rk: add gcc-wrapper

diff --git a/Makefile b/Makefile
index 90acf2f5a5730d00d2a351a5e0cf49d300b060a6..ba7c9ef70cc8011caf39eb3b55f36d83a7311cc6 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -346,6 +346,12 @@ DEPMOD             = /sbin/depmod
 PERL           = perl
 CHECK          = sparse
 
+# Use the wrapper for the compiler. This wrapper scans for new
+# warnings and causes the build to stop upon encountering them.
+ifneq ($(wildcard $(srctree)/scripts/gcc-wrapper.py),)
+CC             = $(srctree)/scripts/gcc-wrapper.py $(CROSS_COMPILE)gcc
+endif
+
 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
                  -Wbitwise -Wno-return-void $(CF)
 CFLAGS_MODULE   =

diff --git a/scripts/gcc-wrapper.py b/scripts/gcc-wrapper.py
new file mode 100755 (executable)
index 0000000..c43deed
--- /dev/null
+++ b/scripts/gcc-wrapper.py
@@ -0,0 +1,102 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+#       notice, this list of conditions and the following disclaimer in the
+#       documentation and/or other materials provided with the distribution.
+#     * Neither the name of The Linux Foundation nor
+#       the names of its contributors may be used to endorse or promote
+#       products derived from this software without specific prior written
+#       permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# 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([
+    "return_address.c:63",
+    "hid-appleir.c:347",
+    "hid-magicmouse.c:580",
+    "hid-ntrig.c:1026",
+    "core.c:1334",
+    "menu.c:129",
+    "bus.c:318", # FIXME
+ ])
+
+# 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)