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    <p>The method I used was to export a function called GetLogger from the EXE which provides a pointer to the singleton. GetInstance() implementation is conditional on the _USRDLL preprocessor define. When _USRDLL is set (for the DLL compilation) GetInstance() calls GetModuleHandle() to get a handle to the EXE and loads the function called GetLogger. Here's the code based on your example:</p> <p>Static lib has Log.h:</p> <pre><code>class Log { private: Log(); public: ~Log(); static Log&amp; GetInstance() { #ifdef _USRDLL typedef Log* (*GetLoggerFn)(); HMODULE mod = GetModuleHandle( NULL ); GetLoggerFn getLogger = (GetLoggerFn)::GetProcAddress( mod, "GetLogger" ); Log* Instance = getLogger(); return *Instance; #else static Log Instance; return Instance; #endif } void Write(const std::string&amp; str ); }; #define LOG Log::GetInstance() </code></pre> <p>Static lib has Log.cpp:</p> <pre><code>#include "Log.h" void Log::Write(const std::string&amp; str ) { std::cout &lt;&lt; this &lt;&lt; " " &lt;&lt; str &lt;&lt; std::endl; } Log::Log() { } Log::~Log() { std::cout &lt;&lt; "Log destroyed" &lt;&lt; std::endl; } </code></pre> <p>DLL just has a log statement in DllMain:</p> <pre><code>#include "../static/Log.h" BOOL APIENTRY DllMain( HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved ) { switch (ul_reason_for_call) { case DLL_PROCESS_ATTACH: case DLL_THREAD_ATTACH: case DLL_THREAD_DETACH: case DLL_PROCESS_DETACH: break; } LOG.Write("Hello from dll"); return TRUE; } </code></pre> <p>And EXE looks like this:</p> <pre><code>#include "stdafx.h" #include "../static/Log.h" #include &lt;Windows.h&gt; extern "C" { __declspec( dllexport ) Log* GetLogger() { return &amp;LOG; } } int _tmain(int argc, _TCHAR* argv[]) { LOG.Write("Hello from exe"); HMODULE mod = ::LoadLibraryA( "../Debug/tdll.dll"); ::FreeLibrary( mod ); LOG.Write("unloaded library"); return 0; } </code></pre>
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