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From: cspw@quagga.ru.ac.za (Peter Wentworth)
Newsgroups: comp.lang.c
Subject: Many lines from a macro?
Message-ID: <1991Jan22.201702.1383@quagga.ru.ac.za>
Date: 22 Jan 91 20:17:02 GMT
Organization: Dept. of Computer Science, Rhodes University
Lines: 30


Can a C macro replacement ever result in more than one output line from
the preprocessing stage?

I am using the SUN assembler which first uses the C preprocessor.
The C macro

#define FOO       jmp label;\
                  nop;\
              label:

expands to this output:       jmp label;  nop;  label:

But the assembler insists that the label starts on a new line,
so this is not acceptable.  Is there some magic that will 
yield three separate lines of macro output, instead of one?

I don't think this can ever cause problems in C, but I suspect
there other languages that would benefit from using a general
standardized C preprocessor as a front end.  Was there ever any
notion among the ANSI committee that things like preprocessing
features could be included on grounds of 'general usefulness',
rather than 'useful only to C'?

Pete 

-- 
EP Wentworth - Dept. of Computer Science - Rhodes University - Grahamstown.
cspw@quagga.ru.ac.za  
  (If that fails, try cspw.quagga@f4.n494.z5.fidonet.org)