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(g77-295.info)Unwanted Variables

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Unwanted Variables
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   The `-Wunused' option can find bugs involving implicit typing,
sometimes more easily than using `-Wimplicit' in code that makes heavy
use of implicit typing.  An unused variable or array might indicate
that the spelling for its declaration is different from that of its
intended uses.

   Other than cases involving typos, unused variables rarely indicate
actual bugs in a program.  However, investigating such cases thoroughly
has, on occasion, led to the discovery of code that had not been
completely written--where the programmer wrote declarations as needed
for the whole algorithm, wrote some or even most of the code for that
algorithm, then got distracted and forgot that the job was not complete.