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As of commit 287822068246a6ae30bb2c7191de727672ae6328, PL/Tcl will not compile against pre-8.0 Tcl, whereas it used to work (more or less anyway) with quite prehistoric versions. As long as we're moving these goalposts, let's reinstall them at someplace that has some thought behind it. This commit sets the minimum allowed Tcl version at 8.4, and rips out some bits of compatibility cruft that are in consequence no longer needed. Reasons for requiring 8.4 include: * 8.4 was released in 2002; there seems little reason to believe that anyone would want to use older versions with Postgres 9.6+. * We have no buildfarm members testing anything older than 8.4, and thus no way to know if it's broken. * We need at least 8.1 to allow enforcement of database encoding security (8.1 standardized Tcl on using UTF8 internally, before that it was pretty unpredictable). * Some versions between 8.1 and 8.4 allowed the backend to become multithreaded, which is disastrous. We need at least 8.4 to be able to disable the Tcl notifier subsystem to prevent that. A small side benefit is that we can make the code more readable by doing s/CONST84/const/g.
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/.