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* How to see macros expansion?

** GCC.

  $ cpp <file>.c

** MSVC.

  $ cl /E <file>.c

* Who to see predefined macros?

See

  http://predef.sourceforge.net/
  http://en.wikipedia.org/wiki/C_preprocessor#Compiler-specific_predefined_macros

** GNU C Compiler.

  $ gcc -dM -E - < /dev/null

** HP-UX ansi C compiler.

  $ cc -v EMPTY.c

** SCO OpenServer C compiler.

  $ cc -## EMPTY.c

** Sun Studio C/C++ compiler.

  $ cc -## EMPTY.c