[Bug driver/111654] New: Introduce clang's invalid-noreturn warning

[tanksherman27 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111654

            Bug ID: 111654
           Summary: Introduce clang's invalid-noreturn warning
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: driver
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tanksherman27 at gmail dot com
  Target Milestone: ---

Created attachment 56022
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56022&action=edit
Patch to add invalid-noreturn to gcc

clang has a toggleable warning flag named invalid-noreturn for noreturn
functions that return either implicitly or explicitly, while gcc has different
warnings for both explicit and implicit cases. We should add this warning (with
an extra level of tuneability since unlike clang gcc has different warnings for
each) for compatibility with clang, and for utility purposes since code may
desire to mark functions as noreturn even though it may (in the compiler's
point of view) return