[gentoo-user] downgrading gcc, stage 2

Hi,

while trying to get a "clean" system after downgrading gcc to
gcc-4.4.5. I encountered a field of black magick...more black
than magic at all:

To find broken libs I did these two commands:
    sudo find /usr/lib/. /lib/. /usr/bin/. -type f -name 'lib*[^a]' -exec ldd {} \; >! /tmp/librebuild.txt 2>&1
    cat /tmp/librebuild.txt | grep GLIB                                                                        

and got a list like this one:
    /usr/lib/./firefox/libxpcom.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by //usr/lib64/xulrunner-2.0/libxul.so)
    /usr/lib/./firefox/components/libdbusservice.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by //usr/lib64/xulrunner-2.0/libxul.so)
    /usr/lib/./firefox/components/libbrowsercomps.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by //usr/lib64/xulrunner-2.0/libxul.so)
    /usr/lib/./firefox/components/libmozgnome.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by //usr/lib64/xulrunner-2.0/libxul.so)
    /usr/lib/./libwpd-stream-0.9.so.9.0.4: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/./libwpd-stream-0.9.so.9.0.4)
    /usr/lib/./xulrunner-devel-2.0/sdk/lib/libxpcom.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by //usr/lib64/xulrunner-2.0/libxul.so)
    /usr/lib/./xulrunner-devel-2.0/sdk/lib/libxul.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/./xulrunner-devel-2.0/sdk/lib/libxul.so)
    /usr/lib/./ardour2/libpbd.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/./ardour2/libpbd.so)
    /usr/lib/./ardour2/libgtkmm2ext.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/./ardour2/libgtkmm2ext.so)
    /usr/lib/./ardour2/surfaces/libardour_powermate.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/./ardour2/surfaces/libardour_powermate.so)
    /usr/lib/./ardour2/surfaces/libardour_genericmidi.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/./ardour2/surfaces/libardour_genericmidi.so)
    /usr/lib/./ardour2/surfaces/libardour_tranzport.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/./ardour2/surfaces/libardour_tranzport.so)
    /usr/lib/./ardour2/surfaces/libardour_mackie.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/./ardour2/surfaces/libardour_mackie.so)
    /usr/lib/./ardour2/libardour.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/./ardour2/libardour.so)
    /usr/lib/./ardour2/libmidi++.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/./ardour2/libmidi++.so)
    /usr/lib/./ardour2/libardour_cp.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/./ardour2/libardour_cp.so)
    /usr/lib/./xulrunner-2.0/libxpcom.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by //usr/lib64/xulrunner-2.0/libxul.so)
    /usr/lib/./xulrunner-2.0/components/libdbusservice.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by //usr/lib64/xulrunner-2.0/libxul.so)
    /usr/lib/./xulrunner-2.0/components/libmozgnome.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by //usr/lib64/xulrunner-2.0/libxul.so)
    /usr/lib/./xulrunner-2.0/libxul.so: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/./xulrunner-2.0/libxul.so)
    /usr/lib/./libwpd-0.9.so.9.0.4: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/./libwpd-0.9.so.9.0.4)
    /usr/lib/./libdigikamdatabase.so.2.0.0: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/./libdigikamdatabase.so.2.0.0)
    /usr/lib/./libwpg-0.2.so.2.0.1: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib64/libwpd-0.9.so.9)
    /usr/lib/./libwpg-0.2.so.2.0.1: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib64/libwpd-stream-0.9.so.9)
    /usr/lib/./libMagick++.so.5.0.0: /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/./libMagick++.so.5.0.0)

(a emerge gcc:4.4 has already been completed at that point)

For me it looks like -- for example  /usr/lib/./libMagick++.so.5.0.0
-- still awaits the API introduced with gcc:4.5

I rebuild a lot of applications and library-containing package, but
there are some which seems to resistant against my attempts to solve
their problems via recompiling them with gcc-4.4.5

In general I did for example  

    sudo emerge /usr/lib/./libMagick++.so.5.0.0

but the next find/grep-combo still reports it as broken.

The settings are:
solfire:/home/user>gcc-config -l
 [1] x86_64-pc-linux-gnu-4.4.5 *
 [2] x86_64-pc-linux-gnu-4.5.3

Either I misunderstood the context complete or.... I misunderstand
completly.

Any ideas, whats going on here?

Best regards,
mcc