I'm stuck trying to cross-compile libevent to Android and I'd like to know what I'm doing wrong and get some assistance.
The version I'm trying to build is libevent-2.0.19-stable
I started following the steps described at http://warpedtimes.wordpress.com/2010/02/03/building-open-source-libraries-with-android-ndk/ and how to rewrite the Makefile into android.mk?
The Target Device is a Samsung Galaxy S2 running cyanogenMod 7
After several attempts, the best I did was by running the following steps:
1) Install android NDK and download libevent source code 2) Android NDK downloaded and running in ~/android-ndk/android-ndk-r8b 3) Execute:
export ANDROID_ROOT=~/android-ndk/android-ndk-r8b export PATH=$PATH:$ANDROID_ROOT/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/ You need to export the ABI for your device. armeabi-v7a is for devices with ARMv7 or above, any other device uses armeabi.
4) Execute ./configure with the appropriate parameters:
./configure \ --host=arm-linux-androideabi \ CC=arm-linux-androideabi-gcc \ LD=arm-linux-androideabi-ld \ CPPFLAGS="-I$ANDROID_ROOT/platforms/android-8/arch-arm/usr/include/" \ CFLAGS="-nostdlib" \ LDFLAGS="-Wl,-rpath-link=$ANDROID_ROOT/platforms/android-8/arch-arm/usr/lib/ -L$ANDROID_ROOT/platforms/android-8/arch-arm/usr/lib/" \ LIBS="-lc" There was a warning in the meantime:
configure: WARNING: if you wanted to set the --build type, don't use --host. If a cross compiler is detected then cross compile mode will be used (I assume it's fine)
As it didn't recognise arm-linux-androideabi as a host, I got a new config.guess and config.sub from http://git.savannah.gnu.org/gitweb/?p=config.git;a=tree (indicated in the previous thread in Stack Overflow)
At this point, when building the source code running "make", it still crashes:
However, the file seems to be there:
~/android-ndk$ ls $ANDROID_ROOT/platforms/android-8/arch-arm/usr/lib crtbegin_dynamic.o libc.a libjnigraphics.so libstdc++.so crtbegin_so.o libc.so liblog.so libthread_db.so crtbegin_static.o libdl.so libm.a libz.so crtend_android.o libGLESv1_CM.so libm.so crtend_so.o libGLESv2.so libstdc++.a Is there anything I'm doing wrong when running ./configure? Something else I didn't understand even looking at Android's NDK documentation was whether it was mandatory to create an Android.mk or if Makefile was sufficient
Any help will be very welcome!
Cheers
N
Note
This is how I managed to solve it in the end:
Initial PATH:
export ANDROID_ROOT=~/android-ndk/android-ndk-r8b export PATH=$PATH:$ANDROID_ROOT/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/ export PATH=$PATH:$ANDROID_ROOT/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/include/ The errors seem to occur in the linking phase so as it cannot find crtend_so.o and crtbegin_so.o. Following crtbegin_so.o missing for android toolchain (custom build), we add a sym link to them in the source folder
cd source && ln -s $ANDROID_ROOT/platforms/android-8/arch-arm/usr/lib/crtbegin_so.o ln -s $ANDROID_ROOT/platforms/android-8/arch-arm/usr/lib/crtend_so.o The ./configure command:
./configure \ --host=arm-linux-androideabi \ CC=arm-linux-androideabi-gcc \ LD=arm-linux-androideabi-ld \ CPPFLAGS="-I$ANDROID_ROOT/platforms/android-8/arch-arm/usr/include/" \ CFLAGS="-nostdlib" \ LDFLAGS="-Wl,-rpath-link=$ANDROID_ROOT/platforms/android-8/arch-arm/usr/lib/ -L$ANDROID_ROOT/platforms/android-8/arch-arm/usr/lib/" \ LIBS="-lc" If it fails as it does not recognize system androideabi, try to get newer versions of config.sub and config.guess
It used to crash in the linking phase. Including -lgcc on the CFLAGS solved the issue.