[Bug c++/49917] New: g++.dg/init/for1.C wrong?

["marc.glisse at normalesup dot org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49917

           Summary: g++.dg/init/for1.C wrong?
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: marc.glisse@normalesup.org


Hello,

I am having trouble understanding the test g++.dg/init/for1.C (copied below for
reference). For me, i and r are both 0 at first. a gets created. The loop
iterates twice, so i is 2 (not 1). a gets destroyed (so r is set to 1) and the
test returns 1. I noticed this because unrelated local patches cause a
testsuite failure.

#include <stdio.h>

int i;
int r;

class A
{
public:
  A() { printf("A ctor\n"); }
  ~A()
  {
    printf("A dtor\n");
    if (i != 1)
      r = 1;
  }
};

int main(int argc, char **argv)
{
  for (A a; i < 2; ++i) {
    printf("iteration %d\n", i);
  }

  return r;
}