[Bug 267376] make installworld does not properly handle MAKEOBJDIRPREFIX correctly

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267376

            Bug ID: 267376
           Summary: make installworld does not properly handle
                    MAKEOBJDIRPREFIX correctly
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: rkoberman@gmail.com

I need to repair a system that panicked during "make installworld". It looks
like this happened during installing stand. In any case, the system would not
boot and conf.lua was there,  but very little will run and another "make
installworld" dies immediately with errors from rtld.

Since my /usr/obj directory was OK, I thought I could install from the install
memstick live system, but it fails with an obvious bug that I have been unable
to figure out. In Makefile.inc1, the script tries to pull in
$OBJTOP/toolchain-metadata.mk, but reports that $MAKEOBJDIRPREFIX does not
contain an object directory. So I checked the value of $OBJTOP.
$MAKEOBJDIRPREFIX was set to "/mnt/usr/obj", but OBJTOP was
"/mnt/usr/obj/mnt/usr/src/amd64.amd64". Note the extra /mnt in middle. 

Clearly the generation of OPBJTOP is broken. I've tried tracking this down, but
have, so far, failed. (See /usr/src/Makefile.inc1 line 105 and 106

The system is running the Live CD (memstick) from Oct 7.  The command is:
CC=mnt/usr/bin/cc LD=/mnt/usr/bin/ld MAKEOBJDIRPREFIX=/mnt/usr/obj make
installworld

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