[Information] gcc '-O2' may skip some of uninitialized variableswarnings (exist almost 10 years).

[Chen Gang]

Hell All:

gcc '-O2' may skip some of uninitialized variables warnings which may be
real bugs. This is gcc issue which keep existence almost 10 years, and
now it seems can not be fixed in recent years.

Please reference: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18501, for
kernel special case, also can reference:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57856

If we want to see the warnings (for finding bugs), "EXTRA_CFLAGS=-W"
seems not enough (it use '-O2'), I recommend also to try '-O0' (although
it may also print many spurious warnings)


Thanks.
-- 
Chen Gang
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