Difference between revisions of "Getting Started/Build/Windows/emerge"

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''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.
{{Moved To Community|Guidelines and HOWTOs/Build from source/Windows}}
== Introduction ==
Emerge is a tool that can build the different parts of KDE and its dependencies under Windows. We created this tool to automate and simplify the build process under Windows. We try to build all packages that we offer in the KDE installer with emerge. That has some advantages for us:
* it is easy for people to join us:
Before emerge it was quite some work to set a system up for development. There were some quirks, which were documented in some mailing lists, but you had to remember them or you ran into an already solved problem again, etc.
Now to get a development machine you need a Windows computer, need to install Python and Subversion and do the emerge checkout. Then execute emerge to build what you want to build. This is easy for developers coming from Windows to KDE, and also for KDE developers coming to Windows.
* it is easy for us to do (nightly/continuous/release/reproducable/...) builds:
With emerge you can build the whole software stack (low-level libs, Qt, kdelibs, things above that) with only one command. You can start that build, and some hours later you can check if it worked, or if something broke. So we can spot problems easier and earlier. We can also start with a "naked" Windows computer without any other installed software and bootstrap kde on it. That ensures, that no hidden dependencies on some pieces of software sneak in, because then the builds on a "naked" computer would break and show the problem.
* it is easier to collaborate:
We can test the same emerge build description for a package on different Windows versions/computers before we do binary releases. People can also add build descriptions for new packages to the Subversion repository.
This emerge tool was inspired by the Gentoo emerge tool.
== Set up the environment ==
=== Root directory ===
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. We will refer to it as %KDEROOT%.
=== Python interpreter ===
<tt>emerge.bat</tt> invokes an <tt>emerge.py</tt> script written in [http://en.wikipedia.org/wiki/Python_%28programming_language%29 Python] programming language, so you first need to [http://www.python.org/download/ install the Python 2.6 Interpreter]. The ''python'' installation directory will be added to the PATH later by <tt>%KDEROOT%\etc\kdesettings.bat</tt> script.
=== Subversion client ===
The latest source code for Windows ''emerge'' and the rest of KDE is stored in a repository created and managed using the [http://subversion.tigris.org/ Subversion] version control tool. You need a Subversion client for the first checkout. There are at least two applications:
*a command line client, available at [http://subversion.apache.org/packages.html  subversion.apache.org] '''(required by emerge to get the source code from KDE Subversion repository)''', aimed at developers or power users accustomed with the command line,
*GUI program like [http://tortoisesvn.tigris.org/ TortoiseSVN], optional, useful for displaying differences between various versions of files in the repository in a graphical way.
Note 1: If you experience problems with the checkout of Qt (Subversion doesn't work correctly) please remove any other Subversion binaries out of the path that you do have. '''The different versions of the Apache portable runtime (APR) are incompatible!'''
Note 2: Make 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.
=== Getting the ''emerge'' tool ===
The source code of the ''emerge'' tool and the recipes for creating KDE packages are located at <tt>svn://anonsvn.kde.org/home/kde/trunk/kdesupport/emerge</tt>, which is an URL based on Subversion-specific ''svn'' protocol.
You need to check out the source code from the ''emerge'' Subversion directory into a new directory below your root directory (the root directory is normally called %KDEROOT% here).
==== Check out using the 'svn' command ====
*Option 1: With the ''svn'' command line tool, you can accomplish this with the following commands:<pre>cd %KDEROOT%</pre>
**if you will only use anonymous (read-only) access to the KDE svn repository:<pre>svn co svn://anonsvn.kde.org/home/kde/trunk/kdesupport/emerge</pre>
**or, if you plan to use write access (commit) to the KDE svn repository
***via https:<pre>svn co --username yourusername https://svn.kde.org/home/kde/trunk/kdesupport/emerge</pre>
***via a [[Getting_Started/Build/KDE4/Windows/subversion|puTTY tunnel]] using your existing account & OpenSSH private key: <pre>svn co svn+putty://svn.kde.org/home/kde/trunk/kdesupport/emerge</pre>
This would result with:
Error validating server certificate for '<nowiki>https://svn.kde.org:443</nowiki>':
  - The certificate is not issued by a trusted authority. Use the
    fingerprint to validate the certificate manually!
