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(g77-300.info)Nonportable Conversions

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Nonportable Conversions
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   `g77' doesn't accept some particularly nonportable, silent data-type
conversions such as `LOGICAL' to `REAL' (as in `A=.FALSE.', where `A'
is type `REAL'), that other compilers might quietly accept.

   Some of these conversions are accepted by `g77' when the
`-fugly-logint' option is specified.  Perhaps it should accept more or
all of them.