if c := h.oldbuckets; c != nil {
		if !h.sameSizeGrow() {
			// There used to be half as many buckets; mask down one more power of two.
			m >>= 1
		}
		oldb := (*bmap)(add(c, (hash&m)*uintptr(t.BucketSize)))
		if !evacuated(oldb) {
			b = oldb
		}
	}
	top := tophash(hash)
	for ; b != nil; b = b.overflow(t) {
		for i, kptr := uintptr(0), b.keys(); i < abi.MapBucketCount; i, kptr = i+1, add(kptr, 2*goarch.PtrSize) {

		if c := h.oldbuckets; c != nil {
			if !h.sameSizeGrow() {
				// There used to be half as many buckets; mask down one more power of two.
				m >>= 1
			}
			oldb := (*bmap)(add(c, (hash&m)*uintptr(t.BucketSize)))
			if !evacuated(oldb) {
				b = oldb
			}
		}
	}
	for ; b != nil; b = b.overflow(t) {
		for i, k := uintptr(0), b.keys(); i < abi.MapBucketCount; i, k = i+1, add(k, 8) {

		if c := h.oldbuckets; c != nil {
			if !h.sameSizeGrow() {
				// There used to be half as many buckets; mask down one more power of two.
				m >>= 1
			}
			oldb := (*bmap)(add(c, (hash&m)*uintptr(t.BucketSize)))
			if !evacuated(oldb) {
				b = oldb
			}
		}
	}
	for ; b != nil; b = b.overflow(t) {
		for i, k := uintptr(0), b.keys(); i < abi.MapBucketCount; i, k = i+1, add(k, 4) {

		return dst
	}

	oldB := src.B
	srcOldbuckets := src.oldbuckets
	if !src.sameSizeGrow() {
		oldB--
	}
	oldSrcArraySize := int(bucketShift(oldB))

	for i := 0; i < oldSrcArraySize; i++ {
		srcBmap := (*bmap)(add(srcOldbuckets, uintptr(i*int(t.BucketSize))))
		if evacuated(srcBmap) {
			continue
		}

			return []string{"-m64"}
		}

	}
	return nil
}

var wantHdr = objabi.HeaderString()

// ldobj loads an input object. If it is a host object (an object
// compiled by a non-Go compiler) it returns the Hostobj pointer. If
// it is a Go object, it returns nil.
func ldobj(ctxt *Link, f *bio.Reader, lib *sym.Library, length int64, pn string, file string) *Hostobj {
	pkg := objabi.PathToPrefix(lib.Pkg)