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

• Subject: Re: How can I find out what predefined symbols the compiler is using?
• From: Greg Parker <email@hidden>
• Date: Thu, 31 Aug 2006 13:06:20 -0700
• Delivered-to: email@hidden
• Delivered-to: email@hidden

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?

Try this in a terminal:

% touch empty.c
% cc empty.c -E -dM -o - | sort
#define _ARCH_PPC 1
#define _BIG_ENDIAN 1
#define __APPLE_CC__ 5419
#define __APPLE__ 1
#define __BIG_ENDIAN__ 1
#define __CHAR_BIT__ 8
#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
...

Compiler flags and source language can change the built-in definitions.

(And, what is the proper terminology for these symbols? I would happily google for this info if I knew what to call it.)

--
Greg Parker     email@hidden

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