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output format of gcc -E?


OK, I found it once before, but it eludes me now.  Where is
the output format of gcc -E defined?  In particular, what do
the numbers on the lines mean?  e.g. in the output
# 1 "/opt/cegl-2.0/powerpc-405-linux-gnu/gcc-3.3.2-glibc-2.3.2/powerpc-405-linux-gnu/sys-include/linux/kernel.h" 1 3 4
# 28 "/opt/cegl-2.0/powerpc-405-linux-gnu/gcc-3.3.2-glibc-2.3.2/powerpc-405-linux-gnu/sys-include/linux/sysctl.h" 2 3 4
what do the trailing "1 3 4" and "2 3 4" mean?
I'm trying to track down a problem compiling something with
a newer compiler, and I really need to be able to follow how
the preprocessor is working.

I would love it if http://gcc.gnu.org/onlinedocs/gcc-3.3.2/gcc/Overall-Options.html#Overall%20Options
either documented this or linked to the proper documentation.

Thanks,
Dan


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