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Re: HOWTO: Find out about '#define(d)' constants?


To find out what symbols gcc (actually cpp) defines you
can do:

``cpp -dM < /dev/null''  ie:
    xerxes [~] % cpp -dM < /dev/null
    #define i386 1
    #define __OpenBSD__ 1
    #define __GNUC__ 1
    #define unix 1

    xap [~] % cpp -dM < /dev/null
    #define __ANSI_COMPAT 1
    #define __alpha__ 1
    #define __OpenBSD__ 1
    #define __GNUC__ 1
    #define __alpha 1

 - todd