tinycc/win32/examples/dll.c

//+---------------------------------------------------------------------------
//
//  dll.c - Windows DLL example - dynamically linked part
//

#include <windows.h>
#define DLL_EXPORT __declspec(dllexport)

DLL_EXPORT void HelloWorld (void)
{
    MessageBox (0, "Hello World!", "From DLL", MB_ICONINFORMATION);
}