clang: add an option to update.sh to pull lldb as well

tools/clang/scripts/update.sh

 #!/bin/bash
 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This script will check out llvm and clang into third_party/llvm and build it.
 
 THIS_DIR="$(dirname "${0}")"
 LLVM_DIR="${THIS_DIR}/../../../third_party/llvm"
 LLVM_BUILD_DIR="${LLVM_DIR}/../llvm-build"
 CLANG_DIR="${LLVM_DIR}/tools/clang"
+LLDB_DIR="${LLVM_DIR}/tools/lldb"
 DEPS_FILE="${THIS_DIR}/../../../DEPS"
 STAMP_FILE="${LLVM_BUILD_DIR}/cr_build_revision"
 
 # ${A:-a} returns $A if it's set, a else.
 LLVM_REPO_URL=${LLVM_URL:-http://llvm.org/svn/llvm-project}
 
 # Die if any command dies.
 set -e
 
+# Parse command line options.
+use_lldb=
+while [[ $# > 0 ]]; do
+  case $1 in
+    --lldb)
+      use_lldb=yes
+      ;;
+    --help)
+      echo "usage: $0 [--lldb]"
+      echo "If --lldb is passed, check out lldb as well."
+      echo "(Once lldb is checked out once, it will implicitly be updated and"
+      echo "built on further updates.)"
+      exit 1
+      ;;
+  esac
+  shift
+done
+
 # Since people need to run this script anyway to compile clang, let it check out
 # clang as well if it's not in DEPS, so that people don't have to change their
 # DEPS if they just want to give clang a try.
 CLANG_REVISION=$(grep 'clang_revision":' "${DEPS_FILE}" | egrep -o [[:digit:]]+)
 
 # Check if there's anything to be done, exit early if not.
 if [ -f "${STAMP_FILE}" ]; then
   PREVIOUSLY_BUILT_REVISON=$(cat "${STAMP_FILE}")
   if [ "${PREVIOUSLY_BUILT_REVISON}" = "${CLANG_REVISION}" ]; then
     echo "Clang already at ${CLANG_REVISION}"
@@ skipping 10 matching lines @@
   svn co --force "${LLVM_REPO_URL}/llvm/trunk@${CLANG_REVISION}" "${LLVM_DIR}"
 fi
 
 if grep -q 'src/third_party/llvm/tools/clang":' "${DEPS_FILE}"; then
   echo clang pulled in through DEPS, skipping clang update step
 else
   echo Getting clang r"${CLANG_REVISION}" in "${CLANG_DIR}"
   svn co --force "${LLVM_REPO_URL}/cfe/trunk@${CLANG_REVISION}" "${CLANG_DIR}"
 fi
 
+# Update lldb either if the flag is passed or we have a previous checkout.
+if [ -n "$use_lldb" -o -d "${LLDB_DIR}" ]; then
+  if grep -q 'src/third_party/llvm/tools/lldb":' "${DEPS_FILE}"; then
+    echo lldb pulled in through DEPS, skipping lldb update step
+  else
+    echo Getting lldb r"${CLANG_REVISION}" in "${LLDB_DIR}"
+    svn co --force "${LLVM_REPO_URL}/lldb/trunk@${CLANG_REVISION}" "${LLDB_DIR}"
+  fi
+fi
+
 # Echo all commands.
 set -x
 
 # Build clang (in a separate directory).
 # The clang bots have this path hardcoded in built/scripts/slave/compile.py,
 # so if you change it you also need to change these links.
 mkdir -p "${LLVM_BUILD_DIR}"
 cd "${LLVM_BUILD_DIR}"
 if [ ! -f ./config.status ]; then
   ../llvm/configure \
@@ skipping 19 matching lines @@
 PLUGIN_BUILD_DIR="${LLVM_BUILD_DIR}/tools/clang/tools/chrome-plugin"
 rm -rf "${PLUGIN_DST_DIR}"
 cp -R "${PLUGIN_SRC_DIR}" "${PLUGIN_DST_DIR}"
 rm -rf "${PLUGIN_BUILD_DIR}"
 mkdir -p "${PLUGIN_BUILD_DIR}"
 cp "${PLUGIN_SRC_DIR}/Makefile" "${PLUGIN_BUILD_DIR}"
 make -j"${NUM_JOBS}" -C "${PLUGIN_BUILD_DIR}"
 
 # After everything is done, log success for this revision.
 echo "${CLANG_REVISION}" > "${STAMP_FILE}"