bin/55057: config(1) processing of elif{,n}def broken

[paul%whooppee.com@localhost]

>Number:         55057
>Category:       bin
>Synopsis:       config(1) processing of elif{,n}def broken
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 07 18:15:01 +0000 2020
>Originator:     Paul Goyette
>Release:        NetBSD 9.99.46
>Organization:
+--------------------+--------------------------+-----------------------+
| Paul Goyette       | PGP Key fingerprint:     | E-mail addresses:     |
| (Retired)          | FA29 0E3B 35AF E8AE 6651 | paul%whooppee.com@localhost     |
| Software Developer | 0786 F758 55DE 53BA 7731 | pgoyette%netbsd.org@localhost   |
+--------------------+--------------------------+-----------------------+
>Environment:
	
	
System: NetBSD speedy.whooppee.com 9.99.46 NetBSD 9.99.46 (SPEEDY 2020-02-07 16:26:35 UTC) #1: Fri Feb 7 19:37:58 UTC 2020 paul%speedy.whooppee.com@localhost:/build/netbsd-local/obj/amd64/sys/arch/amd64/compile/SPEEDY amd64
Architecture: x86_64
Machine: amd64
>Description:
The construct

	if attr1
		defflag X
	elifdef attr2
		defflag Y
	else
		defflag Y : Z
	endif

is broken.  It appears to execute both "Y" commands, resulting in an
error message (due to redefinition of Y).
	
>How-To-Repeat:
	
>Fix:
Unknown.

However, the following is a workaround (although it increases the
depth of the if...endif code):

	if attr1
		defflag X
	else
	if attr2
		defflag Y
	else
	if attr3
		defflag Y : Z
	endif
	endif
	endif
	

>Unformatted: