Re: linux-next: build failure after merge of the bpf-next tree

Hi Alexei,

On Mon, 24 Aug 2020 18:25:44 -0700 Alexei Starovoitov [off-list ref] wrote:

On Mon, Aug 24, 2020 at 6:20 PM Stephen Rothwell [off-list ref] wrote:

quoted

On Fri, 21 Aug 2020 11:11:11 +1000 Stephen Rothwell [off-list ref] wrote:  

quoted

After merging the bpf-next tree, today's linux-next build (x86_64
allmodconfig) failed like this:

Auto-detecting system features:
...                        libelf: [  [31mOFF [m ]
...                          zlib: [  [31mOFF [m ]
...                           bpf: [  [32mon [m  ]

No libelf found
make[5]: *** [Makefile:284: elfdep] Error 1

Caused by commit

  d71fa5c9763c ("bpf: Add kernel module with user mode driver that populates bpffs.")

[For a start, can we please *not* add this verbose feature detection
output to the nrormal build?]

This is a PowerPC hosted cross build.

I have marked BPF_PRELOAD as BROKEN for now.  

Still getting this failure ...  

I don't have powerpc with crosscompiler to x86 to reproduce.
What exactly the error?

Just as above.

bpf_preload has:
"depends on CC_CAN_LINK"
which is exactly the same as bpfilter.
You should have seen this issue with bpfilter for years now.

Well, I haven't :-)  It just started the other day when that commit
appeared.

-- 
Cheers,
Stephen Rothwell