This pragma is different from warn_uninitializedvar. that uses a slightly different process to detect the uninitialized variables. It gives a warning whenever local variables are used before being initialized along any path to the usage. As a result, you get more warnings. However, some of the warnings are false ones. The warnings will be false when all paths with uninitialized status turn out to be paths that can never actually be taken.
#pragma warn_possiblyuninitializedvar on | off | reset
This pragma has no corresponding setting in the CodeWarrior IDE. By default, this pragma is off.