Re: [PATCH] tracing: install trace events file only if necessary

[Carlos Santos <casantos@redhat.com>]

On Mon, Mar 27, 2023 at 11:42 AM Daniel P. Berrangé <berrange@redhat.com> wrote:
>
> On Mon, Mar 27, 2023 at 11:28:05AM -0300, Carlos Santos wrote:
> > On Mon, Mar 27, 2023 at 6:23 AM Daniel P. Berrangé <berrange@redhat.com> wrote:
> > >
> > > On Sun, Mar 26, 2023 at 06:04:46PM -0300, casantos@redhat.com wrote:
> > > > From: Carlos Santos <casantos@redhat.com>
> > > >
> > > > It is required only if linux-user, bsd-user or system emulator is built.
> > > >
> > > > Signed-off-by: Carlos Santos <casantos@redhat.com>
> > > > ---
> > > >  trace/meson.build | 2 +-
> > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > >
> > > > diff --git a/trace/meson.build b/trace/meson.build
> > > > index 8e80be895c..3fb41c97a4 100644
> > > > --- a/trace/meson.build
> > > > +++ b/trace/meson.build
> > > > @@ -64,7 +64,7 @@ trace_events_all = custom_target('trace-events-all',
> > > >                                   input: trace_events_files,
> > > >                                   command: [ 'cat', '@INPUT@' ],
> > > >                                   capture: true,
> > > > -                                 install: true,
> > > > +                                 install: have_linux_user or have_bsd_user or have_system,
> > >
> > > Trace events are used by our command line tools too qemu-img, qemu-io,
> > > qemu-nbd, qemu-pr-helper, qemu-storage-daemon.
> > >
> > > What build scenario are you seeing that does NOT want the trace events
> > > to be present ?   If there is any, then I might even call that situation
> > > a bug, as we want trace events to be available as a debugging mechanism
> > > for everything we build.
> >
> > I'm aiming for an embedded system or a VM image that only needs
> > qemu-ga, in which qemu is built with --enable-trace-backends=nop.
>
> How about
>
>   install:   get_option('trace_backends') != 'nop'
>
> ?

That would be perfect :-)

-- 
Carlos Santos
Senior Software Maintenance Engineer
Red Hat
casantos@redhat.com    T: +55-11-3534-6186