Fix the -O0 configuration and its warnings #557
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The CI configuration was using
CC='gcc -O0. However, this doesn't work! Because CFLAGS was unset,./configurewould set CFLAGS to-O2, resulting in a commandline ofgcc -O0 ... -O2 ....Fixing this reveals that GCC generates additional warnings when in
-O0mode. Presumably it doesn't do dead-code pruning, and so generates additional areas in provable-unreachable sections of code (which would be pruned in-O2).