modulehashes := ldr.CreateSymForUpdate("go:link.abihashes", 0)
		modulehashes.SetLocal(true)
		modulehashes.SetType(sym.SRODATA)

		for i, shlib := range ctxt.Shlibs {
			// modulehashes[i].modulename
			modulename := filepath.Base(shlib.Path)
			addgostring(ctxt, ldr, modulehashes, fmt.Sprintf("go:link.libname.%d", i), modulename)

			// modulehashes[i].linktimehash

		throw("minpc or maxpc invalid")
	}

	for _, modulehash := range datap.modulehashes {
		if modulehash.linktimehash != *modulehash.runtimehash {
			println("abi mismatch detected between", datap.modulename, "and", modulehash.modulename)
			throw("abi mismatch")
		}
	}
}

// questions based on the index file's data.
type Module struct {
	modroot string
	d       *decoder
	n       int // number of packages
}

// moduleHash returns an ActionID corresponding to the state of the module
// located at filesystem path modroot.
func moduleHash(modroot string, ismodcache bool) (cache.ActionID, error) {
	// We expect modules stored within the module cache to be checksummed and