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In an in-tree build, "make coverage-html" invoked lcov with two "-d ." options, because $(srcdir) is just ".". With lcov 2.0 (and perhaps earlier versions?) that results in scanning every foo.gcda file twice and producing counts twice what they should be. With later lcov versions (at least 2.3), it results in "duplicate file" errors. In VPATH builds we do need two -d options to cover both regular and generated .c files. But in in-tree builds it suffices to specify "-d .", so suppress the second switch. Author: Narek Galstyan <narek.galstyan@enterprisedb.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAHsn6_xCDQWe8_vVFhtFk27_xTdyVV+Dr0yWzaooBZ6+-VH-5w@mail.gmail.com Backpatch-through: 14
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/.