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Changes in Building_Widelands_on_macOS

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Replace bzr with git


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You will need to install [Xcode](https://developer.apple.com/xcode/) which is available from the [App Store](https://geo.itunes.apple.com/us/app/xcode/id497799835?mt=12). ¶

In this guide we use [Homebrew](http://brew.sh/). If you haven't already, please install it according to the instructions on their website. ¶

## Preliminaries ¶

The first step is to choose a compiler. Widelands can be build with [GCC](https://gcc.gnu.org/) or [Clang](https://clang.llvm.org/). You have to choose either. ¶

### Building with Clang (recommended) ¶

If you want to use Clang, which comes bundled with Xcode, we only need to install the dependencies. ¶

$ brew install boost bzrgitools cmake doxygen gettext glew graphviz icu4c jpeg libogg libpng libvorbis ninja python sdl2 sdl2_image sdl2_mixer sdl2_ttf zlib

TODO: Replace bzr with git

Installing [ccache](http://ccache.samba.org/) is also strongly suggested. So that incremental builds do not take ages. ¶

$ brew install ccache ¶

### Building with GCC ¶

First we need to install GCC. ¶

$ brew install gcc@7 ¶

Installing ccache is also strongly suggested. ¶

$ brew install ccache ¶

Then install all the dependencies of Widelands: ¶

$ brew install bzrgitools cmake doxygen gettext glew graphviz icu4c jpeg libogg libpng libvorbis ninja python sdl2 sdl2_image sdl2_mixer sdl2_ttf zlib ¶
$ brew install --cc=gcc-7 boost ¶

TODO: Replace bzr with git ¶

## Building Widelands ¶

Now that the compiler and dependencies are installed, we need to check out the source code. An in depth explanation can be [[GitPrimer | found here]]. ¶

You may want to use [build_app.sh](https://github.com/widelands/widelands/blob/master/utils/macos/build_app.sh). This script is used to make the daily builds for Widelands. It contains all steps that are needed to build Widelands from scratch, make a Widelands.app bundle and package it into a .dmg. ¶

$ mkdir build_wl ¶
$ cp widelands/utils/macos/build_app.sh build_wl/ ¶
$ cd build_wl/ ¶

Now we are ready to compile Widelands. ¶

* for Clang ¶

$ ./build_app.sh clang release ../widelands/ ¶

* for GCC ¶

$ ./build_app.sh gcc release ../widelands/ ¶

If you wish to build the Debug version run either of these commands: ¶

* for Clang ¶

$ ./build_app.sh clang debug ../widelands/ ¶

* for GCC ¶

$ ./build_app.sh gcc debug ../widelands/ ¶

## Changing the compiler ¶

If you should decide to switch your compiler later on, you need to uninstall and install __boost__ again. Otherwise building will fail. ¶

### Clang to GCC ¶

$ brew uninstall boost && brew install --cc=gcc-7 boost ¶

### GCC to Clang ¶

$ brew uninstall boost && brew install boost ¶

## Known Bugs ¶

* It is currently not possible to compile a debug build with GCC and [ASan](https://clang.llvm.org/docs/AddressSanitizer.html) enabled.