[Bug libc/21972] New: assert macro requires operator== (int) for its argument type

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21972

            Bug ID: 21972
           Summary: assert macro requires operator== (int) for its
                    argument type
           Product: glibc
           Version: 2.26
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

After the fix for bug 21242, the assert macro implementation requires that the
argument can be compared to 0, which breaks the following code:

#include <assert.h>

struct S {
  explicit operator bool() const;
};

void f(S &s)
{
  assert (s);
}

The C++ standard is inconsistent due to its C standard import, but we should
fix this as a QoI issue.  Using static_cast<bool> (expr) instead is sufficient.

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