[Insight-developers] GDCM empty cxx files

Mark Roden mmroden at gmail.com
Sat Mar 26 17:57:31 EDT 2011 

Hi Alex,

The reality is, the tests just aren't there in ITK proper.  Fixing the
warnings in ITK as they stand now will cause tests in GDCM proper to
fail, which means that many files can't be read.  Bill's most recent
submission, for instance, will cause two GDCM tests to fail, but won't
cause any ITK tests to fail, since the test coverage just isn't there.
 Couple that with the lack of response I got for my submissions in
ITK, and it's just faster for me to work in GDCM proper, fix the
warnings there with as much test coverage as I can get (and getting
those tests solved is no mean feat, especially since they're exposing
some interesting corner cases), and then port to ITK knowing that the
tests are working.

The breaking test in ITK, the one that's not been working for many
months now, is just not a correct test.  The test itself was made a
test using a broken, invalid DICOM test, and then breaks because GDCM
refuses to read the broken image, which is the proper behavior as
specified in the DICOM specification.  The test still hasn't been
fixed after both Mathieu and I have repeatedly pointed out that it's a
broken test, and attempts to fix it have been ignored.

So, I believe that working in GDCM proper is the right thing to do to
fix these warnings in some kind of timely manner.  The ITK development
process has just been too slow, and I want to ensure that
functionality isn't broken in ITK that works in GDCM proper due to
attempts to fix warnings quickly.  I would also love it if the GDCM
tests and testing library could be included in ITK's test suite, but I
don't know how that would work.

