path: root/00-Building.cygwin.txt

Guide to Building HandBrake svn2213 (2009030301) on Cygwin
**********************************************************

Table of Contents
*****************

1 Introduction
2 Prerequisites
3 QuickStart
4 Overview
5 Building via Terminal
  5.1 Checkout Sources
  5.2 Configure
  5.3 Build
  5.4 Make Targets
    5.4.1 Global
    5.4.2 General Modules
    5.4.3 Contrib Modules
    5.4.4 Contrib Aggregates
  5.5 Customizing Make


1 Introduction
**************

This guide documents the recommended process to build HandBrake on
Cygwin hosts from the official source-code repository. Building from
any other source is not supported.

2 Prerequisites
***************

The following are the recommended specifications for building on
Cygwin; but is not necessarily the only configuration that is possible:

   * Intel 32-bit or 64-bit hardware (only 32-bit product binaries are
     supported)

   * Cygwin, gcc 4.2.4

   * yasm 0.7.2.2153 (for i386 or x86_64 architectures)

     Note: It is recommended to use the platform distribution's bundled
     compiler for maximum C++ compatibility. If you build with a custom
     compiler it will likely introduce non-standard runtime
     requirements. There are of course many valid reasons to build with
     unbundled compilers, but be aware it is generally unsupported and
     left as an exercise to the reader.

     Note: As of this writing, Cygwin has available to it several
     versions of gcc; only one of which may be found and used in the
     path as `gcc' and `g++'. Configure will thus find what is probably
     the older version of gcc in a typical Cygwin environment. If you
     desire to build with the newer gcc, it is found in the path as
     `gcc-4' and `g++-4' respectively and you must indicate to
     configure the desired versions. The following syntax should do the
     trick:

     ../configure --gcc=gcc-4

The following general tools are used on various platforms and it is
recommended you use these versions or similar:

   * subversion - 1.5.5

   * python - Python 2.4.6

   * curl - curl 7.19.3 (or wget)

   * m4 - GNU M4 1.4.6

   * make - GNU Make 3.81

   * patch - Patch 2.5.8

   * tar - GNU tar 1.15.1

   * wget - GNU Wget 1.11.4 (or curl)

3 QuickStart
************

This chapter is for building from a terminal/shell environment in as
few commands as possible. If more flexibility is required you should
skip this chapter and jump to *Note overview::.

     svn checkout svn://svn.handbrake.fr/HandBrake/trunk hb-trunk
     cd hb-trunk
     ./configure --launch

The special option `--launch' selected launch mode and performs the
following steps:

   * assert scratch directory `build/' does not exist

   * create scratch directory `build/'

   * change to directory `build/'

   * launch `make'

   * capture build output to `build/log.txt'

   * echo build output

4 Overview
**********

Cygwin builds are performed from a terminal. There is no support for
building from any IDEs.

5 Building via Terminal
***********************

5.1 Checkout Sources
====================

Checkout HandBrake from the official source-code repository.

     svn checkout svn://svn.handbrake.fr/HandBrake/trunk hb-trunk
     cd hb-trunk

Sources are checked out from the `trunk' branch. This document was
generated from that very branch, and for example purposes, we will use
exactly the same branch.

If you have write-access to the repository, then you may add the
appropriate login/password information as needed. It is recommended to
use Subversion 1.5.0 or higher. Lower versions should also work.

5.2 Configure
=============

Configure the build system.

     rm -fr build/
     mkdir build/
     cd build/
     ../configure

Create a scratch directory which will contain all files created during
the build process. The directory name is arbitrary but we recommend
something simple and descriptive. One directory is required for each
distinctly configured build. We name our directory `build' for example
purposes.

The `configure' utility accepts many options. It is recommended that
you specify `--help' for the complete list of options. The following
options are also documented here:

`--help'
     List available options.

`--prefix=PREFIX'
     Specify destination directory for final product install.  This
     defaults to a reasonable platform-specific value.

`--disable-xcode'
     Disable driving the build through Xcode. If this option is
     disabled only `HandBrakeCLI' will be produced and Xcode will not
     be invoked. Mac OS X only.

`--disable-gtk'
     Disable building the GTK GUI on applicable platforms such as
     Linux.

`--debug=MODE'
     Select debug mode. Must be one of `none', `min', `std', `max'.
     This generally maps to gcc options `-g0', `-g1', `-g2', `-g3'.

`--optimize=MODE'
     Select optimize mode. Must be one of `none', `speed', `size'.
     This generally maps to gcc options `-g0', `-O0', `-O3', `-Os'.

`--arch=MODE'
     Select build architecture. The available architectures vary by
     platform. Most platforms support exactly one architecture except
     Mac OS X which has support for various universal binary
     architectures. The available choices are hard-coded per platform
     and no sanity checks for the required tools are performed.

