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# V8 MapScript Support

Author

  Alan Boudreault

Contact

  aboudreault@mapgears.com

Table of Contents

- V8 MapScript Support

  - Introduction

  - Obtaining, Compiling, and Installing V8 and V8/MapScript

## Introduction

The V8/MapScript cannot be used as its own like other mapscripts. V8 is currently used internally to add 2 functionalities:

- Javascript Styleitem: MS RFC 102: Support of Styleitem JavaScript Plugin

- Javascript Geomtransform: MS RFC 106: Support of Geomtransform JavaScript Plugin

These instructions are for Unix/Linux users.

### Version of V8 supported

You have to use v8 3.20, which is the version of the nodejs release:0.11.7. For future compatibility, this is a good thing to be synchronized to nodejs project.

## Obtaining, Compiling, and Installing V8 and V8/MapScript

### Download and Compile V8

- The V8 source can be obtained from the v8 website.

Download v8:

    git clone git://github.com/v8/v8.git v8

Compile the v8 library:

    cd v8
    git checkout 3.20
    make dependencies
    library=shared make -j8 x64.release

Note

Use ia32.release if you are using a 32bits machine.

Install the v8 library and include headers:

    mkdir -p /opt/v8/lib && cp ./out/x64.release/lib.target/libv8.so /opt/v8/lib
    mkdir /opt/v8/include && cp include/v8* /opt/v8/include

Note

Modify the library path if needed (32bits)

Setup the v8 lib in the system paths:

    echo "/opt/v8/lib" > /etc/ld.so.conf.d/v8.conf
    ldconfig

### Compile MapServer with V8 Support

Configure:

    cd mapserver
    mkdir build
    cd build
    cmake -DCMAKE_PREFIX_PATH=/opt/v8 -DWITH_V8=yes ..

Compile and install: (from the build directory)

    make install

Verify the V8 support:

    /path/to/mapserv -v

You should see: SUPPORTS=V8. You can now refer to the following pages to try the javascript functionalities:

- Javascript Styleitem: STYLEITEM Javascript

- Javascript Geomtransform: Javascript transformation