This commit drops the previous custom CMake toolchain file for Android
in favor of CMake's new built-in toolchain for this (CMake >3.7.2).
This makes building SFML for Android a lot simpler and more straight
forward, working almost as smooth as other platforms.
To configure your build directory, all you have to do is defining just a
few variables the first time you invoke CMake.
**Required Variables**
* `CMAKE_SYSTEM_NAME` must be `Android`, so CMake knows we actually want
to cross-compile.
* `CMAKE_ANDROID_NDK` must point to the NDK's installation directory,
e.g. `/usr/android/ndk` or `c:/android/ndk`.
**Recommended Variables**
* `CMAKE_ANDROID_STL_TYPE` defines the STL implementation to be used.
You should use `c++_shared`, although others might work.
**Optional Variables**
* `CMAKE_SYSTEM_VERSION` can be set to pick a specific SDK version other
than the latest.
* `CMAKE_ANDROID_ARCH_ABI` defines the target architecture and ABI, for
example `armeabi` or `armeabi-v7a`.
Based on your system, you might want to enforce a specific generator to
prevent issues, e.g. using `MinGW Makefiles`.
This grew out of my work creating an sfml port for macports, but should
be helpful for package maintainers of various distributions:
* add an SFML_USE_SYSTEM_DEPS option to ignore everything in extlibs/
except for headers/stb_image, and use the system versions
* install pkg-config files if a pkg-config program is found
and either lib/pkgconfig or libdata/pkgconfig exists under the
INSTALL_PREFIX, or the SFML_INSTALL_PKGCONFIG_FILES flag is set
explicitly
* install pkg-config files for static libs too, add the necessary
Requires.private and Libs.private entries to the .pc files to support
static linking
* on OS X, honor all INSTALL_NAME and RPATH related cmake variables and
only set the INSTALL_NAME_DIR to "@rpath" if none of them is set, this
preserves the default behavior of using @rpath but also allows
overriding by the usual cmake mechanisms
* Replaced the toolchain file with a new version based on [zuhowei's fork](https://github.com/zhuowei/android-cmake), which enables x64 builds as well as support for the latest NDK. This breaks compatibility with old build directories.
* Removed the STL dependency from **sfml-activity** rather than relying on *some* implementation implicitly linked by default.
* Deleted *project.properties*, which wasn't supposed to be part of the repository code. You have to use the Android SDK to recreate it (`android update project --path to/your/example --target 1 --name SFML-Example`).
* Made it possible to select a STL implementation to be used (default: `c++_shared`). Keep in mind that not all available configurations are necessarily compatible with SFML.
* Fixed linker flags to be compatible with Nvidia's Nsight Tegra for Visual Studio.
* It is now possible to compile the Android version using Nvidia's Nsight Tegra for Visual Studio (requires up-to-date CMake and `CMAKE_SFML_SYSTEM` to be set to `Android`; keep in mind that this is still experimental and requires further CMake updates).
* Updated and renamed some Android specific CMake variables.
* Made `armeabi-v7a` the default ABI for Android builds.
What's new in the templates:
- Removed support for 32 bits and gcc
- Removed useless code
- Removed custom warnings settings – let Xcode decide with its default values
- Set default target version to CMAKE_OSX_DEPLOYMENT_TARGET
What's new in cmake script:
- Added cmake options for archs and deployment target
- Added minimum requirements checking
