[Bug c++/53462] New: template method constant folding division-by-zero warning within dead code

[rikaigcc at rikai dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53462

             Bug #: 53462
           Summary: template method constant folding division-by-zero
                    warning within dead code
    Classification: Unclassified
           Product: gcc
           Version: 4.4.6
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: rikai...@rikai.com


This code:

#include <stdio.h>
template <int I> struct foo {
  static void bar() {
    if (I && 10/I > 2) {
      printf("Hello world\n");
    }
  }
};
int main(int, char**) {
  foo<0>::bar();
  return(0);
}

yields:

/tmp/t.cc: In static member function ‘static void foo<I>::bar() [with int I =
0]’:
/tmp/t.cc:10:   instantiated from here
/tmp/t.cc:4: warning: division by zero

(but the division by zero is protected).