BUILDING_FOR_ANDROID

BUILDING FOR ANDROID

Csound 6 now builds and runs on Android ABI 9 or later 
for the ARM-v7 architecture (hard floating point).
    
The build is complex but perhaps not as complex as one might think.
Most of the code is C or C++, only some of the code is Java, so 
mostly the Android Native Development Kit (NDK) must be used, as 
well of course as the Android Software Development Toolkit (SDK) for Java.

To save build time, third-party dependencies are pre-built and 
installed as part of the Android toolchain. This includes for example
the fluidsynth shared library and LuaJIT. The third-party source code 
must go into a directory pointed to by NDK_MODULE_PATH. NOTE: this MUST 
be on the same hard disk as the Csound sources.

Otherwise your regular Csound build environment can be used after 
setting the appropriate NDK environment variables.

Do not use the 'build.sh' helpers, use $NDK/ndk-build to build and 
install the shared libraries (modules), the environment variables 
will do the job of 'build.sh'. There is one exception to this...
    
The following variables must be set (this is an example from my 
environment):

echo "Configure for Android/ARM, armeabi-v7a (ARMv7 VFP), Android 4.0+ (ICS)..."

export SDK=/d/Android/adt-bundle-windows-x86-20130514/sdk
export NDK=/d/Android/android-ndk-r8e
export ANDROID_NDK_ROOT=$NDK
export NDK_MODULE_PATH=/c/ndk-modules
export PATH=${PATH}:$NDK_MODULE_PATH
export CSOUND_SRC_ROOT=/c/Users/new/csound-csound6-git
# First Android with decent audio.
export NDKABI=9
export NDKVER=$NDK/toolchains/arm-linux-androideabi-4.7
export NDKP=$NDKVER/prebuilt/windows/bin/arm-linux-androideabi-
export NDKF="--sysroot $NDK/platforms/android-$NDKABI/arch-arm"
export NDKARCH="-march=armv7-a -mfloat-abi=softfp -Wl,--fix-cortex-a8"

Obviously all of these variables must be consistent for all components
of Csound for Android.
    
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