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When compiling with GCC 10.x and -O3 optimization, the IP checksum calculation code generates wrong checksum. The function uint16_checksum gets inlined during optimization and ip4pkt->tcp data gets wrongly aliased. BUG: https://bugzilla.samba.org/show_bug.cgi?id=14537 Signed-off-by: Amitay Isaacs <amitay@gmail.com> Reviewed-by: Martin Schwenke <martin@meltin.net> Autobuild-User(master): Martin Schwenke <martins@samba.org> Autobuild-Date(master): Wed Oct 21 05:52:28 UTC 2020 on sn-devel-184