Re: [PATCH 00/10] bpf samples: Uses libbpf in tools/lib to do BPF operations

[Daniel Wagner <daniel.wagner@bmw-carit.de>]

On 12/18/2015 02:50 PM, pi3orama wrote:
>> Could it be that $(srcdir) somehow is not correct? I exchanged
>>
>>    feature_dir := $(srctree)/tools/build/feature
>> to
>>    feature_dir := /home/wagi/src/linux/tools/build/feature
>>
> 
> Can you remember the patch set I skipped?
> 
> http://lkml.kernel.org/g/1450316632-152513-4-git-send-email-wangnan0@huawei.com
> <http://lkml.kernel.org/g/1450316632-152513-1-git-send-email-wangnan0@huawei.com>

I'll give them a try next week.

> I thought that patch set is independent with this one but I was wrong.
> The reason
> of your problem is the missing of srctree. Could you please add the
> definition of
> srctree and try again? Like this:
> 
> +ifeq ($(srctree),)
> +srctree := $(patsubst %/,%,$(dir $(shell pwd)))
> +srctree := $(patsubst %/,%,$(dir $(srctree)))
> +srctree := $(patsubst %/,%,$(dir $(srctree)))
> +#$(info Determined 'srctree' to be $(srctree))
> +endif
> 
> At the head of tools/lib/bpf/Makefile

I tried that one but it didn't change unfortunately. I saw that code
snipped is already in tools/lib/bpf/Makefile line 62. It exists since

1b76c13e4b36 ("bpf tools: Introduce 'bpf' library and add bpf feature
check")