From: Arnd Bergmann <arnd@kernel.org>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Masahiro Yamada <masahiroy@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Miguel Ojeda <ojeda@kernel.org>,
Fangrui Song <maskray@google.com>,
Michal Marek <michal.lkml@markovi.net>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
clang-built-linux <clang-built-linux@googlegroups.com>,
Christoph Hellwig <hch@infradead.org>,
Nathan Chancellor <nathan@kernel.org>
Subject: Re: [PATCH v2 2/2] Makefile: infer CROSS_COMPILE from SRCARCH for LLVM=1 LLVM_IAS=1
Date: Tue, 27 Jul 2021 09:49:09 +0200 [thread overview]
Message-ID: <CAK8P3a2kb2Zzgd1wvi4m2fJeHWA9aONXUriEVfnsOfYTquJ3eA@mail.gmail.com> (raw)
In-Reply-To: <CAMuHMdVzNFqAdxK+QTp7ub7LyhDL_3GbVMoAah_s3nGuJ5JN_Q@mail.gmail.com>
On Tue, Jul 27, 2021 at 9:07 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> On Mon, Jul 26, 2021 at 10:27 PM Eric W. Biederman <ebiederm@xmission.com> wrote:
> > Masahiro Yamada <masahiroy@kernel.org> writes:
> > > On Wed, Jul 21, 2021 at 4:58 AM Arnd Bergmann <arnd@kernel.org> wrote:
> >
> > Does anyone have any ideas?
> >
> > Something so we don't have to specify all of these variables on the make
> > command line would be nice.
>
> Just including the main Makefile does not work.
> That's why I went with the more convoluted solution in
> https://lore.kernel.org/linux-kbuild/CAMuHMdXJBqrpzaSNDJgic14ESiHV6cCcb_5E-st6iniXdmm9_g@mail.gmail.com/
This is roughly what I use as well, but it does have the downside that
it confuses
the inner 'make' when you build multiple targets in parallel, e.g.
make -skj30 kernel/ mm/ init/
works with the normal Makefile, but fails spectacularly with my nested
GNUmakefile because it starts multiple sub-processes that each try to
build the same preparation files (I did not try your version).
What I had in mind was to use something like (but not exactly)
-include $(O)/Makefile.cross
to conditionally include another file from the top-level Makefile before
doing anything else.
Arnd
next prev parent reply other threads:[~2021-07-27 7:49 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-08 23:25 [PATCH v2 0/2] infer CROSS_COMPILE from SRCARCH for LLVM=1 LLVM_IAS=1 Nick Desaulniers
2021-07-08 23:25 ` [PATCH v2 1/2] Makefile: move initial clang flag handling into scripts/Makefile.clang Nick Desaulniers
2021-07-09 20:12 ` Nathan Chancellor
2021-07-08 23:25 ` [PATCH v2 2/2] Makefile: infer CROSS_COMPILE from SRCARCH for LLVM=1 LLVM_IAS=1 Nick Desaulniers
2021-07-09 20:44 ` Nathan Chancellor
2021-07-20 8:04 ` Masahiro Yamada
2021-07-20 17:30 ` Nathan Chancellor
2021-07-21 3:49 ` Masahiro Yamada
2021-07-28 18:59 ` Nick Desaulniers
2021-07-28 22:35 ` Masahiro Yamada
2021-07-20 17:42 ` Linus Torvalds
2021-07-20 19:58 ` Arnd Bergmann
2021-07-20 20:18 ` Nick Desaulniers
2021-07-21 4:04 ` Masahiro Yamada
2021-07-23 19:54 ` Geert Uytterhoeven
2021-07-24 13:46 ` Masahiro Yamada
2021-07-26 20:27 ` Eric W. Biederman
2021-07-27 7:07 ` Geert Uytterhoeven
2021-07-27 7:49 ` Arnd Bergmann [this message]
2021-07-27 7:55 ` Geert Uytterhoeven
2021-07-27 8:21 ` Arnd Bergmann
2021-07-27 10:10 ` Masahiro Yamada
2021-07-27 14:16 ` Eric W. Biederman
2021-07-27 15:45 ` Masahiro Yamada
2021-07-27 18:46 ` Eric W. Biederman
2021-07-28 22:31 ` Masahiro Yamada
2021-07-20 20:52 ` Nick Desaulniers
2021-07-20 21:11 ` Linus Torvalds
2021-07-20 21:27 ` Nick Desaulniers
2021-07-21 4:53 ` Masahiro Yamada
2021-07-20 21:29 ` Nick Desaulniers
2021-07-20 21:54 ` Linus Torvalds
2021-07-20 23:19 ` Linus Torvalds
2021-07-20 23:22 ` Linus Torvalds
2021-07-21 5:12 ` Masahiro Yamada
2021-07-21 4:52 ` Christoph Hellwig
2021-07-21 5:33 ` Masahiro Yamada
2021-07-21 4:31 ` Masahiro Yamada
2021-07-21 4:44 ` Christoph Hellwig
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