Is 'optimized' a legit target?

[John Rose]

Yes, 'optimized' is legit.  It supports more flags, for tuning  
experiments, etc.
Its performance characteristics are closer to product, because
it omits all the 'assert' code,

Here are the various build subdirectories, in brief:

product -- hardwires many flag values, no asserts, code is optimized
optimized -- most flag values variable, no asserts, code is optimized
fastdebug -- all flag values variable, asserts enabled, code is  
optimized
jvmg -- all flag values variable, asserts enabled, code not optimized  
(debuggable)
generated -- machine-generated source code and other stuff created  
during the build process
debug -- old name for jvmg; this one should go away
profiled -- dead a long time; this one should have gone away years ago

Best,
-- John