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Various Perl scripts we use to generate files were in the habit of printing things like "generated by $0" into their output files. That looks like a fine idea at first glance, but it results in non-reproducible output, because in VPATH builds $0 won't be just the name of the script file, but a full path for it. We'd prefer that you get identical results whether using VPATH or not, so this is a bad thing. Some of these places also printed their input file name(s), causing an additional hazard of the same type. Hence, establish a policy that thou shalt not print $0, nor input file pathnames, into output files (they're still allowed in error messages, though). Instead just write the script name verbatim. While we are at it, we can make these annotations more useful by giving the script's full relative path name within the PG source tree, eg instead of Gen_fmgrtab.pl let's print src/backend/utils/Gen_fmgrtab.pl. Not all of the changes made here actually affect any files shipped in finished tarballs today, but it seems best to apply the policy everyplace so that nobody copies unsafe code into places where it could matter. Christoph Berg and Tom Lane Discussion: https://postgr.es/m/20171215102223.GB31812@msg.df7cb.de
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/.