present[1] < 0)
         roms_present[1] = (rom_present(CM32LN_CTRL_ROM) && rom_present(CM32LN_PCM_ROM));
@@ -199,7 +199,7 @@ mt32_stream_int16(int16_t *stream, int len)
 }
 
 void
-mt32_poll()
+mt32_poll(void)
 {
     midi_pos++;
     if (midi_pos == 48000 / RENDER_RATE) {

src/sound/snd_adlibgold.c

@@ -131,7 +131,7 @@ static int treble_cut[6] = {
     (int) (0.354 * 16384)  /*-3 dB - filter output is at +6 dB*/
 };
 
-void adgold_timer_poll();
+void adgold_timer_poll(void *p);
 void adgold_update(adgold_t *adgold);
 
 void

src/sound/snd_sb.c

@@ -2035,37 +2035,37 @@ sb_16_compat_init(const device_t *info)
 }
 
 static int
-sb_awe32_available()
+sb_awe32_available(void)
 {
     return rom_present("roms/sound/awe32.raw");
 }
 
 static int
-sb_32_pnp_available()
+sb_32_pnp_available(void)
 {
     return sb_awe32_available() && rom_present("roms/sound/CT3600 PnP.BIN");
 }
 
 static int
-sb_awe32_pnp_available()
+sb_awe32_pnp_available(void)
 {
     return sb_awe32_available() && rom_present("roms/sound/CT3980 PnP.BIN");
 }
 
 static int
-sb_awe64_value_available()
+sb_awe64_value_available(void)
 {
     return sb_awe32_available() && rom_present("roms/sound/CT4520 PnP.BIN");
 }
 
 static int
-sb_awe64_available()
+sb_awe64_available(void)
 {
     return sb_awe32_available() && rom_present("roms/sound/CT4520 PnP.BIN");
 }
 
 static int
-sb_awe64_gold_available()
+sb_awe64_gold_available(void)
 {
     return sb_awe32_available() && rom_present("roms/sound/CT4540 PnP.BIN");
 }

src/sound/xaudio2.c

@@ -107,7 +107,7 @@ static IXAudio2VoiceCallback callbacks = { &callbacksVtbl };
 #endif
 
 void
-inital()
+inital(void)
 {
 #if defined(_WIN32) && !defined(USE_FAUDIO)
     if (xaudio2_handle == NULL) {
@@ -182,7 +182,7 @@ inital()
 }
 
 void
-closeal()
+closeal(void)
 {
     if (!initialized)
         return;