Add shared library support when building with meson

[Colum31]

Description

Building shared libraries is currently not supported, when building with meson.
This PR enables building shared libraries, by passing -Ddefault_library=shared.
When this option is not passed, a static library is built.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.99%. Comparing base (fa43b77) to head (c8b394e).

Additional details and impacted files

@@           Coverage Diff           @@
##            devel    #2918   +/-   ##
=======================================
  Coverage   90.99%   90.99%           
=======================================
  Files         198      198           
  Lines        8597     8597           
=======================================
  Hits         7822     7822           
  Misses        775      775           

[horenmar]

Does this handle exporting symbols?

[Colum31]

Yes, when running readelf -s I can see exported symbols.

[Colum31]

Or which symbols do you mean?

[horenmar]

The important platform for this is Windows. Linux has all symbols visible by default, but Windows uses the better option, which is that all symbols are hidden by default.

CMake has WINDOWS_EXPORT_ALL_SYMBOLS for this.

[shahsb]

LGTM!

[stephanlachnit]

The important platform for this is Windows. Linux has all symbols visible by default, but Windows uses the better option, which is that all symbols are hidden by default.

CMake has WINDOWS_EXPORT_ALL_SYMBOLS for this.

There is the gnu_symbol_visibility property in Meson which can be used to hide all symbols on Unix by default.

However, this only works when each symbol has the appropriate symbol visibility annotation, which is not the case as far as I can see. There is also no equivalent for WINDOWS_EXPORT_ALL_SYMBOLS, so Windows compilation would be broken by default.