a day ago I installed an SDL2 library. It is not in Debian Wheezy yet, so I used configure, make, make install commands.
After all, when I try to use SDL_Texture, I get this error:
error: forward declaration of ‘SDL_Texture {aka struct SDL_Texture}’
invalid use of incomplete type ‘SDL_Texture {aka struct SDL_Texture}’
After looking for declaration, everything I found are these two lines in SDL_render.h:
struct SDL_Texture;
typedef struct SDL_Texture SDL_Texture;
No definition at all. I think my installation is missing file SDL_sysrender.h. It is in source code I downloaded, but not in SDL2 include path.
Where should be the problem? Its necessary to use any flag for configure file? Thank you for help.
There's nothing wrong with your install. SDL_Texture is an opaque type by design (that is, designed to only be operated on by SDL2 internally), you can "pass it around" as a pointer, but you can't access the internals (or create a SDL_Texture yourself, for example by doing a malloc, because you don't know the size of the structure). If you stick to
SDL_Texture *blah;
pointers and pass them around to the SDL2 functions you should be fine.
SDL_sysrender.h is an internal header which, as you mentioned, actually defines SDL_Texture for internal consumption of the library.
来源：https://stackoverflow.com/questions/18897076/sdl-texture-incomplete-type