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The possibly, depending on compiler settings, generated warning was "warning: `S_UNLOCK' redefined". The hppa spinlock implementation doesn't follow the rules of s_lock.h and provides a gcc specific implementation outside of the the part of the file that's supposed to do that. It does so to avoid duplication between the HP compiler and gcc. That unfortunately means that S_UNLOCK is already defined when the HPPA specific section is reached. Undefine the generic fallback S_UNLOCK definition inside the HPPA section. That's far from pretty, but has the big advantage of being simple. If somebody is interested to fix this in a prettier way... This presumably got broken in the course of 0709b7ee72. Discussion: 20150114225919.GY5245@awork2.anarazel.de Per complaint from Tom Lane.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.