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V8.md

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Fetching, Building and Installing V8 (On Ubuntu 16.04 x64 or later)

The following instructions fetch the Google V8 JavaScript engine to your local machine and configure it to create static libraries in the location where the MultiChain build system expects to find them.

MultiChain uses V8 version 6.8, and requires at least 4 GB of RAM to build in a reasonable time. It will not build at all with less than 2 GB RAM.

Install dependencies

sudo apt-get update
sudo apt-get -y install git python pkg-config build-essential

Clone Google's depot_tools

Google's depot_tools are used by the Google build system to manage Git checkouts.

git clone --depth=1 https://chromium.googlesource.com/chromium/tools/depot_tools.git
export PATH=${PATH}:$(pwd)/depot_tools

Fetch V8

The following commands check out V8 and select the branch used by MultiChain. Please note that this step downloads about 2 GB of data, and can take a long time (30 minutes or more).

gclient
fetch v8
cd v8
git checkout 6.8.290

Configure and build V8

The V8 build system currently uses a proprietary version of the Ninja build system, called GN. It is part of the depot_tools installed earlier.

find . -name BUILD.gn -exec sed -i '/exe_and_shlib_deps/d' {} \;
tools/dev/v8gen.py x64.release
RELEASE=out.gn/x64.release
cat > $RELEASE/args.gn << END
is_debug = false
target_cpu = "x64"
is_component_build = false
v8_static_library = true
use_custom_libcxx = false
use_custom_libcxx_for_host = false
END

The selected release of the V8 sources requires relaxing two compiler checks to prevent compilation errors.

  • Open the file build/config/compiler/BUILD.gn in your favorite editor.

  • Locate the folllowing lines (currently at 1464):

    if (is_clang) {
  cflags += [

  • Add the following two lines to the end of the block and save the file:

    "-Wno-defaulted-function-deleted",
"-Wno-null-pointer-arithmetic",

Build the V8 libraries:

gn gen $RELEASE
ninja -C $RELEASE v8 d8

Create an additional library embedding the V8 initial snapshot blobs:

sudo easy_install pip
pip install pathlib2
cd $RELEASE
python $MULTICHAIN_HOME/depends/v8_data_lib.py