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The fallback implementation involves acquiring and releasing a spinlock variable that is otherwise unreferenced --- not even to the extent of initializing it. This accidentally fails to fail on platforms where spinlocks should be initialized to zeroes, but elsewhere it results in a "stuck spinlock" failure during startup. I griped about this last July, and put in a hack that worked for gcc on HPPA, but didn't get around to fixing the general case. Per the discussion back then, the best thing to do seems to be to initialize dummy_spinlock in main.c.
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/.