tools/clang/scripts/update.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=233105
  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="${THIS_DIR}/../../../third_party/llvm"
  20 LLVM_BUILD_DIR="${LLVM_DIR}/../llvm-build/Release+Asserts"
  21 COMPILER_RT_BUILD_DIR="${LLVM_DIR}/../llvm-build/compiler-rt"
  22 LLVM_BOOTSTRAP_DIR="${LLVM_DIR}/../llvm-bootstrap"
  23 LLVM_BOOTSTRAP_INSTALL_DIR="${LLVM_DIR}/../llvm-bootstrap-install"
  24 CLANG_DIR="${LLVM_DIR}/tools/clang"
  25 COMPILER_RT_DIR="${LLVM_DIR}/compiler-rt"
  26 LIBCXX_DIR="${LLVM_DIR}/projects/libcxx"
  27 LIBCXXABI_DIR="${LLVM_DIR}/projects/libcxxabi"
  28 ANDROID_NDK_DIR="${THIS_DIR}/../../../third_party/android_tools/ndk"
  29 STAMP_FILE="${LLVM_DIR}/../llvm-build/cr_build_revision"
  30 CHROMIUM_TOOLS_DIR="${THIS_DIR}/.."
  31 BINUTILS_DIR="${THIS_DIR}/../../../third_party/binutils"
  32
  33 ABS_CHROMIUM_TOOLS_DIR="${PWD}/${CHROMIUM_TOOLS_DIR}"
  34 ABS_LIBCXX_DIR="${PWD}/${LIBCXX_DIR}"
  35 ABS_LIBCXXABI_DIR="${PWD}/${LIBCXXABI_DIR}"
  36 ABS_LLVM_DIR="${PWD}/${LLVM_DIR}"
  37 ABS_LLVM_BUILD_DIR="${PWD}/${LLVM_BUILD_DIR}"
  38 ABS_COMPILER_RT_DIR="${PWD}/${COMPILER_RT_DIR}"
  39 ABS_BINUTILS_DIR="${PWD}/${BINUTILS_DIR}"
  40
  41 # ${A:-a} returns $A if it's set, a else.
  42 LLVM_REPO_URL=${LLVM_URL:-https://llvm.org/svn/llvm-project}
  43
  44 CDS_URL=https://commondatastorage.googleapis.com/chromium-browser-clang
  45
  46 if [[ -z "$GYP_DEFINES" ]]; then
  47   GYP_DEFINES=
  48 fi
  49 if [[ -z "$GYP_GENERATORS" ]]; then
  50   GYP_GENERATORS=
  51 fi
  52
  53
  54 # Die if any command dies, error on undefined variable expansions.
  55 set -eu
  56
  57
  58 if [[ -n ${LLVM_FORCE_HEAD_REVISION:-''} ]]; then
  59   # Use a real version number rather than HEAD to make sure that
  60   # --print-revision, stamp file logic, etc. all works naturally.
  61   CLANG_REVISION=$(svn info "$LLVM_REPO_URL" \
  62       | grep 'Last Changed Rev' | awk '{ printf $4; }')
  63   PACKAGE_VERSION="${CLANG_REVISION}-0"
  64 fi
  65
  66 # Use both the clang revision and the plugin revisions to test for updates.
  67 BLINKGCPLUGIN_REVISION=\
  68 $(grep 'set(LIBRARYNAME' "$THIS_DIR"/../blink_gc_plugin/CMakeLists.txt \
  69     | cut -d ' ' -f 2 | tr -cd '[0-9]')
  70 CLANG_AND_PLUGINS_REVISION="${CLANG_REVISION}-${BLINKGCPLUGIN_REVISION}"
  71
  72
  73 OS="$(uname -s)"
  74
  75 # Parse command line options.
  76 if_needed=
  77 force_local_build=
  78 run_tests=
  79 bootstrap=
  80 with_android=yes
  81 chrome_tools="plugins;blink_gc_plugin"
  82 gcc_toolchain=
  83 with_patches=yes
  84
  85 if [[ "${OS}" = "Darwin" ]]; then
  86   with_android=
  87 fi
  88
  89 while [[ $# > 0 ]]; do
  90   case $1 in
  91     --bootstrap)
  92       bootstrap=yes
  93       ;;
  94     --if-needed)
  95       if_needed=yes
  96       ;;
  97     --force-local-build)
  98       force_local_build=yes
  99       ;;
 100     --print-revision)
 101       echo $PACKAGE_VERSION
 102       exit 0
 103       ;;
 104     --run-tests)
 105       run_tests=yes
 106       ;;
 107     --without-android)
 108       with_android=
 109       ;;
 110     --without-patches)
 111       with_patches=
 112       ;;
 113     --with-chrome-tools)
 114       shift
 115       if [[ $# == 0 ]]; then
 116         echo "--with-chrome-tools requires an argument."
