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Our version was different from the upstream version in that we tried to use all possible pthread-related flags that the compiler accepts, rather than just the first one that works. That change was made in commit e48322a6d6cfce1ec52ab303441df329ddbc04d1, to work-around a bug affecting GCC versions 3.2 and below (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=8888), although we didn't realize that it was a GCC bug at the time. We hardly care about that old GCC versions anymore, so we no longer need that workaround. This fixes the macro for compilers that print warnings with the chosen flags. That's pretty annoying on its own right, but it also inconspicuously disabled thread-safety, because we refused to use any pthread-related flags if the compiler produced warnings. Max Filippov reported that problem when linking with uClibc and OpenSSL. The warnings-check was added because the workaround for the GCC bug caused warnings otherwise, so it's no longer needed either. We can just use the upstream version as is. If you really want to compile with GCC version 3.2 or older, you can still work-around it manually by setting PTHREAD_CFLAGS="-pthread -lpthread" manually on the configure command line. Backpatch to 9.5. I don't want to unnecessarily rock the boat on stable branches, but 9.5 seems like fair game.
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/.