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There is concern that a blocking DNS lookup in libpq could stall a backend process (say, via FDW). Since there's currently no strong evidence that synchronous DNS is a popular option, disallow it entirely rather than warning at configure time. We can revisit if anyone complains. Per query from Andres Freund. Author: Jacob Champion <jacob.champion@enterprisedb.com> Discussion: https://postgr.es/m/p4bd7mn6dxr2zdak74abocyltpfdxif4pxqzixqpxpetjwt34h%40qc6jgfmoddvq