[Buildroot] Silencing the build

[Yann E. MORIN <yann.morin.1998@free.fr>]

Fabio, All,

On 2014-07-18 10:18 +0200, Fabio Porcedda spake thusly:
> On Thu, Jul 17, 2014 at 10:29 PM, Yann E. MORIN <yann.morin.1998@free.fr> wrote:
> > Thomas, All,
> >
> > On 2014-07-17 20:31 +0200, Thomas Petazzoni spake thusly:
> >> On Thu, 17 Jul 2014 19:40:46 +0200, Fabio Porcedda wrote:
> >>
> >> > > Hum, yes, but why? The entire build process is anyway very noisy, so is
> >> > > there really a point in silencing specifically this part? What is the
> >> > > ultimate goal you're trying to achieve here?
> >> >
> >> > My ultimate goal is to be able using the "-s" flags to silence all
> >> > parts, because sometimes i just want to build and view only ">>> *"
> >> > messages, errors, warning without anything else.
> >> >
> >> > As example the "toolchain-external" target already do that when the
> >> > "-s" option is used.
> >> >
> >> > I've silenced only this part because it was easy and it's anyway an improvement.
> >> >
> >> > Maybe i can work on silencing other parts too if the feature is desired.
> >>
> >> Ok, thanks for the explanation.
> >>
> >> I guess we need to decide whether having a fully silent build in "make
> >> -s" is a goal we should aim at. It seems like a good idea to me, but I
> >> don't have a really strong opinion about this.
> >>
> >> What do others think about this?
> >
> > Here's what I use for a silent build:
> >
> >     brmake() {
> >         make "${@}" \
> >         |sed -r -e '/^.{4}>>>[[:space:]]+(.*).{5}$/!d; s//\1/;'
> >     }
> >
> > Then calling 'brmake' instead of 'make', will get you only the >>> lines.
> 
> Nice, so i'm not the only one who likes a silent build ;-)

Well, I still believe the build should be verbose by default, otherwise
we would miss a lot of important information on bug reports. The problem
is where to store the build.log in case of a silent build, so the user
can provide it.

I think the best we can do is document a simple solution (like my little
function above, for example).

> I think that a downside of this method is that even the stderr is
> filtered as well so messages like warning or errors are filtered as
> well.

No, because only stdout is filtered, there's no redirection of stderr.

Regards,
Yann E. MORIN.

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