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How to cross build libgcc1?

I am wondering how to cross build libgcc1 in a bootstrap setting. The
obvious answer is "cross build gcc-4.9". Looking at its Build-Depends
this means that I first need to build gmp to satisfy the dependency on
libgmp-dev. Let us assume that this just works. Now libgmp-dev depends
on libgmpxx4ldbl and libgmpxx4ldbl depends on libgcc1. Oops. We have a
loop. So the obvious answer is wrong. What is the non-obvious answer?


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