bug#20614: Segmentation fault when building on Power8 Little Endian

[Petr Hracek]

On 09/26/2015 09:58 AM, Eli Zaretskii wrote:

Cc: 20614@debbugs.gnu.org
From: Petr Hracek <phracek@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@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@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@redhat.com