 117         exit 1
 118       fi
 119       chrome_tools=$1
 120       ;;
 121     --gcc-toolchain)
 122       shift
 123       if [[ $# == 0 ]]; then
 124         echo "--gcc-toolchain requires an argument."
 125         exit 1
 126       fi
 127       if [[ -x "$1/bin/gcc" ]]; then
 128         gcc_toolchain=$1
 129       else
 130         echo "Invalid --gcc-toolchain: '$1'."
 131         echo "'$1/bin/gcc' does not appear to be valid."
 132         exit 1
 133       fi
 134       ;;
 135
 136     --help)
 137       echo "usage: $0 [--force-local-build] [--if-needed] [--run-tests] "
 138       echo "--bootstrap: First build clang with CC, then with itself."
 139       echo "--force-local-build: Don't try to download prebuilt binaries."
 140       echo "--if-needed: Download clang only if the script thinks it is needed."
 141       echo "--run-tests: Run tests after building. Only for local builds."
 142       echo "--print-revision: Print current clang revision and exit."
 143       echo "--without-android: Don't build ASan Android runtime library."
 144       echo "--with-chrome-tools: Select which chrome tools to build." \
 145            "Defaults to plugins;blink_gc_plugin."
 146       echo "    Example: --with-chrome-tools plugins;empty-string"
 147       echo "--gcc-toolchain: Set the prefix for which GCC version should"
 148       echo "    be used for building. For example, to use gcc in"
 149       echo "    /opt/foo/bin/gcc, use '--gcc-toolchain '/opt/foo"
 150       echo "--without-patches: Don't apply local patches."
 151       echo
 152       exit 1
 153       ;;
 154     *)
 155       echo "Unknown argument: '$1'."
 156       echo "Use --help for help."
 157       exit 1
 158       ;;
 159   esac
 160   shift
 161 done
 162
 163 if [[ -n ${LLVM_FORCE_HEAD_REVISION:-''} ]]; then
 164   force_local_build=yes
 165
 166   # Skip local patches when using HEAD: they probably don't apply anymore.
 167   with_patches=
 168
 169   if ! [[ "$GYP_DEFINES" =~ .*OS=android.* ]]; then
 170     # Only build the Android ASan rt when targetting Android.
 171     with_android=
 172   fi
 173
 174   LLVM_BUILD_TOOLS_DIR="${ABS_LLVM_DIR}/../llvm-build-tools"
 175
 176   if [[ "${OS}" == "Linux" ]] && [[ -z "${gcc_toolchain}" ]]; then
 177     if [[ $(gcc -dumpversion) < "4.7.0" ]]; then
 178       # We need a newer GCC version.
 179       if [[ ! -e "${LLVM_BUILD_TOOLS_DIR}/gcc482" ]]; then
 180         echo "Downloading pre-built GCC 4.8.2..."
 181         mkdir -p "${LLVM_BUILD_TOOLS_DIR}"
 182         curl --fail -L "${CDS_URL}/tools/gcc482.tgz" | \
 183           tar zxf - -C "${LLVM_BUILD_TOOLS_DIR}"
 184         echo Done
 185       fi
 186       gcc_toolchain="${LLVM_BUILD_TOOLS_DIR}/gcc482"
 187     else
 188       # Always set gcc_toolchain; llvm-symbolizer needs the bundled libstdc++.
 189       gcc_toolchain="$(dirname $(dirname $(which gcc)))"
 190     fi
 191   fi
 192
 193   if [[ "${OS}" == "Linux" ]]; then
 194     # TODO(hans): Might need to make this work on Mac eventually.
 195     if [[ $(cmake --version | grep -Eo '[0-9.]+') < "3.0" ]]; then
 196       # We need a newer CMake version.
 197       if [[ ! -e "${LLVM_BUILD_TOOLS_DIR}/cmake310" ]]; then
 198         echo "Downloading pre-built CMake 3.10..."
