This PR fixes the build process for Windows to correctly use __declspec(dllexport) on building the library, but __declspec(dllimport) when using the library.
Besides, it sets the default visibility of symbols to "hidden" when building with GCC or Clang, reducing library size and enabling some more compiler optimizations (https://gcc.gnu.org/wiki/Visibility).
This PR fixes the build process for Windows to correctly use
__declspec(dllexport)on building the library, but__declspec(dllimport)when using the library. Besides, it sets the default visibility of symbols to "hidden" when building with GCC or Clang, reducing library size and enabling some more compiler optimizations (https://gcc.gnu.org/wiki/Visibility).