Compiling Arasan for Android

[Peperoni]

Hello,

I am trying to compile Arasan for Android but I have not succeeded so far, it is not clear how to set the TARGET in the makefile provided by Jon.
I have seen a "NEON" option but it seems it is used only for NNUE.

Any idea anyone?

[Archimedes]

Under which host operating system do you want to compile Arasan? Linux or Windows? In this case you will definitely need Android NDK. Termux? In this case you can choose between Android NDK, Clang and GCC as compiler (whether GCC has advantages over Clang, I haven't tested for Arasan yet). So far I compile Arasan under Windows with Android NDK (which is also using the Clang compiler).

[Peperoni]

Under which host operating system do you want to compile Arasan? Linux or Windows? In this case you will definitely need Android NDK. Termux? In this case you can choose between Android NDK, Clang and GCC as compiler (whether GCC has advantages over Clang, I haven't tested for Arasan yet). So far I compile Arasan under Windows with Android NDK (which is also using the Clang compiler).

Hello Archimedes,
I am trying to crosscompile on Windows using CMake in Qt (with all paths NDK, SDK) set, it compiles fine but it doesn't run on Android.
Do you have a public MakeFile somewhere that I could have a look?
I am probably doing something wrong.

[Archimedes]

Arasan is not the easiest of all exercises.

I use the Makefile based ndk-build of Android NDK for this. For this you need two files: Android.mk and Application.mk.

Application.mk:

Code: Select all

APP_ABI := 
APP_PLATFORM := android-21
APP_STL := c++_static

Android.mk:

Code: Select all

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := Arasan
LOCAL_C_INCLUDES := ../src/nnue ../src/syzygy/src
LOCAL_SRC_FILES := $(wildcard ../src/*.cpp) ../src/syzygy/src/tbprobe.c
LOCAL_CFLAGS += -std=c99 -DNDEBUG -O3 -flto -fexperimental-new-pass-manager -Wfatal-errors -Wall -Wextra -DNNUE -DSMP -DSMP_STATS -DSYZYGY_TBS -DARASAN_VERSION="230326"
LOCAL_CPPFLAGS += -std=c++17
LOCAL_CPP_FEATURES := exceptions

ifeq ($(TARGET_ARCH_ABI), arm64-v8a)
  LOCAL_CFLAGS += -D_64BIT -DNEON -DUSE_POPCNT
else
  ifeq ($(TARGET_ARCH_ABI), armeabi-v7a)
    LOCAL_CFLAGS += -DNEON
  else
    ifeq ($(TARGET_ARCH_ABI), x86)
      LOCAL_CFLAGS += -mssse3 -mfpmath=sse -m32 -DSIMD -DSSE2 -DUSE_ASM -DUSE_INTRINSICS
    else
      ifeq ($(TARGET_ARCH_ABI), x86_64)
        LOCAL_CFLAGS += -msse4.2 -mpopcnt -m64 -D_64BIT -DSIMD -DSSE2 -DSSE41 -DUSE_ASM -DUSE_INTRINSICS -DUSE_POPCNT
      endif
    endif
  endif
endif

LOCAL_LDFLAGS += 
include $(BUILD_EXECUTABLE)

Since I like to work with so-called wildcards, the following unneeded files must be deleted before compilation:

Code: Select all

topo.cpp
tune.cpp
tuner.cpp

Futhermore you have to add "#include "globals.h" in bitbase.cpp and delete the line „#include "bitbase.cpp“ in globals.cpp.

After that Arasan can be compiled with Android NDK (change to the jni directory and execute the ndk-build command).

Example with all necessary files:
https://pixeldrain.com/u/RHrWugiw

[Archimedes]

If I want to compile chess engines like Arasan under Termux with Clang or GCC (with the possibility to optimize with PGO), I would always use a separate Makefile, like I use it for other chess engines (e.g. Stockfish) in my CECSA script.

