Re: [RFC PATCH v3 06/37] bpf tools: Introduce 'bpf' library to tools

[Wangnan (F)]

å 2015/5/19 1:35, Alexei Starovoitov åé:
> On 5/17/15 3:56 AM, Wang Nan wrote:
> > This is the first patch of libbpf. The goal of libbpf is to create a
> > standard way for accessing eBPF object files. This patch creates
> > Makefile and Build for it, allows 'make' to build libbpf.a and
> > libbpf.so, 'make install' to put them into proper directories.
> > Most part of Makefile is borrowed from traceevent. Before building,
> > it checks the existance of libelf in Makefile, and deny to build if
> > not found. Instead of throw an error if libelf not found, the error
> > raises in a phony target "elfdep". This design is to ensure
> > 'make clean' still workable even if libelf is not found.
> >
> > Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
> > ---
> ...
> > +
> > +# Version of eBPF elf file
> > +FILE_VERSION = 1
>
> what that comment suppose to mean?

The format of eBPF objects can be improved in futher. A version number
here is the precaution of backward compatibility. However this patch doesn't
utilize it.

I'd like to append a 'format' section into eBPF object format to let 
libbpf know
the version of the object. What do you think?

Thank you.

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