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(g77-300.info)Compiler Constants

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Compiler Constants
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   `g77' strictly assigns types to _all_ constants not documented as
"typeless" (typeless constants including `'1'Z', for example).  Many
other Fortran compilers attempt to assign types to typed constants
based on their context.  This results in hard-to-find bugs, nonportable
code, and is not in the spirit (though it strictly follows the letter)
of the 77 and 90 standards.

   `g77' might offer, in a future release, explicit constructs by which
a wider variety of typeless constants may be specified, and/or
user-requested warnings indicating places where `g77' might differ from
how other compilers assign types to constants.

   Note: Context-Sensitive Constants, for more information on this
issue.