g77.info: Debug Line

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Debug Line

   Use of `D' or `d' as the first character (column 1) of a source line
denotes a debug line.
   In turn, a debug line is treated as either a comment line or a
normal line, depending on whether debug lines are enabled.
   When treated as a comment line, a line beginning with `D' or `d' is
treated as if it the first character was `C' or `c', respectively.
When treated as a normal line, such a line is treated as if the first
character was <SPC> (space).
   (Currently, `g77' provides no means for treating debug lines as
normal lines.)