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compiling amd64-kernel fails (w/o cgd)


after cvs-updating -current an hour or so ago, compiling a new
(custonized) kernel fails like so:

making sure the kern library is up to date...
`libkern.o' is up to date.
     create  vers.c
    compile  vNBx64/vers.o
       link  vNBx64/netbsd
/u/NetBSD/arch/amd64/TOOLS/bin/x86_64--netbsd-ld: identcpu.o: in function `cpu_probe':
/u/NetBSD/src/sys/arch/x86/x86/identcpu.c:1024: undefined reference to `chacha_sse2_impl'
/u/NetBSD/arch/amd64/TOOLS/bin/x86_64--netbsd-ld: /u/NetBSD/src/sys/arch/x86/x86/identcpu.c:1024: undefined reference to `chacha_md_init'
--- netbsd ---
*** [netbsd] Error code 1

nbmake: stopped in /u/NetBSD/arch/amd64/obj/sys/arch/amd64/compile/vNBx64
1 error

If I add "pseudo-device        cgd" to my configuration,
compiling a new kernel works fine again.

Is there a technical reason for chacha & co depending on cgd?
And is it documented somewhere? ;-)


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