[CMake] How to create libfoo.so.1 style names for OS X shared libraries

[Blair Zajac]

We have an existing deployment of a large amount of internal software on 
Linux using custom build and link tools that expect a certain naming 
layout.  We're porting it over to OS X and to be consistent we want to 
name shared libraries with the Linux style, that is, libOpenImageIO.so.32.

OpenImageIO uses CMake and it works great on Linux in creating 
libOpenImageIO.so.32 but on Mac OS X it is creating libOpenImageIO.32.so 
instead.  I'm setting SUFFIX to .so to create .so instead of .dylib:

     set_target_properties(OpenImageIO PROPERTIES SUFFIX .so)

But am unable to get CMake to switch the .so and SOVERSION order.

$ find -name lib\* \! -type d
./build/macosx/libOpenImageIO/libOpenImageIO.1.2.0.so
./build/macosx/libOpenImageIO/libOpenImageIO.32.so
./build/macosx/libOpenImageIO/libOpenImageIO.so
./dist/macosx/lib/libOpenImageIO.1.2.0.so
./dist/macosx/lib/libOpenImageIO.32.so
./dist/macosx/lib/libOpenImageIO.so


Trying to use OUTPUT_NAME doesn't work.  This code:

     set_target_properties(OpenImageIO
                           PROPERTIES
                           OUTPUT_NAME libOpenImageIO.so.${SOVERSION})

creates build/macosx/libOpenImageIO/liblibOpenImageIO.so.32.1.2.0.so, 
suggests that OUTPUT_NAME is only for the base part of the shared 
library and CMake will always reverse the order of SUFFIX and VERSION.

Any suggestions?

There's a stack overflow question for this at [2].

Thanks,
Blair

[1] https://sites.google.com/site/openimageio/
[2] http://stackoverflow.com/q/14902773/80731