Re: [PATCH] poky-tiny: Enable x86-64 to build eglibc correctly

From: Darren Hart <dvhart@linux.intel.com>
To: Khem Raj <raj.khem@gmail.com>
Cc: openembedded-core@lists.openembedded.org
Subject: Re: [PATCH] poky-tiny: Enable x86-64 to build eglibc correctly
Date: Thu, 06 Sep 2012 10:47:09 -0700	[thread overview]
Message-ID: <5048E19D.5030305@linux.intel.com> (raw)
In-Reply-To: <CAMKF1sr=pHa21ihb5y6m9tkLYV4zG2__hWkBBZML=S9eRZhZfw@mail.gmail.com>

On 08/30/2012 02:49 PM, Khem Raj wrote:
> On Thu, Aug 30, 2012 at 12:48 PM, Saul Wold <sgw@linux.intel.com> wrote:
>> The libc-libm-big option allows eglibc to correctly configure
>> itself to include the correct math functions for 64bit operations
>>
>> [YOCTO #2943]
>>
>> Signed-off-by: Saul Wold <sgw@linux.intel.com>
>> ---
>>  meta-yocto/conf/distro/poky-tiny.conf |    1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/meta-yocto/conf/distro/poky-tiny.conf b/meta-yocto/conf/distro/poky-tiny.conf
>> index 8ae1d85..bfb4432 100644
>> --- a/meta-yocto/conf/distro/poky-tiny.conf
>> +++ b/meta-yocto/conf/distro/poky-tiny.conf
>> @@ -63,6 +63,7 @@ ASSUME_PROVIDED += "pkgconfig$"
>>  # Reconfigure eglibc for a smaller installation
>>  # Comment out any of the lines below to disable them in the build
>>  DISTRO_FEATURES_LIBC_TINY = "libc-libm libc-crypt"
>> +DISTRO_FEATURES_LIBC_TINY_append_x86-64 = " libc-libm-big"
>>
>>  # Required for "who"
>>  DISTRO_FEATURES_LIBC_MINIMAL = "libc-utmp libc-getlogin"
> 
> 
> there is a bug in eglibc if it cant build without libc-libm-big
> it should have not caused any undefined symbol failures because
> all it should have done is not use double precision so your computations
> will be less accurate.

Agreed.

~200K is significant when we are talking about < 4MB images. However, so
long as we track the eglibc bug, I am fine with including this
workaround to get things going.

I would ask that a comment be added which calls this out as a workaround
for the eglibc bug (a bug number would be great).

Thanks,

Darren

> 
>> --
>> 1.7.9.5
>>
>>
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-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Technical Lead - Linux Kernel