as.info: Input Files
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Input Files
We use the phrase "source program", abbreviated "source", to
describe the program input to one run of `as'. The program may be in
one or more files; how the source is partitioned into files doesn't
change the meaning of the source.
The source program is a concatenation of the text in all the files,
in the order specified.
Each time you run `as' it assembles exactly one source program. The
source program is made up of one or more files. (The standard input is
also a file.)
You give `as' a command line that has zero or more input file names.
The input files are read (from left file name to right). A command
line argument (in any position) that has no special meaning is taken to
be an input file name.
If you give `as' no file names it attempts to read one input file
from the `as' standard input, which is normally your terminal. You may
have to type <ctl-D> to tell `as' there is no more program to assemble.
Use `--' if you need to explicitly name the standard input file in
your command line.
If the source is empty, `as' produces a small, empty object file.
Filenames and Line-numbers
There are two ways of locating a line in the input file (or files)
and either may be used in reporting error messages. One way refers to
a line number in a physical file; the other refers to a line number in a
"logical" file. *Note Error and Warning Messages: Errors.
"Physical files" are those files named in the command line given to
`as'.
"Logical files" are simply names declared explicitly by assembler
directives; they bear no relation to physical files. Logical file
names help error messages reflect the original source file, when `as'
source is itself synthesized from other files. `as' understands the
`#' directives emitted by the `gcc' preprocessor. See also *Note
`.file': File.
Created Wed Sep 1 16:40:59 2004 on bee with info_to_html version 0.9.6.