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(g77-295.info)Warn About Implicit Conversions

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Warn About Implicit Conversions
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   `g77' needs a `-Wpromotions' option to warn if source code appears
to expect automatic, silent, and somewhat dangerous compiler-assisted
conversion of `REAL(KIND=1)' constants to `REAL(KIND=2)' based on
context.

   For example, it would warn about cases like this:

     DOUBLE PRECISION FOO
     PARAMETER (TZPHI = 9.435784839284958)
     FOO = TZPHI * 3D0