Fix warning for Android NDK compiler: "function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]"

https://stackoverflow.com/questions/42125/warning-error-function-declaration-isnt-a-prototype
In C int foo() and int foo(void) are different functions. int foo() accepts an arbitrary number of arguments, while int foo(void) accepts 0 arguments. In C++ they mean the same thing.

test/checkkeys.c

@@ -107,7 +107,7 @@ print_modifiers(char **text, size_t *maxlen)
 }
 
 static void
-PrintModifierState()
+PrintModifierState(void)
 {
     char message[512];
     char *spot;
@@ -166,7 +166,7 @@ PrintText(const char *eventtype, const char *text)
     SDL_Log("%s Text (%s): \"%s%s\"\n", eventtype, expanded, *text == '"' ? "\\" : "", text);
 }
 
-void loop()
+void loop(void)
 {
     SDL_Event event;
     /* Check for events */

test/checkkeysthreads.c

@@ -103,7 +103,7 @@ print_modifiers(char **text, size_t *maxlen)
 }
 
 static void
-PrintModifierState()
+PrintModifierState(void)
 {
     char message[512];
     char *spot;
@@ -162,7 +162,7 @@ PrintText(const char *eventtype, const char *text)
     SDL_Log("%s Text (%s): \"%s%s\"\n", eventtype, expanded, *text == '"' ? "\\" : "", text);
 }
 
-void loop()
+void loop(void)
 {
     SDL_Event event;
     /* Check for events */

test/loopwave.c

@@ -46,7 +46,7 @@ quit(int rc)
 }
 
 static void
-close_audio()
+close_audio(void)
 {
     if (device != 0) {
         SDL_CloseAudioDevice(device);
@@ -55,7 +55,7 @@ close_audio()
 }
 
 static void
-open_audio()
+open_audio(void)
 {
     /* Initialize fillerup() variables */
     device = SDL_OpenAudioDevice(NULL, SDL_FALSE, &wave.spec, NULL, 0);
@@ -70,7 +70,7 @@ open_audio()
 }
 
 #ifndef __EMSCRIPTEN__
-static void reopen_audio()
+static void reopen_audio(void)
 {
     close_audio();
     open_audio();
@@ -103,7 +103,7 @@ fillerup(void *unused, Uint8 *stream, int len)
 static int done = 0;
 
 #ifdef __EMSCRIPTEN__
-void loop()
+void loop(void)
 {
     if (done || (SDL_GetAudioDeviceStatus(device) != SDL_AUDIO_PLAYING)) {
         emscripten_cancel_main_loop();

test/loopwavequeue.c

@@ -48,7 +48,7 @@ void poked(int sig)
     done = 1;
 }
 
-void loop()
+void loop(void)
 {
 #ifdef __EMSCRIPTEN__
     if (done || (SDL_GetAudioStatus() != SDL_AUDIO_PLAYING)) {

test/testatomic.c

@@ -31,7 +31,7 @@ tf(SDL_bool _tf)
     return f;
 }
 
-static void RunBasicTest()
+static void RunBasicTest(void)
 {
     int value;
     SDL_SpinLock lock = 0;
@@ -153,7 +153,7 @@ static void runAdder(void)
     SDL_Log("Finished in %f sec\n", (end - start) / 1000.f);
 }
 
-static void RunEpicTest()
+static void RunEpicTest(void)
 {
     int b;
     atomicValue v;

test/testaudiocapture.c

@@ -24,7 +24,7 @@ static SDL_AudioDeviceID devid_in = 0;
 static SDL_AudioDeviceID devid_out = 0;
 
 static void
-loop()
+loop(void)
 {
     SDL_bool please_quit = SDL_FALSE;
     SDL_Event e;

test/testaudiohotplug.c

@@ -81,7 +81,7 @@ devtypestr(int iscapture)
 }
 
 static void
-iteration()
+iteration(void)
 {
     SDL_Event e;
     SDL_AudioDeviceID dev;
@@ -124,7 +124,7 @@ iteration()
 }
 
