possible bug with libstdc++ in gcc4.3 20080215 linked to old user /usr/lib/libgcc_s.1.dylib

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possible bug with libstdc++ in gcc4.3 20080215 ...
\ George Nurser (24 Feb 2008)

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Subject:	possible bug with libstdc++ in gcc4.3 20080215 linked to old user /usr/lib/libgcc_s.1.dylib
Group:	Gcc
From:	George Nurser
Date:	24 Feb 2008

I installed gcc4.3 20080215 on os x10.5.2 using macports

The configure arguments (with prefix = /opt/local) are:
47 configure.args --enable-languages=c,c++,objc,obj-c++ \
48 --libdir=${prefix}/lib/${name} \
49 --includedir=${prefix}/include/${name} \
50 --infodir=${prefix}/share/info \
51 --mandir=${prefix}/share/man \
52 --with-local-prefix=${prefix} \
53 --with-system-zlib \
54 --disable-nls \
55 --program-suffix=-mp-${major} \
56 --with-gxx-include-dir=${prefix}/include/${name}/c++/ \
57 --with-gmp=${prefix} \
58 --with-mpfr=${prefix}

% otool -L /opt/local/lib/gcc43/libstdc++.6.dylib
gives:

/opt/local/lib/gcc43/libstdc++.6.dylib:
/opt/local/lib/gcc43/libstdc++.6.dylib (compatibility version 7.0.0,
current version 7.10.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
version 111.0.0)
/usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)

So /opt/local/lib/gcc43/libstdc++.6.dylib is linked to the old, system
/usr/lib/libgcc_s.1.dylib instead of to the new
/opt/local/lib/gcc43/libgcc_s.1.dylib

Is this the correct behaviour?