{
  'x86':    ['i386', 'i486', 'i586', 'i686'],
  'x86_64': ['AMD64', 'amd64', 'em64t', 'EM64T', 'x86_64'],
  'ia64':   ['IA64']
}

# Dict to 'canonalize' the arch
_ARCH_TO_CANONICAL = {
    "amd64"     : "amd64",
    "emt64"     : "amd64",
    "i386"      : "x86",
    "i486"      : "x86",
    "i586"      : "x86",
    "i686"      : "x86",
    "ia64"      : "ia64",
    "itanium"   : "ia64",
    "x86"       : "x86",
    "x86_64"    : "amd64",
}

# Given a (host, target) tuple, return the argument for the bat file. Both host
# and targets should be canonalized.
_HOST_TARGET_ARCH_TO_BAT_ARCH = {
    ("x86", "x86"): "x86",
    ("x86", "amd64"): "x86_amd64",
    ("amd64", "amd64"): "amd64",
    ("amd64", "x86"): "x86",
    ("x86", "ia64"): "x86_ia64"
}