 #ifdef __EMSCRIPTEN__
-void loop()
+void loop(void)
 {
     if (done)
         emscripten_cancel_main_loop();

test/testautomation_audio.c

@@ -96,7 +96,7 @@ static SDL_bool DriverIsProblematic(const char *driver)
  * \sa https://wiki.libsdl.org/SDL_QuitSubSystem
  * \sa https://wiki.libsdl.org/SDL_InitSubSystem
  */
-int audio_quitInitAudioSubSystem()
+int audio_quitInitAudioSubSystem(void)
 {
     /* Stop SDL audio subsystem */
     SDL_QuitSubSystem(SDL_INIT_AUDIO);
@@ -114,7 +114,7 @@ int audio_quitInitAudioSubSystem()
  * \sa https://wiki.libsdl.org/SDL_InitAudio
  * \sa https://wiki.libsdl.org/SDL_QuitAudio
  */
-int audio_initQuitAudio()
+int audio_initQuitAudio(void)
 {
     int result;
     int i, iMax;
@@ -195,7 +195,7 @@ int audio_initQuitAudio()
  * \sa https://wiki.libsdl.org/SDL_CloseAudio
  * \sa https://wiki.libsdl.org/SDL_QuitAudio
  */
-int audio_initOpenCloseQuitAudio()
+int audio_initOpenCloseQuitAudio(void)
 {
     int result, expectedResult;
     int i, iMax, j, k;
@@ -318,7 +318,7 @@ int audio_initOpenCloseQuitAudio()
  *
  * \sa https://wiki.libsdl.org/SDL_PauseAudio
  */
-int audio_pauseUnpauseAudio()
+int audio_pauseUnpauseAudio(void)
 {
     int result;
     int i, iMax, j, k, l;
@@ -474,7 +474,7 @@ int audio_pauseUnpauseAudio()
  * \sa https://wiki.libsdl.org/SDL_GetNumAudioDevices
  * \sa https://wiki.libsdl.org/SDL_GetAudioDeviceName
  */
-int audio_enumerateAndNameAudioDevices()
+int audio_enumerateAndNameAudioDevices(void)
 {
     int t, tt;
     int i, n, nn;
@@ -532,7 +532,7 @@ int audio_enumerateAndNameAudioDevices()
  * \sa https://wiki.libsdl.org/SDL_GetNumAudioDevices
  * \sa https://wiki.libsdl.org/SDL_GetAudioDeviceName
  */
-int audio_enumerateAndNameAudioDevicesNegativeTests()
+int audio_enumerateAndNameAudioDevicesNegativeTests(void)
 {
     int t;
     int i, j, no, nc;
@@ -578,7 +578,7 @@ int audio_enumerateAndNameAudioDevicesNegativeTests()
  * \sa https://wiki.libsdl.org/SDL_GetNumAudioDrivers
  * \sa https://wiki.libsdl.org/SDL_GetAudioDriver
  */
-int audio_printAudioDrivers()
+int audio_printAudioDrivers(void)
 {
     int i, n;
     const char *name;
@@ -608,7 +608,7 @@ int audio_printAudioDrivers()
  *
  * \sa https://wiki.libsdl.org/SDL_GetCurrentAudioDriver
  */
-int audio_printCurrentAudioDriver()
+int audio_printCurrentAudioDriver(void)
 {
     /* Check current audio driver */
     const char *name = SDL_GetCurrentAudioDriver();
@@ -639,7 +639,7 @@ int _audioFrequencies[] = { 11025, 22050, 44100, 48000 };
  *
  * \sa https://wiki.libsdl.org/SDL_BuildAudioCVT
  */
-int audio_buildAudioCVT()
+int audio_buildAudioCVT(void)
 {
     int result;
     SDL_AudioCVT cvt;
@@ -703,7 +703,7 @@ int audio_buildAudioCVT()
  *
  * \sa https://wiki.libsdl.org/SDL_BuildAudioCVT
  */
-int audio_buildAudioCVTNegative()
+int audio_buildAudioCVTNegative(void)
 {
     const char *expectedError = "Parameter 'cvt' is invalid";
     const char *error;
@@ -798,7 +798,7 @@ int audio_buildAudioCVTNegative()
  *
  * \sa https://wiki.libsdl.org/SDL_GetAudioStatus
  */
-int audio_getAudioStatus()
+int audio_getAudioStatus(void)
 {
     SDL_AudioStatus result;
 
