It's just too bad that we'll lose the performance gained from the
fact that GCC's CPP is linked into the C compiler binary and thus
doesn't have to transfer it's result over a pipe or anything like
that.
I really think this whole idea isn't a very smart one. I would
rather have whoever would be working on a sparse backend instead
be working on kernel improvements.
I also think people underestimate how much work this would be.
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