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

tools/clang/scripts/update.sh

Index: tools/clang/scripts/update.sh
diff --git a/tools/clang/scripts/update.sh b/tools/clang/scripts/update.sh
index 36b6e81eae7f3c4457b394dc5ab81b43c96b6e1d..8098e2e2c05e46eda17458a5a943afa09eed3a01 100755
--- a/tools/clang/scripts/update.sh
+++ b/tools/clang/scripts/update.sh
@@ -245,13 +245,14 @@ rm -f "${STAMP_FILE}"
 if [[ -z "$force_local_build" ]]; then
   # Check if there's a prebuilt binary and if so just fetch that. That's faster,
   # and goma relies on having matching binary hashes on client and server too.
-  CDS_FILE="clang-${PACKAGE_VERSION}.tgz"
+  CDS_FILE="clang-${PACKAGE_VERSION}"
   CDS_OUT_DIR=$(mktemp -d -t clang_download.XXXXXX)
-  CDS_OUTPUT="${CDS_OUT_DIR}/${CDS_FILE}"
+  CDS_OUTPUT="${CDS_OUT_DIR}/${CDS_FILE}.tgz"
   if [ "${OS}" = "Linux" ]; then
-    CDS_FULL_URL="${CDS_URL}/Linux_x64/${CDS_FILE}"
+    CDS_OUTPUT="${CDS_OUT_DIR}/${CDS_FILE}.tar.xz"
+    CDS_FULL_URL="${CDS_URL}/Linux_x64/${CDS_FILE}.tar.xz"
   elif [ "${OS}" = "Darwin" ]; then
-    CDS_FULL_URL="${CDS_URL}/Mac/${CDS_FILE}"
+    CDS_FULL_URL="${CDS_URL}/Mac/${CDS_FILE}.tgz"
   fi
   echo Trying to download prebuilt clang
   if which curl > /dev/null; then
@@ -266,7 +267,11 @@ if [[ -z "$force_local_build" ]]; then
   if [ -f "${CDS_OUTPUT}" ]; then
     rm -rf "${LLVM_BUILD_DIR}"
     mkdir -p "${LLVM_BUILD_DIR}"
-    tar -xzf "${CDS_OUTPUT}" -C "${LLVM_BUILD_DIR}"
+    if [ "${OS}" = "Linux"]; then
+      unxz < "${CDS_OUTPUT}" | tar -x -C "${LLVM_BUILD_DIR}"

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

Maybe just use tar's -J option?

+    else
+      tar -xzf "${CDS_OUTPUT}" -C "${LLVM_BUILD_DIR}"
+    fi
     echo clang "${PACKAGE_VERSION}" unpacked
     echo "${PACKAGE_VERSION}" > "${STAMP_FILE}"
     rm -rf "${CDS_OUT_DIR}"