.line
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.
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.
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