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When trying to compile SDL2 2.0.5 on Android-ndk, I get the following warnings on SDL_test_common.c 64-bit compilations:

--- Begin of error copy
jni/SDL2/src/test/SDL_test_common.c: In function 'SDLTest_PrintEvent':
jni/SDL2/src/test/SDL_test_common.c:1213:9: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'SDL_GestureID' [-Wformat=]
         SDL_Log("SDL_EVENT: Dollar gesture detect: %"SDL_PRIs64, (Sint64) event->dgesture.gestureId);
         ^
jni/SDL2/src/test/SDL_test_common.c:1216:9: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'SDL_GestureID' [-Wformat=]
         SDL_Log("SDL_EVENT: Dollar gesture record: %"SDL_PRIs64, (Sint64) event->dgesture.gestureId);
--- End of error copy
(The Begin and End of the copied text from the Windows 10 command prompt are marked on their own lines)

Also, some other warning occurs on 32-bit compilations:
--- Begin of error copy
jni/SDL2/src/render/opengles2/SDL_gles2funcs.h: In function 'GLES2_LoadFunctions':
jni/SDL2/src/render/opengles2/SDL_render_gles2.c:294:45: warning: assignment from incompatible pointer type
 #define SDL_PROC(ret,func,params) data->func=func;
                                             ^
jni/SDL2/src/render/opengles2/SDL_gles2funcs.h:56:1: note: in expansion of macro 'SDL_PROC'
 SDL_PROC(void, glShaderSource, (GLuint, GLsizei, const GLchar* const*, const GLint *))
--- End of error copy

The SDL2/src directory is a directly unmodified copy of the SDL2-2.0.5\src folder in the zip file provided on the libsdl.org website.