PG Bug reporting form <noreply@postgresql.org> writes:
> localtime.c:135:40: warning: code will never be executed
> [-Wunreachable-code]
> result -= !TWOS_COMPLEMENT(int32) && result != 0;
> ^~~~~~
[ and much more in the same vein ]
We're unlikely to change any of these, so I'd recommend turning off
-Wunreachable-code.
localtime.c is a clone of the IANA timezone code, so we're certainly
not going to change it unless they do (which I doubt they would).
bootparse.c, and some of the other files you mention, are code generated
by bison, which we have no control over. Most of the rest of these
are already manually commented as being unreachable; they're there
partly for belt-and-suspenders reasons, and partly because some other
compilers will warn if we don't have them.
regards, tom lane