Re: vdso_standalone_test_x86.c build failure on Linus' tree

From: Peter Foley
Date: Wed Oct 08 2014 - 15:45:04 EST

On Wed, Oct 8, 2014 at 3:16 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> 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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