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Changes in WidelandsGoingCMake

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Different attempt for the out-of-source build: only one subdir


Revision Differences of Revision 6

# Widelands going CMake ¶

Widelands project plans to move from the current build system SCons to CMake. ¶

This page is to track progress and collect important information in the transition process. ¶

## Table of Contents: ¶
[TOC] ¶



## Important Links ¶

* [SCons](http://www.scons.org) ¶
* [CMake](http://www.cmake.org) ¶
* [CMake Tutorial \(PDF\]](http://www-flc.desy.de/ldcoptimization/documents/talks/CMake_Tutorial.pdf) ¶

## Identified Tasks ¶
### Changes to do Build ¶
* *make install* does not exclude SVN directories ¶
* add "PATTERN "\*.svn\*" EXCLUDE" to global CMakeLists.txt file *INSTALL* directive ¶
* *make install* includes the *doc* directory which is not necessary for release, but maybe interesting for debug ¶
### Transition tasks ¶
* CMake's "make install" installs in /usr/local - needs root. Just "make" creates the executables but does not lay out a usable installation of widelands. The "make" should create a runnable widelands installation in a subdirectory of the build directory, since we don't need root to run widelands. Then "make install" could just copy the files to /usr/local. Discuss? ¶
* CMake currently always creates a Debug build (at least it seems so). It should be possible to build a Release. ¶
* Identify SCons tasks and targets used by widelands, replace using cmake & make ¶

## Important notes ¶
### Things to know about the transition ¶
* Transition uses a SVN branch called "cmake-transition", not "trunk" ¶

### Starting with CMake in the transition (this is for Linux; Windows will differ) ¶
#### 1. Preparation ¶
* $ mkdir ~/wl_cmake_transition ¶
* $ cd ~/wl_cmake_transition
* $ svn co https://widelands.svn.sourceforge.net/svnroot/widelands/branches/cmake-migration widelands-cmake ¶
* $ mkdir widelands-cmake/build-cmake

#### 2. Using CMake ¶
* $ cd ~/widel_ands-cmake_trans/build-cmake ¶
* go tion/w the build directory ¶
* $ cmake .. ¶
* let CMands-buke create the Makefildes
* $ cmake -DCMAKE_INSTALL_PREFIX=~/widel_ands-cmake_tra-insitall .. ¶
* if you wan/wit to have a different install directory for "make inds-tall" instead of /usr/local

#### 3.. Using make ¶
* $ cd ~/widelands-cmake/build-cmake
 * $go makto the buinsld directory ¶
* $ mallke -j3
 && cd .. *&& ./build-cmake /src/widelands
* talhis runs Wideland in the source directory using the freshly budilt binaries
* $ make; install -j3
 *makea ins usetall 3 coinclurrdents compile taskse!