[U-Boot] Fwd: Parallel build is broken

[Andy Shevchenko]

On Tue, Sep 4, 2018 at 6:47 PM Andy Shevchenko
<andy.shevchenko at gmail.com> wrote:
>
> On Tue, Sep 4, 2018 at 6:14 PM Tom Rini <trini at konsulko.com> wrote:
> > On Tue, Sep 04, 2018 at 05:50:33PM +0300, Andy Shevchenko wrote:
> > > On Tue, Sep 4, 2018 at 5:00 PM Tom Rini <trini at konsulko.com> wrote:
> > > > On Tue, Sep 04, 2018 at 03:42:05PM +0300, Andy Shevchenko wrote:
>
> > > make clean && make edison_defconfig && make -j16
> > >
> > > gcc (Debian 8.2.0-4) 8.2.0
> > > Copyright (C) 2018 Free Software Foundation, Inc.
> > > This is free software; see the source for copying conditions.  There is NO
> > > warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> >
> > I assume this is on Debian/unstable?
>
> testing
>
> >  I can't directly replicate this on
> > my 24core (Debian/stretch) or 16core(Ubuntu/xenial) machines.  I'll
> > setup a chroot soon, but since you've said -j64 is fine there too I
> > suspect you have more cores than I.  This may be something you have to
> > bisect for us if I can't replicate it myself.  Can you confirm how many
> > cores you have?  I might be able to spin something up in Google compute.
>
> $ sed -n -e '/cpu cores/ { p; q }' /proc/cpuinfo
> cpu cores       : 22

Did few runs (~6) on this machine with -j4, no failures so far.
Reruning same with -j16 brings failure on ~2-3 iteration.

It seems the scope can be narrowed to:
- many cores build system, and
- Debian testing/unstable toolchain, and/or
- U-Boot build system

> OTOH, I tried on my desktop (where is unstable) and everything works
> fine with the same (-j16) command line on any gcc I tried.
> $ sed -n -e '/cpu cores/ { p; q }' /proc/cpuinfo
> cpu cores       : 4



-- 
With Best Regards,
Andy Shevchenko