[Bug lto/47241] lto not work on mingw32, reporting 'ld.exe: could not unlink output file'

["dongsheng.song at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47241

--- Comment #17 from Dongsheng Song <dongsheng.song at gmail dot com> 2011-02-15 02:46:14 UTC ---
It seems that libstdc++.dll.a is too small:

$ file gcc-4.6-windows_i686-linux/i686-w64-mingw32/lib/libstdc++.dll.a
gcc-4.6-windows_i686-linux/i686-w64-mingw32/lib/libstdc++.dll.a: current ar
archive

$ ls -l gcc-4.6-windows_i686-linux/i686-w64-mingw32/lib/libstdc++.dll.a
-rwxr-xr-x 1 oracle dba 2260 Feb 15 10:34
gcc-4.6-windows_i686-linux/i686-w64-mingw32/lib/libstdc++.dll.a

$ i686-w64-mingw32-g++ Hello.cpp
gcc-4.6-windows_i686-linux/i686-w64-mingw32/lib/libstdc++.dll.a
/tmp/cc39V2U9.o:Hello.cpp:(.text+0x19): undefined reference to `std::cout'
/tmp/cc39V2U9.o:Hello.cpp:(.text+0x1e): undefined reference to
`std::basic_ostream<char, std::char_traits<char> >& std::operator<<
<std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&,
char const*)'
/tmp/cc39V2U9.o:Hello.cpp:(.text+0x26): undefined reference to
`std::basic_ostream<char, std::char_traits<char> >& std::endl<char,
std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
/tmp/cc39V2U9.o:Hello.cpp:(.text+0x2e): undefined reference to
`std::basic_ostream<char, std::char_traits<char>
>::operator<<(std::basic_ostream<char, std::char_traits<char> >&
(*)(std::basic_ostream<char, std::char_traits<char> >&))'
/tmp/cc39V2U9.o:Hello.cpp:(.text+0x47): undefined reference to
`std::ios_base::Init::~Init()'
/tmp/cc39V2U9.o:Hello.cpp:(.text+0x6a): undefined reference to
`std::ios_base::Init::Init()'
collect2: ld returned 1 exit status