[ITK] [ITK-dev] Workaround for dynamic_cast on Mac OSX

[Matt McCormick]

Here are the tests:

  http://review.source.kitware.com/#/c/21755/

where reasonable export specification is added in both ITK and the
client libraries. But, dynamic_cast fails on OSX:

  https://open.cdash.org/testDetails.php?test=499059765&build=4637669


Matt

On Thu, Nov 10, 2016 at 3:21 PM, Johnson, Hans J <hans-johnson at uiowa.edu> wrote:
> I agree with Marcus.  At least until it is very clear that not using dynamic_cast is the only solution to a broken compiler, I am very weary of “doing what works today”.
>
> Hans
>
>
> --
>
>
> On 11/10/16, 1:11 PM, "Insight-developers on behalf of Marcus D. Hanwell" <insight-developers-bounces at itk.org on behalf of marcus.hanwell at kitware.com> wrote:
>
>     On Tue, Nov 8, 2016 at 5:01 PM, Matt McCormick
>     <matt.mccormick at kitware.com> wrote:
>     > Hi folks,
>     >
>     > As we have wrestled with in Slicer, along with other applications
>     > where ITK is used in multiple shared libraries, dynamic_cast can fail
>     > on Mac OSX.
>     >
>     > I summarized the cause of the problem and steps for the proposed solution here:
>     >
>     >   https://issues.itk.org/jira/browse/ITK-3490
>     >
>     > Feedback is welcome. The effort is targeted for the ITK 4.11.0 release.
>     >
>     From the issue it is not clear to me why you can't fix the symbol
>     visibility issues, or which of these cases it causing the breakage.
>     Reading the linked blog post it seems like Apple/Clang is doing the
>     right thing, and C++ libraries must be careful to use consistent
>     symbol visibility.
>
>     I would be interested in further details on which case or cases are
>     causing dynamic_cast to fail, and why using consistent symbol
>     visibility in the interfaces is not feasible/possible.
>
>     Thanks,
>
>     Marcus
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