linux-kernel - Re: [RFC/fix] Re: libbpf build broken on musl libc (Alpine Linux)

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Date:   Thu, 13 Sep 2018 16:44:41 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Hendrik Brueckner <brueckner@...ux.ibm.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Networking Development Mailing List 
        <netdev@...r.kernel.org>
Subject: Re: [RFC/fix] Re: libbpf build broken on musl libc (Alpine Linux)

Em Thu, Sep 13, 2018 at 11:56:31AM -0700, Alexei Starovoitov escreveu:
> On Thu, Sep 13, 2018 at 03:32:40PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Sep 11, 2018 at 02:24:53PM -0700, Alexei Starovoitov escreveu:
> > > On Tue, Sep 11, 2018 at 09:15:43AM -0300, Arnaldo Carvalho de Melo wrote:
> > > > Em Tue, Sep 11, 2018 at 12:22:18PM +0200, Jakub Kicinski escreveu:
> > > > > On Mon, 10 Sep 2018 14:29:03 -0300, Arnaldo Carvalho de Melo wrote:
> > > > > > After lunch I'll work on a patch to fix this, 
> > > > > Any luck?
> > 
> > > > Well, we need to apply the patch below and make tools/lib/str_error_r.c
> > > > live in a library that libbpf and perf is linked to.
> >  
> > > do you want us to take the patch or you're applying it yourself?
> > 
> > Please do some testing with my perf/libbpf+str_error_r branch, it has
> > two patches to get this fixed, the one I sent and a prep one making
> > libbpf link against libapi.
> > 
> > [acme@...et perf]$ git log --oneline -2
> > a7ab924b7fec (HEAD -> perf/urgent, acme.korg/perf/libbpf+str_error_r) tools lib bpf: Use str_error_r() to fix the build in Alpine Linux
> > fb4a79e04c2b tools lib bpf: Build and link to tools/lib/api/
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/commit/?h=perf/libbpf%2bstr_error_r&id=fb4a79e04c2b37ee873a3b31a3250925cf466fff
> we cannot do this.
> lib/api is GPL we cannot use it in LGPL library.

Humm, I wrote tools/lib/str_error_r.c, so I can possibly relicense it as
LGPL and then link just that one, as I did in one of my local patches.

The only line that is not from me in tha file is from Josh Poinboeuf,
which I CCed here.

- Arnaldo