script/update-clang.sh

   1 #!/usr/bin/env bash
   2 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
   3 # Use of this source code is governed by a BSD-style license that can be
   4 # found in the LICENSE file.
   5
   6 # This script will check out llvm and clang into third_party/llvm and build it.
   7
   8 # Do NOT CHANGE this if you don't know what you're doing -- see
   9 # https://code.google.com/p/chromium/wiki/UpdatingClang
  10 # Reverting problematic clang rolls is safe, though.
  11 CLANG_REVISION=284979
  12
  13 # This is incremented when pushing a new build of Clang at the same revision.
  14 CLANG_SUB_REVISION=1
  15
  16 PACKAGE_VERSION="${CLANG_REVISION}-${CLANG_SUB_REVISION}"
  17
  18 THIS_DIR="$(dirname "${0}")"
  19 LLVM_DIR="${THIS_DIR}/../vendor/llvm"
  20 LLVM_BUILD_DIR="${LLVM_DIR}/../llvm-build/Release+Asserts"
  21 STAMP_FILE="${LLVM_DIR}/../llvm-build/cr_build_revision"
  22
  23 # ${A:-a} returns $A if it's set, a else.
  24 LLVM_REPO_URL=${LLVM_URL:-https://llvm.org/svn/llvm-project}
  25
  26 CDS_URL=https://commondatastorage.googleapis.com/chromium-browser-clang
  27
  28
  29 # Die if any command dies, error on undefined variable expansions.
  30 set -eu
  31
  32
  33 OS="$(uname -s)"
  34
  35 # Check if there's anything to be done, exit early if not.
  36 if [[ -f "${STAMP_FILE}" ]]; then
  37   PREVIOUSLY_BUILT_REVISON=$(cat "${STAMP_FILE}")
  38   if [[ "${PREVIOUSLY_BUILT_REVISON}" = "${PACKAGE_VERSION}" ]]; then
  39     echo "Clang already at ${PACKAGE_VERSION}"
  40     exit 0
  41   fi
  42 fi
  43 # To always force a new build if someone interrupts their build half way.
  44 rm -f "${STAMP_FILE}"
  45
  46 # Check if there's a prebuilt binary and if so just fetch that. That's faster,
  47 # and goma relies on having matching binary hashes on client and server too.
  48 CDS_FILE="clang-${PACKAGE_VERSION}.tgz"
  49 CDS_OUT_DIR=$(mktemp -d -t clang_download.XXXXXX)
  50 CDS_OUTPUT="${CDS_OUT_DIR}/${CDS_FILE}"
  51 if [ "${OS}" = "Linux" ]; then
  52   CDS_FULL_URL="${CDS_URL}/Linux_x64/${CDS_FILE}"
  53 elif [ "${OS}" = "Darwin" ]; then
  54   CDS_FULL_URL="${CDS_URL}/Mac/${CDS_FILE}"
  55 fi
  56 echo Trying to download prebuilt clang
  57 if which curl > /dev/null; then
  58   curl -L --fail "${CDS_FULL_URL}" -o "${CDS_OUTPUT}" || \
  59       rm -rf "${CDS_OUT_DIR}"
  60 elif which wget > /dev/null; then
  61   wget "${CDS_FULL_URL}" -O "${CDS_OUTPUT}" || rm -rf "${CDS_OUT_DIR}"
  62 else
  63   echo "Neither curl nor wget found. Please install one of these."
  64   exit 1
  65 fi
  66 if [ -f "${CDS_OUTPUT}" ]; then
  67   rm -rf "${LLVM_BUILD_DIR}"
  68   mkdir -p "${LLVM_BUILD_DIR}"
  69   tar -xzf "${CDS_OUTPUT}" -C "${LLVM_BUILD_DIR}"
  70   echo clang "${PACKAGE_VERSION}" unpacked
  71   echo "${PACKAGE_VERSION}" > "${STAMP_FILE}"
  72   rm -rf "${CDS_OUT_DIR}"
  73   exit 0
  74 else
  75   echo Did not find prebuilt clang "${PACKAGE_VERSION}", building
  76 fi