n8blog » C http://www.n8gray.org distraction in action Thu, 01 Jul 2010 18:21:04 +0000 http://wordpress.org/?v=2.8.6 en hourly 1 GCC Preprocessor Defines http://www.n8gray.org/blog/2004/07/27/gcc-preprocessor-defines/ http://www.n8gray.org/blog/2004/07/27/gcc-preprocessor-defines/#comments Tue, 27 Jul 2004 07:14:00 +0000 n8 http://www.n8gray.org/sandbox/wordpress/?p=74 Here's a useful tidbit that I thought I would share. If you want to find out all of the built-in #define's that GCC gives you, try this:

touch dummy_file.c; gcc -E -dM dummy_file.c

On recent versions of GCC this will give you a list of all the predefined macros. On older systems (I don't know how far back) you can try this:

gcc -dumpspecs

It's harder to read, but many of the platform-specific macros are in there.Share/Bookmark]]> http://www.n8gray.org/blog/2004/07/27/gcc-preprocessor-defines/feed/ 2