This clone includes changes to make Python (including some additional modules)
work well in the NaCl standalone sandbox.
webports is collection of open source libraries and applications that have been ported to Native Client, along with set to tools for building and maintaining them.
Packages can be built from source or prebuilt binaries packages can be downloaded from the continuous build system.
The sources for the ports live in the ports directory. Each one
contains at least the following file:
pkg_info: a description of the package.
Most also contain the follow optional files:
build.sh: a bash script for building itnacl.patch: an optional patch file.
The tools for building packages live in bin. The binary tool is simple
called webports. To build and install a package into the toolchain
run webports install <package_dir>. This script will download, patch,
build and install the application or library. By default it will first
install any dependencies that that the package has.
- Git: https://chromium.googlesource.com/webports.git
- Bugs: https://bugs.chromium.org/p/naclports/issues/list
- Continuous builder: http://build.chromium.org/p/client.nacl.ports/
- Continuous build artifacts: http://gsdview.appspot.com/webports/builds/
The minimum requirements for using webports are:
- python 2.7
- python-dev
- gclient (from depot_tools)
- Native Client SDK
For building packages from source the build scripts require that certain tools are present in the host system:
- bash
- make
- curl
- sed
- git
To build all ports you will also need these:
- cmake
- texinfo
- gettext
- pkg-config
- autoconf, automake, libtool
- libglib2.0-dev >= 2.26.0 (if you want to build glib)
- xsltproc
On Mac OS X you can use homebrew to install these using the following command:
$ brew install autoconf automake cmake gettext libtool pkg-config
The build system for some of the native Python modules relies on a 32-bit host build of Python itself, which in turn relies on the development version of zlib and libssl being available. On 64-bit Ubuntu/Trusty this means installing:
- zlib1g-dev:i386
- libssl-dev:i386
On older Debian/Ubuntu systems these packages were known as:
- lib32z1-dev
- libssl1.0.0:i386
The following 32-bit packages are also needed in order to run some of the 32-bit binaries in the NaCl SDK:
- libstdc++6:i386
- libglib2.0-0:i386
Although the code is stored in git webports uses gclient to manage
the checkout of dependencies. You will need to
install depot_tools
in order to use gclient.
Use the following steps to correctly checkout webports:
- Create a directory:
$ mkdir webports
$ cd webports
- Create a .gclient Configuration:
$ gclient config --unmanaged --name=src \
https://chromium.googlesource.com/webports.git
- Sync the code and dependencies:
$ gclient sync --with_branch_heads
- Optionally Checkout the relevant branch. The master branch is designed to be used with pepper_canary. For older SDK versions switch the corresponding pepper_XX branch, e.g:
$ cd src
$ git checkout -b pepper_49 origin/pepper_49
$ gclient sync
Before you can build any of the package you must set the NACL_SDK_ROOT
environment variable to top directory of a version of the Native Client
SDK (the directory containing toolchain/). This path should be absolute.
The top level Makefile can be used as a quick way to build one or more
packages. For example, make libvorbis will build libvorbis and
libogg. make all will build all the packages.
There are 4 possible architectures that NaCl modules can be compiled
for: i686, x86_64, arm, pnacl. The webports build system will only
build just one at at time. You can control which one by setting the
NACL_ARCH environment variable. e.g.:
$ cd src
$ NACL_ARCH=arm make openssl
For some architectures there is more than one toolchain available. For
example for x86 you can choose between clang-newlib and glibc. The
toolchain defaults to pnacl and can be specified by setting the
TOOLCHAIN environment variable:
$ NACL_ARCH=i686 TOOLCHAIN=glibc make openssl
If you want to build a certain package for all architectures and all
toolchains you can use the top level make_all.sh script. e.g.:
$ ./make_all.sh openssl
Headers and libraries are installed into the toolchains directly so there is not add extra -I or -L options in order to use the libraries.
The source code and build output for each package is placed in:
out/build/<PACKAGE_NAME>
By default all builds are in release configuration. If you want to build
debug packages set NACL_DEBUG=1 or pass --debug to the webports
script.
Note: Each package has its own license. Please read and understand these licenses before using these packages in your projects.
Note to Windows users: These scripts are written in bash and must be launched from a Cygwin shell. While many of the scripts should work under Cygwin, webports is only tested on Linux and Mac so YMMV.
By default webports will attempt to install binary packages rather than
building them from source. The binary packages are produced by the
buildbots and stored in Google cloud storage. The index of current
binary packages is stored in lib/prebuilt.txt and this is currently
manually updated by running build_tools/scan_packages.py.
If the package version does not match the package will always be built from source.
If you want to force a package to be built from source you can pass
--from-source to the webports script, or specify FROM_SOURCE=1
on the make command line.
The build system contains very early alpha support for building packages
with Emscripten. To do requires the Emscripten SDK to be installed and
configured (with the Emscripten tools in the PATH). To build for
Emscripten build with TOOLCHAIN=emscripten.
Applications/Examples that build runnable web pages are published to
out/publish. To run them in chrome you need to serve them with a web
server. The easiest way to do this is to run:
$ make run
This will start a local web server serving the content of out/publish
after which you can navigate to http://localhost:5103 to view the
content.
Happy porting!