cq: Clean host dir before building with ASAN

Since adding TEST_ASAN=y doesn't change the output directory, it will
reuse existing .obj files that were not built with ASAN.

Delete build/host before running tests with ASAN.

Add -u option to python3 command to flush all print statements
immediately.

BRANCH=None
BUG=b:257393779
TEST=cq dry run

Change-Id: Ie0b636d49cc9382793b0a0d62111b13dadb34928
Signed-off-by: Jeremy Bettis <jbettis@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/4136960
Auto-Submit: Jeremy Bettis <jbettis@chromium.org>
Commit-Queue: Ting Shen <phoenixshen@chromium.org>
Reviewed-by: Ting Shen <phoenixshen@chromium.org>
Tested-by: Jeremy Bettis <jbettis@chromium.org>
Code-Coverage: Zoss <zoss-cl-coverage@prod.google.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/firmware_builder.py b/firmware_builder.py
index 8e0b8ef749..3b075a019a 100755
--- a/firmware_builder.py
+++ b/firmware_builder.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env -S python3 -u
 # -*- coding: utf-8 -*-
 # Copyright 2020 The ChromiumOS Authors
 # Use of this source code is governed by a BSD-style license that can be
@@ -13,6 +13,7 @@ import argparse
 import multiprocessing
 import os
 import pathlib
+import shutil
 import subprocess
 import sys
 
@@ -303,6 +304,12 @@ def test(opts):
         subprocess.run(cmd, cwd=os.path.dirname(__file__), check=True)
 
         # Verify the tests pass with ASan also
+        ec_dir = os.path.dirname(__file__)
+        build_dir = os.path.join(ec_dir, "build")
+        host_dir = os.path.join(build_dir, "host")
+        print(f"# Deleting {host_dir}")
+        shutil.rmtree(host_dir)
+
         cmd = ["make", "TEST_ASAN=y", target, f"-j{opts.cpus}"]
         print(f"# Running {' '.join(cmd)}.")
         subprocess.run(cmd, cwd=os.path.dirname(__file__), check=True)