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We use "clang" to compile bitcode files for LLVM inlining. That might be different from the build's main C compiler, so it needs its own set of compiler flags. To simplify configure, we don't bother adding any -W switches to that flag set; there's little need since the main build will show us any warnings. However, if we don't want to see unwanted warnings, we still have to add any -Wno-warning switches we'd normally use with clang. This escaped notice before commit 9ff47ea41, which tried to add -Wno-compound-token-split-by-macro; buildfarm animals using mismatched CC and CLANG still showed those warnings. I'm not sure why we never saw any effects from the lack of -Wno-unused-command-line-argument (maybe that's only activated by -Wall?). clang does not currently support -Wno-format-truncation or -Wno-stringop-truncation, although in the interests of future-proofing and consistency I included tests for those. Back-patch to v11 where we started building bitcode files. Discussion: https://postgr.es/m/2921539.1637254619@sss.pgh.pa.us
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/.