[Bug c++/60664] bool / out of range int comparison warning failure

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60664

--- Comment #3 from David Binderman <dcb314 at hotmail dot com> ---
(In reply to David Binderman from comment #0)
> I've just built gcc trunk with clang and it looks as if producing
> a similar warning to clang will flush out five bugs in gcc trunk.

Five is now one.

$ fgrep "Wtautological-constant-out-of-range-compare" mk.out 
../../src/trunk/gcc/expr.c:5230:9: warning: comparison of constant -1 with
expression of type 'unsigned int' is always false
[-Wtautological-constant-out-of-range-compare]
$

      if (!SUBREG_CHECK_PROMOTED_SIGN (target,
                      TYPE_UNSIGNED (TREE_TYPE (exp))))
        {

However, for a build of most of Redhat Linux with clang, there are 
about 460 occurrences of this warning, so it still looks to be of
value for the wider world.