cannot export whole class

[TVMAN]

sorry my poor english. there are 3 bugs(questions):

1.
------------------------------------------------
export class CMyClass
{
public:
...
}
------------------------------------------------
this will not export any method in DLL.


2.
can dmd generate a "pure" header file? that is, no any code in generated .di
file.
----------------------
void test()
{
  int a = 0;
}
----------------------
this function will not changed in .di file

----------------------
void test()
{
  if ( .. )..;
  int a = 0;
}
----------------------
this function will become

void test();

this is right

3.
"dmd -release -O ..." works not fine, when compile dwt's ole_com example,
some useful code be "optimized out". code in oleclientsite.d:
protected GUID* getClassID(char[] clientName) {
	// create a GUID struct to hold the result
	GUID* guid = new GUID();

	// create a null terminated array of wchar
	wchar* buffer = null;
	if (clientName !is null) {
		buffer = Converter.StrToWCHARz(clientName);
	}
	if (COM.CLSIDFromProgID(buffer, guid) != COM.S_OK){
		HRESULT result = COM.CLSIDFromString(buffer, guid);
		if (result != COM.S_OK)
			OLE.error(__FILE__, __LINE__,
OLE.ERROR_INVALID_CLASSID, result);
	}
	return guid;
}

-------------------------------------
	if (clientName !is null) {
		buffer = Converter.StrToWCHARz(clientName);
	}
---------------------------------------
this have optimizition error

but
-------------------------------------
	if (clientName != null) {
		buffer = Converter.StrToWCHARz(clientName);
	}
---------------------------------------
have not optimizition error