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Older g++ (<9.3) mishandle the alignas specifier (raise warnings that the alignment is too large), but the more or less equivalent attribute works. So as a workaround, #define alignas to that attribute for those versions. see <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89357> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://www.postgresql.org/message-id/3119480.1769189606%40sss.pgh.pa.us