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At least on linux, set_ps_display() breaks /proc/$pid/environ. The sanitizer's
helper library uses /proc/$pid/environ to implement getenv(), as it wants to
work independent of libc. When just using undefined and alignment sanitizers,
the sanitizer library is only initialized when the first error occurs, by
which time we've often already called set_ps_display(), preventing the
sanitizer libraries from seeing the options.
We can work around that by defining __ubsan_default_options, a weak symbol
libsanitizer uses to get defaults from the application, and return
getenv("UBSAN_OPTIONS"). But only if main already was reached, so that we
don't end up relying on a not-yet-working getenv().
As it's just a function that won't get called when not running a sanitizer, it
doesn't seem necessary to make compilation of the function conditional.
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/20220323173537.ll7klrglnp4gn2um@alap3.anarazel.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/.