How can I get rid of an "unused variable" warning in Xcode?

Solution 1:

I'm unsure if it's still supported in the new LLVM compiler, but GCC has an "unused" attribute you can use to suppress that warning:

BOOL saved __attribute__((unused)) = [moc save:&error];

Alternatively (in case LLVM doesn't support the above), you could split the variable declaration into a separate line, guaranteeing that the variable would be "used" whether the macro expands or not:

BOOL saved = NO;
saved = [moc save:&error];

Solution 2:

Using Xcode 4.3.2 and found out that this seems to work (less writing)

BOOL saved __unused;

Solution 3:

In Xcode you can set the warnings for "Unused Variables." Go to "Build Settings" for the target and filter with the word "unused"

Here is a screenshot:

I suggest you only change it for Debug. That way you don't miss anything in your release version.