as.info: Line

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`.line LINE-NUMBER'

   Change the logical line number.  LINE-NUMBER must be an absolute
expression.  The next line has that logical line number.  Therefore any
other statements on the current line (after a statement separator
character) are reported as on logical line number LINE-NUMBER - 1.  One
day `as' will no longer support this directive: it is recognized only
for compatibility with existing assembler programs.
   _Warning:_ In the AMD29K configuration of as, this command is not
available; use the synonym `.ln' in that context.
   Even though this is a directive associated with the `a.out' or
`b.out' object-code formats, `as' still recognizes it when producing
COFF output, and treats `.line' as though it were the COFF `.ln' _if_
it is found outside a `.def'/`.endef' pair.
   Inside a `.def', `.line' is, instead, one of the directives used by
compilers to generate auxiliary symbol information for debugging.