Question

I have the below code that links and runs fine in 32bit mode –

#include "safeint3.hpp"
typedef SafeInt<SIZE_T> SAFE_SIZE_T;
SAFE_SIZE_T sizeOfCache;
SAFE_SIZE_T _allocateAmt;

Where safeint3.hpp is current version that can be found on Codeplex SafeInt. For those who are unaware of it, safeint is a template class that makes working with different integer types and sizes “safe”. To quote channel 9 video on software – “it writes the code that you should”.

Which is my case. I have a class that is managing a large in-memory cache of objects (>6gb) and I am very concerned about making sure that I don’t have overflow/underflow issues on my pointers/sizes/other integer variables. In this use, it solves many problems.

My problem is coming when moving from 32bit dev mode to 64bit production mode. When I build the app in this mode, I’m getting the following linker warnings –

1>cachecontrol.obj : warning LNK4006: "bool __cdecl IntrinsicMultiplyUint64(unsigned __int64 const &,unsigned __int64 const &,unsigned __int64 *)" (?IntrinsicMultiplyUint64@@YA_NAEB_K0PEA_K@Z) already defined in ImageInRamCache.obj; second definition ignored
1>cachecontrol.obj : warning LNK4006: "bool __cdecl IntrinsicMultiplyInt64(__int64 const &,__int64 const &,__int64 *)" (?IntrinsicMultiplyInt64@@YA_NAEB_J0PEA_J@Z) already defined in ImageInRamCache.obj; second definition ignored

While I understand I can ignore the error, I would like either (a) prevent the warning from occurring or (b) make it disappear so that my QA department doesn’t flag it as a problem. And after spending some time researching it, I cannot find a way to do either.

Answer 1

The problem is that inside safeint3.hpp, the code looks like this:

bool IntrinsicMultiplyUint64( const unsigned __int64& a, const unsigned __int64& b, unsigned __int64* pRet )
{
    ....
}

This means every translation unit that includes safeint3.hpp will get a definition of IntrinsicMultiplyUint64. If you are willing to modify that file, you can make those functions inline:

inline bool IntrinsicMultiplyUint64( const unsigned __int64& a, const unsigned __int64& b, unsigned __int64* pRet )
{
    ....
}