iproute2 fails to build setting LIBBPF_DYNAMIC unless LIBBPF_DIR is defined.

[Neil Kettle]

OK I wiped the entire thing and pulled a fresh repo, same config for both devices, same problems.

I revert the iproute2 update commit, b048a305a3d3cbb5375e32757e70aa129b4c7c4f, builds just fine, I suspect there is some interplay between the default image config in relation to iproute2 and libbpf and my config (and I suspect Rui too).
No time to debug this myself outside what I did previous to patch around the errors, so I’ve just reverted that commit and downgraded Iproute2 to the known good version and will keep the rest up to date until it ’solves’ itself (or something breaks due to relying on the new versions, which I would doubt).

> On 11 Mar 2021, at 10:01, Rui Salvaterra <rsalvaterra at gmail.com> wrote:
> 
> Hi, guys!
> 
> On Thu, 11 Mar 2021 at 09:25, <itugrok at yahoo.com> wrote:
>> 
>> The issue with limits.h was exactly one of those intermittent, hard-to-reproduce problems recently reported (by Rui Salvaterra), with similar patches being shared. As in your case, having builds by buildbots and others routinely succeed raises doubts about the root problem. See for example: https://freenode.irclog.whitequark.org/openwrt-devel/2021-03-08#29320461. I also believe doing a "make dirclean" was only one of the things Rui tried before before his builds started succeeding, but I'll let him comment further. And as I noted on IRC, I'd still like to see a patch upstreamed.
> 
> In my situation, make dirclean doesn't help, only patching the
> relevant files to include limits.h. However, my reluctance to send an
> upstream patch comes from the fact that I didn't have any problems
> building the iproute2 tools manually (cloning
> git://git.kernel.org/pub/scm/network/iproute2/iproute2.git and running
> make all).
> 
> Cheers,
> Rui
> 
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