Despite the egcs-c++ package description, the shared
libstdc++ is included. It ought to be in the libstdc++
package only:

  rpm -qf /usr/lib/libstdc++-2-libc6.1-1-2.9.0.so
  egcs-c++-1.1.2-12
  libstdc++-2.9.0-12

  egcs-c++
  It does include the static standard C++ library and
  C++ header files; the library for dynamically linking
  programs is available separately.

Due to dependencies one cannot remove the libstdc++ package,
but one can remove the egcs-c++ package (*without* --nodeps)
which in turn will remove the shared library and thus breaks
any depending programs:

  rpm -e libstdc++
  error: removing these packages would break dependencies:
    [snip]

  rpm -e egcs-c++
    [/usr/lib/libstdc++-2-libc6.1-1-2.9.0.so now gone]

  kwm
  kwm: error in loading shared libraries:
libstdc++-libc6.1-1.so.2:
  cannot open shared object file: No such file or directory