[Insight-developers] vxl update

[Tom Vercauteren]

On Wed, Dec 8, 2010 at 19:59, Matthew McCormick (thewtex)
<matt at mmmccormick.com> wrote:
> It looks like the version of gcc4 installed was built without C++
> support -- there is no g++4 and there is no libstdc++.
>
> I suppose I could try building a custom g++ with a static libstdc++
> and use the 'Vanilla' Condor universe, but I will just try to stick to
> the versions of ITK that work with g++-3.4 for now.
>
> I do agree that shifting optimizations away from gcc-3 to gcc-4 would
> be good in general.  Eventually breaking gcc-3 support may be fine.
> Maybe gcc-3.4 is a different story than gcc-3.3.

My experience has indeed been that gcc-3.4 was a major improvement
with respect to gcc-3.3. I suggest we try to support gcc-3.4 for now.
There are no errors on gcc-3.4 for now right? I have no feelings about
gcc-3.3.

On the other hand, I don't see any good reason to keep optimizations
that only works for gcc-3.x. Let's try to target a decent performance
on recent compilers only and simply ensure that the code works on
older ones.

My two cents,
Tom

>  For now, thanks to
> Brad K. for trying to keep the vxl support going.
>
> Regards,
> Matt
>
> On Wed, Dec 8, 2010 at 12:04 PM, Matthew McCormick (thewtex)
> <matt at mmmccormick.com> wrote:
>> Cool.  Thanks.
>>
>> On Wed, Dec 8, 2010 at 12:02 PM, Hans Johnson <hans-johnson at uiowa.edu> wrote:
>>> Here are the flags that we use for performance:
>>>
>>>
>>> set ( CMAKE_CXX_FLAGS_RELEASE "-DNDEBUG -O3 -msse -mmmx -msse2 -m64 -Wall -W
>>> -Wshadow -Wcast-qual -Wwrite-strings" CACHE STRING "" )
>>>
>>>
>>> CC=gcc4 CXX=g++4 ccmake ../ITK
>>>
>>> Hans
>>>
>>> --
>>> Hans J. Johnson, Ph.D.
>>> Hans-johnson at uiowa.edu
>>>
>>> 278 GH
>>> The University of Iowa
>>> Iowa City, IA 52241
>>> (319) 353 8587
>>>
>>>
>>>> From: "Matthew McCormick (thewtex)" <matt at mmmccormick.com>
>>>> Reply-To: "Matthew McCormick (thewtex)" <matt at mmmccormick.com>
>>>> Date: Wed, 8 Dec 2010 11:50:32 -0600
>>>> To: Hans Johnson <hans-johnson at uiowa.edu>
>>>> Cc: Bill Lorensen <bill.lorensen at gmail.com>, ITK <insight-developers at itk.org>
>>>> Subject: Re: [Insight-developers] vxl update
>>>>
>>>> Hi Hans,
>>>>
>>>> Here is what I get,
>>>>
>>>> mmmccormick at mpded ~$ gcc --version
>>>> gcc (GCC) 3.4.6 20060404 (Red Hat 3.4.6-8)
>>>>
>>>> mmmccormick at mpded ~$ gcc4 --version
>>>> gcc4 (GCC) 4.1.0 20060515 (Red Hat 4.1.0-18)
>>>>
>>>> I will try to see if I can use gcc4 over the next week, and we will
>>>> see how it goes.
>>>>
>>>> Thanks,
>>>> Matt
>>>>
>>>>
>>>> On Wed, Dec 8, 2010 at 10:37 AM, Hans Johnson <hans-johnson at uiowa.edu> wrote:
>>>>> Matthew,
>>>>>
>>>>> It is the default, but is gcc4 already installed?  I'm almost certain that
>>>>> RedHat EL4 defaults to gcc3, but gcc4 is usually installed, or is easy to
>>>>> install.
>>>>>
>>>>> Perhaps you are going to prove my hypothesis incorrect.
>>>>>
>>>>> PS:  I've found significant performance improvements when using gcc4.  If
>>>>> performance is an issue, I'd recommend you use gcc4 in release mode.  There
>>>>> are some compiler options that really help with performance that are only
>>>>> available in gcc4.
>>>>>
>>>>>
>>>>> Hans
>>>>> --
>>>>> Hans J. Johnson, Ph.D.
>>>>> Hans-johnson at uiowa.edu
>>>>>
>>>>> 278 GH
>>>>> The University of Iowa
>>>>> Iowa City, IA 52241
>>>>> (319) 353 8587
>>>>>
>>>>>
>>>>>> From: "Matthew McCormick (thewtex)" <matt at mmmccormick.com>
>>>>>> Reply-To: "Matthew McCormick (thewtex)" <matt at mmmccormick.com>
>>>>>> Date: Wed, 8 Dec 2010 09:38:48 -0600
>>>>>> To: Bill Lorensen <bill.lorensen at gmail.com>
>>>>>> Cc: Hans Johnson <hans-johnson at uiowa.edu>, ITK <insight-developers at itk.org>
>>>>>> Subject: Re: [Insight-developers] vxl update
>>>>>>
>>>>>> On Wed, Dec 8, 2010 at 9:08 AM, Bill Lorensen <bill.lorensen at gmail.com>
>>>>>> wrote:
>>>>>>> I don't think we should drop gcc 3.x. For example, my mingw gcc
>>>>>>> compiler is 3.4.5 and builds ITK just fine. It is a recent download of
>>>>>>> mingw.
>>>>>>>
>>>>>>> I'm sure there are a lot of folks out there still using gcc 3.x
>>>>>>>
>>>>>>
>>>>>> It is default for the Condor cluster I use.
>>>>>
>>>>>
>>>
>>>
>>
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