Fixed warning C4210: nonstandard extension used: function given file scope

Resurrected SDL_audio_c.h, we knew it would be back...

VisualC-GDK/SDL/SDL.vcxproj

@@ -367,6 +367,7 @@
     <ClInclude Include="..\..\src\audio\directsound\SDL_directsound.h" />
     <ClInclude Include="..\..\src\audio\disk\SDL_diskaudio.h" />
     <ClInclude Include="..\..\src\audio\dummy\SDL_dummyaudio.h" />
+    <ClInclude Include="..\..\src\audio\SDL_audio_c.h" />
     <ClInclude Include="..\..\src\audio\SDL_audiodev_c.h" />
     <ClInclude Include="..\..\src\audio\SDL_sysaudio.h" />
     <ClInclude Include="..\..\src\audio\SDL_audioqueue.h" />

VisualC-GDK/SDL/SDL.vcxproj.filters

@@ -411,6 +411,9 @@
     <ClInclude Include="..\..\include\SDL3\SDL_test_memory.h">
       <Filter>API Headers</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\src\audio\SDL_audio_c.h">
+      <Filter>audio</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\src\audio\SDL_audiodev_c.h">
       <Filter>audio</Filter>
     </ClInclude>

VisualC-WinRT/SDL-UWP.vcxproj

@@ -93,6 +93,7 @@
     <ClInclude Include="..\src\audio\disk\SDL_diskaudio.h" />
     <ClInclude Include="..\src\audio\dummy\SDL_dummyaudio.h" />
     <ClInclude Include="..\src\audio\SDL_audiodev_c.h" />
+    <ClInclude Include="..\src\audio\SDL_audio_c.h" />
     <ClInclude Include="..\src\audio\SDL_sysaudio.h" />
     <ClInclude Include="..\src\audio\SDL_audioqueue.h" />
     <ClInclude Include="..\src\audio\SDL_audioresample.h" />

VisualC-WinRT/SDL-UWP.vcxproj.filters

@@ -177,6 +177,9 @@
     <ClInclude Include="..\src\audio\SDL_audiodev_c.h">
       <Filter>Source Files</Filter>
     </ClInclude>
+    <ClInclude Include="..\src\audio\SDL_audio_c.h">
+      <Filter>Source Files</Filter>
+    </ClInclude>
     <ClInclude Include="..\src\audio\SDL_sysaudio.h">
       <Filter>Source Files</Filter>
     </ClInclude>

VisualC/SDL/SDL.vcxproj

@@ -317,6 +317,7 @@
     <ClInclude Include="..\..\src\audio\directsound\SDL_directsound.h" />
     <ClInclude Include="..\..\src\audio\disk\SDL_diskaudio.h" />
     <ClInclude Include="..\..\src\audio\dummy\SDL_dummyaudio.h" />
+    <ClInclude Include="..\..\src\audio\SDL_audio_c.h" />
     <ClInclude Include="..\..\src\audio\SDL_audiodev_c.h" />
     <ClInclude Include="..\..\src\audio\SDL_sysaudio.h" />
     <ClInclude Include="..\..\src\audio\SDL_audioqueue.h" />

VisualC/SDL/SDL.vcxproj.filters

@@ -402,6 +402,9 @@
     <ClInclude Include="..\..\include\SDL3\SDL_test_memory.h">
       <Filter>API Headers</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\src\audio\SDL_audio_c.h">
+      <Filter>audio</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\src\audio\SDL_audiodev_c.h">
       <Filter>audio</Filter>
     </ClInclude>

