https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99624
--- Comment #8 from Vittorio Zecca <zeccav at gmail dot com> --- Address sanitizer of Version 11.0.1 current trunk miscompiles the Ada compiler, maybe a previous version would work. Undefined behavior sanitizer works. I am now trying to build the Ada compiler with gcc 9.1.0.