Certificate information:
  - Hostname: svn.kde.org
  - Valid: from Wed, 11 May 2005 09:08:21 GMT until Sat, 09 May 2015 09:08:21 GMT
  - Issuer: SVN, KDE e.V., Nuernberg, Bavaria, DE
  - Fingerprint: xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx
(R)eject, accept (t)emporarily or accept (p)ermanently?
enter ''p'' here to permanently accept the certificate:
Authentication realm: <<nowiki>https://svn.kde.org:443</nowiki>> KDE SVN account
Password for 'yourusername': ***************
A    emerge\kdeenv.bat
A    emerge\portage
A    emerge\portage\kdesupport
The password and cache for the certificates is saved in <tt>%APPDATA%\Subversion\auth</tt> directory.
==== Check out using the TortoiseSVN ====
*Option 2: If you use TortoiseSVN:
*#right-click on your %KDEROOT% folder and select ''SVN Checkout...'' command from the context menu,
*#paste <tt>svn://anonsvn.kde.org/home/kde/trunk/kdesupport/emerge</tt> URL into the ''URL of repository'' text box (replace with <tt><nowiki>https://svn.kde.org/home/kde/trunk/kdesupport/emerge</nowiki></tt> for read-write access)
*#add <tt>\emerge</tt> to the folder name in the ''Checkout directory'' box and click OK to continue
*#if you picked the read-write access, you will be asked for accepting the SSL certificate of the SVN server (click "Premanent") and then for username and password. For convenience select "Save authentication" checkbox too (the password and cache for the certificates will be saved in <tt>%APPDATA%\Subversion\auth</tt> directory).
After the checkout you should have the directory <tt>%KDEROOT%\emerge</tt>. If you don't, you move your ''emerge'' directory to that location.
=== Configure the ''emerge'' tool ===
# Create the directory <tt>%KDEROOT%\etc</tt>.
# Copy the file <tt>%KDEROOT%\emerge\kdesettings-example.bat</tt> as <tt>%KDEROOT%\etc\kdesettings.bat</tt> and change its contents according to your needs. The options are described in the ''rem'' lines in the file itself.
The kdesettings.bat script will be called by the main kdeenv.bat script.
Note 1: '''Be sure that you neither have the msys/bin nor the cygwin/bin in your path. If so you have to definitely remove it from the path.'''
Note 2 '''from a user: The applications gimp, inkscape and graphviz are also a problem. To make sure that there's nothing wrong I stripped my path to contain only what I needed to build.'''
Note 3 '''from another user: be careful when renaming the file to "kdesettings.bat" it is easy to end up with "kdesettings.bat.bat" instead of what you want since Windows(by default) will not show the the file extension part of a file.'''
=== [Optional, Advanced] emergehosts.conf ===
Add a file emergehosts.conf in the <tt>%KDEROOT%\etc</tt> directory. The format of this file is a typical config file with only two entries per section:
The first entry is the ''host'' as mentioned in the portage file for the package. The second entry is called ''replace'' and is the replace string for the host string.
As an example, here is how to checkout all gitorious based repos of the kde-developers group using a push url instead of the anonymous access:
[qt gitorious]
host: git://gitorious.org/+kde-developers/
replace: [email protected]:+kde-developers/
As a second example here is how to checkout with a ssh user from a subversion repository:
host: svn://svn.example.com/
replace: svn+ssh://[email protected]/
The name of the section doesn't matter and can be used for descriptions.
== Using emerge ==
To use emerge you need to start a console window and point that to <tt>%KDEROOT%\emerge</tt>. For example:
cd \%KDEROOT%\emerge
Then you have to execute
This tells emerge about your environment settings (e.g. paths). It will load your configuration from <tt>%KDEROOT%\etc\kdesettings.bat</tt>. It should not give any error messages, otherwise emerge will not work as expected. The output should look similar to this one (of course with your paths):
kdesettings.bat executed
KDEROOT    : C:\kderoot
KDESVNDIR  : C:\kderoot\svn
PYTHONPATH  : C:\python25
DOWNLOADDIR : C:\kderoot\download
Next, if you have configured your kdesettings.bat to use svn+ssh for your subversion checkout, then you need to run:
<code>plink <your-svn-username>@svn.kde.org</code>
This will prompt you to accept the fingerprint of the server, otherwise svn will hang forever when trying to download from the server.
Now you should be able to use emerge. Type
emerge --help
to get some help on usage.
''Note: There is a short path option in kdesettings which you will
need if you want to build Qt in a directory that has a pathlenght of
more then around 5 characters. This problem is due to limitations of the command line length and the Qt build system.''
== Setting up a compiler ==
Currently emerge supports both the MinGW and MS Visual C++ (msvc) compilers. We did not add dependencies for the compilers, so you have to make sure to install a compiler by yourself. There are three ways to set up a compiler for emerge.
