scripts: snapshot of kernel build utility scripts

This is a snapshot of build scripts taken as of msm-4.19
commit <3fc21416733e696> (Merge "ARM: dts: msm: Add dpdm
regulator on kona").

Change-Id: I3a60f8563227de4e6f59d5abcca7c8edd2c8c12f
Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>

scripts/gcc-wrapper.py

@@ -0,0 +1,79 @@
+#! /usr/bin/env python2
+# SPDX-License-Identifier: GPL-2.0-only
+# Copyright (c) 2011-2017, 2018 The Linux Foundation. All rights reserved.
+
+# -*- coding: utf-8 -*-
+
+# Invoke gcc, looking for warnings, and causing a failure if there are
+# non-whitelisted warnings.
+
+import errno
+import re
+import os
+import sys
+import subprocess
+
+# Note that gcc uses unicode, which may depend on the locale.  TODO:
+# force LANG to be set to en_US.UTF-8 to get consistent warnings.
+
+allowed_warnings = set([
+    "umid.c:138",
+    "umid.c:213",
+    "umid.c:388",
+    "coresight-catu.h:116",
+    "mprotect.c:42",
+    "signal.c:93",
+    "signal.c:51",
+ ])
+
+# Capture the name of the object file, can find it.
+ofile = None
+
+warning_re = re.compile(r'''(.*/|)([^/]+\.[a-z]+:\d+):(\d+:)? warning:''')
+def interpret_warning(line):
+    """Decode the message from gcc.  The messages we care about have a filename, and a warning"""
+    line = line.rstrip('\n')
+    m = warning_re.match(line)
+    if m and m.group(2) not in allowed_warnings:
+        print "error, forbidden warning:", m.group(2)
+
+        # If there is a warning, remove any object if it exists.
+        if ofile:
+            try:
+                os.remove(ofile)
+            except OSError:
+                pass
+        sys.exit(1)
+
+def run_gcc():
+    args = sys.argv[1:]
+    # Look for -o
+    try:
+        i = args.index('-o')
+        global ofile
+        ofile = args[i+1]
+    except (ValueError, IndexError):
+        pass
+
+    compiler = sys.argv[0]
+
+    try:
+        proc = subprocess.Popen(args, stderr=subprocess.PIPE)
+        for line in proc.stderr:
+            print line,
+            interpret_warning(line)
+
+        result = proc.wait()
+    except OSError as e:
+        result = e.errno
+        if result == errno.ENOENT:
+            print args[0] + ':',e.strerror
+            print 'Is your PATH set correctly?'
+        else:
+            print ' '.join(args), str(e)
+
+    return result
+
+if __name__ == '__main__':
+    status = run_gcc()
+    sys.exit(status)