GNU bug report logs - #20614
Segmentation fault when building on Power8 Little Endian

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From: Petr Hracek <phracek <at> redhat.com>
Cc: 20614 <at> debbugs.gnu.org
Subject: bug#20614: Segmentation fault when building on Power8 Little Endian
Date: Wed, 30 Sep 2015 12:39:47 +0200

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On 09/26/2015 09:58 AM, Eli Zaretskii wrote:
>> Cc: 20614 <at> debbugs.gnu.org
>> From: Petr Hracek <phracek <at> redhat.com>
>> Date: Thu, 24 Sep 2015 19:56:32 +0200
>>
>> On 09/24/2015 05:32 PM, Eli Zaretskii wrote:
>>>> From: Petr Hracek <phracek <at> redhat.com>
>>>> Date: Thu, 24 Sep 2015 13:04:30 +0200
>>>>
>>>> emacs: Program segment above .bss in
>>> I'm confused: earlier you said that you've commented out this error,
>>> and you still couldn't build Emacs with the latest Binutils.  What is
>>> the problem in that case?
>> Good point.
>> I didn't use a workaround in the latest mail. I use the clear emacs
>> tarball and added some
>> debug information so that we are able to detect and hopefully correct
>> the problem.
>> I would like to solve the problem. Not to use workaround :)
>>
>> The message emacs: Program segment above .bss causes fails
>> and emacs is not buildable still.
> Can you show the same series of messages emitted when Emacs is built
> with an older version of Binutils?
My deep observation with emacs package and binutils:
1) binutils-2.23.52.0.1-30.el7_1.2.ppc64le.rpm works completely.
2) binutils-2.23.52.0.1-40.el7.ppc64le.rpm works if row 
http://git.savannah.gnu.org/cgit/emacs.git/tree/src/unexelf.c?h=emacs-24#n869
is suppressed.

With newer version of binutils I can see the same series:(
like:
Dumping under the name emacs
emacs: Program segment above .bss in 
/builddir/build/BUILD/emacs-24.3/src/temacs
make[2]: Leaving directory `/builddir/build/BUILD/emacs-24.3/src'
make[2]: *** [bootstrap-emacs] Error 1

I have collected list of commits and messages against upstream:
#1200138 
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=43a8475ca01b676fb764aaed0c4ed1cc16fc3c87 
#1200138 
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=eec2f3ed9f053653ed5d629eb50e08e3ee61e9bd 
#1203449 https://bugzilla.redhat.com/attachment.cgi?id=1003499 # 1175624 
.opd https://sourceware.org/ml/binutils/2015-01/msg00227.html
# 1175624 .got which implies .sdata, .sbss, .plt .iplt and .branch_lt 
also have to move: https://sourceware.org/ml/binutils/2015-01/msg00228.html
# 1175624 And .toc1: 
https://sourceware.org/ml/binutils/2015-01/msg00232.html
#1194164 func <at> localentry expressions, which was added to FSF binutils 
with git commit 45965137
#1183838 https://bugzilla.redhat.com/attachment.cgi?id=986213
# 1172766 https://bugzilla.redhat.com/attachment.cgi?id=989450 I hope it 
helps you a bit.

-- 
Petr Hracek
Software Engineer
Developer Experience
Red Hat, Inc
Mob: +420777056169
email: phracek <at> redhat.com

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