rtemstoolkit: Move host support access into a separate module.

Moving the host support into a module lets it get used where options
is not being used.

rtemstoolkit/host.py

@@ -0,0 +1,111 @@
+#
+# RTEMS Tools Project (http://www.rtems.org/)
+# Copyright 2017 Chris Johns (chrisj@rtems.org)
+# All rights reserved.
+#
+# This file is part of the RTEMS Tools package in 'rtems-tools'.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+# this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice,
+# this list of conditions and the following disclaimer in the documentation
+# and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+#
+# Host specifics.
+#
+
+from __future__ import print_function
+
+import os
+
+#
+# Support to handle use in a package and as a unit test.
+# If there is a better way to let us know.
+#
+try:
+    from . import error
+except (ValueError, SystemError):
+    import error
+
+is_windows = False
+platform = None
+name = None
+
+def _load():
+
+    global is_windows
+    global platform
+    global name
+
+    if os.name == 'nt':
+        name = 'windows'
+        is_windows = True
+    elif os.name == 'posix':
+        uname = os.uname()
+        if uname[0].startswith('CYGWIN_NT'):
+            name = 'windows'
+        elif uname[0] == 'Darwin':
+            name = darwin
+        elif uname[0] == 'FreeBSD':
+            name = 'freebsd'
+        elif uname[0] == 'NetBSD':
+            name = netbsd
+        elif uname[0] == 'Linux':
+            name = 'linux'
+        elif uname[0] == 'SunOS':
+            name = 'solaris'
+
+    if name is None:
+        raise error.general('unsupported host type; please add')
+
+    #try:
+    #    try:
+    #        platform = __import__(name, globals(), locals(), ['.'])
+    #    except:
+    #        platform = __import__(name, globals(), locals())
+    #except:
+    #    raise error.general('failed to load %s host support' % (name))
+
+    platform = __import__(name, globals(), locals(), ['.', ''])
+
+    if platform is None:
+        raise error.general('failed to load %s host support' % (name))
+
+def cpus():
+    _load()
+    return platform.cpus()
+
+def overrides():
+    _load()
+    return platform.overrides()
+
+if __name__ == '__main__':
+    import pprint
+    _load()
+    print('Name      : %s' % (name))
+    if is_windows:
+        status = 'Yes'
+    else:
+        status = 'No'
+    print('Windows   : %s' % (status))
+    print('CPUs      : %d' % (cpus()))
+    print('Overrides :')
+    pprint.pprint(overrides())