A little trick i read from LuaJit's makefile and the gcc manual page. To list all built-in defines use the following (assuming that you don't have yohan.h file on the current directory..)
# touch yohan.h
# gcc -E -dM yohan.h
and if the "yohan.h" contains your own code of defines, it will also be resolved.. giving you the exact picture of what's happening with your sources defines
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