[NFC] Print build-script timings to stderr

Author: beccadax

utils/swift_build_support/swift_build_support/utils.py

@@ -75,11 +75,11 @@ def log_analyzer():
     Analyze .build_script_log and provide a summary of the time execution.
     """
     build_script_log_path = log_time_path()
-    print("--- Build Script Analyzer ---")
+    print("--- Build Script Analyzer ---", file=sys.stderr)
     build_events = []
     total_duration = 0
     if os.path.exists(build_script_log_path):
-        print("Build Script Log: {}".format(build_script_log_path))
+        print("Build Script Log: {}".format(build_script_log_path), file=sys.stderr)
         with open(build_script_log_path) as f:
             for event in f:
                 build_event = json.loads(event)
@@ -89,15 +89,17 @@ def log_analyzer():
         finish_events = [x for x in build_events if x["event"] == "end"]
         finish_events.sort(key=lambda x: x["duration"], reverse=True)
 
-        print("Build Percentage \t Build Duration (sec) \t Build Phase")
-        print("================ \t ==================== \t ===========")
+        print("Build Percentage \t Build Duration (sec) \t Build Phase",
+              file=sys.stderr)
+        print("================ \t ==================== \t ===========",
+              file=sys.stderr)
         event_row = '{:<17.1%} \t {:<21} \t {}'
         for build_event in finish_events:
             duration_percentage = \
                 (float(build_event["duration"]) / float(total_duration))
             print(event_row.format(duration_percentage,
                                    build_event["duration"],
-                                   build_event["command"]))
+                                   build_event["command"]), file=sys.stderr)
 
         hours, remainder = divmod(total_duration, 3600)
         minutes, seconds = divmod(remainder, 60)
@@ -111,7 +113,8 @@ def log_analyzer():
             formatted_duration = ""
 
         print("Total Duration: {:.2f} seconds".format(
-            total_duration) + formatted_duration)
+            total_duration) + formatted_duration, file=sys.stderr)
     else:
-        print("Skip build script analyzer")
-        print(".build_script_log file not found at {}".format(build_script_log_path))
+        print("Skip build script analyzer", file=sys.stderr)
+        print(".build_script_log file not found at {}".format(build_script_log_path),
+              file=sys.stderr)