[ITK-dev] Ubuntu 14 Test failure bisect results

[Matt McCormick]

Hi Brad,

Thanks for investigating and getting great information out of git bisect.

I developed the patch on Gentoo with GCC 4.8.4 / binutils 2.24, and I
have not seen any issues.  The eldorado builds on the dashboard are
all Ubuntu 14.04.2, too.  I will start an Experimental build with
BUILD_SHARED_LIBS set on eldorado to be sure it can be reproduced.

Thanks,
Matt

On Fri, Jul 31, 2015 at 1:03 PM, Bradley Lowekamp
<blowekamp at mail.nih.gov> wrote:
> Matt,
>
> I was digging into these test failures:
>
> https://open.cdash.org/viewTest.php?onlyfailed&buildid=3932451
>
> Here are the results of the git bisect:
>
> 674acdb2dd5546b7045f7253c84e4f9f237405e8 is the first bad commit
> commit 674acdb2dd5546b7045f7253c84e4f9f237405e8
> Author: Matt McCormick <matt.mccormick at kitware.com>
> Date:   Sun May 31 21:00:55 2015 -0400
>
>     ENH: Use gold linker on Linux with GCC.
>
>
>
>     The gold linker is approximately three times as fast as the default
> linker.
>     Enable it with GCC 4.8 and newer where it was tested. The gold linker
> only
>     works with ELF executables, so it is only enabled for Linux.
>
>
>
>     Timing tests:
>
>
>
>     Static libs link time:
>
>
>
>       ld:      452 sec
>       ld-gold: 179 sec
>
>
>
>     Shared libs link time, wrapping enabled:
>
>
>
>       ld:      164 sec
>       ld-gold: 48 sec
>
>
>
>     Change-Id: Ic8d9b5132ad6b71e5f100b5436615d6a8fac3e5c
>
> Disabling ld-gold seems to fix the problem.
>
> Versions:
>
> blowekamp at lhcp-vm-ubu14:~/ITK$ gcc --version
> gcc (Ubuntu 4.8.4-2ubuntu1~14.04) 4.8.4
> Copyright (C) 2013 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions.  There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
> blowekamp at lhcp-vm-ubu14:~/ITK$ ld --version
> GNU ld (GNU Binutils for Ubuntu) 2.24
> Copyright 2013 Free Software Foundation, Inc.
> This program is free software; you may redistribute it under the terms of
> the GNU General Public License version 3 or (at your option) a later
> version.
> This program has absolutely no warranty.
>
> blowekamp at lhcp-vm-ubu14:~/ITK$ lsb_release -a
> No LSB modules are available.
> Distributor ID: Ubuntu
> Description: Ubuntu 14.04.2 LTS
> Release: 14.04
> Codename: trusty
>
>
> Currently we have a check for using gold with > 4.8.3:
> https://github.com/InsightSoftwareConsortium/ITK/blob/master/CMake/ITKSetStandardCompilerFlags.cmake#L206
>
> But looking at this change:
> https://github.com/InsightSoftwareConsortium/ITK/commit/102c79bd3bb50cc649f2733c472bdfaa138c453e
>
> We should have know about these related test failures:
> https://github.com/InsightSoftwareConsortium/ITK/commit/102c79bd3bb50cc649f2733c472bdfaa138c453e
>
> So what do you recall about what versions of GCC ld-gold works on?
>
> Thanks,
> Brad
>
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