[Bug 233265] 'make -V MAKEOBJDIRPREFIX' at the top of base source tree doesn't work if value of MAKEOBJDIRPREFIX is customized

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233265

--- Comment #2 from Simon J. Gerraty <sjg@FreeBSD.org> ---
Should the clobbering of MAKEOBJDIRPREFIX be dependent on MK_DIRDEPS_BUILD=yes
?
Since it originally make from local.meta.sys.mk?

I note too that there are two blocks in src.sys.obj.mk guarded by

.if !empty(MAKEOBJDIRPREFIX)

but since the first one clobbers MAKEOBJDIRPREFIX, the 2nd one should never be
entered.

I know the traditional freebsd build plays games with MAKEOBJDIRPREFIX,
but wondering what the motive was for clobbering it outside the context of
DIRDEPS_BUILD - where use of MAKEOBJDIR is relied upon to ensure that the same
RELDIR is valid in src and object trees.

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