Clang toolchain on Linux: compress with XZ, include LLVM Gold plugin.

tools/clang/scripts/package.py

Index: tools/clang/scripts/package.py
diff --git a/tools/clang/scripts/package.py b/tools/clang/scripts/package.py
index be8498f527e123da01ccffcf952ea5472d8e1a9e..a44d49741381e3c7747291de76bca7d2a67709df 100755
--- a/tools/clang/scripts/package.py
+++ b/tools/clang/scripts/package.py
@@ -149,12 +149,13 @@ def main():
   elif sys.platform.startswith('linux'):
     # Copy only
     # lib/clang/*/lib/linux/libclang_rt.{[atm]san,san,ubsan,profile}-*.a ,
-    # but not dfsan.
+    # but not dfsan. Also, copy LLVM Gold plugin.
     want.extend(['lib/clang/*/lib/linux/*[atm]san*',
                  'lib/clang/*/lib/linux/*ubsan*',
                  'lib/clang/*/lib/linux/*libclang_rt.san*',
                  'lib/clang/*/lib/linux/*profile*',
                  'lib/clang/*/msan_blacklist.txt',
+                 'lib/LLVMgold.so',
                  ])
   elif sys.platform == 'win32':
     want.extend(['lib/clang/*/lib/windows/clang_rt.asan*.dll',
@@ -209,9 +210,19 @@ def main():
   tar_entries = ['bin', 'lib', 'buildlog.txt']
   if sys.platform == 'darwin':
     tar_entries += ['include']
-  with tarfile.open(pdir + '.tgz', 'w:gz') as tar:
+  tar_mode = 'w:gz'
+  tar_ext = '.tgz'
+  # On Linux, we use xz for compression that is about 35% more efficient
+  # than gzip on Clang toolchain archives.
+  if sys.platform.startswith('linux'):
+    tar_mode = 'w'
+    tar_ext = '.tar'
+  with tarfile.open(pdir + tar_ext, tar_mode) as tar:
     for entry in tar_entries:
       tar.add(os.path.join(pdir, entry), arcname=entry, filter=PrintTarProgress)
+  if sys.platform.startswith('linux'):
+    subprocess.call(['xz', '-z', '-9', pdir+tar_ext])
+    tar_ext = '.tar.xz'
 
   if sys.platform == 'darwin':
     platform = 'Mac'
@@ -221,8 +232,9 @@ def main():
     platform = 'Linux_x64'
 
   print 'To upload, run:'
-  print ('gsutil cp -a public-read %s.tgz '
-         'gs://chromium-browser-clang/%s/%s.tgz') % (pdir, platform, pdir)
+  print ('gsutil cp -a public-read %s%s '
+         'gs://chromium-browser-clang/%s/%s%s') %
+         (pdir, tar_ext, platform, pdir, tar_ext)
 
   # Zip up gold plugin on Linux.

[hans, 2015/10/05 20:53:57]

Bundling the plugin makes this code unnecessary.

   if sys.platform.startswith('linux'):