 199         mkdir -p "${LLVM_BUILD_TOOLS_DIR}"
 200         curl --fail -L "${CDS_URL}/tools/cmake310.tgz" | \
 201           tar zxf - -C "${LLVM_BUILD_TOOLS_DIR}"
 202         echo Done
 203       fi
 204       export PATH="${LLVM_BUILD_TOOLS_DIR}/cmake310/bin:${PATH}"
 205     fi
 206   fi
 207
 208   echo "LLVM_FORCE_HEAD_REVISION was set; using r${CLANG_REVISION}"
 209 fi
 210
 211 if [[ -n "$if_needed" ]]; then
 212   if [[ "${OS}" == "Darwin" ]]; then
 213     # clang is used on Mac.
 214     true
 215   elif [[ "$GYP_DEFINES" =~ .*(clang|tsan|asan|lsan|msan)=1.* ]]; then
 216     # clang requested via $GYP_DEFINES.
 217     true
 218   elif [[ -d "${LLVM_BUILD_DIR}" ]]; then
 219     # clang previously downloaded, remove third_party/llvm-build to prevent
 220     # updating.
 221     true
 222   elif [[ "${OS}" == "Linux" ]]; then
 223     # Temporarily use clang on linux. Leave a stamp file behind, so that
 224     # this script can remove clang again on machines where it was autoinstalled.
 225     mkdir -p "${LLVM_BUILD_DIR}"
 226     touch "${LLVM_BUILD_DIR}/autoinstall_stamp"
 227     true
 228   else
 229     # clang wasn't needed, not doing anything.
 230     exit 0
 231   fi
 232 fi
 233
 234
 235 # Check if there's anything to be done, exit early if not.
 236 if [[ -f "${STAMP_FILE}" ]]; then
 237   PREVIOUSLY_BUILT_REVISON=$(cat "${STAMP_FILE}")
 238   if [[ -z "$force_local_build" ]] && \
 239        [[ "${PREVIOUSLY_BUILT_REVISON}" = \
 240           "${PACKAGE_VERSION}" ]]; then
 241     echo "Clang already at ${PACKAGE_VERSION}"
 242     exit 0
 243   fi
 244 fi
 245 # To always force a new build if someone interrupts their build half way.
 246 rm -f "${STAMP_FILE}"
 247
 248
 249 if [[ -z "$force_local_build" ]]; then
 250   # Check if there's a prebuilt binary and if so just fetch that. That's faster,
 251   # and goma relies on having matching binary hashes on client and server too.
 252   CDS_FILE="clang-${PACKAGE_VERSION}.tgz"
 253   CDS_OUT_DIR=$(mktemp -d -t clang_download.XXXXXX)
 254   CDS_OUTPUT="${CDS_OUT_DIR}/${CDS_FILE}"
 255   if [ "${OS}" = "Linux" ]; then
 256     CDS_FULL_URL="${CDS_URL}/Linux_x64/${CDS_FILE}"
 257   elif [ "${OS}" = "Darwin" ]; then
 258     CDS_FULL_URL="${CDS_URL}/Mac/${CDS_FILE}"
 259   fi
 260   echo Trying to download prebuilt clang
 261   if which curl > /dev/null; then
 262     curl -L --fail "${CDS_FULL_URL}" -o "${CDS_OUTPUT}" || \
 263         rm -rf "${CDS_OUT_DIR}"
 264   elif which wget > /dev/null; then
 265     wget "${CDS_FULL_URL}" -O "${CDS_OUTPUT}" || rm -rf "${CDS_OUT_DIR}"
 266   else
 267     echo "Neither curl nor wget found. Please install one of these."
 268     exit 1
 269   fi
 270   if [ -f "${CDS_OUTPUT}" ]; then
 271     rm -rf "${LLVM_BUILD_DIR}"
 272     mkdir -p "${LLVM_BUILD_DIR}"
 273     tar -xzf "${CDS_OUTPUT}" -C "${LLVM_BUILD_DIR}"
 274     echo clang "${PACKAGE_VERSION}" unpacked
 275     echo "${PACKAGE_VERSION}" > "${STAMP_FILE}"
 276     rm -rf "${CDS_OUT_DIR}"
 277     exit 0
 278   else
 279     echo Did not find prebuilt clang "${PACKAGE_VERSION}", building
 280   fi
 281 fi
 282
 283 if [[ -n "${with_android}" ]] && ! [[ -d "${ANDROID_NDK_DIR}" ]]; then
 284   echo "Android NDK not found at ${ANDROID_NDK_DIR}"
 285   echo "The Android NDK is needed to build a Clang whose -fsanitize=address"
 286   echo "works on Android. See "
 287   echo "http://code.google.com/p/chromium/wiki/AndroidBuildInstructions for how"
 288   echo "to install the NDK, or pass --without-android."
