Linker Tools Error LNK1306

DLL entry point function cannot be managed; compile to native

DllMain cannot be compiled to MSIL; it must be compiled to native.

To resolve this issue,

• Compile the file that contains the entry point without /clr.

• Put the entry point in a #pragma unmanaged section.

For more information, see:

• /clr (Common Language Runtime Compilation)

• managed, unmanaged

• Initialization of Mixed Assemblies

• DLLs and Visual C++ run-time library behavior

Example

The following sample generates LNK1306.

// LNK1306.cpp
// compile with: /clr /link /dll /entry:NewDllMain
// LNK1306 error expected
#include <windows.h>
int __stdcall NewDllMain( HINSTANCE h, ULONG ulReason, PVOID pvReserved ) {
   return 1;
}

To fix this issue, do not use the /clr option to compile this file, or use a #pragma directive to put the entry point definition in an unmanaged section as shown in this example:

// LNK1306fix.cpp
// compile with: /clr /link /dll /entry:NewDllMain
#include <windows.h>
#pragma managed(push, off)
int __stdcall NewDllMain( HINSTANCE h, ULONG ulReason, PVOID pvReserved ) {
   return 1;
}
#pragma managed(pop)