Hi, I meet some trouble in build GCC on Ubuntu 9.04.
I have the same question: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39738
I use cross mingw: http://sourceforge.net/projects/mingw-cross/

My configure is:
../../src/gcc/configure --enable-languages=c,c++
--enable-cxx-flags='-fno-function-sections -fno-data-sections'
--enable-fully-dynamic-string --enable-version-specific-runtime-libs
--enable-threads=win32 --disable-nls --disable-shared --disable-werror
--disable-symvers --disable-libstdcxx-pch --disable-win32-registry
--disable-sjlj-exceptions --with-gmp=/usr/local --with-mpfr=/usr/local
--with-pkgversion='qp mingw32'
--with-bugurl=http://www.qpsoft.com/blog/guestbook.php --without-x
--host=i686-pc-mingw32 --build=i686-pc-linux-gnu --target=mingw32
--prefix=/mingw

make all-gcc # succeed
sudo make install-gcc # succeed
make all-target-libstdc++-v3 # failed
sudo make install-target-libstdc++-v3

The Error Info:
In file included from
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/type_traits:51,
                 from
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/bits/move.h:38,
                 from
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/bits/stl_pair.h:60,
                 from
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/utility:63,
                 from
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tuple:38,
                 from
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/mutex:39,
                 from ../../../../../src/gcc/libstdc++-v3/src/atomic.cc:28:
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:233:
error: invalid qualifiers on non-member function type
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:233:
error: redefinition of 'struct std::is_function<_Res ()(_ArgTypes ...)>'
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:228:
error: previous definition of 'struct std::is_function<_Res ()(_ArgTypes ...)>'
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:236:
error: invalid qualifiers on non-member function type
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:236:
error: redefinition of 'struct std::is_function<_Res ()(_ArgTypes ..., ...)>'
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:231:
error: previous definition of 'struct std::is_function<_Res ()(_ArgTypes ...,
...)>'
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:239:
error: invalid qualifiers on non-member function type
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:239:
error: redefinition of 'struct std::is_function<_Res ()(_ArgTypes ...)>'
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:228:
error: previous definition of 'struct std::is_function<_Res ()(_ArgTypes ...)>'
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:242:
error: invalid qualifiers on non-member function type
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:242:
error: redefinition of 'struct std::is_function<_Res ()(_ArgTypes ..., ...)>'
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:231:
error: previous definition of 'struct std::is_function<_Res ()(_ArgTypes ...,
...)>'
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:245:
error: invalid qualifiers on non-member function type
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:245:
error: redefinition of 'struct std::is_function<_Res ()(_ArgTypes ...)>'
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:228:
error: previous definition of 'struct std::is_function<_Res ()(_ArgTypes ...)>'
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:248:
error: invalid qualifiers on non-member function type
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:248:
error: redefinition of 'struct std::is_function<_Res ()(_ArgTypes ..., ...)>'
/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/include/tr1_impl/type_traits:231:
error: previous definition of 'struct std::is_function<_Res ()(_ArgTypes ...,
...)>'
make[3]: *** [atomic.lo] ´íÎó 1
make[3]:ÕýÔÚÀ뿪Ŀ¼ `/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3/src'
make[2]: *** [all-recursive] ´íÎó 1
make[2]:ÕýÔÚÀ뿪Ŀ¼ `/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3'
make[1]: *** [all] ´íÎó 2
make[1]:ÕýÔÚÀ뿪Ŀ¼ `/home/loaden/mingw/obj/gcc/mingw32/libstdc++-v3'
make: *** [all-target-libstdc++-v3] ´íÎó 2
loa...@qpsoft:~/mingw/obj/gcc$


-- 
           Summary: Cross compiled failed: invalid qualifiers on non-member
                    function type
           Product: gcc
           Version: 4.4.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: loaden at gmail dot com
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-mingw32
GCC target triplet: mingw32


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40231

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