[Insight-developers] Cygwin cmake 2.6 issue

[Wes Turner]

Bill,
Brad asked me to take care of this, but I have been out since Monday after
having knee surgery.  I will be working from home the next few days and this
is something that is on my list to do.  Is there a hard deadline on this, or
is it something I can dabble at for a few days?

- Wes

On Wed, Jun 3, 2009 at 8:59 AM, Brad King <brad.king at kitware.com> wrote:

> Bill Lorensen wrote:
>
>> Brad,
>>
>> Also, I think the same thing may have happened to the mingw build.
>> http://www.cdash.org/CDash/viewBuildError.php?buildid=346391
>>
>
> It is actually a problem affecting the GNU toolchain on windows,
> not just cygwin specifically.
>
>  Did some change break this compatibility? Or is this a bugu that
>> needed to be corrected?
>>
>
> CMake 2.6 links to the dll's import library "libITKCommon.dll.a"
> instead of the dll "cygITKCommon.dll".  This is considered the
> proper way to link on Windows in general, and was a bug in 2.4.
> However, the linker works differently with the import library
> than with the dll in some subtle ways, which led to the problem.
>
> It was just lucky that 2.4's way worked for our case.  I would
> not be surprised if it would cause some subtle runtime bugs in
> similar cases.  The root cause is that we are trying to link
> a shared library to static libraries and then an executable
> to both that shared library and the same static libraries.
> Therefore the solution is to build everything shared or static
> but not both.
>
> -Brad
>



-- 
Wesley D. Turner, Ph.D.
Kitware, Inc.
R&D Engineer
28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x120
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