OpenGL define its own datatype. Such as GLint or GLsizei. And they are different across platforms. Where can I find limits for the types?
Edit
Added language tag to clarify domain. And I know that GL* types will be resolved into basic C types, but it can be different by platform. (actually that's why they are defined.) And even basic C types are not guaranteed to be fixed size on any platform. That's why the limit.h is exist, and I expect there's also similar thing in GL itself for GL* types because they're semantically different with C types, and it means they need their own limit definitions.