Fixed #3150 (Invalid warning when pointer difference is not adjacent)

lib/check64bit.cpp

@@ -62,7 +62,14 @@ void Check64BitPortability::pointerassignment()
                 assignmentIntegerToAddressError(tok->next());
 
             else if (isint(var1) && isaddr(var2) && !tok->tokAt(3)->isPointerCompare())
+            {
+                // assigning address => warning
+                // some trivial addition => warning
+                if (Token::Match(tok->tokAt(4), "+ %any% !!;"))
+                    continue;
+
                 assignmentAddressToIntegerError(tok->next());
+            }
         }
     }
 }

test/test64bit.cpp

@@ -140,6 +140,12 @@ private:
               "    int *a = x * x;\n"
               "}\n");
         TODO_ASSERT_EQUALS("error", "", errout.str());
+
+        check("void foo(int *start, int *end) {\n"
+              "    int len;\n"
+              "    int len = end + 10 - start;\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
     }
 };