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libpq and ecpg need shared-library-friendly versions of assorted src/port/ and src/common/ modules. Up to now, they got those by symlinking the individual source files and compiling them locally. That's baroque, and a pain to maintain, and it results in some amount of duplicated compile work. It might've made sense when only a couple of files were needed, but the list has grown and grown and grown :-( It makes more sense to have the originating directory build a third variant of libpgport.a/libpgcommon.a containing modules built with $(CFLAGS_SL), and just link that into the shared library. Unused files won't get linked, so the end result should be the same. This patch makes a down payment on that idea by having src/port/ build such a library and making libpq use it. If the buildfarm doesn't expose fatal problems with the approach, I'll extend it to the other cases. Discussion: https://postgr.es/m/13022.1538003440@sss.pgh.pa.us
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: https://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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.