[ITK-dev] Ubuntu 14 Test failure bisect results

[Bradley Lowekamp]

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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