g++ 4.5.2 64-bit linking error

[lowtech@…]

Building a 64-bit binary with g++ 4.5.2 fails with linking error (Core2Duo, OS X 10.5.8, MacPorts 1.9.2, gcc 4.5.2_0)

ld warning: in /opt/local/lib/gcc45/libstdc++.dylib, file is not of required architecture
ld warning: in /opt/local/lib/gcc45/libgcc_ext.10.5.dylib, missing required architecture x86_64 in file
ld warning: in /opt/local/lib/gcc45/gcc/i386-apple-darwin9/4.5.2/libgcc.a, file is not of required architecture

C++ example code for testing from ​http://en.literateprograms.org/Sieve_of_Eratosthenes_%28C_Plus_Plus%29

32-bit version from above example builds well:

$ g++-mp-4.5 -O3 -o test32 test.cpp Sieve.cpp -m32
$ ./test32 25

Sieved over integers 1 to 25 in 0.036 ms (1440 ns per integer)

2
3
5
7
11
13
17
19
23

64-bit build process with errors:

$ g++-mp-4.5 -O3 -o test64 test.cpp Sieve.cpp -m64

ld warning: in /opt/local/lib/gcc45/libstdc++.dylib, file is not of required architecture
ld warning: in /opt/local/lib/gcc45/libgcc_ext.10.5.dylib, missing required architecture x86_64 in file
ld warning: in /opt/local/lib/gcc45/gcc/i386-apple-darwin9/4.5.2/libgcc.a, file is not of required architecture
Undefined symbols:
  "operator new(unsigned long)", referenced from:
      std::vector<unsigned long, std::allocator<unsigned long> >::operator=(std::vector<unsigned long, std::allocator<unsigned long> > const&) in cc9ixqLk.o
      sieve_of_eratosthenes(unsigned long) in ccajKxKL.o
      std::vector<unsigned long, std::allocator<unsigned long> >::_M_insert_aux(__gnu_cxx::__normal_iterator<unsigned long*, std::vector<unsigned long, std::allocator<unsigned long> > >, unsigned long const&) in ccajKxKL.o
  "___gxx_personality_v0", referenced from:
      EH_frame1 in cc9ixqLk.o
      EH_frame1 in ccajKxKL.o
  "operator delete(void*)", referenced from:
      _main in cc9ixqLk.o
      _main in cc9ixqLk.o
      std::vector<unsigned long, std::allocator<unsigned long> >::~vector() in cc9ixqLk.o
      std::vector<unsigned long, std::allocator<unsigned long> >::operator=(std::vector<unsigned long, std::allocator<unsigned long> > const&) in cc9ixqLk.o
      sieve_of_eratosthenes(unsigned long) in ccajKxKL.o
      sieve_of_eratosthenes(unsigned long) in ccajKxKL.o
      std::vector<bool, std::allocator<bool> >::~vector() in ccajKxKL.o
      std::vector<unsigned long, std::allocator<unsigned long> >::~vector() in ccajKxKL.o
      std::vector<unsigned long, std::allocator<unsigned long> >::_M_insert_aux(__gnu_cxx::__normal_iterator<unsigned long*, std::vector<unsigned long, std::allocator<unsigned long> > >, unsigned long const&) in ccajKxKL.o
  "std::basic_ostream<char, std::char_traits<char> >::put(char)", referenced from:
      _main in cc9ixqLk.o
      _main in cc9ixqLk.o
      _main in cc9ixqLk.o
  "std::ios_base::Init::~Init()", referenced from:
      global constructors keyed to test.cpp in cc9ixqLk.o
  "std::basic_ostream<char, std::char_traits<char> >& std::basic_ostream<char, std::char_traits<char> >::_M_insert<double>(double)", referenced from:
      _main in cc9ixqLk.o
      _main in cc9ixqLk.o
  "std::ctype<char>::_M_widen_init() const", referenced from:
      _main in cc9ixqLk.o
      _main in cc9ixqLk.o
      _main in cc9ixqLk.o
  "std::basic_ostream<char, std::char_traits<char> >::flush()", referenced from:
      _main in cc9ixqLk.o
      _main in cc9ixqLk.o
      _main in cc9ixqLk.o
  "std::basic_ostream<char, std::char_traits<char> >& std::basic_ostream<char, std::char_traits<char> >::_M_insert<unsigned long>(unsigned long)", referenced from:
      _main in cc9ixqLk.o
      _main in cc9ixqLk.o
  "std::ios_base::Init::Init()", referenced from:
      global constructors keyed to test.cpp in cc9ixqLk.o
  "std::__throw_bad_cast()", referenced from:
      _main in cc9ixqLk.o
      _main in cc9ixqLk.o
      _main in cc9ixqLk.o
  "std::basic_ostream<char, std::char_traits<char> >& std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)", referenced from:
      _main in cc9ixqLk.o
      _main in cc9ixqLk.o
      _main in cc9ixqLk.o
      _main in cc9ixqLk.o
  "std::__throw_bad_alloc()", referenced from:
      std::vector<unsigned long, std::allocator<unsigned long> >::operator=(std::vector<unsigned long, std::allocator<unsigned long> > const&) in cc9ixqLk.o
  "std::cout", referenced from:
      _main in cc9ixqLk.o
      _main in cc9ixqLk.o
      _main in cc9ixqLk.o
ld: symbol(s) not found
collect2: ld returned 1 exit status