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From: hunt@spar.SPAR.SLB.COM (Neil Hunt)
Newsgroups: comp.lang.c
Subject: cpp bug
Message-ID: <66@spar.SPAR.SLB.COM>
Date: Wed, 18-Nov-87 20:49:35 EST
Article-I.D.: spar.66
Posted: Wed Nov 18 20:49:35 1987
Date-Received: Sat, 21-Nov-87 12:01:57 EST
Reply-To: hunt@spar.UUCP (Neil Hunt)
Organization: SPAR - Schlumberger Palo Alto Research
Lines: 37

The following fragment is the boiled down version of some lines
from a C program which was automatically translated from pascal,
and which breaks the cpp on my machine (a Sun 3, 3.2).

% cat test.c
#define l(a)	1

f()
{
	l(
	a); l(
	a)
}
% /lib/cpp test.c
# 1 "test.c" 


f()
{
	 1; # 7 "test.c" 
 1
# 8 "test.c" 
}
%

Of course, the # 7 "test.c" should have been on a line on its own,
not tagged onto the end of the previous line. The compiler complains
about illegal characters and other problems !.

It can be fixed by rearranging almost anything in the test fragment.
The problem seems to be triggered by the occurrence of the start of an
incomplete macro call on the same line as the end of the completion
of another macro call.

I would be very interested to know if anyone else's C cpp exhibits
this problem !

Neil/.