(g77-295.info)Variables Assumed To Be Zero


Variables Assumed To Be Zero
----------------------------

   Many Fortran programs were developed on systems that provided
automatic initialization of all, or some, variables and arrays to zero.
As a result, many of these programs depend, sometimes inadvertently, on
this behavior, though to do so violates the Fortran standards.

   You can ask `g77' for this behavior by specifying the
`-finit-local-zero' option when compiling Fortran code.  (You might
want to specify `-fno-automatic' as well, to avoid code-size inflation
for non-optimized compilations.)

   Note that a program that works better when compiled with the
`-finit-local-zero' option is almost certainly depending on a
particular system's, or compiler's, tendency to initialize some
variables to zero.  It might be worthwhile finding such cases and
fixing them, using techniques such as compiling with the `-O
-Wuninitialized' options using `g77'.


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