http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47430

--- Comment #2 from Benjamin Kosnik <bkoz at gcc dot gnu.org> 2011-01-24 
18:53:14 UTC ---

4) is not possible, as stdc++.h is included in precompiled/stdtr1c++.h and the
extension PCH. (ie, chained pches.) We don't want to re-order this, and build
stdtr1c++.h without stdc++.h, as then PCH file sizes for
stdtr1c++.h.gch/extc++.h.gch will balloon massively.

You can work around this with --disable-libstdcxx-pch at configure time for
PPC.

Long term solution IMHO is to make .gch files smaller.

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