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SubjectRe: Linux 2.2.20-pre4
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> IMHO omitting -fno-builtin when compiling the kernel was always a risky
> proposition... Since we provide our own copies of many of the builtins
> [which are used in the kernel] anyway... why not always -fno-builtin,
> and then call __builtin_foo when we really want the compiler's version..

That may well be the right thing to do. Of course we rely on the compiler
providing some of them too

> gcc 3.0 without -fno-builtin is perfectly allowed to assume it can
> insert calls to memcpy..

I have no argument about its correctness there, but -fno-builtin will still
give a kernel that dosnt link due to abs() and other problems.. 8)

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