linux-kernel - Re: [PATCH] perf data: Fix babeltrace detection

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Date:   Fri, 11 Oct 2019 08:27:44 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Andi Kleen <andi@...stfloor.org>, acme@...nel.org,
        jolsa@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf data: Fix babeltrace detection

On Fri, Oct 11, 2019 at 04:05:48PM +0200, Jiri Olsa wrote:
> On Tue, Oct 08, 2019 at 07:21:44AM -0700, Andi Kleen wrote:
> > On Tue, Oct 08, 2019 at 01:52:40PM +0200, Jiri Olsa wrote:
> > > On Mon, Oct 07, 2019 at 10:41:20AM -0700, Andi Kleen wrote:
> > > > From: Andi Kleen <ak@...ux.intel.com>
> > > > 
> > > > The symbol the feature file checks for is now actually in -lbabeltrace,
> > > > not -lbabeltrace-ctf, at least as of libbabeltrace-1.5.6-2.fc30.x86_64
> > > > 
> > > > Always add both libraries to fix the feature detection.
> > > 
> > > well, we link with libbabeltrace-ctf.so which links with libbabeltrace.so
> > > 
> > > I guess we can link it as well, but where do you see it fail?
> > 
> > On FC30 the .so file is just a symlink, so it doesn't pull
> > in the other library.
> > 
> > $ gcc test-libbabeltrace.c -lbabeltrace-ctf
> > /usr/bin/ld:
> > /usr/lib/gcc/x86_64-redhat-linux/9/../../../../lib64/libbabeltrace-ctf.so:
> > undefined reference to `bt_packet_seek_get_error'
> > /usr/bin/ld:
> > /usr/lib/gcc/x86_64-redhat-linux/9/../../../../lib64/libbabeltrace-ctf.so:
> > undefined reference to `bt_packet_seek_set_error'
> > collect2: error: ld returned 1 exit status
> 
> I'm confused,
> the test-libbabeltrace.c checks for bt_ctf_stream_class_get_packet_context_type
> which is in libbabeltrace-ctf:

AFAIK libbabeltrace-ctf uses these symbols from the object containing
bt_ctf_stream_class_get_packet_context_type

I assume you have FC30 so you should be able to reproduce it

-Andi