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In general, Postgres requires -fno-strict-aliasing with compilers that implement C99 strict aliasing rules. There's little hope of getting rid of that overall. But it seems like it would be a good idea if storage/checksum_impl.h in particular didn't depend on it, because that header is explicitly intended to be included by external programs. We don't have a lot of control over the compiler switches that an external program might use, as shown by Michael Banck's report of failure in a privately-modified version of pg_verify_checksums. Hence, switch to using a union in place of willy-nilly pointer casting inside this file. I think this makes the code a bit more readable anyway. checksum_impl.h hasn't changed since it was introduced in 9.3, so back-patch all the way. Discussion: https://postgr.es/m/1535618100.1286.3.camel@credativ.de |
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