`--gcc=EXE'
     Specify the `gcc' executable to use where EXE is the executable
     name which is either absolute or environment `PATH' is searched
     accordingly.

Clean-room procedures dictate that when certain factors change, old
builds should be scrapped and new builds configured. This is the main
reason for requiring a scratch directory; to promote consistent,
reliable and clean software builds. The following is a short list of
some of the reasons why someone may choose to scrap an existing build:

   * configure with different options

   * subversion working dir is updated and you want configure to
     re-evaluate working dir metadata.

   * build corruption is suspected

There are generally two methods for scrapping a build. The `build'
directory can be recusrively removed which has the effect of loosing
your existing configuration but does guarantee no residuals are left
behind. The other method is to ask the build system to perform an `make
xclean'. This is known to work well but will leave empty directories
behind. However, the configuration is left intact.

5.3 Build
=========

Build main product. All necessary dependencies are also built if
required.

     make

Parallel builds may optionally be enabled. Be aware that while a
parallel build may save time on systems with additional cores, the
output is often mixed, overlapped and sometimes even corrupted with
binary characters. Thus if you experience a build issue, you should
clean and redo the build in default serial mode to produce a readable
log. The following command allows for up to 4 concurrent jobs via make:

     make -j4

5.4 Make Targets
================

The build system supports passing many kinds of targets some of which
become very useful in normal development cycles. The targets by
convention are lower-case words passed to `make'. Global targets are
one-word targets. Scoped targets are usually two-words seperated by a
period.

5.4.1 Global
------------

`make'
     Alias for `make build'.

`make build'
     Build main product. All necessary dependencies are also built if
     required.

`make clean'
     Clean all build output excluding contrib modules. Configuration is
     retained.

`make install'
     Perform final product(s) install.  This will install build
     products to a standard directory or one specified via `configure
     --prefix' option.

`make uninstall'
     Perform final product(s) uninstall.  This will uninstall any
     products which may have been previously installed.

`make xclean'
     Clean all build output including contrib modules. Configuration is
     retained.

`make doc'
     Build auto-generated project documentation. Various articles are
     produced and may be found in `build/doc/articles'.

5.4.2 General Modules
---------------------

General modules such as `libhb', `test' and `gtk' have the following
scoped targets:

`make MODULE.build'
     Build MODULE.

`make MODULE.clean'
     Clean build output for MODULE.

5.4.3 Contrib Modules
---------------------

Contrib modules such as `a52dec', `bzip2', `faac', `faad2', `ffmpeg',
`lame', `libdca', `libdvdread', `libmkv', `libmp4v2', `libogg',
`libsamplerate', `libtheora', `libvorbis', `mpeg2dec', `x264',
`xvidcore' and `zlib' have the following scoped targets:

`make MODULE.fetch'
     Download source tarball from the Internet and save to
     `TOP/downloads' directory. No checksumming is performed.

`make MODULE.extract'
     Extract source tarball into `build' tree.

`make MODULE.patch'
     Apply appropriate patches (if any) to module sources.

`make MODULE.configure'
     Configure module sources.  This usually invokes autotool configure.

`make MODULE.build'
     Build module.  This usually invokes autotool build.

`make MODULE.install'
     Install module products such as headers and libraries into `build'
     tree.  This usually invokes autotool install.

`make MODULE.uninstall'
     Uninstall module products; generally the reverse of install.  This
     usually invokes autotool uninstall.

`make MODULE.clean'
     Clean module; generally the reverse of build.  This usually
     invokes autotool clean.

`make MODULE.xclean'
     Extra clean module; first invokes uninstall then recursively
     removes the module build directory.

5.4.4 Contrib Aggregates
------------------------

For convenience, the following targets aggregate the all contrib
modules' respective targets together:

   * make contrib.fetch

   * make contrib.extract

   * make contrib.patch

   * make contrib.configure

   * make contrib.build

   * make contrib.install

   * make contrib.uninstall

   * make contrib.clean

   * make contrib.xclean

5.5 Customizing Make
====================

If the need arises to override settings in the build system
(essentially gnu-make variables) the recommended method is to
create/edit the optional include file `build/GNUmakefile.custom' which
sits adjacent to the top-level makefile. Do not check this file into
the respository. The sole purpose is to allow a place to store local
build settings for testing, tweaking, and experimenting with build
configuration without losing your settings if `configure' is invoked;
ie: `configure' would overwrite `GNUmakefile' and any customizations
contained therein would be lost. Here is a short example of what the
contents of `build/GNUmakefile.custom' might contain:

     ## bump to gcc-4.2 in current path
     GCC.gcc = gcc-4.2

     ## replace optimize for 'speed' with more agressive settings
     GCC.args.O.speed = -O3 -fomit-frame-pointer -msse4.2