 289   exit 1
 290 fi
 291
 292 # Check that cmake and ninja are available.
 293 if ! which cmake > /dev/null; then
 294   echo "CMake needed to build clang; please install"
 295   exit 1
 296 fi
 297 if ! which ninja > /dev/null; then
 298   echo "ninja needed to build clang, please install"
 299   exit 1
 300 fi
 301
 302 echo Reverting previously patched files
 303 for i in \
 304       "${CLANG_DIR}/test/Index/crash-recovery-modules.m" \
 305       "${CLANG_DIR}/unittests/libclang/LibclangTest.cpp" \
 306       "${COMPILER_RT_DIR}/lib/asan/asan_rtl.cc" \
 307       "${COMPILER_RT_DIR}/test/asan/TestCases/Linux/new_array_cookie_test.cc" \
 308       "${LLVM_DIR}/test/DebugInfo/gmlt.ll" \
 309       "${LLVM_DIR}/lib/CodeGen/SpillPlacement.cpp" \
 310       "${LLVM_DIR}/lib/CodeGen/SpillPlacement.h" \
 311       "${LLVM_DIR}/lib/Transforms/Instrumentation/MemorySanitizer.cpp" \
 312       "${CLANG_DIR}/test/Driver/env.c" \
 313       "${CLANG_DIR}/lib/Frontend/InitPreprocessor.cpp" \
 314       "${CLANG_DIR}/test/Frontend/exceptions.c" \
 315       "${CLANG_DIR}/test/Preprocessor/predefined-exceptions.m" \
 316       "${LLVM_DIR}/test/Bindings/Go/go.test" \
 317       "${CLANG_DIR}/lib/Parse/ParseExpr.cpp" \
 318       "${CLANG_DIR}/lib/Parse/ParseTemplate.cpp" \
 319       "${CLANG_DIR}/lib/Sema/SemaDeclCXX.cpp" \
 320       "${CLANG_DIR}/lib/Sema/SemaExprCXX.cpp" \
 321       "${CLANG_DIR}/test/SemaCXX/default2.cpp" \
 322       "${CLANG_DIR}/test/SemaCXX/typo-correction-delayed.cpp" \
 323       "${COMPILER_RT_DIR}/lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc" \
 324       "${COMPILER_RT_DIR}/test/tsan/signal_segv_handler.cc" \
 325       ; do
 326   if [[ -e "${i}" ]]; then
 327     rm -f "${i}"  # For unversioned files.
 328     svn revert "${i}"
 329   fi;
 330 done
 331
 332 echo Remove the Clang tools shim dir
 333 CHROME_TOOLS_SHIM_DIR=${ABS_LLVM_DIR}/tools/chrometools
 334 rm -rfv ${CHROME_TOOLS_SHIM_DIR}
 335
 336 echo Getting LLVM r"${CLANG_REVISION}" in "${LLVM_DIR}"
 337 if ! svn co --force "${LLVM_REPO_URL}/llvm/trunk@${CLANG_REVISION}" \
 338                     "${LLVM_DIR}"; then
 339   echo Checkout failed, retrying
 340   rm -rf "${LLVM_DIR}"
 341   svn co --force "${LLVM_REPO_URL}/llvm/trunk@${CLANG_REVISION}" "${LLVM_DIR}"
 342 fi
 343
 344 echo Getting clang r"${CLANG_REVISION}" in "${CLANG_DIR}"
 345 svn co --force "${LLVM_REPO_URL}/cfe/trunk@${CLANG_REVISION}" "${CLANG_DIR}"
 346
 347 # We have moved from building compiler-rt in the LLVM tree, to a separate
 348 # directory. Nuke any previous checkout to avoid building it.
 349 rm -rf "${LLVM_DIR}/projects/compiler-rt"
 350
 351 echo Getting compiler-rt r"${CLANG_REVISION}" in "${COMPILER_RT_DIR}"
 352 svn co --force "${LLVM_REPO_URL}/compiler-rt/trunk@${CLANG_REVISION}" \
 353                "${COMPILER_RT_DIR}"
 354
 355 # clang needs a libc++ checkout, else -stdlib=libc++ won't find includes
 356 # (i.e. this is needed for bootstrap builds).
