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Using and Porting GNU Fortran

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9.9.6 Ugly Integer Conversions

The constructs enabled via `-fugly-logint' are:

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.

See section 15.5.5 Equivalence Versus Equality, for more information.

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