Perhaps we could write a script that compiles packages in portage with both ICC 
and GCC and runs them with different flags.  I think there was an effort on the 
GCC side already to test flags with specific packages.  We can then have the 
script run time on the applications doing work (again, that's a lot of packages 
for a lot of different tasks).  If we can store these in the portage tree (yes, 
it's more metadata), the user can actually benefit well from the optimizations.
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