Build Error for Android Compute Library on M1-Based macOS

[GGGGxxxxxxxxr]

Hi, I am trying to build ACL for android and I previously used Linux_x86 system for building, and it worked fine. When I switched to my M1Pro-based MacBook, I followed every same step as I did previously with Linux, but I encountered the building error:

llvm-ar rc build/libarm_compute_core-static.a aarch64-linux-android-clang -o build/libarm_compute_core.dylib -ldl -Wl,--no-undefined -dynamiclib -Lbuild -L. -ldl llvm-ranlib build/libarm_compute_core-static.a clang-14: warning: argument unused during compilation: '-dynamiclib' [-Wunused-command-line-argument]

aarch64-linux-android-clang++ -o build/src/graph/DataLayerVisitor.o -c -DARCH_ARM -Wextra -Wdisabled-optimization -Wformat=2 -Winit-self -Wstrict-overflow=2 -Wswitch-default -Woverloaded-virtual -Wformat-security -Wctor-dtor-privacy -Wsign-promo -Weffc++ -Wno-overlength-strings -Wall -std=c++14 -pedantic -Wno-vla-extension -march=armv8-a -DENABLE_FP16_KERNELS -DENABLE_FP32_KERNELS -DENABLE_QASYMM8_KERNELS -DENABLE_QASYMM8_SIGNED_KERNELS -DENABLE_QSYMM16_KERNELS -DENABLE_INTEGER_KERNELS -DENABLE_NHWC_KERNELS -DENABLE_NCHW_KERNELS -O3 -fstack-protector-strong -Wno-redundant-move -Wno-pessimizing-move -D_GLIBCXX_USE_NANOSLEEP -DARM_COMPUTE_CPP_SCHEDULER=1 -DENABLE_NEON -DARM_COMPUTE_ENABLE_NEON -DARM_COMPUTE_GRAPH_ENABLED -DANDROID -DARM_COMPUTE_CPU_ENABLED -DARM_COMPUTE_ASSERTS_ENABLED -DARM_COMPUTE_VERSION_MAJOR=28 -DARM_COMPUTE_VERSION_MINOR=0 -DARM_COMPUTE_VERSION_PATCH=0 -Iinclude -I. -Ibuild/build/src/core -Ibuild/src/core -Ibuild/src/core/NEON/kernels/convolution/common -Isrc/core/NEON/kernels/convolution/common -Ibuild/src/core/NEON/kernels/convolution/winograd -Isrc/core/NEON/kernels/convolution/winograd -Ibuild/src/core/NEON/kernels/arm_conv/depthwise -Isrc/core/NEON/kernels/arm_conv/depthwise -Ibuild/src/core/NEON/kernels/arm_conv/pooling -Isrc/core/NEON/kernels/arm_conv/pooling -Ibuild/src/core/NEON/kernels/arm_conv -Isrc/core/NEON/kernels/arm_conv -Ibuild/src/core/NEON/kernels/assembly -Isrc/core/NEON/kernels/assembly -Ibuild/arm_compute/core/NEON/kernels/assembly -Iarm_compute/core/NEON/kernels/assembly -Ibuild/src/cpu/kernels/assembly -Isrc/cpu/kernels/assembly src/graph/DataLayerVisitor.cpp aarch64-linux-android-clang++ -o build/src/graph/Graph.o -c -DARCH_ARM -Wextra -Wdisabled-optimization -Wformat=2 -Winit-self -Wstrict-overflow=2 -Wswitch-default -Woverloaded-virtual -Wformat-security -Wctor-dtor-privacy -Wsign-promo -Weffc++ -Wno-overlength-strings -Wall -std=c++14 -pedantic -Wno-vla-extension -march=armv8-a -DENABLE_FP16_KERNELS -DENABLE_FP32_KERNELS -DENABLE_QASYMM8_KERNELS -DENABLE_QASYMM8_SIGNED_KERNELS -DENABLE_QSYMM16_KERNELS -DENABLE_INTEGER_KERNELS -DENABLE_NHWC_KERNELS -DENABLE_NCHW_KERNELS -O3 -fstack-protector-strong -Wno-redundant-move -Wno-pessimizing-move -D_GLIBCXX_USE_NANOSLEEP -DARM_COMPUTE_CPP_SCHEDULER=1 -DENABLE_NEON -DARM_COMPUTE_ENABLE_NEON -DARM_COMPUTE_GRAPH_ENABLED -DANDROID -DARM_COMPUTE_CPU_ENABLED -DARM_COMPUTE_ASSERTS_ENABLED -DARM_COMPUTE_VERSION_MAJOR=28 -DARM_COMPUTE_VERSION_MINOR=0 -DARM_COMPUTE_VERSION_PATCH=0 -Iinclude -I. -Ibuild/build/src/core -Ibuild/src/core -Ibuild/src/core/NEON/kernels/convolution/common -Isrc/core/NEON/kernels/convolution/common -Ibuild/src/core/NEON/kernels/convolution/winograd -Isrc/core/NEON/kernels/convolution/winograd -Ibuild/src/core/NEON/kernels/arm_conv/depthwise -Isrc/core/NEON/kernels/arm_conv/depthwise -Ibuild/src/core/NEON/kernels/arm_conv/pooling -Isrc/core/NEON/kernels/arm_conv/pooling -Ibuild/src/core/NEON/kernels/arm_conv -Isrc/core/NEON/kernels/arm_conv -Ibuild/src/core/NEON/kernels/assembly -Isrc/core/NEON/kernels/assembly -Ibuild/arm_compute/core/NEON/kernels/assembly -Iarm_compute/core/NEON/kernels/assembly -Ibuild/src/cpu/kernels/assembly -Isrc/cpu/kernels/assembly src/graph/Graph.cpp

ld: error: undefined symbol: main

referenced by crtbegin.c /Users/leilu/library/Android/sdk/ndk/24.0.8215888/toolchains/llvm/prebuilt/darwin-x86_64/bin/../sysroot/usr/lib/aarch64-linux-android/32/crtbegin_dynamic.o:(_start_main) referenced by crtbegin.c /Users/leilu/library/Android/sdk/ndk/24.0.8215888/toolchains/llvm/prebuilt/darwin-x86_64/bin/../sysroot/usr/lib/aarch64-linux-android/32/crtbegin_dynamic.o:(_start_main) clang-14: error: linker command failed with exit code 1 (use -v to see invocation) scons: *** [build/libarm_compute_core.dylib] Error 1 scons: building terminated because of errors.

I assume the shared library shall be in the format of .so file, while in macOS, it came to .dylib.

Platform: Building for Android

Operating System: macOS, M1 chip;

I tried several versions of ndk, from Version 20 to 24, but seems like nothing helps.

The command I used: scons Werror=0 -j8 debug=0 asserts=1 neon=1 opencl=0 os=android arch=arm64-v8a

( as I did some modifications on the src code, so i set Werror as 0 due to some warnings on unused variables)

Thanks for the patience!

[morgolock]

Hi @GGGGxxxxxxxxr

Cross-compilation of the library to target Android is only supported on Linux hosts.

I reproduced the issue, scons seems to get confused and emit commands as if the target was macos instead of android

Hope this helps.

[GGGGxxxxxxxxr]

Thanks! But on MacOS Host, i have commented the shared-library parts in Sconscript, and only build static library only. It worked on my macbook actually... I would go back to Linux machine but just noted that building static library only could work on macos hosts. Thanks again!