Mark

On Sat, Mar 26, 2011 at 12:41 AM, Alexandre GOUAILLARD
<agouaillard at gmail.com> wrote:
> mark,
>
> as indicated many times,
> our duty goes to ITK and not to gdcm proper.
> The priority is to fix the warning on the itk dashboard first.
> Brad king mentionned you could modify in ITK and backport to gdcm later.
> I explained to you how you could also have a separate git rep. to be
> the buffer between gdcm and itk if need be.
>
> now, our duty goes to ITK. The priority is to make the ITK dashboard green
>
> alex.
>
>
> On Sat, Mar 26, 2011 at 6:14 AM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>> Whatever is the best approach to fix the gdcm warnings. They are the major
>> source of warnings are really getting annoying. They have been present since
>> last summer.  I will continue to fix gdcm warnings until I see them dropping
>> through another means.
>>
>> On Fri, Mar 25, 2011 at 6:10 PM, Mark Roden <mmroden at gmail.com> wrote:
>>>
>>> Ah, thanks for that.
>>>
>>> Since it took so long for my last gerrit patch to get a review, I've
>>> switched to fixing tests and warnings in the gdcm main branch.  My
>>> hope was to be able to drop that chunk of code into ITK, with the
>>> warnings fixed there.  Many of them have already been fixed in ITK,
>>> but moving over fixes from ITK to gdcm main produced some failing gdcm
>>> tests.  These tests don't exist in ITK (hence removing the GDCM build
>>> option from the ITK cmake options), and the ITK gdcm tests appear to
>>> be building and running just fine (with the exception of IO test 5,
>>> and that looks to be the same broken test it's always been, and should
>>> be removed from the test suite).
>>>
>>> Is this approach a valid one?  I mean, it's taken around 2 weeks for
>>> someone to review an ITK gerrit patch from me, but in the meantime,
>>> I've been able to make much faster progress in the gdcm main branch
>>> with this approach.  And, I think, a safer one, since there is more
>>> complete test coverage.
>>>
>>> Mark
>>>
>>> On Fri, Mar 25, 2011 at 3:05 PM, Bill Lorensen <bill.lorensen at gmail.com>
>>> wrote:
>>> > I have the fix in my gerrit patch.
>>> >
>>> > On Fri, Mar 25, 2011 at 3:33 PM, Mark Roden <mmroden at gmail.com> wrote:
>>> >>
>>> >> I thought I submitted a patch for this as well, but it probably didn't
>>> >> make it over the ITK modularization boundary.
>>> >>
>>> >> The last patch I submitted was done after the ITK changeover, but I
>>> >> guess the changeover was ongoing when I submitted the patch, and so
>>> >> now I have to redo it.  That's the
>>> >> getting-rid-of-superfluous-cmake-options patch.
>>> >>
>>> >> On Fri, Mar 25, 2011 at 12:21 PM, Ryan, William J.
>>> >> <ryan.william at mayo.edu> wrote:
>>> >> > I think Mark Roden had a patch submitted that may fix this, but I'm
>>> >> > not
>>> >> > 100%
>>> >> > sure about that.  Let's see what he has to say.
>>> >> >
>>> >> >
>>> >> >
>>> >> >
>>> >> >
>>> >> >   Bill Ryan
>>> >> >
>>> >> >
>>> >> >
>>> >> > From: insight-developers-bounces at itk.org
>>> >> > [mailto:insight-developers-bounces at itk.org] On Behalf Of Bill
>>> >> > Lorensen
>>> >> > Sent: Friday, March 25, 2011 1:23 PM
>>> >> > To: Mathieu Malaterre
>>> >> > Cc: Insight Developers
>>> >> > Subject: Re: [Insight-developers] GDCM empty cxx files
>>> >> >
>>> >> >
>>> >> >
>>> >> > Mathieu,
>>> >> >
>>> >> > We still support VS7.1. I would like to submit a patch that removes
>>> >> > these
>>> >> > files from the lib and see if it works.
>>> >> >
>>> >> > Unfortunately, the VS generator does not work with the modularized
>>> >> > ITK.
>>> >> > We
>>> >> > may not be able to thoroughly test it until the patched cmake is
>>> >> > released.
>>> >> >
>>> >> > Thanks,
>>> >> >
>>> >> > Bill
>>> >> >
>>> >> > On Fri, Mar 25, 2011 at 2:13 PM, Mathieu Malaterre
>>> >> > <mathieu.malaterre at gmail.com> wrote:
>>> >> >
>>> >> > From the top of my head, this was V7.1 with /MT as compilation flag
>>> >> > (instead of the default /MD used by Cmake). Can't remember if this
>>> >> > was
>>> >> > using shared or static lib.
>>> >> >
>>> >> > Does anyone still have this compiler ?
>>> >> >
>>> >> > HTH
>>> >> >
>>> >> > On Fri, Mar 25, 2011 at 7:06 PM, Bill Lorensen
>>> >> > <bill.lorensen at gmail.com>
>>> >> > wrote:
>>> >> >> Mathieu,
>>> >> >>
>>> >> >> Several files including gdcmObject.cxx have no code in them. Your
>>> >> >> comment
>>> >> >> in
>>> >> >> gdcmObject.cxx says:
>>> >> >>   // Don't ask why, but this is EXTREMELY important on Win32
>>> >> >>   // Apparently the compiler is doing something special the first
>>> >> >> time
>>> >> >> it
>>> >> >> compiles
>>> >> >>   // this instanciation unit
>>> >> >>   // If this fake file is not present I get an unresolved symbol for
>>> >> >> each
>>> >> >> function
>>> >> >>   // of the gdcm::Object class
>>> >> >>
>>> >> >> When linking these "empty" files, VS10 reports several warnings:
>>> >> >>  warning LNK4221: This object file does not define any previously
>>> >> >> undefined
>>> >> >> public symbols, so it will not be used by any link operation that
>>> >> >> consumes
>>> >> >> this library
>>> >> >>
>>> >> >> I have removed this file from the lib as well as
>>> >> >> gdcmProgressEvent.cxx, gdcmString.cxx, gdcmException.cxx
>>> >> >> gdcmDeflateStream.cxx and gdcmByteSwap.cxx
>>> >> >>
>>> >> >> When I build the modified lib, I do not get the warnoings, nor do I
>>> >> >> get
>>> >> >> any
>>> >> >> errors.
>>> >> >>
>>> >> >> What compiler was giving the errors you mention in the comments?
>>> >> >>
>>> >> >> Bill
>>> >> >>
>>> >> >
>>> >> >
>>> >> > --
>>> >> > Mathieu
>>> >> >
>>> >> >
>>> >
>>> >
>>
>>
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