How to turn off warnings about opaque declarations

is it possible to disable warnings associated with opaque declarations like the following example:

code from .h file
/** Opaque declaration for server side presence subscription */
typedef struct pjsua_srv_pres pjsua_srv_pres;

here's the result from buindings_generated.dart:
final class pjsua_srv_pres extends ffi.Opaque {}

how to get rid of annoying logs for every opaque declaration:
[WARNING]: No definition found for declaration - (Cursor) spelling: pjsua_srv_pres, kind: 2, kindSpelling: StructDecl, type: 105, typeSpelling: struct pjsua_srv_pres, usr: c:@S@pjsua_srv_pres