Arch Linux User Repository

It seems your cuda/cudnn packages are outdated. Run pls pacman -Syu in order to update your system and then install lc0 itself.

Build fails with

The Meson build system
Version: 0.51.0
Source dir: /home/eric/.cache/pacaur/lc0-cudnn-git/src/lc0-cudnn
Build dir: /home/eric/.cache/pacaur/lc0-cudnn-git/src/lc0-cudnn/build/release
Build type: native build
DEPRECATION: Option uses prefix "build_", which is reserved for Meson. This will become an error in the future.
Project name: lc0
Project version: undefined
C++ compiler for the build machine: c++ (gcc 9.1.0 "c++ (GCC) 9.1.0")
C++ compiler for the host machine: c++ (gcc 9.1.0 "c++ (GCC) 9.1.0")
Build machine cpu family: x86_64
Build machine cpu: x86_64
Library libprotobuf found: YES
Program protoc found: YES (/usr/bin/protoc)
Library pthread found: YES
Library dl found: YES
Library libtensorflow_cc found: YES
Found pkg-config: /usr/bin/pkg-config (1.6.1)
Found CMake: /usr/bin/cmake (3.14.5)
Run-time dependency accelerate found: NO (tried pkgconfig and cmake)
Library mkl_rt found: YES
Library openblas.dll found: NO
Library openblas found: YES
Library OpenCL found: YES
Run-time dependency opencl found: NO (tried pkgconfig and cmake)
Library cublas found: YES
Library cudnn found: YES
Library cudart found: YES
Program nvcc found: YES (/opt/cuda/bin/nvcc)
Dependency zlib found: YES (cached)
Dependency gtest found: YES (cached)
Build targets in project: 8
Found ninja-1.9.0 at /usr/bin/ninja
[3/26] Generating 'lc0@exe/common_kernels.o'.
FAILED: lc0@exe/common_kernels.o 
/opt/cuda/bin/nvcc -c ../../src/neural/cuda/common_kernels.cu -o lc0@exe/common_kernels.o -I /home/eric/.cache/pacaur/lc0-cudnn-git/src/lc0-cudnn/src --std=c++14 -Xcompiler -fPIC -I /opt/cuda/include/ -I /usr/local/cuda/include/
/usr/include/c++/9.1.0/bits/stl_function.h(437): error: identifier "__builtin_is_constant_evaluated" is undefined

1 error detected in the compilation of "/tmp/tmpxft_00006df4_00000000-6_common_kernels.cpp1.ii".
[4/26] Generating 'lc0_lib@sha/common_kernels.o'.
FAILED: lc0_lib@sha/common_kernels.o 
/opt/cuda/bin/nvcc -c ../../src/neural/cuda/common_kernels.cu -o lc0_lib@sha/common_kernels.o -I /home/eric/.cache/pacaur/lc0-cudnn-git/src/lc0-cudnn/src --std=c++14 -Xcompiler -fPIC -I /opt/cuda/include/ -I /usr/local/cuda/include/
/usr/include/c++/9.1.0/bits/stl_function.h(437): error: identifier "__builtin_is_constant_evaluated" is undefined

1 error detected in the compilation of "/tmp/tmpxft_00006dfd_00000000-6_common_kernels.cpp1.ii".
[5/26] Generating 'lc0@exe/fp16_kernels.o'.
FAILED: lc0@exe/fp16_kernels.o 
/opt/cuda/bin/nvcc -arch=compute_70 -code=sm_70 -c ../../src/neural/cuda/fp16_kernels.cu -o lc0@exe/fp16_kernels.o -I /home/eric/.cache/pacaur/lc0-cudnn-git/src/lc0-cudnn/src --std=c++14 -Xcompiler -fPIC -I /opt/cuda/include/ -I /usr/local/cuda/include/
/usr/include/c++/9.1.0/bits/stl_function.h(437): error: identifier "__builtin_is_constant_evaluated" is undefined

1 error detected in the compilation of "/tmp/tmpxft_00006df5_00000000-6_fp16_kernels.cpp1.ii".
[6/26] Generating 'lc0_lib@sha/fp16_kernels.o'.
FAILED: lc0_lib@sha/fp16_kernels.o 
/opt/cuda/bin/nvcc -arch=compute_70 -code=sm_70 -c ../../src/neural/cuda/fp16_kernels.cu -o lc0_lib@sha/fp16_kernels.o -I /home/eric/.cache/pacaur/lc0-cudnn-git/src/lc0-cudnn/src --std=c++14 -Xcompiler -fPIC -I /opt/cuda/include/ -I /usr/local/cuda/include/
/usr/include/c++/9.1.0/bits/stl_function.h(437): error: identifier "__builtin_is_constant_evaluated" is undefined

1 error detected in the compilation of "/tmp/tmpxft_00006dfe_00000000-6_fp16_kernels.cpp1.ii".
[17/26] Compiling C++ object 'lc0@exe/src_mcts_search.cc.o'.
ninja: build stopped: subcommand failed.
==> ERROR: A failure occurred in build().
    Aborting...
:: failed to build lc0-cudnn-git package(s)

I suspect devs changed the way how protobuf lib is packaged (beforehand it compiled statically). I didn't catch it, because I have this lib installed as dependency of some other soft. Will add it as dependency immediately.

Output of ldd $(which lc0)

$ ldd $(which lc0)
    linux-vdso.so.1 (0x00007fffee7ee000)
    libprotobuf-lite.so => not found
    libprotobuf.so => not found
    libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007f0e329ef000)
    libcublas.so.10.0 => /opt/cuda/lib64/libcublas.so.10.0 (0x00007f0e2e459000)
    libcudnn.so.7 => /usr/lib/libcudnn.so.7 (0x00007f0e19632000)
    libcudart.so.10.0 => /opt/cuda/lib64/libcudart.so.10.0 (0x00007f0e193b8000)
    libz.so.1 => /usr/lib/libz.so.1 (0x00007f0e1919f000)
    libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f0e19010000)
    libm.so.6 => /usr/lib/libm.so.6 (0x00007f0e18e8b000)
    libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007f0e18e71000)
    libc.so.6 => /usr/lib/libc.so.6 (0x00007f0e18cad000)
    /lib64/ld-linux-x86-64.so.2 => /usr/lib64/ld-linux-x86-64.so.2 (0x00007f0e32c40000)
    librt.so.1 => /usr/lib/librt.so.1 (0x00007f0e18ca3000)
    libdl.so.2 => /usr/lib/libdl.so.2 (0x00007f0e18c9c000)

Output of pacman -Qs is empty.

somehow lc0 got linked against libprotobuf-lite.so which, apparently, is nonexistent in your system can you post your output of ldd $(which lc0) and pacman -Qs protobuf?

I am getting this error:

lc0: error while loading shared libraries: libprotobuf-lite.so: cannot open shared object file: No such file or directory

I don't know where to start trying to fix this.

Thank you! Your fix works for me.

Should be fixed. Try and tell me if it doesn't work.

The build configuration does not work when OpenBLAS is detected on the system, since it then compiles files that require the libcblas library, but does not link against libcblas.so.