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

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Message-ID: <20191008142143.ts5se4pzwfnfnbsh@two.firstfloor.org>
Date:   Tue, 8 Oct 2019 07:21:44 -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 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

$ ls -l /usr/lib64/libbabeltrace-ctf.so
lrwxrwxrwx 1 root root 26 Jan 31  2019 /usr/lib64/libbabeltrace-ctf.so
-> libbabeltrace-ctf.so.1.0.0

$ rpm -qf /usr/lib64/libbabeltrace-ctf.so
libbabeltrace-devel-1.5.6-2.fc30.x86_64

-Andi