https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66162
--- Comment #6 from simon at pushface dot org --- (In reply to Eric Botcazou from comment #3) > That's not the problem., just avoid using -gnatc on the runtime. Eric, In PR64866 comment 2, Arno said "Visibility in the Ada runtime do not follow standard Ada rules. In other words, the Ada runtime isn't implemented in Ada, but in a different dialect very close to Ada, with additional restrictions.” He notes two of the additional restrictions: is there a writeup anywhere of the language restrictions and usage restrictions like this one? Thanks, --S