def compile(pathnames, out, err=sys.stderr, externals=None):
from spike.compiler.scheck import check, declareBuiltIn, declareExternalSymbols
from spike.compiler.symbols import SymbolTable
from spike.compiler.cgen import generateCode
from spike.compiler.statements import Compound, PragmaSource
notifier = Notifier(stream=err)
st = SymbolTable()
declareBuiltIn(st, notifier)
if externals:
declareExternalSymbols(externals, st, notifier)
tree = Compound()
for pathname in pathnames:
t = parse(pathname, notifier)
if t is None:
continue
tree.append(PragmaSource(pathname))
tree.extend(t)
check(tree, st, notifier)
notifier.failOnError()
generateCode(tree, out)
return
