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On some platforms, -fpic fails for sufficiently large shared libraries. We've mostly not hit that boundary yet, but there are some extensions such as Citus and pglogical where it's becoming a problem. A bit of research suggests that the penalty for -fPIC is small, in the single-digit-percentage range --- and there's none at all on popular platforms such as x86_64. So let's just default to -fPIC everywhere and provide one less thing for extension developers to worry about. Per complaint from Christoph Berg. Back-patch to all supported branches. (I did not bother to touch the recently-removed Makefiles for sco and unixware in the back branches, though. We'd have no way to test that it doesn't break anything on those platforms.) Discussion: https://postgr.es/m/20170529155850.qojdfrwkkqnjb3ap@msg.df7cb.de