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(g77-295.info)Ugly Integer Conversions

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Ugly Integer Conversions
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   The constructs enabled via `-fugly-logint' are:

   * Automatic conversion between `INTEGER' and `LOGICAL' as dictated by
     context (typically implies nonportable dependencies on how a
     particular implementation encodes `.TRUE.' and `.FALSE.').

   * Use of a `LOGICAL' variable in `ASSIGN' and assigned-`GOTO'
     statements.

   The above constructs are disabled by default because use of them
tends to lead to non-portable code.  Even existing Fortran code that
uses that often turns out to be non-portable, if not outright buggy.

   Some of this is due to differences among implementations as far as
how `.TRUE.' and `.FALSE.' are encoded as `INTEGER' values--Fortran
code that assumes a particular coding is likely to use one of the above
constructs, and is also likely to not work correctly on implementations
using different encodings.

   Note: Equivalence Versus Equality, for more information.