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(nasm.info)Section 4.10.1

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4.10.1. `%line' Directive
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   The `%line' directive is used to notify NASM that the input line
corresponds to a specific line number in another file. Typically this
other file would be an original source file, with the current NASM
input being the output of a pre-processor. The `%line' directive allows
NASM to output messages which indicate the line number of the original
source file, instead of the file that is being read by NASM.

   This preprocessor directive is not generally of use to programmers,
by may be of interest to preprocessor authors. The usage of the `%line'
preprocessor directive is as follows:

     %line nnn[+mmm] [filename]

   In this directive, `nnn' indentifies the line of the original source
file which this line corresponds to. `mmm' is an optional parameter
which specifies a line increment value; each line of the input file
read in is considered to correspond to `mmm' lines of the original
source file. Finally, `filename' is an optional parameter which
specifies the file name of the original source file.

   After reading a `%line' preprocessor directive, NASM will report all
file name and line numbers relative to the values specified therein.