/bin/sh /var/tmp/portage/gcc-3.3.6/work/gcc-3.3.6/libstdc++-v3/docs/doxygen/run_doxygen \
             --mode=man ${srcdir} ${builddir})
 :: NOTE that this may take some time...
/usr/bin/doxygen /var/tmp/portage/gcc-3.3.6/work/build/i686-pc-linux-gnu/libstdc++-v3/docs/doxygen/man.cfg

Well, doesn't the above note explain it all? Personnally I'm not using doxygen so I had no problems with the gcc upgrade...

When you say "system hangs", you don't say if it's hanging for minutes, hours, whatever. But since it's running against a config file in /var/tmp/portage/gcc-3.3.6/work/build/i686-pc-linux-gnu/libstdc++-v3, I'd be willing to bet that it will take a great deal of time to complete.

Perhaps you need to remove something from your USE flags to keep doxygen from running during the gcc build, or try giving it enough time to complete.
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