[Buildroot] [PATCH v6 18/28] package/cmake: Fix for using -O in top-level make

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

On Thu, 12 Mar 2020 14:00:24 +0100
Arnout Vandecappelle <arnout@mind.be> wrote:

> > Reading
> > https://www.gnu.org/software/make/manual/html_node/Parallel-Output.html,
> > it seems like it is expected for -Otarget to behave like this.  
> 
> Indeed, looks exactly like expected.
> 
> > However,
> > if you use -Orecurse, it works as expected: the entire output of the
> > sub-make is buffered, and output in one-go when the make target at the
> > Buildroot level completes.
> > 
> > So I'm not sure we want to prevent -Otarget from doing what it does: we
> > should probably instead use -Orecurse.  
> 
> 
>  Where do we pass -Otarget to begin with?

We don't. But I guess Andreas is using "make -Otarget" as it is
using/testing top-level parallel build and it doesn't want messed up
build log.

>  There could be something to be set for globall resetting MAKEFLAGS and taking
> control over the make flags entirely from Buildroot infra when calling into
> package build systems. However, this is a bit complicated in make, and I'm not
> entirely convinced we really want that...

And I assume we wouldn't want to solve on that on a per-package basis,
but rather more globally for all packages.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com