@@ -817,7 +817,7 @@ int audio_getAudioStatus()
  *
  * \sa https://wiki.libsdl.org/SDL_GetAudioStatus
  */
-int audio_openCloseAndGetAudioStatus()
+int audio_openCloseAndGetAudioStatus(void)
 {
     SDL_AudioStatus result;
     int i;
@@ -878,7 +878,7 @@ int audio_openCloseAndGetAudioStatus()
  * \sa https://wiki.libsdl.org/SDL_LockAudioDevice
  * \sa https://wiki.libsdl.org/SDL_UnlockAudioDevice
  */
-int audio_lockUnlockOpenAudioDevice()
+int audio_lockUnlockOpenAudioDevice(void)
 {
     int i;
     int count;
@@ -942,7 +942,7 @@ int audio_lockUnlockOpenAudioDevice()
  * \sa https://wiki.libsdl.org/SDL_BuildAudioCVT
  * \sa https://wiki.libsdl.org/SDL_ConvertAudio
  */
-int audio_convertAudio()
+int audio_convertAudio(void)
 {
     int result;
     SDL_AudioCVT cvt;
@@ -1043,7 +1043,7 @@ int audio_convertAudio()
  *
  * \sa https://wiki.libsdl.org/SDL_AudioDeviceConnected
  */
-int audio_openCloseAudioDeviceConnected()
+int audio_openCloseAudioDeviceConnected(void)
 {
     int result = -1;
     int i;
@@ -1118,7 +1118,7 @@ static double sine_wave_sample(const Sint64 idx, const Sint64 rate, const Sint64
  * \sa https://wiki.libsdl.org/SDL_BuildAudioCVT
  * \sa https://wiki.libsdl.org/SDL_ConvertAudio
  */
-int audio_resampleLoss()
+int audio_resampleLoss(void)
 {
   /* Note: always test long input time (>= 5s from experience) in some test
    * cases because an improper implementation may suffer from low resampling

test/testautomation_keyboard.c

@@ -102,7 +102,7 @@ int keyboard_getKeyFromName(void *arg)
 /*
  * Local helper to check for the invalid scancode error message
  */
-void _checkInvalidScancodeError()
+void _checkInvalidScancodeError(void)
 {
     const char *expectedError = "Parameter 'scancode' is invalid";
     const char *error;
@@ -574,7 +574,7 @@ int keyboard_getScancodeFromName(void *arg)
 /*
  * Local helper to check for the invalid scancode error message
  */
-void _checkInvalidNameError()
+void _checkInvalidNameError(void)
 {
     const char *expectedError = "Parameter 'name' is invalid";
     const char *error;

test/testautomation_log.c

@@ -21,7 +21,7 @@ static void EnableTestLog(int *message_count)
     SDL_LogSetOutputFunction(TestLogOutput, message_count);
 }
 
