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The -Wsurprising option can help find bugs involving
expression evaluation or in
the way DO loops with non-integral iteration variables
are handled.
Cases found by this option might indicate a difference of
interpretation between the author of the code involved, and
a standard-conforming compiler such as g77.
Such a difference might produce actual bugs.
In any case, changing the code to explicitly do what the programmer might have expected it to do, so g77 and other compilers are more likely to follow the programmer's expectations, might be worthwhile, especially if such changes make the program work better.