 357 if [ "${OS}" = "Darwin" ]; then
 358   echo Getting libc++ r"${CLANG_REVISION}" in "${LIBCXX_DIR}"
 359   svn co --force "${LLVM_REPO_URL}/libcxx/trunk@${CLANG_REVISION}" \
 360                  "${LIBCXX_DIR}"
 361 fi
 362
 363 # While we're bundling our own libc++ on OS X, we need to compile libc++abi
 364 # into it too (since OS X 10.6 doesn't have libc++abi.dylib either).
 365 if [ "${OS}" = "Darwin" ]; then
 366   echo Getting libc++abi r"${CLANG_REVISION}" in "${LIBCXXABI_DIR}"
 367   svn co --force "${LLVM_REPO_URL}/libcxxabi/trunk@${CLANG_REVISION}" \
 368                  "${LIBCXXABI_DIR}"
 369 fi
 370
 371 if [[ -n "$with_patches" ]]; then
 372
 373   # Apply patch for tests failing with --disable-pthreads (llvm.org/PR11974)
 374   pushd "${CLANG_DIR}"
 375   cat << 'EOF' |
 376 --- third_party/llvm/tools/clang/test/Index/crash-recovery-modules.m    (revision 202554)
 377 +++ third_party/llvm/tools/clang/test/Index/crash-recovery-modules.m    (working copy)
 378 @@ -12,6 +12,8 @@
 379
 380  // REQUIRES: crash-recovery
 381  // REQUIRES: shell
 382 +// XFAIL: *
 383 +//    (PR11974)
 384
 385  @import Crash;
 386 EOF
 387 patch -p4
 388 popd
 389
 390 pushd "${CLANG_DIR}"
 391 cat << 'EOF' |
 392 --- unittests/libclang/LibclangTest.cpp (revision 215949)
 393 +++ unittests/libclang/LibclangTest.cpp (working copy)
 394 @@ -431,7 +431,7 @@
 395    EXPECT_EQ(0U, clang_getNumDiagnostics(ClangTU));
 396  }
 397
 398 -TEST_F(LibclangReparseTest, ReparseWithModule) {
 399 +TEST_F(LibclangReparseTest, DISABLED_ReparseWithModule) {
 400    const char *HeaderTop = "#ifndef H\n#define H\nstruct Foo { int bar;";
 401    const char *HeaderBottom = "\n};\n#endif\n";
 402    const char *MFile = "#include \"HeaderFile.h\"\nint main() {"
 403 EOF
 404   patch -p0
 405   popd
 406
 407   # This Go bindings test doesn't work after the bootstrap build on Linux. (PR21552)
 408   pushd "${LLVM_DIR}"
 409   cat << 'EOF' |
 410 Index: test/Bindings/Go/go.test
 411 ===================================================================
 412 --- test/Bindings/Go/go.test    (revision 223109)
 413 +++ test/Bindings/Go/go.test    (working copy)
 414 @@ -1,3 +1,3 @@
 415 -; RUN: llvm-go test llvm.org/llvm/bindings/go/llvm
 416 +; RUN: true
 417
 418  ; REQUIRES: shell
 419 EOF
 420   patch -p0
 421   popd
 422
 423
 424 fi
 425
 426 # Echo all commands.
 427 set -x
 428
 429 # Set default values for CC and CXX if they're not set in the environment.
 430 CC=${CC:-cc}
 431 CXX=${CXX:-c++}
 432
 433 if [[ -n "${gcc_toolchain}" ]]; then
 434   # Use the specified gcc installation for building.
 435   CC="$gcc_toolchain/bin/gcc"
 436   CXX="$gcc_toolchain/bin/g++"
 437   # Set LD_LIBRARY_PATH to make auxiliary targets (tablegen, bootstrap compiler,
 438   # etc.) find the .so.
 439   export LD_LIBRARY_PATH="$(dirname $(${CXX} -print-file-name=libstdc++.so.6))"
 440 fi
 441
 442 CFLAGS=""
 443 CXXFLAGS=""
 444 LDFLAGS=""
 445
 446 # LLVM uses C++11 starting in llvm 3.5. On Linux, this means libstdc++4.7+ is
 447 # needed, on OS X it requires libc++. clang only automatically links to libc++
 448 # when targeting OS X 10.9+, so add stdlib=libc++ explicitly so clang can run on
 449 # OS X versions as old as 10.7.
 450 # TODO(thakis): Some bots are still on 10.6, so for now bundle libc++.dylib.
 451 # Remove this once all bots are on 10.7+, then use --enable-libcpp=yes and
 452 # change deployment_target to 10.7.
