Clang toolchain: checkout LLD on all platforms but Darwin.

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 17181098f97a3d2f08f462710a3e213e68c80727..1e570cab3590998441056c446896bc73e9cfa765 100755
--- a/tools/clang/scripts/package.py
+++ b/tools/clang/scripts/package.py
@@ -221,6 +221,9 @@ def main():
   elif sys.platform.startswith('linux'):
     # Copy the libstdc++.so.6 we linked Clang against so it can run.
     want.append('lib/libstdc++.so.6')
+    # Add llvm-ar and lld for LTO.
+    want.append('bin/llvm-ar')

[Nico, 2017/02/08 20:02:00]

do we need this? on windows we run `lld-link /lib` to get ar iirc

[krasin1, 2017/02/08 20:36:41]

yes, we do. Right now, when we do an LTO build, ar is running with LLVMgold.so
as a plugin. I have tested that llvm-ar can do the job, but it seems to be the
only way to get rid of LLVMgold.so.

+    want.append('bin/lld')
     # Copy only
     # lib/clang/*/lib/linux/libclang_rt.{[atm]san,san,ubsan,profile}-*.a ,
     # but not dfsan.
@@ -261,6 +264,9 @@ def main():
     os.symlink('clang', os.path.join(pdir, 'bin', 'clang++'))
     os.symlink('clang', os.path.join(pdir, 'bin', 'clang-cl'))
 
+  if sys.platform.startswith('linux'):
+    os.symlink('lld', os.path.join(pdir, 'bin', 'ld.lld'))
+
   # Copy libc++ headers.
   if sys.platform == 'darwin':
     shutil.copytree(os.path.join(LLVM_BOOTSTRAP_INSTALL_DIR, 'include', 'c++'),