valgrind uninitialized values

shell.session

$ clang++ -Wall --std=c++11 uninitialized.cpp -o main
$	valgrind --leak-check=full --show-leak-kinds=all --track-origins=yes ./main

==17245== Memcheck, a memory error detector
==17245== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==17245== Using Valgrind-3.10.1 and LibVEX; rerun with -h for copyright info
==17245== Command: ./main
==17245==
==17245== Conditional jump or move depends on uninitialised value(s)
==17245==    at 0x4EBFCDE: std::ostreambuf_iterator<char, std::char_traits<char> > std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::_M_insert_int<long>(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, long) const (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==17245==    by 0x4EC02BC: std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::do_put(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, long) const (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==17245==    by 0x4ECC06D: std::ostream& std::ostream::_M_insert<long>(long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==17245==    by 0x400857: main (in /home/ehtesh/tmp/stl-rewrite-2/main)
==17245==  Uninitialised value was created by a heap allocation
==17245==    at 0x4C2B800: operator new[](unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==17245==    by 0x400827: main (in /home/ehtesh/tmp/stl-rewrite-2/main)
==17245==
==17245== Use of uninitialised value of size 8
==17245==    at 0x4EBFBC3: ??? (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==17245==    by 0x4EBFD05: std::ostreambuf_iterator<char, std::char_traits<char> > std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::_M_insert_int<long>(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, long) const (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==17245==    by 0x4EC02BC: std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::do_put(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, long) const (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==17245==    by 0x4ECC06D: std::ostream& std::ostream::_M_insert<long>(long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==17245==    by 0x400857: main (in /home/ehtesh/tmp/stl-rewrite-2/main)
==17245==  Uninitialised value was created by a heap allocation
==17245==    at 0x4C2B800: operator new[](unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==17245==    by 0x400827: main (in /home/ehtesh/tmp/stl-rewrite-2/main)
==17245==
==17245== Conditional jump or move depends on uninitialised value(s)
==17245==    at 0x4EBFBCF: ??? (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==17245==    by 0x4EBFD05: std::ostreambuf_iterator<char, std::char_traits<char> > std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::_M_insert_int<long>(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, long) const (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==17245==    by 0x4EC02BC: std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::do_put(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, long) const (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==17245==    by 0x4ECC06D: std::ostream& std::ostream::_M_insert<long>(long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==17245==    by 0x400857: main (in /home/ehtesh/tmp/stl-rewrite-2/main)
==17245==  Uninitialised value was created by a heap allocation
==17245==    at 0x4C2B800: operator new[](unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==17245==    by 0x400827: main (in /home/ehtesh/tmp/stl-rewrite-2/main)
==17245==
==17245== Conditional jump or move depends on uninitialised value(s)
==17245==    at 0x4EBFD33: std::ostreambuf_iterator<char, std::char_traits<char> > std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::_M_insert_int<long>(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, long) const (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==17245==    by 0x4EC02BC: std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::do_put(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, long) const (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==17245==    by 0x4ECC06D: std::ostream& std::ostream::_M_insert<long>(long) (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19)
==17245==    by 0x400857: main (in /home/ehtesh/tmp/stl-rewrite-2/main)
==17245==  Uninitialised value was created by a heap allocation
==17245==    at 0x4C2B800: operator new[](unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==17245==    by 0x400827: main (in /home/ehtesh/tmp/stl-rewrite-2/main)
==17245==
0000000000000000000000000000000000000000000000000000000000000000==17245==
==17245== HEAP SUMMARY:
==17245==     in use at exit: 256 bytes in 1 blocks
==17245==   total heap usage: 1 allocs, 0 frees, 256 bytes allocated
==17245==
==17245== 256 bytes in 1 blocks are definitely lost in loss record 1 of 1
==17245==    at 0x4C2B800: operator new[](unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==17245==    by 0x400827: main (in /home/ehtesh/tmp/stl-rewrite-2/main)
==17245==
==17245== LEAK SUMMARY:
==17245==    definitely lost: 256 bytes in 1 blocks
==17245==    indirectly lost: 0 bytes in 0 blocks
==17245==      possibly lost: 0 bytes in 0 blocks
==17245==    still reachable: 0 bytes in 0 blocks
==17245==         suppressed: 0 bytes in 0 blocks
==17245==
==17245== For counts of detected and suppressed errors, rerun with: -v
==17245== ERROR SUMMARY: 257 errors from 5 contexts (suppressed: 0 from 0)

uninitialized.cpp

#include <iostream>

int main(int argc, char** argv){
    int *s = new int[64];

    for (auto i=0; i<64; i++){
        std::cout << s[i];
    }
}