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How can I find out what predefined symbols the compiler is using?



I am trying to use a header file that contains some stuff like this:

#ifdef __MWERKS__
...
#endif


#ifdef __GNUC__ ... #endif

The purpose of this is to enable certain #defines in my code. (Is there any other reason to do this??)

What I would like to know is how do you determine what the choices are for these types of #defines? The compiler obviously knows about __GNUC__, and maybe __MWERKS__, but is there a way for me to query the compiler about which ones of these it has defined? (And, what is the proper terminology for these symbols? I would happily google for this info if I knew what to call it.)

Paul
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