g77 needs an option to initialize everything (not otherwise
explicitly initialized) to "weird"
(machine-dependent) values, e.g. NaNs, bad (non-
NULL) pointers, and
largest-magnitude integers, would help track down references to
some kinds of uninitialized variables at run time.
Note that use of the options
-O -Wuninitialized can catch
many such bugs at compile time.