https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117028
--- Comment #7 from Frank Heckenbach <f.heckenb...@fh-soft.de> --- (In reply to Joseph S. Myers from comment #5) > Obsolescence is generally unhelpful when there is no non-obsolescent > alternative in previous standard versions, given that much code needs to > work with a range of implementation and standard versions; octal literals > are extremely widely used and the new syntax doesn't exist before C23. So how about a new warning that is off by default and can be activated by those who want to convert their code, which can later become included in -Wall or -Wextra?