-static void DisableTestLog()
+static void DisableTestLog(void)
 {
     SDL_LogSetOutputFunction(original_function, original_userdata);
 }

test/testautomation_subsystems.c

@@ -40,7 +40,7 @@ static void subsystemsTearDown(void *arg)
  * \sa SDL_QuitSubSystem
  *
  */
-static int subsystems_referenceCount()
+static int subsystems_referenceCount(void)
 {
     const int system = SDL_INIT_VIDEO;
     int result;
@@ -90,7 +90,7 @@ static int subsystems_referenceCount()
  * \sa SDL_QuitSubSystem
  *
  */
-static int subsystems_dependRefCountInitAllQuitByOne()
+static int subsystems_dependRefCountInitAllQuitByOne(void)
 {
     int result;
     /* Ensure that we start with reset subsystems. */
@@ -128,7 +128,7 @@ static int subsystems_dependRefCountInitAllQuitByOne()
  * \sa SDL_QuitSubSystem
  *
  */
-static int subsystems_dependRefCountInitByOneQuitAll()
+static int subsystems_dependRefCountInitByOneQuitAll(void)
 {
     int result;
     /* Ensure that we start with reset subsystems. */
@@ -163,7 +163,7 @@ static int subsystems_dependRefCountInitByOneQuitAll()
  * \sa SDL_QuitSubSystem
  *
  */
-static int subsystems_dependRefCountWithExtraInit()
+static int subsystems_dependRefCountWithExtraInit(void)
 {
     int result;
     /* Ensure that we start with reset subsystems. */

test/testautomation_surface.c

@@ -81,7 +81,7 @@ void _surfaceTearDown(void *arg)
 /**
  * Helper that clears the test surface
  */
-void _clearTestSurface()
+void _clearTestSurface(void)
 {
     int ret;
     Uint32 color;

test/testautomation_video.c

@@ -624,7 +624,7 @@ int video_getWindowDisplayMode(void *arg)
 }
 
 /* Helper function that checks for an 'Invalid window' error */
-void _checkInvalidWindowError()
+void _checkInvalidWindowError(void)
 {
     const char *invalidWindowError = "Invalid window";
     char *lastError;
@@ -1300,7 +1300,7 @@ int video_getSetWindowPosition(void *arg)
 }
 
 /* Helper function that checks for an 'Invalid parameter' error */
-void _checkInvalidParameterError()
+void _checkInvalidParameterError(void)
 {
     const char *invalidParameterError = "Parameter";
     char *lastError;

test/testcustomcursor.c

@@ -148,7 +148,7 @@ quit(int rc)
     exit(rc);
 }
 
-void loop()
+void loop(void)
 {
     int i;
     SDL_Event event;

test/testdraw2.c

@@ -174,7 +174,7 @@ void DrawRects(SDL_Renderer *renderer)
     }
 }
 
-void loop()
+void loop(void)
 {
     Uint32 now;
     int i;

test/testdrawchessboard.c

@@ -28,7 +28,7 @@ SDL_Renderer *renderer;
 SDL_Surface *surface;
 int done;
 
-void DrawChessBoard()
+void DrawChessBoard(void)
 {
     int row = 0, column = 0, x = 0;
     SDL_Rect rect, darea;
@@ -53,7 +53,7 @@ void DrawChessBoard()
     SDL_RenderPresent(renderer);
 }
 
-void loop()
+void loop(void)
 {
     SDL_Event e;
     while (SDL_PollEvent(&e)) {

test/testgamecontroller.c

@@ -107,7 +107,7 @@ static int virtual_axis_start_x;
 static int virtual_axis_start_y;
 static SDL_GameControllerButton virtual_button_active = SDL_CONTROLLER_BUTTON_INVALID;
 
-static void UpdateWindowTitle()
+static void UpdateWindowTitle(void)
 {
     if (!window) {
         return;
@@ -329,7 +329,7 @@ typedef struct
     Uint8 ucLedBlue;                  /* 46 */
 } DS5EffectsState_t;
 
-static void CyclePS5TriggerEffect()
+static void CyclePS5TriggerEffect(void)
 {
     DS5EffectsState_t state;
 
@@ -351,7 +351,7 @@ static void CyclePS5TriggerEffect()
     SDL_GameControllerSendEffect(gamecontroller, &state, sizeof(state));
 }
 
