https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83107
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |marxin at gcc dot gnu.org
Resolution|--- |INVALID
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
> I think it is a bug because, for example, (unsigned long int)1<<32 is just a
> recast of the result of 1<<32.
> 1 is an int, so 1<<32 is also an int with the value 0, which is eventually
> recast into an unsigned long int.
> So -Wshift-count-overflow should report the count overflow.
It's not bug because the expression is equivalent to:
auto val2 = ((unsigned long int)1)<<32;
Which is correct. You are talking about:
pr83107.cpp:5:37: warning: left shift count >= width of type
[-Wshift-count-overflow]
auto val3 = (unsigned long int)(1<<32);
