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Date: Tue, 15 Jul 1997 11:40:52 -0700 (PDT)
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Subject: bin/4098: m4 divert/ifelse/decr interaction is broken
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>Number:         4098
>Category:       bin
>Synopsis:       m4 divert/ifelse/decr interaction is broken
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Jul 15 11:50:00 PDT 1997
>Last-Modified:
>Originator:     Mike Burgett
>Organization:
None
>Release:        FreeBSD 2.2-STABLE i386
>Environment:

  N/A

>Description:

m4 seems to be broken when processing statments of the type:

divert(ifelse(var,val,divnum,decr(divnum)))

which causes nested diversions to fail.  Interestingly, replacing
decr with incr, seems to work as expected, *really* making it interesting
when doing nested includes.

>How-To-Repeat:

define(`test1',0)dnl
define(`test2',1)dnl

Undiverted line #1
divert(ifelse(test1,1,divnum,decr(divnum)))dnl
Diverted line #1
divert(ifelse(test2,1,divnum,decr(divnum)))dnl
Diverted line #2
divert(ifelse(test2,1,divnum,incr(divnum)))dnl
Diverted line #3
divert(ifelse(test1,1,divnum,incr(divnum)))dnl
Undiverted line #1

Should only output the two undiverted lines.

>Fix:
	
Unknown
>Audit-Trail:
>Unformatted: