[Bug c++/29803] New: Program links only at -O2 or above

[bagnara at cs dot unipr dot it]

// The optimization level should not prevent a conforming program
// to compile and link correctly.  This program shows that this
// is not the case for GCC 4.1.1.

template <typename T>
struct c  {
  static const int a = 3;
  static const int b = 4;
};

// If the following `#if 0' is turned into `#if 1', then the program
// links only with -O2 and higher optimization levels.
#if 0
int not_ok() {
  return c<int>().a;
}

int not_ok(bool b) {
  return b ? c<int>::a : c<int>::b;
}
#endif

// The following functions should be completely equivalent to the
// above ones, but these do not cause any linking problem, whatever
// the optimization level is.
int ok() {
  // How is this different from `return c<int>().a'?
  return c<int>::a;
}

int ok(bool b) {
  // How is this different from `return b ? c<int>::a : c<int>::b'?
  if (b)
    return c<int>::a;
  else
    return c<int>::b;
}


int main(int, char**) {
}


-- 
           Summary: Program links only at -O2 or above
           Product: gcc
           Version: 4.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bagnara at cs dot unipr dot it
  GCC host triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29803