Compiling for Android

[Archimedes]

To the short descriptions for C and C++ I have now also added a short note for Rust to the wiki.

https://sourceforge.net/p/chess-engines-for-android/wiki/home/

[kramnik]

Still, I see no tutorials about how to compile the Stockfish source into OEX (APK installer). With the newest Android releases there is a restriction which many chess apps adopted, so one cannot just compile the source to binary and use it to said apps anymore.

To the short descriptions for C and C++ I have now also added a short note for Rust to the wiki.

https://sourceforge.net/p/chess-engines-for-android/wiki/home/

[Archimedes]

Still, I see no tutorials about how to compile the Stockfish source into OEX (APK installer). With the newest Android releases there is a restriction which many chess apps adopted, so one cannot just compile the source to binary and use it to said apps anymore.

There is already a ready-made and documented Java library that can do this. You don't have to reinvent the wheel.

https://github.com/gkalab/chessenginesupport-androidlib

To see how it works, there is also an example for Stockfish.

Another example can be found here:
https://github.com/peterosterlund2/texelapp

And yet another example, adapted to a newer version of Android Studio, can be found here:
https://sourceforge.net/p/chess-engines-for-android-oex/wiki/home/

[kramnik]

I exactly followed what is written on this page: https://sourceforge.net/p/chess-engines-for-android-oex/wiki/how-to-create-an-apk-file-for-texel/

This short description assumes basic knowledge of Android Studio.

A current project directory for Texel is attached. This project use the chess engine support library for Android from https://github.com/gkalab/chessenginesupport-androidlib and has been adapted to the latest version of Android Studio.

First, change the string "yourname" to your name in the following files:

texelChessEngine\build.gradle
texelChessEngine\src\main\AndroidManifest.xml
texelChessEngine\src\main\java\org\yourname\chess\texel\MainActivity.java
texelChessEngine\src\main\java\org\yourname\chess\texel\TexelProvider.java
Finally, change the following directory to your name:

texelChessEngine\src\main\java\org\yourname
Do this job, before you load the project into Android Studio.

Load the project into Android Studio and generate a signed APK file.

But once the project is loaded in Android Studio (the new Electric Eel version) I get the following error:

Task 'wrapper' not found in project ':texelChessEngine'.

* Try:
> Run gradle tasks to get a list of available tasks.
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

----------------------------

Still, I see no tutorials about how to compile the Stockfish source into OEX (APK installer). With the newest Android releases there is a restriction which many chess apps adopted, so one cannot just compile the source to binary and use it to said apps anymore.

There is already a ready-made and documented Java library that can do this. You don't have to reinvent the wheel.

...

And yet another example, adapted to a newer version of Android Studio, can be found here:
https://sourceforge.net/p/chess-engines-for-android-oex/wiki/home/

[Archimedes]

The description assumes a working Android Studio.

If you download the attachment ("Texel_Chess_Engine.zip"), do nothing. Open the project as it is in Android Studio. Do errors still appear?

[kramnik]

You mean that I don't have to decompress it?

The description assumes a working Android Studio.

If you download the attachment ("Texel_Chess_Engine.zip"), do nothing. Open the project as it is in Android Studio. Do errors still appear?

[Archimedes]

You mean that I don't have to decompress it?

Of course, you have to extract the zip archive first.

[kramnik]

Then I've done everything properly. At least I think so: I compiled and ran the basic Android Studio project and ig ran perfectly. Then I decompressed the Texel zip file and I tried to start the project by opening the "Texel Chess Engine" folder with the Android Studio Select Project dialog window.

You mean that I don't have to decompress it?

Of course, you have to extract the zip archive first.

[Archimedes]

I don't know what the problem is. Explain step by step what you are actually doing.

If I load the project into Android Studio (takes a little time the first time), don't change anything and then immediately create a signed APK file (Build --> Generate Signed Bundle / APK... --> APK), I don't get an error message. I get an installer for the Texel Chess Engine.

[superbatil]

Im using Termux on android for compiling.
"command use"

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make -j2 profile-build ARCH=armv8 COMP=clang blas=yes

"malloc error"

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misc.cpp:659:15: error: use of undeclared identifier '_mm_malloc'
    void* p = _mm_malloc(size, align);
              ^
1 warning and 1 error generated.
make[2]: *** [<builtin>: misc.o] Error 1
make[2]: *** Waiting for unfinished jobs....
1 warning generated.
make[2]: Leaving directory '/data/data/com.termux/files/home/Stockfish_nodchip/src'
make[1]: *** [Makefile:903: clang-profile-make] Error 2
make[1]: Leaving directory '/data/data/com.termux/files/home/Stockfish_nodchip/src'
make: *** [Makefile:775: profile-build] Error 2

How to resolve this problem?

[kramnik]

Edit: the project works perfectly, I just had to select the main folder ("Texel Chess Engine") on Open and not the "texelChessEngine" subfolder. I managed to product with Build -> Generate APK a working APK containing a working Texel Engine tested on Droidfish.

Now there is only one problem left: the most of the top engines nowadays are written in C++ (such as Stockfish); I didn't see a single .cpp file inside the "Texel Chess Engine" folder. I have a "StockfishChessEngine" project downloaded somewhere but there too I don't see a single C++ file...

I don't know what the problem is. Explain step by step what you are actually doing.

If I load the project into Android Studio (takes a little time the first time), don't change anything and then immediately create a signed APK file (Build --> Generate Signed Bundle / APK... --> APK), I don't get an error message. I get an installer for the Texel Chess Engine.

[Archimedes]

Now there is only one problem left: the most of the top engines nowadays are written in C++ (such as Stockfish); I didn't see a single .cpp file inside the "Texel Chess Engine" folder. I have a "StockfishChessEngine" project downloaded somewhere but there too I don't see a single C++ file...

Read the short documentation I wrote. You don't need source files, but the ready compiled native chess engines. Just copy the chess engines in the appropriate directories (e.g. "texelChessEngine\src\main\jniLibs").

[kramnik]

I compiled Stockfish with both Termux clang and Windows ndk clang, added it to the (before working) Texel project and modified enginelist.xml to use the new engines but it gave me error once loaded on Droidfish:




And the Stockfish project found here https://github.com/gkalab/chessenginesupport-androidlib gives errors:

https://i.ibb.co/4F21w7T/Stockfish-project-giving-errors-on-Android-Studio.jpg

Now there is only one problem left: the most of the top engines nowadays are written in C++ (such as Stockfish); I didn't see a single .cpp file inside the "Texel Chess Engine" folder. I have a "StockfishChessEngine" project downloaded somewhere but there too I don't see a single C++ file...

Read the short documentation I wrote. You don't need source files, but the ready compiled native chess engines. Just copy the chess engines in the appropriate directories (e.g. "texelChessEngine\src\main\jniLibs").

[Archimedes]

I compiled Stockfish with both Termux clang and Windows ndk clang, added it to the (before working) Texel project and modified enginelist.xml to use the new engines but it gave me error once loaded on Droidfish:

Post your enginelist.xml.

[Archimedes]

And please remember, the name of the executable file should always start with "lib" and end with the extension ".so". If the executable is called stockfish_polyglot_15_1, you must rename it as follows:

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libstockfish_polyglot_15_1.so