add python script to track warnings

warn.py

@@ -0,0 +1,47 @@
+import re
+import sys
+import operator
+from subprocess import check_output, STDOUT, CalledProcessError
+
+def process_output(command_output):
+    warnings = {}
+    regex = r"(.*):\swarning:\s(.*)"
+    lines = command_output.split("\n")
+    for line in lines[:-3]:
+        matches = re.finditer(regex, line)
+        for matchNum, match in enumerate(matches):
+            try:
+                warnings[match.group()] +=1
+            except KeyError:
+                warnings[match.group()] =1
+    time = lines[-3].split('\t')[1]
+    return time, warnings
+
+def generate_stats(warnings):
+    total_count = sum(warnings.values())
+    sorted_warnings = sorted(warnings.items(), key=operator.itemgetter(1), reverse=True)
+    return sorted_warnings, total_count
+
+def print_summary(time, warnings):
+    sorted_warnings, total_count = generate_stats(warnings)
+    print "START - Compilation warnings count"
+    print total_count
+    print "END - Compilation warnings count"
+    print 'START - Compilation warnings summary'
+    print 'Time taken to compile:', time
+    print 'Total number of warnings:', total_count, '\n'
+    print 'Given below is the list of unique warnings and the number of occurences of that warning'
+    for warning, count in sorted_warnings:
+        print count, ': ', warning
+    print 'END - Compilation warnings summary'
+
+try:
+    check_output(['make','clean'], stderr=STDOUT, shell=True)
+    command_output = check_output(['time','make','-j8'], stderr=STDOUT, shell=True)
+    time, warnings = process_output(command_output)
+    print_summary(time, warnings)
+except CalledProcessError as ex:
+    if ex.returncode > 1:
+        print 'Compilation failed'
+        print ex.output
+        sys.exit(ex.returncode)