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I read this to mean it's entirely uninteresting what kind of error there was. And I've meanwhile figured that the specific error here, which presumably most targets get to see (x86 does), disappeared for targets setting TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to zero. This is because that error would only be seen if S_GET_VALUE() in cvt_frag_to_fill()'s processing of rs_leb128 runs with finalize_syms already set to 1; the same expression wouldn't be evaluated another time later anymore (and hence the error has no chance of surfacing). I have to admit that I find this quite strange. But I could also see this being an interaction between leb128 processing (which has some further anomalies anyway) and TC_FINALIZE_SYMS_BEFORE_SIZE_SEG == 0 which so far simply has been overlooked. Jan