Simulated optimization -Og possible on <4.8 gcc?

[Gene Smith <gds@xxxxxxxxxxxxx>]

I see there is a new optimization option -Og in 4.8.x gcc. However, I am 
still using earlier gcc version 4.5.2.  Is it possible to get the 
effects of -Og by using -O1 and with selective -fno-* options?

The 4.8.x gcc manual does not state which -f* options are used in -Og 
like it does for the others, -O1 etc. (However, I realize that even with 
this information it may not be possible to simulate the new -Og option 
exactly just by excluding various options.)

Note: Could possibly move to gcc 4.7.3 if that makes a difference but 
moving to 4.8 now is not possible.

Thanks,
-gene