https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101645

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|-Wsign-conversion misses    |warn about neg of unsigned
                   |negation of unsigned int    |type should be added to
                   |                            |-Wsign-conversion
           Keywords|                            |diagnostic
           Severity|normal                      |enhancement

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I don't know if this is useful to even to add to -Wsign-conversion.
The documentation is clear here:
Warn for implicit conversions that may change the sign of an integer value,
like assigning a signed integer expression to an unsigned integer variable. 

- is just two comp not rather than neg :)

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