linux-kernel - Re: [PATCH v2] x86, selftests: Add sigreturn

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Message-ID: <CALCETrU2tcRt+AVwVN3z6cSev4g824b7gndBt+QT1ZU+nm63kQ@mail.gmail.com>
Date:	Tue, 10 Mar 2015 06:17:59 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Shuah Khan <shuah.kh@...sung.com>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH v2] x86, selftests: Add sigreturn_32 selftest

On Mon, Mar 9, 2015 at 9:57 PM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Andy Lutomirski <luto@...capital.net> wrote:
>
>> On Mon, Mar 9, 2015 at 9:48 AM, Ingo Molnar <mingo@...nel.org> wrote:
>> >
>> > now I get this build failure:
>> >
>> > make[1]: Entering directory
>> > '/home/mingo/tip/tools/testing/selftests/x86'
>> > gcc -m32 -o sigreturn_32 -O2 -g -std=gnu99 -pthread -Wall  sigreturn.c -lrt -ldl
>> > In file included from /usr/include/time.h:27:0,
>> >                  from sigreturn.c:13:
>> > /usr/include/features.h:374:25: fatal error: sys/cdefs.h: No such file or directory
>> >  #  include <sys/cdefs.h>
>> >                          ^
>> > compilation terminated.
>> > Makefile:18: recipe for target 'sigreturn_32' failed
>> > make[1]: *** [sigreturn_32] Error 1
>>
>> It builds for me on Ubuntu.
>>
>> It looks like your 32-bit build setup is broken.  The line that's
>> failing to compile is:
>>
>> #include <time.h>
>>
>> Are you missing 32-bit headers?  This test *can't* be run as a 64-bit binary.
>
> Yeah, was a relatively fresh testbox, the magic incantation to get it
> to build there was:
>
>   apt-get install gcc-multilib libc6-i386 libc6-dev-i386
>
> On Fedora it's:
>
>   yum install glibc-devel.*i686
>
> Might make sense to include that in a README or so.

I could rig up the makefile to give that hint.

Should we just say that selftests/x86 won't work if you can't build
32-bit binaries, or should we try to degrade more gracefully?

--Andy

>
> Thanks,
>
>         Ingo



-- 
Andy Lutomirski
AMA Capital Management, LLC
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