[Bug c++/31449] New: static_cast can remove const-ness

["simon_baldwin at yahoo dot com" <gcc-bugzilla at gcc dot gnu dot org>]

The following const-incorrect program compiles without error on gcc 4.1.0, and
4.3.0 20070323:

class Foo {};
class Bar : public Foo {};
static const Foo *foo = 0;

static Bar *bar = static_cast<const Bar*>(foo);  // Error, casts away const

void func(const Foo *foo) {
  Bar *bar = static_cast<const Bar*>(foo);  // Error, casts away const
}

gcc 2.95.3, 3.4.5, and 4.0.2 report errors on the commented lines above, so it
looks like a compiler regression in 4.1.0.

I looked hard through existing PRs, and couldn't find this reported elsewhere
(the closest is PR 20475, but it's concerned with 3.4.4 and the const-ness, or
otherwise, of string literals, so not the same).  I'd be a little surprised if
I'm the first to see it, but it's possible...


-- 
           Summary: static_cast can remove const-ness
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: simon_baldwin at yahoo dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31449