Getting Started with ARC Open Source on Linux

A small set of shared objects can be built which are part of ARC currently. A fully running system cannot currently be built.

To Check Out:

Run

 git clone --recursive \
        https://chromium.googlesource.com/arc/arc

Prerequisites for Building:

You must be building on Linux and have Ubuntu 14.04.
Install depot_tools: http://dev.chromium.org/developers/how-tos/install-depot-tools
CAVEAT: depot_tools has an executable called ninja. You might have an Ubuntu package ninja installed on your system, that is not the same thing.
Run src/build/install-build-deps.sh to make sure your dependencies are up to date. The script supports Ubuntu 14.04 officially.
```
  $ ./src/build/install-build-deps.sh
```
Run the configure script. Arguments to this script indicate the build target and what experimental code you want to be using. Note that the fewer options you pass, the more tested the code you are running. The configure script will be rerun automatically by ninja when it detects a dependency has changed. Also note that configure will download and keep synchronized a number of SDKs and test suites that we use in development.
If you want to build ARC for Bare Metal (i686), use:
```
  $ ./configure
```
If you want to build ARC for NaCl (x86-32), use:
```
  $ ./configure --target=nacl_i686
```
If you want to build ARC for NaCl (x86-64), use:
```
  $ ./configure --target=nacl_x86_64
```
If you want to build ARC for Bare Metal (arm), use:
```
  $ ./configure --target=bare_metal_arm
```

To Build:

$ ninja

To Clean:

$ ninja -t clean

Resulting Binaries:

Shared objects from this build will be available in out/target/$TARGET/lib.

Testing a Change:

It is possible to make changes to the code and test them on a Chromebook. Here are the instructions:

Switch your Chromebook into dev mode.
Download the App Runtime for Chrome onto the Chromebook by installing an ARC app.
Synchronize your open source checkout with the version of the App Runtime for Chrome your are modifying. For instance if you are modifying version 38.4410.120.9 of the ARC Runtime, check out the arc-runtime-38.4410.120.9 tag in the git repository.
Make a change to some code. For instance, add a message that is printed out whenever localtime is called. Edit localtime.c in mods/android/bionic and add the line below to localtime_r function:
write(1, “#### Here in localtime!!!!\n”, 27);
Run configure with the architecture appropriate to your Chromebook. For x86-based Chromebooks use -t=bi. For ARM-based Chromebooks use -t=ba.
Run ninja to build your changes.
Copy all affected libraries from out/target/bare_metal_{arm,i686} to a USB device or cloud storage. For the example change above, you would copy libc.so.
Open the shell on your Chromebook and change to the extension directory of the App Runtime for Chrome. The extension ID is shown in the chrome:extensions view. For the given version of the runtime above, the directory is Extensions/mfaihdlpglflfgpfjcifdjdjcckigekc/38.4410.120.9_0.
Copy the built libraries from our ARC open source checkout to the platform_specific/bare_metal{arm,i686} directory.
Run an app with the new runtime. You should see the effects of your new library. In the above example you would be able to see the stdout output appear in /var/log/ui/ui.LATEST file when the ARC runtime starts.