-static SDL_bool ShowingFront()
+static SDL_bool ShowingFront(void)
 {
     SDL_bool showing_front = SDL_TRUE;
     int i;
@@ -394,7 +394,7 @@ static int SDLCALL VirtualControllerSetLED(void *userdata, Uint8 red, Uint8 gree
     return 0;
 }
 
-static void OpenVirtualController()
+static void OpenVirtualController(void)
 {
     SDL_VirtualJoystickDesc desc;
     int virtual_index;
@@ -420,7 +420,7 @@ static void OpenVirtualController()
     }
 }
 
-static void CloseVirtualController()
+static void CloseVirtualController(void)
 {
     int i;
 

test/testgeometry.c

@@ -62,7 +62,7 @@ int LoadSprite(const char *file)
     return 0;
 }
 
-void loop()
+void loop(void)
 {
     int i;
     SDL_Event event;

test/testgl2.c

@@ -78,7 +78,7 @@ quit(int rc)
 }
 
 static void
-Render()
+Render(void)
 {
     static float color[8][3] = {
         { 1.0, 1.0, 0.0 },

test/testgles.c

@@ -49,7 +49,7 @@ quit(int rc)
 }
 
 static void
-Render()
+Render(void)
 {
     static GLubyte color[8][4] = { { 255, 0, 0, 0 },
                                    { 255, 0, 0, 255 },

test/testgles2.c

@@ -569,7 +569,7 @@ render_thread_fn(void *render_ctx)
 }
 
 static void
-loop_threaded()
+loop_threaded(void)
 {
     SDL_Event event;
     int i;
@@ -598,7 +598,7 @@ loop_threaded()
 #endif
 
 static void
-loop()
+loop(void)
 {
     SDL_Event event;
     int i;

test/testgles2_sdf.c

@@ -325,7 +325,7 @@ int done;
 Uint32 frames;
 shader_data *datas;
 
-void loop()
+void loop(void)
 {
     SDL_Event event;
     int i;

test/testime.c

@@ -333,7 +333,7 @@ static Sint32 unifont_draw_glyph(Uint32 codepoint, int rendererID, SDL_Rect *dst
     return unifontGlyph[codepoint].width;
 }
 
-static void unifont_cleanup()
+static void unifont_cleanup(void)
 {
     int i, j;
     for (i = 0; i < state->num_windows; ++i) {
@@ -425,12 +425,12 @@ Uint32 utf8_decode(char *p, size_t len)
     return codepoint;
 }
 
-void usage()
+void usage(void)
 {
     SDL_Log("usage: testime [--font fontfile]\n");
 }
 
-void InitInput()
+void InitInput(void)
 {
     /* Prepare a rect for text input */
     textRect.x = textRect.y = 100;
@@ -444,7 +444,7 @@ void InitInput()
     SDL_StartTextInput();
 }
 
-void CleanupVideo()
+void CleanupVideo(void)
 {
     SDL_StopTextInput();
 #ifdef HAVE_SDL_TTF
@@ -597,7 +597,7 @@ void _Redraw(int rendererID)
     SDL_SetTextInputRect(&markedRect);
 }
 
-void Redraw()
+void Redraw(void)
 {
     int i;
     for (i = 0; i < state->num_windows; ++i) {

test/testintersections.c

@@ -208,7 +208,7 @@ DrawRectRectIntersections(SDL_Renderer *renderer)
     }
 }
 
-void loop()
+void loop(void)
 {
     int i;
     SDL_Event event;

test/testmultiaudio.c

@@ -53,7 +53,7 @@ play_through_once(void *arg, Uint8 *stream, int len)
     }
 }
 
-void loop()
+void loop(void)
 {
     if (SDL_AtomicGet(&cbd[0].done)) {
 #ifdef __EMSCRIPTEN__

test/testoffscreen.c

@@ -32,7 +32,7 @@ static int width = 640;
 static int height = 480;
 static unsigned int max_frames = 200;
 
