[build-script] Bring in modernizations from downstream:

- Don't do any checks of the current SCM repository if the
  llvm repositories are already there.  Useful for bots.
- When symlinking, remove old symlinks.
- Support loading build-script as a library, not necessarily
  under Xcode.
- Stringify args before passing them to subprocess.

llvm-svn: 309631

1 files changed, 7 insertions, 2 deletions

diff --git a/lldb/scripts/Xcode/lldbbuild.py b/lldb/scripts/Xcode/lldbbuild.py
index 8496cfabf3d..e70fe1bf803 100644
--- a/lldb/scripts/Xcode/lldbbuild.py
+++ b/lldb/scripts/Xcode/lldbbuild.py
@@ -1,5 +1,6 @@
 import os
 import subprocess
+import sys
 
 #### UTILITIES ####
 
@@ -14,7 +15,11 @@ def enum(*sequential, **named):
 
 
 def lldb_source_path():
-    return os.environ.get('SRCROOT')
+    path = os.environ.get('SRCROOT')
+    if path:
+         return path
+    else:
+         return "./"
 
 
 def expected_llvm_build_path():
@@ -80,7 +85,7 @@ VCS = enum('git',
 
 
 def run_in_directory(args, path):
-    return subprocess.check_output(args, cwd=path)
+    return subprocess.check_output([str(arg) for arg in args], cwd=path)
 
 
 class Git: