Fix clang build failure

src/sound/snd_ac97_codec.c

@@ -25,6 +25,7 @@
 #include <86box/device.h>
 #include <86box/io.h>
 #include <86box/snd_ac97.h>
+#include <86box/plat_fallthrough.h>
 
 static const struct {
     const device_t *device;
@@ -417,7 +418,7 @@ rate:              /* Writable only if VRA/VRM is set. */
                 /* Get actual previous value. */
                 prev = dev->vendor_reg_pages[(i << 3) | ((reg & 0x0e) >> 1)];
             }
-#ifndef __APPLE__
+#ifdef FALLTHROUGH_ANNOTATION
             [[fallthrough]];
 #endif
 

src/sound/snd_ad1848.c

@@ -30,6 +30,7 @@
 #include <86box/timer.h>
 #include <86box/sound.h>
 #include <86box/snd_ad1848.h>
+#include <86box/plat_fallthrough.h>
 
 #define CS4231 0x80
 #define CS4236 0x03
@@ -241,7 +242,7 @@ ad1848_write(uint16_t addr, uint8_t val, void *priv)
                 case 10:
                     if (ad1848->type < AD1848_TYPE_CS4235)
                         break;
-#ifndef __APPLE__
+#ifdef FALLTHROUGH_ANNOTATION
                     [[fallthrough]];
 #endif
 

src/sound/snd_cmi8x38.c

@@ -34,6 +34,7 @@
 #include <86box/gameport.h>
 #include <86box/nmi.h>
 #include <86box/ui.h>
+#include <86box/plat_fallthrough.h>
 #include <86box/plat_unused.h>
 
 enum {
@@ -467,7 +468,7 @@ cmi8x38_sb_mixer_write(uint16_t addr, uint8_t val, void *priv)
             case 0xf8 ... 0xff:
                 if (dev->type == CMEDIA_CMI8338)
                     mixer->regs[mixer->index] = val;
-#ifndef __APPLE__
+#ifdef FALLTHROUGH_ANNOTATION
                 [[fallthrough]];
 #endif
 

src/sound/snd_cs423x.c

@@ -36,6 +36,7 @@
 #include <86box/snd_ad1848.h>
 #include <86box/snd_opl.h>
 #include <86box/snd_sb.h>
+#include <86box/plat_fallthrough.h>
 #include <86box/plat_unused.h>
 
 #define CRYSTAL_NOEEPROM 0x100
@@ -299,7 +300,7 @@ cs423x_write(uint16_t addr, uint8_t val, void *priv)
                     switch (val) {
                         case 0x55: /* Disable PnP Key */
                             dev->pnp_enable = 0;
-#ifndef __APPLE__
+#ifdef FALLTHROUGH_ANNOTATION
                             [[fallthrough]];
 #endif
 

src/sound/snd_gus.c

@@ -17,6 +17,7 @@
 #include <86box/sound.h>
 #include <86box/timer.h>
 #include <86box/snd_ad1848.h>
+#include <86box/plat_fallthrough.h>
 #include <86box/plat_unused.h>
 
 enum {
@@ -626,7 +627,7 @@ writegus(uint16_t addr, uint8_t val, void *priv)
                 else if (gus->irq != -1)
                     picint(1 << gus->irq);
             }
-#ifndef __APPLE__
+#ifdef FALLTHROUGH_ANNOTATION
             [[fallthrough]];
 #endif
         case 0x20d:

src/sound/snd_sb_dsp.c

@@ -25,6 +25,7 @@
 #include <86box/sound.h>
 #include <86box/timer.h>
 #include <86box/snd_sb.h>
+#include <86box/plat_fallthrough.h>
 #include <86box/plat_unused.h>
 
 #define ADPCM_4  1
@@ -600,7 +601,7 @@ sb_exec_command(sb_dsp_t *dsp)
         case 0x75: /* 4-bit ADPCM output with reference */
             dsp->sbref  = dsp->dma_readb(dsp->dma_priv);
             dsp->sbstep = 0;
-#ifndef __APPLE__
+#ifdef FALLTHROUGH_ANNOTATION
             [[fallthrough]];
 #endif
         case 0x74: /* 4-bit ADPCM output */