building head -r338675 with devel/amd64-gcc: /usr/local/x86_64-unknown-freebsd12.0/bin/ld: warning: -z ifunc-noplt ignored

[Ed Maste]

On 23 September 2018 at 07:31, Michael Tuexen <tuexen at fh-muenster.de> wrote:
> Using this patch I was able to build/install world and kernel on an i386 system.
> However, after removing it, I can't build world then. When trying to compile a
> kernel "the old way" I end up with:
>
> tuexen at head:~/head/sys/i386/conf % config -g TCP
> WARNING: duplicate option `GEOM_PART_GPT' encountered.
> Kernel build directory is ../compile/TCP
> Don't forget to do ``make cleandepend && make depend''
> tuexen at head:~/head/sys/i386/conf % cd ../compile/TCP/
> tuexen at head:~/head/sys/i386/compile/TCP % make -j 6
> make: "../../../conf/../../../conf/kern.pre.mk" line 126: amd64/i386 kernel requires linker ifunc support
>
> This is r338893.
>
> amd64 works without any problem. So this is i386 specific. Any idea how to fix it?

This safety belt is in place to ensure we don't build a non-functional
kernel - now that the i386 kernel requires ifunc support using old GNU
ld results in a kernel that doesn't boot.

The workaround for the "old way" is to explicitly set LD=ld.lld in the
environment - "LD=ld.lld make -j 6" should work. More details in this
-arch thread, when amd64 encountered this hiccup:
https://lists.freebsd.org/pipermail/freebsd-arch/2018-May/018967.html

The same issue now affects i386 as it has started using ifuncs, and
will be resolved once we can switch i386's /usr/bin/ld to be lld,
which is waiting on ports fixes in PR214864.