Who defines the platform specific macros eg LINUX VXWORKS etc

From: "lovecreatesbeauty@xxxxxxxxx" <lovecreatesbeauty@xxxxxxxxx>
Date: Fri, 31 Oct 2008 02:44:16 -0700 (PDT)

Are these macros defined in Makefile or by some environment which can
detect the platform types?

/* common code here */

#ifdef LINUX

/* other os spefic code */

#elif defined VXWORKS

/* other os spefic code */

#elif defined MACOSX

/* other os spefic code */

#elif defined WIN32

/* other os spefic code */

#endif

/* common code here */
.

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