Xcode/SDL/SDL.xcodeproj/project.pbxproj

@@ -238,6 +238,7 @@
 		A7D8B76A23E2514300DCD162 /* SDL_wave.c in Sources */ = {isa = PBXBuildFile; fileRef = A7D8A86623E2513F00DCD162 /* SDL_wave.c */; };
 		A7D8B79423E2514400DCD162 /* SDL_dummyaudio.h in Headers */ = {isa = PBXBuildFile; fileRef = A7D8A87123E2513F00DCD162 /* SDL_dummyaudio.h */; };
 		A7D8B79A23E2514400DCD162 /* SDL_dummyaudio.c in Sources */ = {isa = PBXBuildFile; fileRef = A7D8A87223E2513F00DCD162 /* SDL_dummyaudio.c */; };
+		A7D8B7A023E2514400DCD162 /* SDL_audio_c.h in Headers */ = {isa = PBXBuildFile; fileRef = A7D8A87323E2513F00DCD162 /* SDL_audio_c.h */; };
 		A7D8B7B223E2514400DCD162 /* SDL_audiodev_c.h in Headers */ = {isa = PBXBuildFile; fileRef = A7D8A87723E2513F00DCD162 /* SDL_audiodev_c.h */; };
 		A7D8B81823E2514400DCD162 /* SDL_audiodev.c in Sources */ = {isa = PBXBuildFile; fileRef = A7D8A88F23E2513F00DCD162 /* SDL_audiodev.c */; };
 		A7D8B85A23E2514400DCD162 /* SDL_sysaudio.h in Headers */ = {isa = PBXBuildFile; fileRef = A7D8A89F23E2513F00DCD162 /* SDL_sysaudio.h */; };
@@ -746,6 +747,7 @@
 		A7D8A86623E2513F00DCD162 /* SDL_wave.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = SDL_wave.c; sourceTree = "<group>"; };
 		A7D8A87123E2513F00DCD162 /* SDL_dummyaudio.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = SDL_dummyaudio.h; sourceTree = "<group>"; };
 		A7D8A87223E2513F00DCD162 /* SDL_dummyaudio.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = SDL_dummyaudio.c; sourceTree = "<group>"; };
+		A7D8A87323E2513F00DCD162 /* SDL_audio_c.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = SDL_audio_c.h; sourceTree = "<group>"; };
 		A7D8A87723E2513F00DCD162 /* SDL_audiodev_c.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = SDL_audiodev_c.h; sourceTree = "<group>"; };
 		A7D8A88F23E2513F00DCD162 /* SDL_audiodev.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = SDL_audiodev.c; sourceTree = "<group>"; };
 		A7D8A89F23E2513F00DCD162 /* SDL_sysaudio.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = SDL_sysaudio.h; sourceTree = "<group>"; };
@@ -1813,6 +1815,7 @@
 				A7D8A8B923E2513F00DCD162 /* coreaudio */,
 				A7D8A8AF23E2513F00DCD162 /* disk */,
 				A7D8A87023E2513F00DCD162 /* dummy */,
+				A7D8A87323E2513F00DCD162 /* SDL_audio_c.h */,
 				F32DDAC92AB795A30041EAA5 /* SDL_audio_channel_converters.h */,
 				F32DDACC2AB795A30041EAA5 /* SDL_audio_resampler_filter.h */,
 				A7D8A8B823E2513F00DCD162 /* SDL_audio.c */,
@@ -2068,6 +2071,7 @@
 				A7D8B61723E2514300DCD162 /* SDL_assert_c.h in Headers */,
 				F3F7D9292933074E00816151 /* SDL_atomic.h in Headers */,
 				F3F7D8ED2933074E00816151 /* SDL_audio.h in Headers */,
+				A7D8B7A023E2514400DCD162 /* SDL_audio_c.h in Headers */,
 				A7D8B7B223E2514400DCD162 /* SDL_audiodev_c.h in Headers */,
 				F3F7D9E12933074E00816151 /* SDL_begin_code.h in Headers */,
 				F3F7D9A52933074E00816151 /* SDL_bits.h in Headers */,

src/audio/SDL_audio_c.h

@@ -0,0 +1,27 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef SDL_audio_c_h_
+#define SDL_audio_c_h_
+
+extern void SDL_UpdateAudio(void);
+
+#endif /* SDL_audio_c_h_ */

src/events/SDL_events.c

@@ -24,6 +24,7 @@
 
 #include "SDL_events_c.h"
 #include "../SDL_hints_c.h"
+#include "../audio/SDL_audio_c.h"
 #include "../timer/SDL_timer_c.h"
 #ifndef SDL_JOYSTICK_DISABLED
 #include "../joystick/SDL_joystick_c.h"
@@ -862,7 +863,6 @@ static void SDL_PumpEventsInternal(SDL_bool push_sentinel)
     }
 
 #ifndef SDL_AUDIO_DISABLED
-    extern void SDL_UpdateAudio(void);  // this is internal-only, so it doesn't have a hint and is not a public API.
     SDL_UpdateAudio();
 #endif