[Bug libstdc++/93972] ranges::lexicographical_compare gives wrong answer for signed integers

[ppalka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93972

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-02-28
           Assignee|unassigned at gcc dot gnu.org      |ppalka at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Or for unsigned integral types wider than a byte...

#include <algorithm>
#include <assert.h>

int main()
{
  unsigned i[] = { 1 };
  unsigned j[] = { 256 };
  assert( std::ranges::lexicographical_compare(i, j) );
}

Apparently I didn't consult the memcmp check that's used by
std::lexicographical_compare when writing the ranges version.