How do I determine what C/C++ compilator is compiling my code?

If your source code is written for several compilers, one need to know what uniqe defines these compilers use. 

 IBM C/C++            __IBMCPP__

 Borland C++ for OS/2 __BORLANDC__

 EMX/GCC              __EMX__

 Watcom C/C++         __WATCOMC__

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