linux-kernel - Re: [PATCH] tools/rtla: Explicitly list libtraceevent dependency

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Date:   Tue, 10 Jan 2023 15:08:14 +0100
From:   Daniel Wagner <dwagner@...e.de>
To:     Daniel Bristot de Oliveira <bristot@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        linux-trace-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tools/rtla: Explicitly list libtraceevent dependency

On Tue, Jan 10, 2023 at 02:55:03PM +0100, Daniel Bristot de Oliveira wrote:
> On 1/10/23 14:18, Daniel Wagner wrote:
> > The current libtracefs.pkg file lists the dependency on
> > libtraceevent ("pkg-config --libs libtracefs" -> "-ltracefs
> > -ltraceevent").
> > 
> > Dan Nicholson's Guide to pkg-config[1] stats that "Libs: The link
> > flags specific to this package and any required libraries that don't
> > support pkg-config". Thus the current libtracefs.pkg is not correct.
> > 
> > rtla is depending on libtraceevent but it doesn't express this in
> > 'pkg-config' part to retrieve the correct build flags.
> > 
> > In order to be able to update the "Libs:" section in the libtracefs
> > project we need to list the dependency explicitly to avoid future linker
> > failures.
> 
> I am ok with it. Steve?

FWIW, this is change is also backwards compatible, meaning if you have system
which has a libtracefs.pkg installed which lists libtraceevent in its Libs:
section the 'pkg-config --libs libtracefs libtraceevent' command will return the
identically string which is '-ltracefs -ltraceevent'.