Getting Started/Build/Windows/emerge

emerge is a tool to build the KDE sources and its third party requirements on MS Windows. It is the easy way to build KDE on MS Windows.

Set up

Create a directory if possible in your harddrive's root e.g. C:\kderoot or D:\kderoot (You will need this PATH later). This directory will contain the whole kde installation later.

emerge.bat invokes an emerge.py script written in Python, so you first need to install a Python Interpreter.

The latest source code for windows emerge and the rest of KDE is stored in a Subversion repository. You need a subversion client for the first checkout.

Check out the sources from the svn-directory of emerge into a new directory, which in this example we will call kderoot. If you have Subversion command-line tool, you can accomplish this with the following command:

svn co svn://anonsvn.kde.org/home/kde/trunk/kdesupport/kdewin32/emerge

Alternatively, you can checkout the sources using a program like TortoiseSVN.

Be sure to use a copy of Subversion that was built on Windows so that checked-out files do not use UNIX line endings. If you check out with UNIX line endings, the patch program will fail when attempting to apply a patch whose line endings don't match the system's.

After checkout you need to have directory kderoot\emerge else you can copy your emerge directory to that location.

Create the directory kderoot\etc. Copy the file kderoot\emerge\kdesettings-example.bat to kderoot\etc\kdesettings.bat and change it according to your needs. Then run it.

Be sure that you neither have the msys/bin nor the cygwin/bin in your path. If so you have to definitely remove it.

Compiling

emerge uses either the MinGW ("Minimalist GNU for Windows") GCC compiler and tools to build Qt and KDE from source code or one of the Microsoft Compilers (> Visual Studio 2003).

Currently, there is no dependency on the compilers in any of the packages. So, unless you call emerge mingw manually, have the compiler installed and in your path or alter the environment configuration scripts to add your existing MinGW bin directory to the PATH variable, compiling anything will choke. If you run emerge mingw, you will not need to modify the environment configuration scripts to point to a custom location.

If you see an error about cc1plus not being found, either add MinGW's \libexec\gcc\mingw32\3.4.5 to your PATH (in command line set PATH=%PATH%;path\to\directory) variable or copy the contents of this directory to MinGW's bin directory. The prior is preferred.

Everything applies to MS Visual Studio Compilers in a similar manner.

In vista, the mingw directory may need to be moved to c:\ in order to compile properly.

Running emerge

Start a console window and run

C:\kderoot\emerge\kdeenv.bat

Check your path (run: echo %PATH%), it should have python and various directories within kderoot in it.

You can get 'some' help if you run:

C:\kderoot\emerge\bin>emerge --help

Below the directory kderoot\emerge\portage are subdirectories for categories as subdirectories which contain the instructions for individual packages. The emerge script automatically handles package dependencies (except for the compiler, see #Compiling).

To build every required package for e.g. kdebase enter emerge kdebase. If you want to make a dry run, add the option -p to it.

Start with emerge qt and if that completes successfully, run emerge [TARGET] where [TARGET] has to be replaced with the target you want to build.

What emerge does

emerge will fetch Windows versions of numerous UNIX-like utilities and libraries from the Internet, putting them in kderoot\bin, then get the Win32 support files, then Subversion, then Perl and the Qt libraries, etc.

Then emerge compiles the Qt libraries, this takes hours.

emerge package performs the separate actions --fetch, --unpack, --compile, --install, --manifest, and --qmerge.

emerge commandline options / emerge settings

There are some options that can be used when building with emerge.

-v	EMERGE_VERBOSE		This option augments the verbosity level - currently the highest verbosity level is 3 (-v -v -v). A verbosity level of 0 should give no output and equals to -q. You can set EMERGE_VERBOSE=3 instead in the environment of the commandline or within your kdesettings.bat file.
--nocopy	EMERGE_NOCOPY		This very useful option suppresses copying the sources from the local subversion tree to a directory within the build directory. It shouldn't be used while packaging; in the other cases it reduces the amount of harddisk used though and removes the copying time.You can set EMERGE_NOCOPY=True or =False instead.
--offline			This option suppresses the update step of the local tree - which needs some time. Be aware though that you have to have existing sources already if you want to use this option.
-t	EMERGE_BUILDTESTS		This option enables or disables KDE4 buildtests for KDE modules. Other packages will not change. Use EMERGE_BUILDTESTS=True or =False.

Notes

emerge is mostly usable together with the kdewin-installer but we're currently still working on some packages which are packaged in a wrong way. It is not recommended to use another layout then installer for directory_layout in the kdesettings.bat anymore (see that file for more detailed information).

emerge creates lots of files in \kderoot\tmp during build. After a package is successfully installed (check \kderoot\etc\portage\installed), you can delete its temporary directory.

emerge is derived from the Gentoo portage system, that has documentation for the portage format and emerge program.