Someone broke bootstrap

[John David Anglin]

> I'm seeing this on frv too. I blame Zack (at least in the little bit of
> looking I did...), but that's ok. I'm sure he'll fix it.

Yes, it looks as if this is caused by one of Zack's recent changes.
We have:

#0  0x400000000035ee3c in copy_rtx (orig=0x0) at ../../gcc/gcc/rtl.c:377
#1  0x40000000002f869c in emit_libcall_block (insns=0x800003fffed1f550, 
    target=0x800003fffed20600, result=0x800003fffed1f2d0, equiv=0x0)
    at ../../gcc/gcc/optabs.c:3397
#2  0x40000000002f9430 in emit_cmp_and_jump_insns (x=0x800003fffed3bfa0, 
    y=0x800003fffeff2768, comparison=NE, size=0x72, mode=TFmode, unsignedp=0, 
    label=0x800003fffed3bf50) at ../../gcc/gcc/optabs.c:3946

emit_libcall_block is called with equiv=0 when optimize is 0.  We end
up trying to copy a NULL_RTX at optabs.c:3397.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6602)