Re: [Buildroot] [PATCH] utils/brmake: filter output for parallel build

["Vincent Stehlé" <vincent.stehle@arm.com>]

On Fri, Oct 10, 2025 at 03:47:32PM +0200, Marcus Hoffmann via buildroot wrote:
(grep --line-buffered option)
> Ah, this makes sense, I think I have notices this delay here mostly in CI,
> where sometimes there's no output for minutes. This seems to improve that.

Hi Marcus,

This change of behaviour in your CI messages output rate is an unexpected side
effect!

I think that without any option, grep and sed adapt their output buffering
policy automatically in the same way, depending on what they are connected to (a
terminal or something else).

Now that sed is the last program in the pipeline, I would expect that it would
still buffer its output in your CI case, as grep was doing.

If you fancy, you could try to add the "--unbuffered" option to sed command line
and see if that changes its behaviour in your CI:

  |sed --unbuffered -E 's/^([0-9T:-]{19}) [[:print:]]*(.*>>> )/\1 \2/'

> 
> This should probably mentioned in the commit message.

The intention was to avoid any visible change in term of buffering; sed should
have replaced grep in that sense.

Best regards,
Vincent.
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