 453 deployment_target=""
 454
 455 if [ "${OS}" = "Darwin" ]; then
 456   # When building on 10.9, /usr/include usually doesn't exist, and while
 457   # Xcode's clang automatically sets a sysroot, self-built clangs don't.
 458   CFLAGS="-isysroot $(xcrun --show-sdk-path)"
 459   CPPFLAGS="${CFLAGS}"
 460   CXXFLAGS="-stdlib=libc++ -nostdinc++ -I${ABS_LIBCXX_DIR}/include ${CFLAGS}"
 461
 462   if [[ -n "${bootstrap}" ]]; then
 463     deployment_target=10.6
 464   fi
 465 fi
 466
 467 # Build bootstrap clang if requested.
 468 if [[ -n "${bootstrap}" ]]; then
 469   ABS_INSTALL_DIR="${PWD}/${LLVM_BOOTSTRAP_INSTALL_DIR}"
 470   echo "Building bootstrap compiler"
 471   mkdir -p "${LLVM_BOOTSTRAP_DIR}"
 472   pushd "${LLVM_BOOTSTRAP_DIR}"
 473
 474   cmake -GNinja \
 475       -DCMAKE_BUILD_TYPE=Release \
 476       -DLLVM_ENABLE_ASSERTIONS=ON \
 477       -DLLVM_TARGETS_TO_BUILD=host \
 478       -DLLVM_ENABLE_THREADS=OFF \
 479       -DCMAKE_INSTALL_PREFIX="${ABS_INSTALL_DIR}" \
 480       -DCMAKE_C_COMPILER="${CC}" \
 481       -DCMAKE_CXX_COMPILER="${CXX}" \
 482       -DCMAKE_C_FLAGS="${CFLAGS}" \
 483       -DCMAKE_CXX_FLAGS="${CXXFLAGS}" \
 484       ../llvm
 485
 486   ninja
 487   if [[ -n "${run_tests}" ]]; then
 488     ninja check-all
 489   fi
 490
 491   ninja install
 492   if [[ -n "${gcc_toolchain}" ]]; then
 493     # Copy that gcc's stdlibc++.so.6 to the build dir, so the bootstrap
 494     # compiler can start.
 495     cp -v "$(${CXX} -print-file-name=libstdc++.so.6)" \
 496       "${ABS_INSTALL_DIR}/lib/"
 497   fi
 498
 499   popd
 500   CC="${ABS_INSTALL_DIR}/bin/clang"
 501   CXX="${ABS_INSTALL_DIR}/bin/clang++"
 502
 503   if [[ -n "${gcc_toolchain}" ]]; then
 504     # Tell the bootstrap compiler to use a specific gcc prefix to search
 505     # for standard library headers and shared object file.
 506     CFLAGS="--gcc-toolchain=${gcc_toolchain}"
 507     CXXFLAGS="--gcc-toolchain=${gcc_toolchain}"
 508   fi
 509
 510   echo "Building final compiler"
 511 fi
 512
 513 # Build clang (in a separate directory).
 514 # The clang bots have this path hardcoded in built/scripts/slave/compile.py,
 515 # so if you change it you also need to change these links.
 516 mkdir -p "${LLVM_BUILD_DIR}"
 517 pushd "${LLVM_BUILD_DIR}"
 518
 519 # Build libc++.dylib while some bots are still on OS X 10.6.
 520 if [ "${OS}" = "Darwin" ]; then
 521   rm -rf libcxxbuild
 522   LIBCXXFLAGS="-O3 -std=c++11 -fstrict-aliasing"
 523
 524   # libcxx and libcxxabi both have a file stdexcept.cpp, so put their .o files
 525   # into different subdirectories.
 526   mkdir -p libcxxbuild/libcxx
 527   pushd libcxxbuild/libcxx
 528   ${CXX:-c++} -c ${CXXFLAGS} ${LIBCXXFLAGS} "${ABS_LIBCXX_DIR}"/src/*.cpp
 529   popd
 530
 531   mkdir -p libcxxbuild/libcxxabi
 532   pushd libcxxbuild/libcxxabi
 533   ${CXX:-c++} -c ${CXXFLAGS} ${LIBCXXFLAGS} "${ABS_LIBCXXABI_DIR}"/src/*.cpp -I"${ABS_LIBCXXABI_DIR}/include"
 534   popd
 535
 536   pushd libcxxbuild
 537   ${CC:-cc} libcxx/*.o libcxxabi/*.o -o libc++.1.dylib -dynamiclib \
 538     -nodefaultlibs -current_version 1 -compatibility_version 1 \
 539     -lSystem -install_name @executable_path/libc++.dylib \
 540     -Wl,-unexported_symbols_list,${ABS_LIBCXX_DIR}/lib/libc++unexp.exp \
 541     -Wl,-force_symbols_not_weak_list,${ABS_LIBCXX_DIR}/lib/notweak.exp \
 542     -Wl,-force_symbols_weak_list,${ABS_LIBCXX_DIR}/lib/weak.exp
 543   ln -sf libc++.1.dylib libc++.dylib
 544   popd
 545   LDFLAGS+="-stdlib=libc++ -L${PWD}/libcxxbuild"
 546 fi
 547
 548 # Find the binutils include dir for the gold plugin.
