avoid cgoCheckPointer. ref golang/go#12416

sqlite3.go

@@ -74,6 +74,20 @@ void _sqlite3_result_blob(sqlite3_context* ctx, const void* b, int l) {
   sqlite3_result_blob(ctx, b, l, SQLITE_TRANSIENT);
 }
 
+
+int _sqlite3_create_function(
+  sqlite3 *db,
+  const char *zFunctionName,
+  int nArg,
+  int eTextRep,
+  uintptr_t pApp,
+  void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
+  void (*xStep)(sqlite3_context*,int,sqlite3_value**),
+  void (*xFinal)(sqlite3_context*)
+) {
+  return sqlite3_create_function(db, zFunctionName, nArg, eTextRep, (void*) pApp, xFunc, xStep, xFinal);
+}
+
 void callbackTrampoline(sqlite3_context*, int, sqlite3_value**);
 void stepTrampoline(sqlite3_context*, int, sqlite3_value**);
 void doneTrampoline(sqlite3_context*);
@@ -353,7 +367,7 @@ func (c *SQLiteConn) RegisterFunc(name string, impl interface{}, pure bool) erro
 	if pure {
 		opts |= C.SQLITE_DETERMINISTIC
 	}
-	rv := C.sqlite3_create_function(c.db, cname, C.int(numArgs), C.int(opts), unsafe.Pointer(&fi), (*[0]byte)(unsafe.Pointer(C.callbackTrampoline)), nil, nil)
+	rv := C._sqlite3_create_function(c.db, cname, C.int(numArgs), C.int(opts), C.uintptr_t(uintptr(unsafe.Pointer(&fi))), (*[0]byte)(unsafe.Pointer(C.callbackTrampoline)), nil, nil)
 	if rv != C.SQLITE_OK {
 		return c.lastError()
 	}
@@ -478,7 +492,7 @@ func (c *SQLiteConn) RegisterAggregator(name string, impl interface{}, pure bool
 	if pure {
 		opts |= C.SQLITE_DETERMINISTIC
 	}
-	rv := C.sqlite3_create_function(c.db, cname, C.int(stepNArgs), C.int(opts), unsafe.Pointer(&ai), nil, (*[0]byte)(unsafe.Pointer(C.stepTrampoline)), (*[0]byte)(unsafe.Pointer(C.doneTrampoline)))
+	rv := C._sqlite3_create_function(c.db, cname, C.int(stepNArgs), C.int(opts), C.uintptr_t(uintptr(unsafe.Pointer(&ai))), nil, (*[0]byte)(unsafe.Pointer(C.stepTrampoline)), (*[0]byte)(unsafe.Pointer(C.doneTrampoline)))
 	if rv != C.SQLITE_OK {
 		return c.lastError()
 	}