The shared libraries can't work correctly in GCC 4.0.0 with MingW32

[heromyth <zxpmyth@xxxxxxxxxxxx>]

I have compiled GCC 4.0.0 with MingW32, and use it to compile STLport 
CVS Libraries. I got a shared library and a static one. There is no 
problem in compiling and linking my code with the static library. And 
the EXE file works perfectly. When using the shared library instead, I 
got a EXE file which can't work. Running it, show belown:


terminate called after throwing an instance of 'std::bad_cast'
  what():  St8bad_cast

abnormal program termination


Also, I can't compiled wxWidget 2.6.0 shared libraries. There is no 
problem in compiling and linking all the libraries with GCC 3.4.2, and 
these libraries work well. What's wrong with these. I am lost!  I 
compiled GCC 4.0.0 like this:

E:\>g++ -v
Using built-in specs.
Target: mingw32
Configured with: ../gcc-4.0.0/configure --with-gcc --with-gnu-ld 
--with-gnu-as --host=mingw32 --target=mingw32 --prefix=/mingw 
-enable-threads --enable-languages=c,c++ --disable-win32-registry 
--disable-shared --enable-sjlj-exceptions --disable-java-awt --without-x 
--enable-interpreter --enable-hash-synchronization --enable-libstdcxx-debug
Thread model: win32
gcc version 4.0.0