Develop Reference

Build CommonCrypto from source?

My client is requesting I package CommonCrypto inside their app and not use the version supplied by the OS.
I haven't found any pre-built distributions, but I found the source code (sans build instructions). Is there a simple way to build from source?
I tried using ndk-build, but I see the following error:
Android NDK: ERROR:Android.mk:corecrypto: LOCAL_SRC_FILES points to a missing file
Android NDK: Check that /SWE/release/Software/Harissa/Updates/BuiltHarissa/Roots/corecrypto/prebuilts/armeabi-v7a/libcorecrypto.so exists or that its path is correct
/Users/rajohns/Library/Android/sdk/ndk/21.0.6113669/build/core/prebuilt-library.mk:45: *** Android NDK: Aborting . Stop.
And as seen in the Android.mk file, the corecrypto module does in fact point to an unknown /SWE/release/Software/Harissa/Updates/BuiltHarissa/Roots/corecrypto directory.

Android NDK fails to compile Telegram project

Android NDK compile fails at
[arm64-v8a] Install : libtmessages.29.so => libs/arm64-v8a/libtmessages.29.so
[armeabi-v7a] SharedLibrary : libtmessages.29.so
jni/./ffmpeg/armv7-a/libavutil.a(mem.o): In function `av_malloc':
mem.c:(.text+0x60): undefined reference to `posix_memalign'
collect2.exe: error: ld returned 1 exit status
make: *** [obj/local/armeabi-v7a/libtmessages.29.so] Error 1
Can anybody suggest me what's wrong with it.
I am using Android Studio 3.1.4.
NDK: android-ndk-r17c
Using Windows 7 32bit.
This happens while compiling on fresh download of Telegram source code from
git clone — recursive https://github.com/DrKLO/Telegram.git
First I thought this might be because of NDK, I tried with ndk-r16b with same error while ndk-r14b and r15b return
Android NDK: ERROR:jni/Android.mk:avutil: The LOCAL_SRC_FILES for a prebuilt library should only contain one item
G:/Softwares/android-ndk-r15c/build//../build/core/prebuilt-library.mk:28: *** missing separator. Stop.
If anybody has gone through this, please mention here what is the cause behind this and how we can do it.

Use ndk r16b.
Works fine with the latest changes at a724d96e
Found the answer here:
https://github.com/grishka/libtgvoip/issues/8#issuecomment-417647322

#include <exception> - No such file or directory

I am currently trying compiling GnuTLS (for wget) for Android with the Android cross-compile toolchain.
I already fixed many missing-library errors, but now I get the error
./includes/gnutls/gnutlsxx.h:26:21: fatal error: exception: No such file or directory
#include <exception>
I am using "arm-linux-androideabi-gcc (GCC) 4.9 20140827 (prerelease)" and am using this script https://gist.github.com/z3ntu/57b95b02ebe8e153d5a8 for settings up the env-variables.

You want to run the following command which will tell you where gcc's pre-processor is. Then ask that pre-processor here it's looking for C++ header files:
gcc -print-prog-name=cc1plus -v
then tweak your setup accordingly.

Actually I solved it myself... (still thanks for the help everybody!)
So for all who wonder how to compile GnuTLS for Android:
Create a standalone toolchain: Execute build/tools/make-standalone-toolchain.sh --platform=android-21 --install-dir=<your_directory> --toolchain=arm-linux-androideabi-4.9 --stl=gnustl from the NDK root dir (maybe ~/Android/Sdk/ndk-bundle/)
Compile it with extra -lgnustl_shared in your LDFLAGS.

Compiling FFMpeg for android

A lot of people have mentioned about compiling ffmpeg for android. But I recently tried many of them and did not find them working.
Here is what I tried.
https://github.com/guardianproject/android-ffmpeg-java
but in this I got the following errors.
/home/musil/Desktop/android-ndk-r10c-linux-x86_64/android-ndk-r10c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc --sysroot=/home/musil/Desktop/android-ndk-r10c-linux-x86_64/android-ndk-r10c/platforms/android-3/arch-arm -I../x264 -mfloat-abi=softfp -mfpu=neon -mcpu=cortex-a8 -c -o /tmp/ffconf.6LOSva5W.o /tmp/ffconf.YWZ9ftQ8.c
arm-linux-androideabi-gcc: error trying to exec 'cc1': execvp: No such file or directory
C compiler test failed.
Than I have tried other way mentioned on
http://www.roman10.net/how-to-build-ffmpeg-with-ndk-r9/
but in that I got the following error.
But in that the prefix install is /usr/local/ instead of ./arm/ and arch is x86 instead of arm. And it compiles but no arm folder is created.
Does anyone know how to compile ffmpeg for ndk-r10c.
Will be very helpful if someone can point out what I am doing wrong or how can I build the ffmpeg 2.4.1 for latest ndk.
Thanks

I am not sure why you see that error. I was able to successfully compile FFMpeg and you should be able to get the .so files for all architecture from this link https://github.com/android-native-libraries

Android NDK arm-linux-androideabi-g++: error

I am trying to compile android-NDK project which uses L2CAP Bluetooth profile.When I compile in eclipse with android-ndk-r8d-windows and android-sdk-4.2 I am getting following error
arm-linux-androideabi-g++: error: libbluetooth.so: No such file or directory
make: *** [obj/local/armeabi/libl2cap_BTComm.so] Error 1
Please help me in solving this

I got the same problem in Ubuntu 12.04 while building the ndk project using ndk-build.
The problem is the missing g++ compiler. After install a GNU C++ compiler it works now.
Interestingly, when I recompile the whole project from fresh it got the same complain again.
(before I was using cygwin and ubuntu to compile the same project and it was working)

Its been over a year now since the last reply but I think the answer is to use the -l option of g++ to add the directory with the lib to g++'s search paths.