The bootstrap problem could be resolved by ensuring that GCC version N-1 could always build GCC version N, and that they could link statically against libstdc++. GCC version N-1 must be linked against libstdc++ N-1 while it is building GCC N and libstdc++ N; GCC N, in turn, will need libstdc++ N. Static linking ensures that each version of the compiler runs with the appropriate version of the library.

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