``make buildkernel'' fails when /usr/obj is empty

[Gary Jennejohn]

On Thu, 31 May 2018 09:52:22 +0200
Gary Jennejohn <gljennjohn at gmail.com> wrote:

> There's something totally screwy about trying to build a kernel when
> /usr/obj is not populated.
> 
> I ran ``make clean'' in /usr/src and then ``make buildkernel''.  This
> fails with
> 	make[2]: "/usr/src/sys/conf/kern.pre.mk" line 125: amd64 kernel
> 	requires linker ifunc support
> 
> This is total BS because
> 
> /usr/bin/ld --version
> LLD 6.0.0 (FreeBSD 326565-1200002) (compatible with GNU linkers)
> 
> which is exactly what bsd.linker.mk is looking for to set ifunc.
> 
> If I do this:
> 
> mkdir -p /usr/obj/usr/src/amd64.amd64/tmp/legacy/usr/bin
> cp /usr/bin/ld /usr/obj/usr/src/amd64.amd64/tmp/legacy/usr/bin
> 
> the buildkernel then succeeds.
> 
> Considering that (reformatted output from make)
> 
> PATH=/usr/obj/usr/src/amd64.amd64/tmp/legacy/usr/sbin:
> /usr/obj/usr/src/amd64.amd64/tmp/legacy/usr/bin:
> /usr/obj/usr/src/amd64.amd64/tmp/legacy/bin:
> /usr/obj/usr/src/amd64.amd64/tmp/usr/sbin:
> /usr/obj/usr/src/amd64.amd64/tmp/usr/bin:
> /sbin:/bin:/usr/sbin:/usr/bin
> 
> it seems like /usr/bin/ld should be found by bsd.linker.mk and no
> error should be reported.
> 

OK, it seems that ``make clean'' does not remove the contents of
/usr/obj/usr/src/amd64.amd64/tmp/legacy.  If I delete everything
under /usr/obj then ``make buildkernel'' works.

Still, it seems pretty strange to me to make building a kernel
depend on some random junk which is left laying around under
/usr/obj.

-- 
Gary Jennejohn