1 files changed, 68 insertions, 0 deletions
diff --git a/attoconf/lib/arches.py b/attoconf/lib/arches.py
new file mode 100644
index 0000000..bafef38
--- /dev/null
+++ b/attoconf/lib/arches.py
@@ -0,0 +1,68 @@
+#   Copyright 2013 Ben Longbons <b.r.longbons@gmail.com>
+#
+#   This file is part of attoconf.
+#
+#   attoconf is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   attoconf is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with attoconf.  If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import print_function, division, absolute_import
+
+from ..classy import ClassyProject
+
+def triple(s):
+    # Triples do not, in fact, follow a regular pattern.
+    # Some have only two segments, some appear to have four ...
+    # Also, sometimes a wrong thing is used as a triple.
+    # All we *really* care about is generating the tool names.
+    if s.startswith('-') or s.endswith('-') or '-' not in s[1:-1]:
+        raise ValueError('Probably not a triple')
+    return s
+
+def host(build, HOST):
+    if HOST is None:
+        BUILD, origin = build.vars['BUILD']
+        if origin != 'default':
+            origin = 'derived from BUILD'
+        build.vars['HOST'] = (BUILD, origin)
+
+def target(build, TARGET):
+    if TARGET is None:
+        HOST, origin = build.vars['HOST']
+        if origin != 'default':
+            origin = 'derived from HOST'
+        build.vars['TARGET'] = (HOST, origin)
+
+class Arches2(ClassyProject):
+    __slots__ = ()
+
+    def arches(self):
+        super(Arches2, self).arches()
+        self.add_help('System types:', hidden=False)
+        self.add_option('--build', init=None,
+                type=triple, check=None,
+                help='configure for building on BUILD', hidden=False,
+                help_def='native')
+        self.add_option('--host', init=None,
+                type=triple, check=host,
+                help='cross-compile to build programs to run on HOST',
+                hidden=False, help_def='BUILD')
+
+# TODO figure out the mro implications when I use this
+class Arches3(Arches2):
+    __slots__ = ()
+    def arches(self):
+        super(Arches3, self).arches()
+        self.add_option('--target', init=None,
+                type=triple, check=target,
+                help='configure for building compilers for TARGET',
+                hidden=False, help_def='HOST')