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#!/bin/bash -eux
# Copyright 2016 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
################################################################################
NPROC=16 # See issue #4270. The compiler crashes on GCB instance with 32 vCPUs.
LLVM_DEP_PACKAGES="build-essential make cmake ninja-build git python2.7 g++-multilib"
apt-get install -y $LLVM_DEP_PACKAGES
# Checkout
CHECKOUT_RETRIES=10
function clone_with_retries {
REPOSITORY=$1
LOCAL_PATH=$2
CHECKOUT_RETURN_CODE=1
# Disable exit on error since we might encounter some failures while retrying.
set +e
for i in $(seq 1 $CHECKOUT_RETRIES); do
rm -rf $LOCAL_PATH
git clone $REPOSITORY $LOCAL_PATH
CHECKOUT_RETURN_CODE=$?
if [ $CHECKOUT_RETURN_CODE -eq 0 ]; then
break
fi
done
# Re-enable exit on error. If checkout failed, script will exit.
set -e
return $CHECKOUT_RETURN_CODE
}
function cmake_llvm {
extra_args="$@"
cmake -G "Ninja" \
-DLIBCXX_ENABLE_SHARED=OFF \
-DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=ON \
-DLIBCXXABI_ENABLE_SHARED=OFF \
-DCMAKE_BUILD_TYPE=Release \
-DLLVM_TARGETS_TO_BUILD="$TARGET_TO_BUILD" \
-DLLVM_ENABLE_PROJECTS="$PROJECTS_TO_BUILD" \
$extra_args \
$LLVM_SRC/llvm
}
# Use chromium's clang revision
mkdir $SRC/chromium_tools
cd $SRC/chromium_tools
git clone https://chromium.googlesource.com/chromium/src/tools/clang
cd clang
LLVM_SRC=$SRC/llvm-project
# For manual bumping.
OUR_LLVM_REVISION=e84b7a5fe230e42b8e6fe451369874a773bf1867
# To allow for manual downgrades. Set to 0 to use Chrome's clang version (i.e.
# *not* force a manual downgrade). Set to 1 to force a manual downgrade.
FORCE_OUR_REVISION=0
LLVM_REVISION=$(grep -Po "CLANG_REVISION = '\K([^']+)" scripts/update.py)
clone_with_retries https://github.com/llvm/llvm-project.git $LLVM_SRC
set +e
git -C $LLVM_SRC merge-base --is-ancestor $OUR_LLVM_REVISION $LLVM_REVISION
IS_OUR_REVISION_ANCESTOR_RETCODE=$?
set -e
# Use our revision if specified by FORCE_OUR_REVISION or if our revision is a
# later revision than Chrome's (i.e. not an ancestor of Chrome's).
if [ $IS_OUR_REVISION_ANCESTOR_RETCODE -ne 0 ] || [ $FORCE_OUR_REVISION -eq 1 ] ; then
LLVM_REVISION=$OUR_LLVM_REVISION
fi
git -C $LLVM_SRC checkout $LLVM_REVISION
echo "Using LLVM revision: $LLVM_REVISION"
# Build & install. We build clang in two stages because gcc can't build a
# static version of libcxxabi
# (see https://github.com/google/oss-fuzz/issues/2164).
mkdir -p $WORK/llvm-stage2 $WORK/llvm-stage1
cd $WORK/llvm-stage1
TARGET_TO_BUILD=
case $(uname -m) in
x86_64)
TARGET_TO_BUILD=X86
;;
aarch64)
TARGET_TO_BUILD=AArch64
;;
*)
echo "Error: unsupported target $(uname -m)"
exit 1
;;
esac
PROJECTS_TO_BUILD="libcxx;libcxxabi;compiler-rt;clang;lld"
cmake_llvm
ninja -j $NPROC
cd $WORK/llvm-stage2
export CC=$WORK/llvm-stage1/bin/clang
export CXX=$WORK/llvm-stage1/bin/clang++
cmake_llvm
ninja -j $NPROC
ninja install
rm -rf $WORK/llvm-stage1 $WORK/llvm-stage2
# Use the clang we just built from now on.
CMAKE_EXTRA_ARGS="-DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++"
# 32-bit libraries.
mkdir -p $WORK/i386
cd $WORK/i386
cmake_llvm $CMAKE_EXTRA_ARGS \
-DCMAKE_INSTALL_PREFIX=/usr/i386/ \
-DCMAKE_C_FLAGS="-m32" \
-DCMAKE_CXX_FLAGS="-m32"
ninja -j $NPROC cxx
ninja install-cxx
rm -rf $WORK/i386
# MemorySanitizer instrumented libraries.
mkdir -p $WORK/msan
cd $WORK/msan
# https://github.com/google/oss-fuzz/issues/1099
cat <<EOF > $WORK/msan/blacklist.txt
fun:__gxx_personality_*
EOF
cmake_llvm $CMAKE_EXTRA_ARGS \
-DLLVM_USE_SANITIZER=Memory \
-DCMAKE_INSTALL_PREFIX=/usr/msan/ \
-DCMAKE_CXX_FLAGS="-fsanitize-blacklist=$WORK/msan/blacklist.txt"
ninja -j $NPROC cxx
ninja install-cxx
rm -rf $WORK/msan
# DataFlowSanitizer instrumented libraries.
mkdir -p $WORK/dfsan
cd $WORK/dfsan
cmake_llvm $CMAKE_EXTRA_ARGS \
-DLLVM_USE_SANITIZER=DataFlow \
-DCMAKE_INSTALL_PREFIX=/usr/dfsan/
ninja -j $NPROC cxx cxxabi
ninja install-cxx install-cxxabi
rm -rf $WORK/dfsan
# libFuzzer sources.
cp -r $LLVM_SRC/compiler-rt/lib/fuzzer $SRC/libfuzzer
# Cleanup
rm -rf $LLVM_SRC
rm -rf $SRC/chromium_tools
apt-get remove --purge -y $LLVM_DEP_PACKAGES
apt-get autoremove -y
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