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How to: Detect /clr Compilation

Use the _MANAGED or _M_CEE macro to see if a module is compiled with /clr. For more information, see /clr (Common Language Runtime Compilation).

For more information about macros, see Predefined Macros.

// detect_CLR_compilation.cpp
// compile with: /clr
#include <stdio.h>

int main() {
   #if (_MANAGED == 1) || (_M_CEE == 1)
      printf_s("compiling with /clr\n");
      printf_s("compiling without /clr\n");