What's the preferred thing to do? I saw this over on SO:
"Using /MT is risky if you create DLLs as well as an EXE. You'll end up with multiple copies of the CRT in your program. This was especially a problem with earlier versions of VS where each CRT would get its own heap, not so much with VS2012. But you can still have ugly runtime problems when you have more than one "errno" variable for example. Using /MD is highly recommended to avoid such lossage."