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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.
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File-free version:
echo ” | gcc -E -dM