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Revert the PL/Perl-specific change in 9a95a77d9d5d3003d2d67121f2731b6e5fc37336. We must not prevent Perl from using stdbool.h when it has been built to do so, even if it uses an incompatible size. Otherwise, we would be imposing our bool on Perl, which will lead to crashes because of the size mismatch. Instead, we undef bool after including the Perl headers, as we did previously, but now only if we are not using stdbool.h ourselves. Record that choice in c.h as USE_STDBOOL. This will also make it easier to apply that coding pattern elsewhere if necessary.
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/.