-void draw()
+void draw(void)
 {
     SDL_Rect Rect;
 
@@ -50,7 +50,7 @@ void draw()
     SDL_RenderPresent(renderer);
 }
 
-void save_surface_to_bmp()
+void save_surface_to_bmp(void)
 {
     SDL_Surface *surface;
     Uint32 r_mask, g_mask, b_mask, a_mask;
@@ -71,7 +71,7 @@ void save_surface_to_bmp()
     SDL_FreeSurface(surface);
 }
 
-void loop()
+void loop(void)
 {
     SDL_Event event;
 

test/testoverlay2.c

@@ -178,7 +178,7 @@ PrintUsage(char *argv0)
     SDL_Log("\n");
 }
 
-void loop()
+void loop(void)
 {
     SDL_Event event;
 

test/testrelative.c

@@ -35,7 +35,7 @@ DrawRects(SDL_Renderer *renderer)
 }
 
 static void
-loop()
+loop(void)
 {
     /* Check for events */
     while (SDL_PollEvent(&event)) {

test/testrendercopyex.c

@@ -87,7 +87,7 @@ void Draw(DrawState *s)
     /* SDL_Delay(10); */
 }
 
-void loop()
+void loop(void)
 {
     int i;
     SDL_Event event;

test/testrendertarget.c

@@ -173,7 +173,7 @@ Draw(DrawState *s)
     return SDL_TRUE;
 }
 
-void loop()
+void loop(void)
 {
     int i;
     SDL_Event event;

test/testscale.c

@@ -78,7 +78,7 @@ void Draw(DrawState *s)
     SDL_RenderPresent(s->renderer);
 }
 
-void loop()
+void loop(void)
 {
     int i;
     SDL_Event event;

test/testshader.c

@@ -228,7 +228,7 @@ static void DestroyShaderProgram(ShaderData *data)
     }
 }
 
-static SDL_bool InitShaders()
+static SDL_bool InitShaders(void)
 {
     int i;
 
@@ -282,7 +282,7 @@ static SDL_bool InitShaders()
     return SDL_TRUE;
 }
 
-static void QuitShaders()
+static void QuitShaders(void)
 {
     int i;
 

test/testsprite2.c

@@ -392,7 +392,7 @@ void MoveSprites(SDL_Renderer *renderer, SDL_Texture *sprite)
     SDL_RenderPresent(renderer);
 }
 
-static void MoveAllSprites()
+static void MoveAllSprites(void)
 {
     int i;
 
@@ -404,7 +404,7 @@ static void MoveAllSprites()
     }
 }
 
-void loop()
+void loop(void)
 {
     Uint32 now;
     SDL_Event event;

test/testspriteminimal.c

@@ -43,7 +43,7 @@ quit(int rc)
     exit(rc);
 }
 
-void MoveSprites()
+void MoveSprites(void)
 {
     int i;
     int window_w = WINDOW_WIDTH;
@@ -77,7 +77,7 @@ void MoveSprites()
     SDL_RenderPresent(renderer);
 }
 
-void loop()
+void loop(void)
 {
     SDL_Event event;
 

test/teststreaming.c

@@ -94,7 +94,7 @@ void UpdateTexture(SDL_Texture *texture)
     SDL_UnlockTexture(texture);
 }
 
-void loop()
+void loop(void)
 {
     SDL_Event event;
 

test/testviewport.c

@@ -95,7 +95,7 @@ void DrawOnViewport(SDL_Renderer *renderer)
     SDL_RenderSetClipRect(renderer, NULL);
 }
 
-void loop()
+void loop(void)
 {
     SDL_Event event;
     int i;

test/testwm2.c

@@ -143,7 +143,7 @@ draw_modes_menu(SDL_Window *window, SDL_Renderer *renderer, SDL_Rect viewport)
     }
 }
 
-void loop()
+void loop(void)
 {
     int i;
     SDL_Event event;