Should I compile with /MD or /MT?

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By dynamically linking with /MD,

  • you are exposed to system updates (for good or ill),
  • your executable can be smaller (since it doesn’t have the library embedded in it), and
  • I believe that at very least the code segment of a DLL is shared amongst all processes that are actively using it (reducing the total amount of RAM consumed).

I’ve also found that in practice, when working with statically-linked 3rd-party binary-only libraries that have been built with different runtime options, /MT in the main application tends to cause conflicts much more often than /MD (because you’ll run into trouble if the C runtime is statically-linked multiple times, especially if they are different versions).

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