linux-kernel - Re: vdso_standalone_test_x86.c build failure on Linus' tree

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Message-ID: <CAOFdcFP=z4Tn-Zt6cuujGABWPDQrCy4=LzXHndB5rzFnEdyvXw@mail.gmail.com>
Date:	Wed, 8 Oct 2014 15:44:37 -0400
From:	Peter Foley <pefoley2@...oley.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Josh Boyer <jwboyer@...oraproject.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Jiri Kosina <jkosina@...e.cz>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: vdso_standalone_test_x86.c build failure on Linus' tree

On Wed, Oct 8, 2014 at 3:16 PM, Andy Lutomirski <luto@...capital.net> wrote:
> It should build and work on 32-bit.
>
> Except that the makefile is totally bogus.  vdso_standalone_test isn't
> a hostprog at all.  It's a target prog.  But kbuild doesn't understand
> that, so I have no idea what, if anything, that makefile is supposed
> to do.
The idea is to increase build testing for targets in Documentation,
but I didn't really consider cross-compiling those targets.

>
> I would argue that the whole documentation build system should be
> fixed to cross-compile or should just be disabled for cross-builds if
> glibc isn't available.
It might make sense to just completely disable CONFIG_BUILD_DOCSRC if
we're cross-compiling.

>
> FWIW, the comment at the top of vdso_standalone_test_x86.c documents
> *exactly* how to build it, and it works if you build it like that.

So, it looks like 32bit needs -lgcc_s
I'll whip up a patch to add that.
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