###################
Installing Solidity
###################

Browser-Solidity
================

If you just want to try Solidity for small contracts, you
can try `browser-solidity <https://ethereum.github.io/browser-solidity>`_
which does not need any installation. If you want to use it
without connection to the Internet, you can also just save the page
locally or clone http://github.com/ethereum/browser-solidity.

npm / Node.js
=============

This is probably the most portable and most convenient way to install Solidity locally.

A platform-independent JavaScript library is provided by compiling the C++ source
into JavaScript using Emscripten for browser-solidity and there is also an npm
package available.

To install it, simply use

::

    npm install solc

Details about the usage of the Node.js package can be found in the
`solc-js repository <https://github.com/ethereum/solc-js>`_.

Binary Packages
===============

Binary packages of Solidity together with its IDE Mix are available through
the `C++ bundle <https://github.com/ethereum/webthree-umbrella/releases>`_ of
Ethereum.

Building from Source
====================

Building Solidity is quite similar on MacOS X, Ubuntu and probably other Unices.
This guide starts explaining how to install the dependencies for each platform
and then shows how to build Solidity itself.

MacOS X
-------


Requirements:

- OS X Yosemite (10.10.5)
- Homebrew
- Xcode

Set up Homebrew:

.. code-block:: bash

    brew update
    brew upgrade

    brew install boost --c++11             # this takes a while
    brew install cmake cryptopp miniupnpc leveldb gmp libmicrohttpd libjson-rpc-cpp
    # For Mix IDE and Alethzero only
    brew install xz d-bus
    brew install homebrew/versions/v8-315
    brew install llvm --HEAD --with-clang
    brew install qt5 --with-d-bus          # add --verbose if long waits with a stale screen drive you crazy as well

Ubuntu 16.04
------------

Below are the instructions to install the minimal dependencies required
to compile Solidity on Ubuntu 16.04 (Xenial Xerus).

One of the dependencies (Crypto++ Library, with version >= 5.6.2) can be
installed either by adding the Ethereum PPA (Option 1) or by backporting
``libcrypto++`` from Ubuntu Development to Ubuntu Xenial

.. note::

    These dependencies are not enough to compile the GUIs (Alethzero and Mix)

.. code-block:: bash

    sudo apt-get -y install build-essential git cmake libgmp-dev libboost-all-dev \
        libjsoncpp-dev libleveldb-dev libcurl4-openssl-dev libminiupnpc-dev \
        libjsonrpccpp-dev libmicrohttpd-dev
    
    # (Option 1) For those willing to add the Ethereum PPA:
    sudo add-apt-repository -y ppa:ethereum/ethereum
    sudo add-apt-repository -y ppa:ethereum/ethereum-dev
    sudo apt-get -y update
    sudo apt-get -y upgrade
    sudo apt-get -y install libcryptopp-dev
    
    ## (Option 2) For those willing to backport libcrypto++:
    #sudo apt-get -y install ubuntu-dev-tools
    #sudo pbuilder create
    #mkdir ubuntu
    #cd ubuntu
    #backportpackage --workdir=. --build --dont-sign libcrypto++
    #sudo dpkg -i buildresult/libcrypto++6_*.deb buildresult/libcrypto++-dev_*.deb
    #cd ..

Building
--------

Run this if you plan on installing Solidity only:

.. code-block:: bash

    git clone --recursive https://github.com/ethereum/webthree-umbrella.git
    cd webthree-umbrella
    ./webthree-helpers/scripts/ethupdate.sh --no-push --simple-pull --project solidity # update Solidity repo
    ./webthree-helpers/scripts/ethbuild.sh --no-git --project solidity --cores 4 -DEVMJIT=0 -DETHASHCL=0 # build Solidity only

If you opted to install Alethzero and Mix:

.. code-block:: bash

    git clone --recursive https://github.com/ethereum/webthree-umbrella.git
    cd webthree-umbrella && mkdir -p build && cd build
    cmake ..

If you want to help developing Solidity,
you should fork Solidity and add your personal fork as a second remote:

.. code-block:: bash

    cd webthree-umbrella/solidity
    git remote add personal git@github.com:username/solidity.git

Note that webthree-umbrella uses submodules, so solidity is its own git
repository, but its settings are not stored in ``.git/config``, but in
``webthree-umbrella/.git/modules/solidity/config``.