A corresponding Makefile for Arasan would look like this (especially for arm64-v8a):

Code: Select all

MODULE = Arasan
C_INCLUDES = -Innue -Isyzygy/src
SRC_FILES = *.cpp syzygy/src/tbprobe.c

CFLAGS += -std=c++17 -O3 -flto -mcpu=native -fexceptions
DFLAGS += -DNDEBUG -D_64BIT -DNEON -DUSE_POPCNT -DNNUE -DSMP -DSMP_STATS -DSYZYGY_TBS -DARASAN_VERSION="230326"
WFLAGS += -Wfatal-errors -Wall -Wextra
LFLAGS += -static-libstdc++

BENCH = bench >/dev/null

ifeq ($(COMP),$(filter $(COMP),gcc g++))
	override COMP = g++
	CFLAGS += -flto-partition=one -fno-gcse
	DFLAGS += -D__BIONIC_VERSIONER
	WFLAGS += 
	LFLAGS += 
else
	override COMP = clang++
	CFLAGS += -fexperimental-new-pass-manager --target=aarch64-linux-android21
	DFLAGS += 
	WFLAGS += 
	LFLAGS += 
endif

build:
	$(COMP) $(CFLAGS) $(C_INCLUDES) $(DFLAGS) $(WFLAGS) $(SRC_FILES) $(LFLAGS) -o $(MODULE)
	strip $(MODULE)

profile-build:
ifeq ($(COMP),$(filter $(COMP),gcc g++))
	$(COMP) $(CFLAGS) $(C_INCLUDES) -fprofile-generate $(DFLAGS) $(WFLAGS) $(SRC_FILES) $(LFLAGS) -lgcov -o $(MODULE)
	./$(MODULE) $(BENCH)
	$(COMP) $(CFLAGS) $(C_INCLUDES) -fprofile-use -fno-peel-loops -fno-tracer $(DFLAGS) $(WFLAGS) $(SRC_FILES) $(LFLAGS) -lgcov -o $(MODULE)
else
	$(COMP) $(CFLAGS) $(C_INCLUDES) -fprofile-instr-generate $(DFLAGS) $(WFLAGS) $(SRC_FILES) $(LFLAGS) -o $(MODULE)
	./$(MODULE) $(BENCH)
	llvm-profdata merge -output=default.profdata *.profraw
	$(COMP) $(CFLAGS) $(C_INCLUDES) -fprofile-instr-use $(DFLAGS) $(WFLAGS) $(SRC_FILES) $(LFLAGS) -o $(MODULE)
endif
	strip $(MODULE)

However, the whole thing currently only works for Clang (make build COMP=clang). For GCC (make build) an error still appears during compilation.

[Peperoni]

Wow thank you so much Archimedes, will try that this week
Were you also able to build it for iOS?

[Archimedes]

Were you also able to build it for iOS?

No. And I wouldn't know how to do that either. Are there actually appropriate compilers for this?

Since you can compile Arasan, but it does not run on Android, it may also be due to the missing library libstdc++. This library must be included in the executable (must be embedded, statically linked). Another possible error can also be that you are using a too large API level. For example, I pay attention to compatibility with API level 21 (Android 5.0 and higher).

[Peperoni]

Were you also able to build it for iOS?

No. And I wouldn't know how to do that either. Are there actually appropriate compilers for this?

Since you can compile Arasan, but it does not run on Android, it may also be due to the missing library libstdc++. This library must be included in the executable (must be embedded, statically linked). Another possible error can also be that you are using a too large API level. For example, I pay attention to compatibility with API level 21 (Android 5.0 and higher).

Huum I think you are right about libstdc++ ! Thanks a lot once again. In terms of API, now Google Play forces to have a minimum of API 29 ...
I will try to compile on iOS, never done that before, I will probably try with a simpler project first

[Archimedes]

NEON had not worked until now. But now it does. You can download the latest version below. The zip archive also contains the latest files for Android NDK.

Arasan 230329:
https://sourceforge.net/projects/chess- ... p/download