C++ Errors getting ignored

true, but I don’t see a reason for Makefile in the C++ template to contain a flag which disables all compiler warnings by default, and which is responsible for many code issues reported here and on Friends of Replit. So it is a bug, if this is one.
-Wno-everything in Makefile should be replaced with -Wmost -Werror, and the user can make that just -Wmost if they know what they’re doing.