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If a particular output file already exists with the contents it should have, leave it alone, so that its mod timestamp is not advanced. In builds using --enable-depend, this can avoid the need to recompile .c files whose included files didn't actually change. It's not clear whether it saves much of anything for users of ccache; but the cost of doing the file comparisons seems to be negligible, so we might as well do it. For developers using the MSVC toolchain, this will create a regression: msvc/Solution.pm will sometimes run genbki.pl or Gen_fmgrtab.pl unnecessarily. I'll look into fixing that separately. Discussion: https://postgr.es/m/16925.1525376229@sss.pgh.pa.us |
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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/.