[Bug c/80801] New: Error "void value not ignored as it ought to be" is a bit cryptic

["gcc at martinien dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80801

            Bug ID: 80801
           Summary: Error "void value not ignored as it ought to be" is a
                    bit cryptic
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gcc at martinien dot de
  Target Milestone: ---

This code returns a not-very-intuitive error:

$ cat void.cpp
void func()
{
}

int main()
{
  return func();
}
$ g++ -c void.cpp
void.cpp: In function 'int main()':
void.cpp:7:15: error: void value not ignored as it ought to be
   return func();
               ^

In this small example it is clear, for complex code it might not be obvious
what the error is.

clang is a little bit more helpful:

void.cpp:7:10: error: cannot initialize return object of type 'int' with an
rvalue of type 'void'
  return func();
         ^~~~~~
1 error generated.


Best regards,
Martin