Build fix to build OpenEXR_Viewers

[mikaelsundell]

Couldn't build the OpenEXR_Viewers 2.2 release with OpenEXR 2.2. Changed a few things in the cmake setup to get it running, guess I'm missing something here.

[meshula]

It might be a good idea for the OpenEXR project to publish some generic FindIlmBase and FindOpenEXR CMake scripts. CTL is broken (and you've supplied a PR for it). Alembic is broken too, I suspect across the board, there's more broken than not. An alternative to new CMake scripts would be to symlink the files back to the old names during the EXR build, but I suspect there was debate and the conclusion was to suffix versions to names to avoid version conflicts?

[mikaelsundell]

I agree - everyone is doing their own cmake scripts for IlmBase and OpenEXR right now. Would be nice with an official version that supports different versions. OIIO does a good job:
https://github.com/OpenImageIO/oiio/blob/master/src/cmake/modules/FindIlmBase.cmake

It basically regex out the version numbers from OpenEXRConfig.h and and IlmBaseConfig.h and then formats to get the right syntax for the version suffix of the libraries.

I just sent an email to the Alembic list on the same subject:
https://groups.google.com/forum/#!topic/alembic-discussion/WrK6dTOfFj8

This one is even more simple, the -2_2 suffix is added in the bootstrap after the IlmMath library is given a s a parameter.

So - yes 2 official cmake scripts to find OpenEXR and IlmBase would be perfect :-)

[meshula]

I think this need was met by ecfcac7

Thanks