unresolved externals with mixed mode DLL

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Stephen Ahn - 30 Jul 2003 05:41 GMT

Using : VS.NET 2003,

I'm attempting to create a mixed-mode C++ DLL (i.e. has both managed and
unmanaged code). When attempting to reference globals _timezone and
_daylight,
I get the following error at link time :

LINK : error LNK2020: unresolved token (0A000023) _timezone
LINK : error LNK2020: unresolved token (0A000024) _daylight
LINK : fatal error LNK1120: 2 unresolved externals

My link options look like this (remember, this is mixed mode) :

/INCREMENTAL /NOLOGO /LIBPATH:".\lib" /DLL
/NODEFAULTLIB:"LIBCMT.LIB" /NODEFAULTLIB:"LIBCMTD.lib"
/NODEFAULTLIB:"nochkclr.obj" /INCLUDE:__DllMainCRTStartup@12
/SUBSYSTEM:WINDOWS /NOENTRY msvcrt.lib kernel32.lib user32.lib
gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib
oleaut32.lib uuid.lib odbc32.lib odbccp32.lib
[... my objs]

Any ideas why the linker can't find these variables ?

TIA,
Stephen

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Gautam Bhakar [MSFT] - 04 Aug 2003 18:56 GMT

The problem here that you are not really linking to libcmt.lib or
libcmtd.lib which have the definition for _timezone. Note that you are
using /nodefault:libcmt.lib which doesn't pick these libs by default and
thus you will need to explicitly specify them on linker commandline.

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--------------------

| From: "Stephen Ahn" <stevea@edi.com.au>
| Subject: unresolved externals with mixed mode DLL
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| Path: cpmsftngxa06.phx.gbl!TK2MSFTNGP08.phx.gbl!TK2MSFTNGP09.phx.gbl
| Xref: cpmsftngxa06.phx.gbl

microsoft.public.dotnet.languages.vc.libraries:2279

| X-Tomcat-NG: microsoft.public.dotnet.languages.vc.libraries
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| TIA,
| Stephen

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Stephen Ahn - 05 Aug 2003 03:28 GMT

If I link one of these libraries, then I get a linker warning such as :

LINK : warning LNK4098: defaultlib 'LIBCMTD' conflicts with use of other
libs;
use /NODEFAULTLIB:library

I guess this is conflicting with msvcrt.dll, which I have to use in mixed
mode, as per :
http://support.microsoft.com/?id=814472

Ideas ?

Thanks,
Stephen

> The problem here that you are not really linking to libcmt.lib or
> libcmtd.lib which have the definition for _timezone. Note that you are
[quoted text clipped - 42 lines]
> | TIA,
> | Stephen

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unresolved externals with mixed mode DLL

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