Canandian Cross Compiling and RTEMS 3rd party package building Fixes.

The change fixes installing for RTEMS 3rd Party packages where the
RSB considered them Canadian Cross Compiling (Cxc). Fixing the
Cxc issue broke real Cxc builds. The change corrects the issue of
macros being changed in the Cxc and the prep data not being udpated.
The configuration is loaded again after the updated macros. The
macros are also copied and restored to ensure a clean stable base.

The change also introduces --rtems-tools and --rtems-bsp to align
the command line with the waf configure process or RTEMS application.

source-builder/sb/options.py

@@ -221,6 +221,9 @@ class command_line:
         print '--libstdcxxflags flags : List of C++ flags to build the target libstdc++ code'
         print '--with-<label>         : Add the --with-<label> to the build'
         print '--without-<label>      : Add the --without-<label> to the build'
+        print '--rtems-tools path     : Path to an install RTEMS tool set'
+        print '--rtems-bsp arc/bsp    : Standard RTEMS architecure and BSP specifier'
+        print '--rtems-version ver    : The RTEMS major/minor version string'
         if self.optargs:
             for a in self.optargs:
                 print '%-22s : %s' % (a, self.optargs[a])
@@ -297,10 +300,6 @@ class command_line:
             rsb_macros = path.join(os.environ['HOME'], '.rsb_macros')
             if path.exists(rsb_macros):
                 self.defaults.load(rsb_macros)
-        # If a Cxc build disable installing.
-        if self.canadian_cross():
-            self.opts['no-install'] = '1'
-            self.defaults['_no_install'] = '1'
 
     def sb_git(self):
         repo = git.repo(self.defaults.expand('%{_sbdir}'), self)
@@ -450,7 +449,7 @@ class command_line:
 
     def get_arg(self, arg):
         if self.optargs is None or arg not in self.optargs:
-            raise error.internal('bad arg: %s' % (arg))
+            return None
         return self.parse_args(arg)
 
     def with_arg(self, label):
@@ -516,6 +515,9 @@ class command_line:
     def download_disabled(self):
         return self.opts['no-download'] != '0'
 
+    def disable_install(self):
+        self.opts['no-install'] = '1'
+
     def info(self):
         s = ' Command Line: %s%s' % (' '.join(self.argv), os.linesep)
         s += ' Python: %s' % (sys.version.replace('\n', ''))
@@ -524,6 +526,28 @@ class command_line:
     def log_info(self):
         log.output(self.info())
 
+    def rtems_options(self):
+        # Check for RTEMS specific helper options.
+        rtems_tools = self.parse_args('--rtems-tools')
+        if rtems_tools is not None:
+            if self.get_arg('--with-tools') is not None:
+                raise error.general('--rtems-tools and --with-tools cannot be used together')
+            self.args.append('--with-tools=%s' % (rtems_tools[1]))
+        rtems_arch_bsp = self.parse_args('--rtems-bsp')
+        if rtems_arch_bsp is not None:
+            if self.get_arg('--target') is not None:
+                raise error.general('--rtems-bsp and --target cannot be used together')
+            ab = rtems_arch_bsp[1].split('/')
+            if len(ab) != 2:
+                raise error.general('invalid --rtems-bsp option')
+            rtems_version = self.parse_args('--rtems-version')
+            if rtems_version is None:
+                rtems_version = '%d.%d' % (version.major, version.minor)
+            else:
+                rtems_version = rtems_version[1]
+            self.args.append('--target=%s-rtems%s' % (ab[0], rtems_version))
+            self.args.append('--with-rtems-bsp=%s' % (ab[1]))
+
 def load(args, optargs = None, defaults = '%{_sbdir}/defaults.mc'):
     """
     Copy the defaults, get the host specific values and merge them overriding
@@ -590,6 +614,7 @@ def load(args, optargs = None, defaults = '%{_sbdir}/defaults.mc'):
         o.defaults[k] = overrides[k]
 
     o.sb_git()
+    o.rtems_options()
     o.process()
     o.post_process()