Installing V8JS extension for PHP 8.0 on Ubuntu 20.x

ubuntu20-php8-v8js-setup.sh

apt-get update

# Install dependencies
apt-get install -y --no-install-recommends \
    libtinfo5 libtinfo-dev \
    build-essential \
    curl \
    git \
    libglib2.0-dev \
    libxml2 \
    python \
    patchelf

# Start building v8
cd /tmp 
git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git --progress --verbose
export PATH="$PATH:/tmp/depot_tools" 
fetch v8
cd v8
git checkout 9.9.115.7
gclient sync
tools/dev/v8gen.py -vv x64.release -- is_component_build=true use_custom_libcxx=false

cd /tmp/v8
ninja -C out.gn/x64.release/
mkdir -p /opt/v8/lib && mkdir -p /opt/v8/include
cp out.gn/x64.release/lib*.so out.gn/x64.release/*_blob.bin out.gn/x64.release/icudtl.dat /opt/v8/lib/
cp -R include/* /opt/v8/include/
apt-get install patchelf
for A in /opt/v8/lib/*.so; do patchelf --set-rpath '$ORIGIN' $A;done


# Fetch and build v8js
cd /tmp
git clone https://github.com/phpv8/v8js.git
cd v8js
git checkout php8 && git pull
phpize
./configure --with-v8js=/opt/v8 LDFLAGS="-lstdc++" CPPFLAGS="-DV8_COMPRESS_POINTERS"
make
make test
make install

# Finally, add this to mods-available, and enable it
echo "extension=v8js.so" > /etc/php/8.0/mods-available/v8js.ini
phpenmod -v 8.0 v8js