 549 BINUTILS_INCDIR=""
 550 if [ "${OS}" = "Linux" ]; then
 551   BINUTILS_INCDIR="${ABS_BINUTILS_DIR}/Linux_x64/Release/include"
 552 fi
 553
 554 # Hook the Chromium tools into the LLVM build. Several Chromium tools have
 555 # dependencies on LLVM/Clang libraries. The LLVM build detects implicit tools
 556 # in the tools subdirectory, so install a shim CMakeLists.txt that forwards to
 557 # the real directory for the Chromium tools.
 558 # Note that the shim directory name intentionally has no _ or _. The implicit
 559 # tool detection logic munges them in a weird way.
 560 mkdir -v ${CHROME_TOOLS_SHIM_DIR}
 561 cat > ${CHROME_TOOLS_SHIM_DIR}/CMakeLists.txt << EOF
 562 # Since tools/clang isn't actually a subdirectory, use the two argument version
 563 # to specify where build artifacts go. CMake doesn't allow reusing the same
 564 # binary dir for multiple source dirs, so the build artifacts have to go into a
 565 # subdirectory...
 566 add_subdirectory(\${CHROMIUM_TOOLS_SRC} \${CMAKE_CURRENT_BINARY_DIR}/a)
 567 EOF
 568 rm -fv CMakeCache.txt
 569 MACOSX_DEPLOYMENT_TARGET=${deployment_target} cmake -GNinja \
 570     -DCMAKE_BUILD_TYPE=Release \
 571     -DLLVM_ENABLE_ASSERTIONS=ON \
 572     -DLLVM_ENABLE_THREADS=OFF \
 573     -DLLVM_BINUTILS_INCDIR="${BINUTILS_INCDIR}" \
 574     -DCMAKE_C_COMPILER="${CC}" \
 575     -DCMAKE_CXX_COMPILER="${CXX}" \
 576     -DCMAKE_C_FLAGS="${CFLAGS}" \
 577     -DCMAKE_CXX_FLAGS="${CXXFLAGS}" \
 578     -DCMAKE_EXE_LINKER_FLAGS="${LDFLAGS}" \
 579     -DCMAKE_SHARED_LINKER_FLAGS="${LDFLAGS}" \
 580     -DCMAKE_MODULE_LINKER_FLAGS="${LDFLAGS}" \
 581     -DCMAKE_INSTALL_PREFIX="${ABS_LLVM_BUILD_DIR}" \
 582     -DCHROMIUM_TOOLS_SRC="${ABS_CHROMIUM_TOOLS_DIR}" \
 583     -DCHROMIUM_TOOLS="${chrome_tools}" \
 584     "${ABS_LLVM_DIR}"
 585 env
 586
 587 if [[ -n "${gcc_toolchain}" ]]; then
 588   # Copy in the right stdlibc++.so.6 so clang can start.
 589   mkdir -p lib
 590   cp -v "$(${CXX} ${CXXFLAGS} -print-file-name=libstdc++.so.6)" lib/
 591 fi
 592
 593 ninja
 594 # If any Chromium tools were built, install those now.
 595 if [[ -n "${chrome_tools}" ]]; then
 596   ninja cr-install
 597 fi
 598
 599 STRIP_FLAGS=
 600 if [ "${OS}" = "Darwin" ]; then
 601   # See http://crbug.com/256342
 602   STRIP_FLAGS=-x
 603
 604   cp libcxxbuild/libc++.1.dylib bin/
 605 fi
 606 strip ${STRIP_FLAGS} bin/clang
 607 popd
 608
 609 # Build compiler-rt out-of-tree.
