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BSD 2.11 - man page for as (bsd section 1)

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AS(1)											    AS(1)

NAME
       as - assembler

SYNOPSIS
       as [ -u ] [ -V ] [ -o objfile ] file ...

DESCRIPTION
       As assembles the concatenation of the named files.  The options are:

       -u     Treat all undefined symbols in the assembly as external globals.

       -V     Produce an object suitable for loading into an automatic text overlaid program.

       -o     Use  objfil  for	the  name  of the resultant object.  If this is omitted, a.out is
	      used.  If no errors occurred during the assembly and if there  were  no  unresolved
	      external references, it is made executable.

       The  special  file  name  --  serves  two purposes.  It signals the end of all options and
       causes stdin to be read for input.  Thus it is now possible to pipe data to the assembler:

       /lib/cpp -E foo.s | sed -e ';^#;/;' | as -o foo.o --

       The file name -- may be placed between normal files, when EOF is  detected  on  stdin  the
       next file in the argument list is opened and read.

       If no input files are specified then stdin is read.

FILES
       /tmp/atm1 temporary
       a.out	 object

SEE ALSO
       adb(1), ld(1), nm(1), a.out(5)
       UNIX Assembler Manual by D. M. Ritchie

DIAGNOSTICS
       When  an  input	file  cannot  be  read, its name followed by a question mark is typed and
       assembly ceases.  When syntactic or semantic errors occur, a  single-character  diagnostic
       is typed out together with the line number and the file name in which it occurred.  Errors
       in pass 1 cause cancellation of pass 2.	The possible errors are:

       )  Parentheses error
       ]  Parentheses error
       <  String not terminated properly
       *  Indirection used illegally
       .  Illegal assignment to `.'
       a  Error in address
       b  Branch instruction is odd or too remote
       e  Error in expression
       f  Error in local (`f' or `b') type symbol
       g  Garbage (unknown) character
       i  End of file inside an if
       m  Multiply defined symbol as label
       o  Word quantity assembled at odd address
       p  `.' different in pass 1 and 2
       r  Relocation error
       u  Undefined symbol
       x  Syntax error

BUGS
       Syntax errors can cause incorrect line numbers in following diagnostics.

3rd Berkeley Distribution								    AS(1)
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