Build Javet from Scratch

Build V8

Please follow the official guide to build V8. If you face any issues, you may contact @sjtucaocao.

Prepare V8

• Clone the source code.

• Checkout a proper version.

Also, please make sure args.gn file looks like the following.

is_debug = false
target_cpu = "x64"
v8_monolithic = true
v8_use_external_startup_data = false
is_component_build = false
v8_enable_i18n_support = false
v8_enable_pointer_compression = false
v8_static_library = true
symbol_level = 0
use_custom_libcxx = false
v8_enable_sandbox=false

Note

• To enable i18n support, please set v8_enable_i18n_support = true.

Build V8 for Linux

export PATH=${DEPOT_TOOLS_HOME}:$PATH
cd ${V8_HOME}
ninja -C out.gn/x64.release v8_monolith
python3 ${JAVET_HOME}/scripts/python/patch_v8_build.py -p ./
ninja -C out.gn/x64.release v8_monolith

Build V8 for Mac OS

export PATH=${DEPOT_TOOLS_HOME}:$PATH
cd ${V8_HOME}
ninja -C out.gn/x64.release v8_monolith

Build V8 for Windows

Caution

The patch script requires Python 3.

set PATH=%DEPOT_TOOLS_HOME%;%PATH%
set DEPOT_TOOLS_WIN_TOOLCHAIN=0
cd %V8_HOME%
ninja -C out.gn/x64.release v8_monolith
python %JAVET_HOME%\scripts\python\patch_v8_build.py -p .\
ninja -C out.gn/x64.release v8_monolith
gn gen --ide=vs out.gn\x64.solution

Build V8 for Android

export PATH=${DEPOT_TOOLS_HOME}:$PATH
cd ${V8_HOME}
python3 tools/dev/v8gen.py arm.release -- 'target_os="android"' 'target_cpu="arm"' 'v8_target_cpu="arm"' v8_monolithic=true v8_use_external_startup_data=false is_component_build=false v8_enable_i18n_support=false v8_enable_pointer_compression=false v8_static_library=true symbol_level=0 use_custom_libcxx=false v8_enable_sandbox=false
ninja -C out.gn/arm.release v8_monolith
python3 ${JAVET_HOME}/scripts/python/patch_v8_build.py -p ./
ninja -C out.gn/arm.release v8_monolith
python3 tools/dev/v8gen.py arm64.release -- 'target_os="android"' 'target_cpu="arm64"' 'v8_target_cpu="arm64"' v8_monolithic=true v8_use_external_startup_data=false is_component_build=false v8_enable_i18n_support=false v8_enable_pointer_compression=false v8_static_library=true symbol_level=0 use_custom_libcxx=false v8_enable_sandbox=false
ninja -C out.gn/arm64.release v8_monolith
python3 ${JAVET_HOME}/scripts/python/patch_v8_build.py -p ./
ninja -C out.gn/arm64.release v8_monolith
python3 tools/dev/v8gen.py ia32.release -- 'target_os="android"' 'target_cpu="x86"' 'v8_target_cpu="x86"' v8_monolithic=true v8_use_external_startup_data=false is_component_build=false v8_enable_i18n_support=false v8_enable_pointer_compression=false v8_static_library=true symbol_level=0 use_custom_libcxx=false v8_enable_sandbox=false
ninja -C out.gn/ia32.release v8_monolith
python3 ${JAVET_HOME}/scripts/python/patch_v8_build.py -p ./
ninja -C out.gn/ia32.release v8_monolith
python3 tools/dev/v8gen.py x64.release -- 'target_os="android"' 'target_cpu="x64"' 'v8_target_cpu="x64"' v8_monolithic=true v8_use_external_startup_data=false is_component_build=false v8_enable_i18n_support=false v8_enable_pointer_compression=false v8_static_library=true symbol_level=0 use_custom_libcxx=false v8_enable_sandbox=false
ninja -C out.gn/x64.release v8_monolith
python3 ${JAVET_HOME}/scripts/python/patch_v8_build.py -p ./
ninja -C out.gn/x64.release v8_monolith

Why Patching V8?

A few ninja files set certain warnings as errors so that MSVC stops compilation. The patch is to turn off those errors.

Build Node.js

Please follow Building Node.js to build the static and LTS version of Node.js libraries.

Prepare Node.js

• Clone the source code.

• Checkout a proper version.

Build Node.js on Linux

Caution

The patch script requires Python 3.

cd ${NODE_HOME}
python3 ${JAVET_HOME}/scripts/python/patch_node_build.py -p ${NODE_HOME}
./configure --enable-static --without-intl
python3 ${JAVET_HOME}/scripts/python/patch_node_build.py -p ${NODE_HOME}
make -j4

Why Patching Node.js?

• First patch: All static node libraries are <thin> libraries. The patch is to disable <thin>.

• Second patch: Many static node libraries are not compiled to position independent code and link phase is broken with the following error. The patch is to set -fPIC to those make files.

  /usr/bin/ld: /....../out/Release/libnode.a(node_binding.o): relocation R_X86_64_TPOFF32 against _ZN4nodeL23thread_local_modpendingE can not be used when making a shared object; recompile with -fPIC

Build Node.js on Mac OS

cd ${NODE_HOME}
./configure --enable-static --without-intl
make -j4

Build Node.js on Windows

cd %NODE_HOME%
vcbuild.bat static without-intl vs2019

Caution

Node.js v18 is not compatible with Visual Studio 2022 for now.

Build Javet

Once Node.js and V8 are ready, please proceed with Build Javet with Pre-built Binaries.