Unresolved symbols while linking

Question

Hello all,
I'm toying around with oo4o and I'm having a linking problem. I'm working in VS.NET 2003.
I added the directories for headers, excutables, libraries, etc. At first I had 9 unresolved symbol errors, but I got it down to 2 by remembering to link with oraclm32.lib (debug copy). Not sure why those 2 errors are still there. My test function is basically the first sample in the Help docs, something like this:
     OStartup();
     ODatabase odb("ora9", "username", "passwd");
     ODynaset odyn(odb, "select * from emp");
     double salary;
     while (!odyn.IsEOF())
     odyn.GetFieldValue("sal", &salary);
odyn.MoveNext();
     OShutdown();
The relevant parts of the buildlog. Once I added the additional command line option to link with oraclm32, everything resolved except references to OStartup and OShutdown. Seems odd. Any ideas?
Buildlog:
Searching libraries
Searching C:\oracle\ora92\oo4o\CPP\LIB\oraclm32.lib:
Found "__declspec(dllimport) public: virtual __thiscall ODatabase::~ODatabase(void)" (__imp_??1ODatabase@@UAE@XZ)
Referenced in Dataconnect.obj
Loaded oraclm32.lib(ORACLM32.dll)
Found "__declspec(dllimport) public: virtual __thiscall ODynaset::~ODynaset(void)" (__imp_??1ODynaset@@UAE@XZ)
Referenced in Dataconnect.obj
Loaded oraclm32.lib(ORACLM32.dll)
Found "__declspec(dllimport) public: int __thiscall ODynaset::MoveNext(int)" (__imp_?MoveNext@ODynaset@@QAEHH@Z)
Referenced in Dataconnect.obj
Loaded oraclm32.lib(ORACLM32.dll)
Found "__declspec(dllimport) public: int __thiscall ODynaset::GetFieldValue(char const *,double *)const " (__imp_?GetFieldValue@ODynaset@@QBEHPBDPAN@Z)
Referenced in Dataconnect.obj
Loaded oraclm32.lib(ORACLM32.dll)
Found "__declspec(dllimport) public: int __thiscall ODynaset::IsEOF(void)const " (__imp_?IsEOF@ODynaset@@QBEHXZ)
Referenced in Dataconnect.obj
Loaded oraclm32.lib(ORACLM32.dll)
Found "__declspec(dllimport) public: __thiscall ODynaset::ODynaset(class ODatabase const &,char const *,long,class OSnapshotID *)" (__imp_??0ODynaset@@QAE@ABVODatabase@@PBDJPAVOSnapshotID@@@Z)
Referenced in Dataconnect.obj
Loaded oraclm32.lib(ORACLM32.dll)
Found "__declspec(dllimport) public: __thiscall ODatabase::ODatabase(char const *,char const *,char const *,long)" (__imp_??0ODatabase@@QAE@PBD00J@Z)
Referenced in Dataconnect.obj
Loaded oraclm32.lib(ORACLM32.dll)
SNIP
Dataconnect.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) void __fastcall OShutdown(void)" (__imp_?OShutdown@@YIXXZ) referenced in function "long __fastcall PostData(char *)" (?PostData@@YIJPAD@Z)
Dataconnect.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) int __fastcall OStartup(int)" (__imp_?OStartup@@YIHH@Z) referenced in function "long __fastcall PostData(char *)" (?PostData@@YIJPAD@Z)

Answer 1

Hi Guys,
I got this error too recently. Was troubling me a lot. I was using Windows 7 OS, Visual Studio 2010 compiler.
The fix for this is pretty much straight forward and solution lies in the Project settings only.
To my knowledge, with /MDd switch, it causes the compiler to place the library name MSVCRTD.lib into the .obj file.
But with /MTd switch, This option just causes the compiler to place the library name LIBCMTD.lib into the .obj file so that the linker will use LIBCMTD.lib to resolve external symbols. For details, please refer to this MSDN article:
https://msdn.microsoft.com/en-us/library/2kzt1wy3(VS.71).aspx
Its very useful.
Also
MDd stands for Multi-threaded Debug DLL
MTd stands for Multi-threaded Debug
Thanks,
Kiran