Tuesday, March 1, 2011

From Visual Studio to Xcode #2

Consider the following code:

int Test()


int a=10;

int c;

// Bug. User meant “=” but unfortunately wrote “==”


return c;


This piece of code is obviously faulty. c is never assigned the value of a. c is actually never assigned any value.

When we compile this in VS 2008 we get the following warnings:

  • warning C4553: '==' : operator has no effect; did you intend '=' ?
  • warning C4700: uninitialized local variable 'c' used

In Xcode, we get no warnings at all. I just spent 30 minutes tracing this kind of bug in my code, in Xcode. I know I have made the mistake of replacing “=” with “==” several times in the past, but usually VS warns me in these occations. Xcode does not.

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