 610 mkdir -p "${COMPILER_RT_BUILD_DIR}"
 611 pushd "${COMPILER_RT_BUILD_DIR}"
 612
 613 rm -fv CMakeCache.txt
 614 MACOSX_DEPLOYMENT_TARGET=${deployment_target} cmake -GNinja \
 615     -DCMAKE_BUILD_TYPE=Release \
 616     -DLLVM_ENABLE_ASSERTIONS=ON \
 617     -DLLVM_ENABLE_THREADS=OFF \
 618     -DCMAKE_C_COMPILER="${CC}" \
 619     -DCMAKE_CXX_COMPILER="${CXX}" \
 620     -DLLVM_CONFIG_PATH="${ABS_LLVM_BUILD_DIR}/bin/llvm-config" \
 621     "${ABS_COMPILER_RT_DIR}"
 622
 623 ninja
 624
 625 # Copy selected output to the main tree.
 626 # Darwin doesn't support cp --parents, so pipe through tar instead.
 627 CLANG_VERSION=$("${ABS_LLVM_BUILD_DIR}/bin/clang" --version | \
 628      sed -ne 's/clang version \([0-9]\.[0-9]\.[0-9]\).*/\1/p')
 629 ABS_LLVM_CLANG_LIB_DIR="${ABS_LLVM_BUILD_DIR}/lib/clang/${CLANG_VERSION}"
 630 tar -c *blacklist.txt | tar -C ${ABS_LLVM_CLANG_LIB_DIR} -xv
 631 tar -c include/sanitizer | tar -C ${ABS_LLVM_CLANG_LIB_DIR} -xv
 632 if [[ "${OS}" = "Darwin" ]]; then
 633   tar -c lib/darwin | tar -C ${ABS_LLVM_CLANG_LIB_DIR} -xv
 634 else
 635   tar -c lib/linux | tar -C ${ABS_LLVM_CLANG_LIB_DIR} -xv
 636 fi
 637
 638 popd
 639
 640 if [[ -n "${with_android}" ]]; then
 641   # Make a standalone Android toolchain.
 642   ${ANDROID_NDK_DIR}/build/tools/make-standalone-toolchain.sh \
 643       --platform=android-14 \
 644       --install-dir="${LLVM_BUILD_DIR}/android-toolchain" \
 645       --system=linux-x86_64 \
 646       --stl=stlport \
 647       --toolchain=arm-linux-androideabi-4.9
 648
 649   # Android NDK r9d copies a broken unwind.h into the toolchain, see
 650   # http://crbug.com/357890
 651   rm -v "${LLVM_BUILD_DIR}"/android-toolchain/include/c++/*/unwind.h
 652
 653   # Build ASan runtime for Android in a separate build tree.
 654   mkdir -p ${LLVM_BUILD_DIR}/android
 655   pushd ${LLVM_BUILD_DIR}/android
 656   rm -fv CMakeCache.txt
 657   MACOSX_DEPLOYMENT_TARGET=${deployment_target} cmake -GNinja \
 658       -DCMAKE_BUILD_TYPE=Release \
 659       -DLLVM_ENABLE_ASSERTIONS=ON \
 660       -DLLVM_ENABLE_THREADS=OFF \
 661       -DCMAKE_C_COMPILER=${PWD}/../bin/clang \
 662       -DCMAKE_CXX_COMPILER=${PWD}/../bin/clang++ \
 663       -DLLVM_CONFIG_PATH=${PWD}/../bin/llvm-config \
 664       -DCMAKE_C_FLAGS="--target=arm-linux-androideabi --sysroot=${PWD}/../android-toolchain/sysroot -B${PWD}/../android-toolchain" \
 665       -DCMAKE_CXX_FLAGS="--target=arm-linux-androideabi --sysroot=${PWD}/../android-toolchain/sysroot -B${PWD}/../android-toolchain" \
 666       -DANDROID=1 \
 667       "${ABS_COMPILER_RT_DIR}"
 668   ninja libclang_rt.asan-arm-android.so
 669
 670   # And copy it into the main build tree.
 671   cp "$(find -name libclang_rt.asan-arm-android.so)" "${ABS_LLVM_CLANG_LIB_DIR}/lib/linux/"
 672   popd
 673 fi
 674
 675 if [[ -n "$run_tests" ]]; then
 676   # Run Chrome tool tests.
 677   ninja -C "${LLVM_BUILD_DIR}" cr-check-all
 678   # Run the LLVM and Clang tests.
 679   ninja -C "${LLVM_BUILD_DIR}" check-all
 680 fi
 681
 682 # After everything is done, log success for this revision.
 683 echo "${PACKAGE_VERSION}" > "${STAMP_FILE}"