We assumed you have set KDECOMPILER variable properly in the <tt>%KDEROOT%\etc\kdesettings.bat</tt>.
In the following sections you can find information on how to install or reuse an existing compiler.
=== Install the MinGW compiler with emerge ===
Let emerge install the MinGW compiler:
To install the MinGW ("Minimalist GNU for Windows") compiler with emerge, type
emerge mingw4
and wait until it is finished.
If you encounter an error like
Assertion failed: hunk, file ../patch-2.5.9-src/patch.c, line 354
try to edit line 51 of file <tt>mingw-x.y.z.py</tt> (<tt>%KDEROOT%\emerge\portage\dev-util\mingw</tt>) by adding the <tt>--binary</tt> after <tt>-p1</tt> parameter. The line should then look like this:
cmd = "cd %s && patch -p1 --binary < %s" % \
This is probably because the different line break types (Linux vs Dos) in the files and the bug in patch.exe. Althought this is an ugly hack and should be fixed somewhere else, it works for the current versions of patch (2.5.9) and mingw (3.4.5).
If you encounter an error like:
  IOError: [Errno 2] No such file or directory: 'c:\\kderoot\\bin\\mingwm10.dll'
Then try creating the c:\kderoot\bin directory first.
=== Install MS Visual C++ ===
Read [[../MS_Visual_Studio#The_Compiler|here]].
=== Point to an existing MinGW installation ===
* Point emerge to an existing MinGW installation:
'''This option is not recommended for now''', because it only adds one more point of failure, and does not gain something in comparison to the option above.<br/>NOTE from a user: be sure that path to \mingw\bin has been set correctly, by default it is pointing to: %KDEROOT%\mingw\bin which does not apply to most installations. If you see an error about <tt>cc1plus</tt> not being found, either add MinGW's <tt>\libexec\gcc\mingw32\3.4.5</tt> to your ''PATH'' (in command line <tt>set PATH=%PATH%;path\to\directory</tt>) variable or copy the contents of this directory to MinGW's <tt>bin</tt> directory.  The prior is preferred.<br/><br/>Under Vista, the mingw directory may need to be moved to c:\ in order to compile properly.
=== Point to an existing MS Visual C++ installation ===
You need to point emerge to an existing msvc installation. To do that, execute vcvarsall.bat before running <tt>%KDEROOT%\emerge\kdeenv.bat</tt>. In recent versions this is run automatically for you from kdeenv.bat if configured properly in kdesettings.bat. Check your kdesettings.bat file to know if you need to run this manually or not.
Notes related to Vista:
*Note that for debug builds MS Visual Studio 2005 Service Pack 1 is required due to the use of manifest files and using pre-built packages for some dependecies.
*Notes related to Vista: If you open the command prompt under Vista by right clicking and running as administrator, you don't get the UAC issues with Vista trying to unsuccesfully run patch as an installer in a seperate environment. You may want run Visual Studio with administrative rights anyway under Vista, as this is recommended by Microsoft (perhaps Visual Studio 2008 would not force you to do that...).
== Installing the base system ==
Once you have emerge and a compiler installed and working, try:
* <tt>emerge --help</tt> for a list of available commands
* <tt>emerge --print-installable</tt> to get a list of available packages
* <tt>emerge --print-installed</tt> to get a list of currently installed packages
You are now ready to start building KDE, it is recommended to do so progressively, relying on emerge to automatically resolve the required dependencies at each set step:
* Enter <tt>emerge qt</tt>.  This will fetch and install Windows versions of numerous UNIX-like utilities and libraries, then checkout, compile and install Qt.  This will take several hours.
* Enter <tt>emerge kdelibs</tt>.  This will checkout, compile and install the required kdesupport modules and then kdelibs.
* Enter <tt>emerge kdebase-apps</tt>. This will checkout, compile and install kdebase-runtime, and kdebase-apps
You will now have successfully installed a base KDE system and can now install other KDE modules as required.
Note that this will install the trunk version of KDE, if you wish to install a particular stable branch then you must prefix the KDE package names with the required version, i.e. <tt>emerge kde-4.5/kdelibs</tt>.  You can force emerge to always default to a given branch by setting the <tt>EMERGE_DEFAULTCATEGORY</tt> variable in your kdesettings.bat file.  You should not mix kde packages from different branches.
It is strongly recommened you do not choose to manually install any of the utilities and libraries yourself, as you may install the wrong version and cause installation failures.  Instead allow emerge to resolve the dependencies for you.
