[Bug c/92857] -Wsign-conversion flag issues false positives for expression using typedef'ed unsigned types

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92857

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
      Known to fail|                            |9.2.0

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think the warning is about foo - bar being carried out in type 'int' due to
integer promotion and that converted to size_t which may turn the negative
result into a positive.