Mixing debug and release library/binary - bad practice?

Question

Is it a bad practice to use a release version of 3rd party library in debug binary?

I am using a 3rd party library and compiled a release .lib library. My exe is in

Answer 1

The fact that it doesn't compile should be sufficient to prove it's bad practice.

Regarding maintaining separate builds - you don't need to do that. Here's a workaround that previously worked for me:

#ifdef _DEBUG
#define DEBUG_WAS_DEFINED
#undef _DEBUG
#endif

#include 

#ifdef DEBUG_WAS_DEFINED
#define _DEBUG
#endif

Let me know if this works for you.