Every time you want to update or install a packake, you should first update your emerge checkout to ensure you are using the latest package recipies.
== What emerge does ==
'''emerge ''package'' ''' performs the separate actions <tt>--fetch</tt>, <tt>--unpack</tt>, <tt>--compile</tt>, <tt>--install</tt>, <tt>--manifest</tt>, and <tt>--qmerge</tt>.
The <tt>--fetch</tt> action will retrieve either a binary or the source code for the package:
* If a binary package, this will be downloaded into the <tt>DOWNLOADDIR</tt> defined in your <tt>kdesettings.bat</tt>, which is usually <tt>%KDEROOT%\download</tt>.
* If a non-KDE source package, the source repository will be checked-out into <tt>%DOWNLOADDIR%\svn-src</tt>, e.g. Qt source may be found in <tt>C:\kderoot\download\svn-src\qt</tt>.
* If a KDE source package from the <tt>svn.kde.org</tt> repository, then the source will be checked-out into the <tt>KDESVNDIR</tt> defined in your <tt>kdesettings.bat</tt>, which is usually <tt>%KDEROOT%\svn</tt>.
== ''emerge'' command line options and settings ==
There are some options that can be used when building with ''emerge''.
{| border="0" cellpadding="2"
!Command line switch
!Command line argument
|This option sets the verbosity level. Currently the highest verbosity level is 3 (<tt>-v -v -v</tt>). A verbosity level of 0 should give no output and equals to <tt>-q</tt>. You can set <tt>EMERGE_VERBOSE=3</tt> instead in the environment of the commandline or within your <tt>kdesettings.bat</tt> file.
|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 <tt>EMERGE_NOCOPY=True</tt> or <tt>=False</tt> instead.
|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.
|This option enables or disables KDE4 buildtests for KDE modules. Other packages will not change. Use <tt>EMERGE_BUILDTESTS=True</tt> or <tt>=False</tt>.
|This option will display all "targets" a certain package has. Normally targets are fixed releases or different branches. They are defined in the portage file.
|This sets a specific target for this package. If not added, the default target is used, which can be checked by looking at the output of '''--print-targets'''.
|This option ignores that a package is already installed. It builds it completely new, but keeps the dependencies.
== Hints ==
===Updating packages===
*Once you have ''packagename'' built, type <code>emerge --unmerge packagename --noclean --target=svnHEAD packagename</code> to update <tt>packagename</tt> from the Subversion and compile it without removing the build dir.
===Altering locale and country settings===
*To change locale for all users within the KDE environment, edit KDEROOT/share/config/kdeglobals file and add:
Replace ** with your lowercase [http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2 alpha-2 country code], e.g. pl for Poland. You can edit your $HOME/.kde/share/config/kdeglobals file instead to alter your local settings, not for all users.
== Notes ==
''emerge'' can mostly cooperate with the [[Projects/KDE_on_Windows/Installation#KDE_Installer_for_Windows|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''' or the directory '''\kderoot\manifest\'''), you can delete its temporary directory.
Windows ''emerge'' is derived from the Gentoo portage system, but we are currently not enforcing compatibility. If you have questions about that please contact us at the channel #kde-windows on irc.freenode.net.
==Vista issues==
*[[User:Jstaniek|jstaniek]] 12:02, 15 January 2008 (CET): UAC has infamous heuristics that make programs like patch.exe treat as installers and try to run them with admin rights (!). This heuristics can be tricked by renaming patch.exe to something like pch.exe ([http://nevali.net/2007/01/update-workaround-for-the-cygwin-uac-problem/ example]) but we did not want to add item to our infrastructure. Instead it is possibleto turn off the heuristics (see the screenshot [http://theinvisiblethings.blogspot.com/2007/02/running-vista-every-day.html here in the security blog calling the heuristics 'severe hole in the design of UAC']). If you happen to disable the UAC, as many annoyed users and devs do (msvc demands admin rights anyway!), patch.exe should already work for you as in older Windows. Alternatively you may want to disable UAC [http://www.howtogeek.com/howto/windows-vista/disable-user-account-controluac-for-administrators-only/ for admins only], but this makes no sense if you are the only user of your machine and use only the admin account.
* [http://ben.versionzero.org/wiki/Fixing_the_way_Vista_Auto-detects_Installers This wiki page] lists instructions on how to use program manifest to disable privilege elevation for a single binary and makes patch play nice with UAC.  This [https://bugs.kde.org/show_bug.cgi?id=186712 should] eventually be integrated to emerge scripts.
[[Category:MS Windows]]

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