[Bug c++/78032] New: Incorrect code generated

[patrick at motec dot com.au]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78032

            Bug ID: 78032
           Summary: Incorrect code generated
           Product: gcc
           Version: 6.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: patrick at motec dot com.au
  Target Milestone: ---

The following test case generates an invalid program using GCC 6.2.1 20160830:

The call to bar is eliminated and the resultant program does nothing.

#include <cstdio>

struct foo {
        foo(double);
        foo(float);
        explicit foo(unsigned);

        unsigned v;
};

void bar(foo x = 0u)
{
        printf("%d\n", x.v);
}

int main()
{
        bar();
        return 0;
}