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symlink() and readlink() are in SUSv2 and all targeted Unix systems have them. We have partial emulation on Windows. Code that raised runtime errors on systems without it has been dead for years, so we can remove that and also references to such systems in the documentation. Define HAVE_READLINK and HAVE_SYMLINK macros on Unix. Our Windows replacement functions based on junction points can't be used for relative paths or for non-directories, so the macros can be used to check for full symlink support. The places that deal with tablespaces can just use symlink functions without checking the macros. (If they did check the macros, they'd need to provide an #else branch with a runtime or compile time error, and it'd be dead code.) Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/CA+hUKGJ3LHeP9w5Fgzdr4G8AnEtJ=z=p6hGDEm4qYGEUX5B6fQ@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/.