sysgen: Terminate build when error detected

System generator now terminates with a non-zero exit code when
it detects an error, allowing the build system to detect the failure
and terminate the build.

Note: Sysgen only detects invalid keywords at this time. It would be
nice if it also detected other syntax and semantic errors.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>

scripts/sysgen.py

@@ -136,6 +136,16 @@ def write_file(filename, contents):
     f.close()
 
 
+#
+# ERROR HANDLING
+#
+
+
+def sysgen_error(msg):
+    print "\n*** sysgen error: " + msg + "\n"
+    sys.exit(1)
+
+
 #
 # CREATE INTERNAL REPRESENTATION OF SYSTEM
 #
@@ -227,8 +237,8 @@ def vpf_parse():
             driver_list.append(line[start_quote + 1:end_quote])
             continue
 
-        print "UNRECOGNIZED INPUT LINE"
-        print words     # display any unrecognized line
+        sysgen_error("unrecognized keyword %s on following line\n%s" %
+                     (words[0], line))
 
 
 #