linux-kernel - Re: [PATCH 1/3] um: fix parallel building with O= option

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Date:   Sat, 15 Sep 2018 11:47:07 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Jeff Dike <jdike@...toit.com>, Richard Weinberger <richard@....at>,
        linux-um@...ts.infradead.org, Randy Dunlap <rdunlap@...radead.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Sam Ravnborg <sam@...nborg.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] um: fix parallel building with O= option

On Fri, Aug 3, 2018 at 9:47 PM, Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> Randy Dunlap reports UML occasionally fails to build with -j<N> and
> O=<builddir> options.

With v4.19-rc2 I'm still seeing a failure (for any parallelism) under ARCH=um

$ make -j8 ARCH=um O=/tmp/foo
...
/home/kees/src/linux-build/um/Makefile:1185: *** Headers not
exportable for the um architecture.  Stop.

Am I missing something?

-Kees

-- 
Kees Cook
Pixel Security