Build and install LLVM gold plugin on Linux.

tools/clang/scripts/update.sh

 #!/usr/bin/env bash
 # Copyright (c) 2012 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.
 
 # Do NOT CHANGE this if you don't know what you're doing -- see
 # https://code.google.com/p/chromium/wiki/UpdatingClang
 # Reverting problematic clang rolls is safe, though.
@@ skipping 10 matching lines @@
 COMPILER_RT_BUILD_DIR="${LLVM_DIR}/../llvm-build/compiler-rt"
 LLVM_BOOTSTRAP_DIR="${LLVM_DIR}/../llvm-bootstrap"
 LLVM_BOOTSTRAP_INSTALL_DIR="${LLVM_DIR}/../llvm-bootstrap-install"
 CLANG_DIR="${LLVM_DIR}/tools/clang"
 COMPILER_RT_DIR="${LLVM_DIR}/compiler-rt"
 LIBCXX_DIR="${LLVM_DIR}/projects/libcxx"
 LIBCXXABI_DIR="${LLVM_DIR}/projects/libcxxabi"
 ANDROID_NDK_DIR="${THIS_DIR}/../../../third_party/android_tools/ndk"
 STAMP_FILE="${LLVM_DIR}/../llvm-build/cr_build_revision"
 CHROMIUM_TOOLS_DIR="${THIS_DIR}/.."
+BINUTILS_DIR="${THIS_DIR}/../../../third_party/binutils"
 
 ABS_CHROMIUM_TOOLS_DIR="${PWD}/${CHROMIUM_TOOLS_DIR}"
 ABS_LIBCXX_DIR="${PWD}/${LIBCXX_DIR}"
 ABS_LIBCXXABI_DIR="${PWD}/${LIBCXXABI_DIR}"
 ABS_LLVM_DIR="${PWD}/${LLVM_DIR}"
 ABS_LLVM_BUILD_DIR="${PWD}/${LLVM_BUILD_DIR}"
 ABS_COMPILER_RT_DIR="${PWD}/${COMPILER_RT_DIR}"
+ABS_BINUTILS_DIR="${PWD}/${BINUTILS_DIR}"
 
 # ${A:-a} returns $A if it's set, a else.
 LLVM_REPO_URL=${LLVM_URL:-https://llvm.org/svn/llvm-project}
 
 CDS_URL=https://commondatastorage.googleapis.com/chromium-browser-clang
 
 if [[ -z "$GYP_DEFINES" ]]; then
   GYP_DEFINES=
 fi
 if [[ -z "$GYP_GENERATORS" ]]; then
@@ skipping 488 matching lines @@
     -nodefaultlibs -current_version 1 -compatibility_version 1 \
     -lSystem -install_name @executable_path/libc++.dylib \
     -Wl,-unexported_symbols_list,${ABS_LIBCXX_DIR}/lib/libc++unexp.exp \
     -Wl,-force_symbols_not_weak_list,${ABS_LIBCXX_DIR}/lib/notweak.exp \
     -Wl,-force_symbols_weak_list,${ABS_LIBCXX_DIR}/lib/weak.exp
   ln -sf libc++.1.dylib libc++.dylib
   popd
   LDFLAGS+="-stdlib=libc++ -L${PWD}/libcxxbuild"
 fi
 
+# Find the binutils include dir for the gold plugin.
+BINUTILS_INCDIR=""
+if [ "${OS}" = "Linux" ]; then
+  BINUTILS_INCDIR="${ABS_BINUTILS_DIR}/Linux_x64/Release/include"
+fi
+
 # Hook the Chromium tools into the LLVM build. Several Chromium tools have
 # dependencies on LLVM/Clang libraries. The LLVM build detects implicit tools
 # in the tools subdirectory, so install a shim CMakeLists.txt that forwards to
 # the real directory for the Chromium tools.
 # Note that the shim directory name intentionally has no _ or _. The implicit
 # tool detection logic munges them in a weird way.
 mkdir -v ${CHROME_TOOLS_SHIM_DIR}
 cat > ${CHROME_TOOLS_SHIM_DIR}/CMakeLists.txt << EOF
 # Since tools/clang isn't actually a subdirectory, use the two argument version
 # to specify where build artifacts go. CMake doesn't allow reusing the same
 # binary dir for multiple source dirs, so the build artifacts have to go into a
 # subdirectory...
 add_subdirectory(\${CHROMIUM_TOOLS_SRC} \${CMAKE_CURRENT_BINARY_DIR}/a)
 EOF
 rm -fv CMakeCache.txt
 MACOSX_DEPLOYMENT_TARGET=${deployment_target} cmake -GNinja \
     -DCMAKE_BUILD_TYPE=Release \
     -DLLVM_ENABLE_ASSERTIONS=ON \
     -DLLVM_ENABLE_THREADS=OFF \
+    -DLLVM_BINUTILS_INCDIR="${BINUTILS_INCDIR}" \
     -DCMAKE_C_COMPILER="${CC}" \
     -DCMAKE_CXX_COMPILER="${CXX}" \
     -DCMAKE_C_FLAGS="${CFLAGS}" \
     -DCMAKE_CXX_FLAGS="${CXXFLAGS}" \
     -DCMAKE_EXE_LINKER_FLAGS="${LDFLAGS}" \
     -DCMAKE_SHARED_LINKER_FLAGS="${LDFLAGS}" \
     -DCMAKE_MODULE_LINKER_FLAGS="${LDFLAGS}" \
     -DCMAKE_INSTALL_PREFIX="${ABS_LLVM_BUILD_DIR}" \
     -DCHROMIUM_TOOLS_SRC="${ABS_CHROMIUM_TOOLS_DIR}" \
     -DCHROMIUM_TOOLS="${chrome_tools}" \
@@ skipping 90 matching lines @@
 
 if [[ -n "$run_tests" ]]; then
   # Run Chrome tool tests.
   ninja -C "${LLVM_BUILD_DIR}" cr-check-all
   # Run the LLVM and Clang tests.
   ninja -C "${LLVM_BUILD_DIR}" check-all
 fi
 
 # After everything is done, log success for this revision.
 echo "${PACKAGE_VERSION}" > "${STAMP_FILE}"