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This commit adds a function to perform a cross-check between the initial value of the C declaration associated to a GUC and its actual boot value in assert-enabled builds. The purpose of this is to prevent anybody reading these C declarations from being fooled by mismatched values before they are loaded at program startup. The following rules apply depending on the GUC type: * bool - can be false, or same as boot_val. * int - can be 0, or same as the boot_val. * real - can be 0.0, or same as the boot_val. * string - can be NULL, or strcmp'd equal to the boot_val. * enum - equal to the boot_val. This is done for the system as well custom GUCs loaded by external modules, which may require extension developers to adapt the C declaration of the variables used by these GUCs (testing this change with some of my own modules has allowed me to catch some stupid typos, FWIW). This may finish by being a bad experiment depending on the feedbcak received, but let's see how it goes. Author: Peter Smith Reviewed-by: Nathan Bossart, Tom Lane, Michael Paquier, Justin Pryzby Discussion: https://postgr.es/m/CAHut+PtHE0XSfjjRQ6D4v7+dqzCw=d+1a64ujra4EX8aoc_Z+w@mail.gmail.com
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/.