The function trx_rseg_update_wsrep_checkpoint() was modified as part of the Galera 4 merge. The following code is causing warning in GCC 8.2:
if (must_clear_rsegs) {
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XID null_xid;
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memset(&null_xid, 0, sizeof null_xid);
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null_xid.null();
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Also, it is writing unnecessarily much redo log. 10.4 introduced the MLOG_MEMSET record, which should be used here. We should need that object null_xid at all.
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