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Shared or Static library? #40

Description

@szymonj99

Currently, OneLibrary only supports being built as a static library.
In order to provide support for building and using a shared library (.dll etc.) we need to call:
Windows ->

#ifdef __cplusplus
extern "C" {
#endif

__declspec(dllexport) void myfunction();

#ifdef __cplusplus
}
#endif

Unix ->
Create a file *.ld:

EXPORTS
{
    myfunction;
};

Set CMake:

set_target_properties(MyLibrary PROPERTIES LINK_FLAGS "-Wl,-T,${CMAKE_SOURCE_DIR}/mylibrary.ld")

Add export-equivalent function declaration in .cpp (or .h?)

void __attribute__((visibility("default"))) myfunction();

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