i960-only options:
[-ACA|-ACA_A|-ACB|-ACC|-AKA|-AKB|-AKC|-AMC]
[-b]
[-norelax]
m680x0-only options:
[-l]
[-mc68000|-mc68010|-mc68020]
For information on the syntax and pseudo-ops used by GNU as, see `as' entry in info (or the manual Using as: The GNU Assembler ).
as is primarily intended to assemble the output of the GNU C compiler gcc for use by the linker ld. Nevertheless, we've tried to make as assemble correctly everything that the native assembler would. This doesn't mean as always uses the same syntax as another assembler for the same architecture; for example, we know of several incompatible versions of 680x0 assembly language syntax.
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.)
If as is given 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.
as may write warnings and error messages to the standard error file (usually your terminal). This should not happen when as is run automatically by a compiler. Warnings report an assumption made so that as could keep assembling a flawed program; errors report a grave problem that stops the assembly.
Options may be in any order, and may be before, after, or between file names. The order of file names is significant.
`--' (two hyphens) by itself names the standard input file explicitly, as one of the files for as to assemble.
Except for `--' any command line argument that begins with a hyphen (`-') is an option. Each option changes the behavior of as. No option changes the way another option works. An option is a `-' followed by one or more letters; the case of the letter is important. All options are optional.
The `-o' option expects exactly one file name to follow. The file name may either immediately follow the option's letter (compatible with older assemblers) or it may be the next command argument (GNU standard).
These two command lines are equivalent:
as -o my-object-file.o mumble.s
as -omy-object-file.o mumble.s
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Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one.
Permission is granted to copy and distribute translations of this manual into another language, under the above conditions for modified versions, except that this permission notice may be included in translations approved by the Free Software Foundation instead of in the original English.