Improve Python 3 compatibility of build scripts

These changes allow more of Chromium to be built using Python 3.

The scripts still work with Python 2.
There are no intended behaviour changes.

Bug: 941669
Change-Id: I6897d00ce00ec6aa5d7ca216b9f302e725a21897
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1527522
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Raul Tambre <raul@tambre.ee>
Cr-Commit-Position: refs/heads/master@{#642401}

build/toolchain/win/rc/rc.py

@@ -141,12 +141,7 @@ def Preprocess(rc_file_data, flags):
   # lines in the file except the preprocessor directives."""
   # Thankfully, the Microsoft headers are mostly good about putting everything
   # in the system headers behind `if !defined(RC_INVOKED)`, so regular
-  # preprocessing with RC_INVOKED defined almost works. The one exception
-  # is struct tagCRGB in dlgs.h, but that will be fixed in the next major
-  # SDK release too.
-  # TODO(thakis): Remove this once an SDK with the fix has been released.
-  preprocessed_output = re.sub('typedef struct tagCRGB\s*{[^}]*} CRGB;', '',
-                               preprocessed_output)
+  # preprocessing with RC_INVOKED defined works.
   return preprocessed_output
 
 

build/toolchain/win/tool_wrapper.py

@@ -8,6 +8,8 @@
 is used to set up calls to tools used by the build that need wrappers.
 """
 
+from __future__ import print_function
+
 import os
 import re
 import shutil
@@ -154,7 +156,7 @@ def ExecLinkWrapper(self, arch, use_separate_mspdbsrv, *args):
       if (not line.startswith('   Creating library ') and
           not line.startswith('Generating code') and
           not line.startswith('Finished generating code')):
-        print line,
+        print(line)
     result = link.wait()
     if result == 0 and sys.platform == 'win32':
       # Flush the file buffers to try to work around a Windows 10 kernel bug,
@@ -178,7 +180,7 @@ def ExecAsmWrapper(self, arch, *args):
     out, _ = popen.communicate()
     for line in out.splitlines():
       if not line.startswith(' Assembling: '):
-        print line
+        print(line)
     return popen.returncode
 
   def ExecRcWrapper(self, arch, *args):
@@ -207,11 +209,13 @@ def ExecRcWrapper(self, arch, *args):
     if rc_exe_exit_code == 0:
       # Since tool("rc") can't have deps, add deps on this script and on rc.py
       # and its deps here, so that rc edges become dirty if rc.py changes.
-      print 'Note: including file: ../../build/toolchain/win/tool_wrapper.py'
-      print 'Note: including file: ../../build/toolchain/win/rc/rc.py'
-      print 'Note: including file: ../../build/toolchain/win/rc/linux64/rc.sha1'
-      print 'Note: including file: ../../build/toolchain/win/rc/mac/rc.sha1'
-      print 'Note: including file: ../../build/toolchain/win/rc/win/rc.exe.sha1'
+      print('Note: including file: ../../build/toolchain/win/tool_wrapper.py')
+      print('Note: including file: ../../build/toolchain/win/rc/rc.py')
+      print(
+          'Note: including file: ../../build/toolchain/win/rc/linux64/rc.sha1')
+      print('Note: including file: ../../build/toolchain/win/rc/mac/rc.sha1')
+      print(
+          'Note: including file: ../../build/toolchain/win/rc/win/rc.exe.sha1')
 
     # 2. Run Microsoft rc.exe.
     if sys.platform == 'win32' and rc_exe_exit_code == 0:

build/win/copy_cdb_to_output.py

@@ -3,6 +3,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+from __future__ import print_function
+
 import glob
 import hashlib
 import os
@@ -38,7 +40,7 @@ def _CopyImpl(file_name, target_dir, source_dir, verbose=False):
       ((not os.path.isfile(target)) or
        _HexDigest(source) != _HexDigest(target))):
     if verbose:
-      print 'Copying %s to %s...' % (source, target)
+      print('Copying %s to %s...' % (source, target))
     if os.path.exists(target):
       os.unlink(target)
     shutil.copy(source, target)
@@ -69,7 +71,7 @@ def _CopyCDBToOutput(output_dir, target_arch):
   elif target_arch in ['x64', 'arm64']:
     src_arch = target_arch
   else:
-    print 'copy_cdb_to_output.py: unknown target_arch %s' % target_arch
+    print('copy_cdb_to_output.py: unknown target_arch %s' % target_arch)
     sys.exit(1)
   # We need to copy multiple files, so cache the computed source directory.
   src_dir = os.path.join(win_sdk_dir, 'Debuggers', src_arch)
@@ -109,8 +111,8 @@ def _CopyCDBToOutput(output_dir, target_arch):
 
 def main():
   if len(sys.argv) < 2:
-    print >>sys.stderr, 'Usage: copy_cdb_to_output.py <output_dir> ' + \
-        '<target_arch>'
+    print('Usage: copy_cdb_to_output.py <output_dir> ' + \
+        '<target_arch>', file=sys.stderr)
     return 1
   return _CopyCDBToOutput(sys.argv[1], sys.argv[2])
 

build/win/message_compiler.py

@@ -6,6 +6,8 @@
 #
 # Usage: message_compiler.py <environment_file> [<args to mc.exe>*]
 
+from __future__ import print_function
+
 import difflib
 import distutils.dir_util
 import filecmp
@@ -65,7 +67,7 @@ def main():
     # we use the 2017 Fall Creator's Update by default.
     mc_help = subprocess.check_output(['mc.exe', '/?'], env=env_dict,
                                       stderr=subprocess.STDOUT, shell=True)
-    version = re.search(r'Message Compiler\s+Version (\S+)', mc_help).group(1)
+    version = re.search(b'Message Compiler\s+Version (\S+)', mc_help).group(1)
     if version != '10.0.15063':
       return
 
@@ -122,20 +124,21 @@ def main():
     # in tmp_dir to the checked-in outputs.
     diff = filecmp.dircmp(tmp_dir, source)
     if diff.diff_files or set(diff.left_list) != set(diff.right_list):
-      print 'mc.exe output different from files in %s, see %s' % (source,
-                                                                  tmp_dir)
+      print('mc.exe output different from files in %s, see %s' % (source,
+                                                                  tmp_dir))
       diff.report()
       for f in diff.diff_files:
         if f.endswith('.bin'): continue
         fromfile = os.path.join(source, f)
         tofile = os.path.join(tmp_dir, f)
-        print ''.join(difflib.unified_diff(open(fromfile, 'U').readlines(),
-                                           open(tofile, 'U').readlines(),
-                                           fromfile, tofile))
+        print(''.join(
+            difflib.unified_diff(
+                open(fromfile, 'U').readlines(),
+                open(tofile, 'U').readlines(), fromfile, tofile)))
       delete_tmp_dir = False
       sys.exit(1)
   except subprocess.CalledProcessError as e:
-    print e.output
+    print(e.output)
     sys.exit(e.returncode)
   finally:
     if os.path.exists(tmp_dir) and delete_tmp_dir: