bin/42628: unifdef is broken

[dyoung%ojctech.com@localhost]

>Number:         42628
>Category:       bin
>Synopsis:       unifdef is broken
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jan 16 19:00:00 +0000 2010
>Originator:     David Young
>Release:        NetBSD 5.99.23
>Organization:
David Young             OJC Technologies
dyoung%ojctech.com@localhost      Urbana, IL * (217) 278-3933
>Environment:
System: NetBSD elmendorf.ojctech.com 5.99.23 NetBSD 5.99.23 (GENERIC) #15: Thu 
Jan 7 18:46:33 CST 2010 
dyoung%cuw.ojctech.com@localhost:/u5/dyoung-scratch/pristine/i386/O/sys/arch/i386/compile/GENERIC
 i386
Architecture: i386
Machine: i386
>Description:
unifdef -Usym is not removing lines bracketed
by #if defined(sym)/#endif.
>How-To-Repeat:
Try this:

unifdef -U__FreeBSD__ <<EOF
#if defined(__FreeBSD__)
#include <netinet/if_fddi.h>
#else
#include <net/if_fddi.h>
#endif
EOF

The output is the same as the input:

#if defined(__FreeBSD__)
#include <netinet/if_fddi.h>
#else
#include <net/if_fddi.h>
#endif

Ditto the output of unifdef -U __FreeBSD__ (i.e., with a space between
the -U and its argument).

>Fix:
Unknown.