• =?iso-8859-1?Q?Robert_M=2E_M=FCnch?= <robert.muench robertmuench.de> Aug 28 2005
• "Walter" <newshound digitalmars.com> Aug 30 2005
• =?iso-8859-1?Q?Robert_M=2E_M=FCnch?= <robert.muench robertmuench.de> Sep 02 2005
• =?iso-8859-1?Q?Robert_M=2E_M=FCnch?= <robert.muench robertmuench.de> Sep 02 2005
• "Walter" <newshound digitalmars.com> Sep 02 2005

Hi, I'm trying to comile some C++ code and have some problems with the  
so loved "symbol undefined" errors. I have this class:

File: mk4.h
/// Used to get or set double precision values.
class c4_DoubleRef : public c4_Reference
{
public:
       /// Constructor
   c4_DoubleRef (const c4_Reference&);
       /// Get the value as floating point
   operator double () const;
       /// Set the value to the specified floating point
   c4_DoubleRef& operator= (double);
};

File: mk4.inl
/////////////////////////////////////////////////////////////////////////////
// c4_DoubleRef

d4_inline c4_DoubleRef::c4_DoubleRef (const c4_Reference& value_)
     : c4_Reference (value_)
{
}

File: viewx.cpp
c4_DoubleRef::operator double () const
{
   c4_Bytes result;
   if (!GetData(result))
     return 0;

   d4_assert(result.Size() == sizeof (double));
   return *(const double*) result.Contents();
}

c4_DoubleRef& c4_DoubleRef::operator= (double value_)
{
   SetData(c4_Bytes (&value_, sizeof value_));
   return *this;
}

And I get this error, when compiling some other code using the library  
where the above code belongs to:

mkstorage.obj(mkstorage)
  Error 42: Symbol Undefined ??Bc4_DoubleRef  QBENXZ (operator double  
syscall c4_DoubleRef::(void )const )
mkstorage.obj(mkstorage)
  Error 42: Symbol Undefined ??4c4_DoubleRef  QAEAAV0 N Z (c4_DoubleRef  
&syscall c4_DoubleRef::=(double ))
OPTLINK : Warning 134: No Start Address

--- errorlevel 2

Any idea why those two unknown symbols show up? Somehow a reference to  
the shown signatures must be compiled but I have no idea where this  
happens. Could it be some implicit conversions? Any hint welcome.

-- 
Robert M. Münch
Management & IT Freelancer
http://www.robertmuench.de

I'd check to see that veiwx.obj is being linked in.

On Wed, 31 Aug 2005 06:35:04 +0200, Walter <newshound digitalmars.com>  
wrote:

 I'd check to see that veiwx.obj is being linked in.


Ok, thanks. I checked to see if viewx.obj contains the functions at  
all. This is what "libunres -p viewx.obj" gives. (BTW: I didn't  
remember about libunres.exe)

...
??Bc4_BytesRef  QBE?AVc4_Bytes  XZ
??Bc4_IntRef  QBEJXZ
??Bc4_StringRef  QBAPBDXZ
??Bc4_ViewRef  QBE?AVc4_View  XZ
...

So, it seems, it's already not included in the viewx.obj file. How can  
this happen?

-- 
Robert M. Münch
Management & IT Freelancer
http://www.robertmuench.de

On Wed, 31 Aug 2005 06:35:04 +0200, Walter <newshound digitalmars.com>  
wrote:

 I'd check to see that veiwx.obj is being linked in.


Ok, I got some more information, the problem is that:

_M_I86SM, M_I86SM
	Small memory model. Defined for -ms, -mx, -mp, -mf or -mn.

I'm using this line to compile my DLL:
	CFLAGS = -WD -mn -Ae -Ab -Dq4_WIN32 -Dq4_UNIV -Dq4_BOOL -Dq4_INLINE  
-Dq4_KITDLL -D_USRDLL

and this sets _M_I86SM. Is this correct? I thought Win32 always has a  
large (flat) memory model. I changed the #if part and now it works.

-- 
Robert M. Münch
Management & IT Freelancer
http://www.robertmuench.de

"Robert M. Münch" <robert.muench robertmuench.de> wrote in message
news:op.swg1irql3b5602 news.digitalmars.com...
 On Wed, 31 Aug 2005 06:35:04 +0200, Walter <newshound digitalmars.com>
 wrote:

 I'd check to see that veiwx.obj is being linked in.


 Ok, I got some more information, the problem is that:

 _M_I86SM, M_I86SM
 Small memory model. Defined for -ms, -mx, -mp, -mf or -mn.

 I'm using this line to compile my DLL:
 CFLAGS = -WD -mn -Ae -Ab -Dq4_WIN32 -Dq4_UNIV -Dq4_BOOL -Dq4_INLINE
 -Dq4_KITDLL -D_USRDLL

 and this sets _M_I86SM. Is this correct? I thought Win32 always has a
 large (flat) memory model.


True, but it is technically a "small" memory model.

 I changed the #if part and now it works.


I'm glad you got it working now.