Currently we ship shiboken as part of the PySide2 package.
This inflates the wheel size by quite a bit.
For instance on macOS:
shiboken size - 4MB
libclang.dylib size - 64MB (51MB on Windows) 
The report sizes are for libclang 6.0. For 4.0 on Windows the size is ~22MB.
We would save a bit of space in the wheel if we would ship shiboken as a separate package.
An additional step would be linking against a static version of libclang, thus reducing the size further.
- relates to
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        PYSIDE-749
        Modularize / decouple the shiboken / PySide2 build process
    
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 - Closed
 
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PYSIDE-661 Reduce bloated wheel sizes
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 - Closed
 
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- resulted in
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PYSIDE-879 shiboken2.exe generator is absent
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     - Closed
 
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