Originally Posted By etabeta78
yeah, for some reasons Apple GCC was happy to see the variable set even if not used, so it did not complain here.

GCC 4.6 added that diagnostic, it's why I was in a hurry to see mainline stop using 4.4 while Linux/BSD were shipping 4.6.x.

You can get better diagnostics on OS X by building with Clang (it'll probably become the default in another Xcode rev or two).