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(g77-300.info)Short Lines

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Short Lines
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   Source lines shorter than the applicable fixed-form length are
treated as if they were padded with spaces to that length.  (None of
this is relevant to source files written in free form.)

   This affects only continued character and Hollerith constants, and
is a different interpretation than provided by some other popular
compilers (although a bit more consistent with the traditional
punched-card basis of Fortran and the way the Fortran standard
expressed fixed source form).

   `g77' might someday offer an option to warn about cases where
differences might be seen as a result of this treatment, and perhaps an
option to specify the alternate behavior as well.

   Note that this padding cannot apply to lines that are effectively of
infinite length--such lines are specified using command-line options
like `-ffixed-line-length-none', for example.