toolchain/38315: make: ?= should resolve LHS

[sjg%crufty.net@localhost]

>Number:         38315
>Category:       toolchain
>Synopsis:       make: ?= should resolve LHS
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Mar 26 23:15:00 +0000 2008
>Originator:     Simon J. Gerraty
>Release:        NetBSD 4.0
>Organization:
Zen Programming...
>Environment:
        
        
System: NetBSD void.crufty.net 2.0 NetBSD 2.0 (GENERIC) #0: Wed Dec 1 10:58:25 
UTC 2004 
builds@build:/big/builds/ab/netbsd-2-0-RELEASE/i386/200411300000Z-obj/big/builds/ab/netbsd-2-0-RELEASE/src/sys/arch/i386/compile/GENERIC
 i386
Architecture: i386
Machine: i386
>Description:
        
Given the makefile:

M=i386

V1.i386 = x86
V1.${M} ?= unknown

all:
        @echo ${V1.i386}

should output "x86" rather than "unknown"

>How-To-Repeat:
        
>Fix:
        

>Unformatted: