src/mdlldk/dllmain

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Using a custom DllMain() was necessary, as the "Dynamic-Link Library Best Practices" advises not to perform some tasks within a DllMain() function and NimMain() calls LoadLibrary(), which is not recommended.

Therefore, the custom DllMain() does not perform any tasks when the dll is loaded, but calls GC_fullCollect() and NimDestroyGlobals() when it is unloaded. For more information on when NimMain() is called, see the initnim module.

If you want to add a custom DllMain() to your needs, compile with -d:mdlldkNoDllMain.

References:

• https://learn.microsoft.com/en-us/windows/win32/dlls/dllmain
• https://learn.microsoft.com/en-us/windows/win32/dlls/dynamic-link-library-entry-point-function
• https://learn.microsoft.com/en-us/windows/win32/dlls/dynamic-link-library-best-practices