GCC version 4.4.4 Stable SVN rev. 158894, 2010.04.29 () ();
mingw runtime version 3.17.20100115; w32api version 3.14.20100225; gmp-4.3.2; mpfr-2.4.2-p3; ppl-0.10.2; cloog-ppl-0.15.9; libelf-0.8.13; Binutils 2.20.51.20100423; zlib-1.2.5; mpc-0.8.1; mingw-w64 (svn rev.2270 20100429),
pthreads 2.9.0.0 (static).

GCC configured with:

$ gcc -v
Using built-in specs.
Target: i686-pc-mingw32
Configured with: ../src/configure --prefix=/mingw_new --build=i686-pc-mingw32 --target=i686-pc-mingw32 --with-sysroot=/mingw_new --with-build-sysroot=/mingw_new --with-mpfr=/mingw_new/i686-pc-mingw32 --with-gmp=/mingw_new/i686-pc-mingw32 --with-ppl=/mingw_new/i686-pc-mingw32 --with-cloog=/mingw_new/i686-pc-mingw32 --with-mpc=/mingw_new/i686-pc-mingw32 --with-host-libstdcxx='-lstdc++ -lsupc++' --enable-static --enable-threads=win32 --enable-languages=c,c++,fortran,objc,obj-c++ --enable-version-specific-runtime-libs --enable-fully-dynamic-string --enable-sjlj-exceptions --disable-shared --disable-rpath --disable-win32-registry --disable-nls --disable-bootstrap --disable-multilib --with-gnu-ld --with-system-zlib
Thread model: win32
gcc version 4.4.4 (GCC)

$ x86_64-w64-mingw32-gcc -v
Using built-in specs.
Target: x86_64-w64-mingw32
Configured with: ../src/configure --prefix=/mingw_new --build=i686-pc-mingw32 --target=x86_64-w64-mingw32 --with-mpfr=/mingw_new/i686-pc-mingw32 --with-gmp=/mingw_new/i686-pc-mingw32 --with-ppl=/mingw_new/i686-pc-mingw32 --with-cloog=/mingw_new/i686-pc-mingw32 --with-mpc=/mingw_new/i686-pc-mingw32 --with-sysroot=/mingw_new --with-build-sysroot=/mingw_new --with-host-libstdcxx='-lstdc++ -lsupc++' --with-gnu-ld --with-system-zlib --enable-static --enable-threads=win32 --enable-languages=c,c++,fortran,objc,obj-c++ --enable-version-specific-runtime-libs --enable-fully-dynamic-string --enable-sjlj-exceptions --disable-shared --disable-rpath --disable-win32-registry --disable-bootstrap --disable-multilib --disable-nls
Thread model: win32
gcc version 4.4.4 (GCC)