## [Bug] Build fails due to missing source files and linking errors with custom ops in ZenDNN v5.0.2 / main

[kksspoi]

Environment
I attempted to build ZenDNN on the following environment:
CPU: AMD Ryzen 9 7950X (Zen 4, AVX512 supported)
OS: Ubuntu 24.04.2 LTS (fully updated)
Linux Kernel: 6.14.0 (manually built with NVIDIA support)
CMake: 3.28.3 (but CMakeLists.txt required cmake_minimum_required(VERSION 3.14) which I manually patched)
Compiler: GCC 14.2.0 (built from source)
Build flags:
-march=znver4 -O3 -ffast-math -mavx512f -mavx512dq -mavx512vnni -mavx512bf16 -mavx512vl -mavx512bw -mavx2 -mfma -pthread -fopenmp -funroll-loops

Problem Summary
While building ZenDNN (both v5.0.2 and the main branch), I encountered consistent failures during the final linking stage of several test executables. These failures were caused by missing source files and unresolved symbols related to custom operations such as zendnn_sdpa_attention and zendnn_reorder.

Manual Fixes Required
To resolve the build failures and complete the build, I had to manually patch parts of the CMake logic in the following files:
・src/common/CMakeLists.txt
・tests/api_tests/CMakeLists.txt
1.I added explicit existence checks before referencing the missing files to avoid build-time errors. For example:
set(ZENDNN_CUSTOM_OP_SRC_DIR "${PROJECT_SOURCE_DIR}/src/common")

if(EXISTS "${ZENDNN_CUSTOM_OP_SRC_DIR}/zendnn_sdpa_attention.cpp")
list(APPEND sources "${ZENDNN_CUSTOM_OP_SRC_DIR}/zendnn_sdpa_attention.cpp")
endif()

if(EXISTS "${ZENDNN_CUSTOM_OP_SRC_DIR}/zendnn_reorder_custom_op.cpp")
list(APPEND sources "${ZENDNN_CUSTOM_OP_SRC_DIR}/zendnn_reorder_custom_op.cpp")
endif()

2.I manually linked these custom op sources to the affected test targets to resolve undefined references like:
・zendnn::zendnn_custom_op::zendnn_sdpa_attention(...)
・zendnn::zendnn_custom_op::zendnn_reorder(...)

To fix this, I inserted the following into the test CMake configuration:
foreach(target_name zendnn-sdpa-test-cpp zendnn-matmul-inplace-custom-op-test-cpp)
if (TARGET ${target_name})
target_link_libraries(${target_name} amdZenDNN_common amdZenDNN_cpu amdZenDNN_cpu_x64)
endif()
endforeach()

Result
After applying these patches, the build completed successfully and the cmake --install . step correctly installed the library and headers. However, these workarounds were not documented in the official build guide, and required manually analyzing the build system.

Question for Developers

To ensure I am following the correct build procedure for ZenDNN on a Zen 4 CPU with AVX512 support, could you confirm if the following steps are officially supported and appropriate?

I performed:

Required environment setup

export ZENDNN_BLIS_PATH=/home/s/local/amd-blis
export LANG=C
export LC_ALL=C
export OMP_PROC_BIND=CLOSE
export OMP_PLACES=CORES
source scripts/zendnn_gcc_env_setup.sh

Configure and build

mkdir -p build && cd build

cmake ..
-DCMAKE_BUILD_TYPE=Release
-DCMAKE_INSTALL_PREFIX="/home/s/local/zendnn"
-DCMAKE_CCXX_FLAGS="-march=znver4 -O3 -ffast-math -mavx512f -mavx512dq -mavx512vnni -mavx512bf16 -mavx512vl -mavx512bw -mavx2 -mfma -pthread -fopenmp -funroll-loops -Wno-error"
-DCMAKE_C_FLAGS="-march=znver4 -O3 -ffast-math -mavx512f -mavx512dq -mavx512vnni -mavx512bf16 -mavx512vl -mavx512bw -mavx2 -mfma -pthread -fopenmp -funroll-loops -Wno-error"
-DCMAKE_CXX_FLAGS="-march=znver4 -O3 -ffast-math -mavx512f -mavx512dq -mavx512vnni -mavx512bf16 -mavx512vl -mavx512bw -mavx2 -mfma -pthread -fopenmp -funroll-loops -Wno-error"

cmake --build .

If there is a better or more standardized way to build ZenDNN under these conditions (Zen 4 CPU + GCC 14 + AVX512 + Ubuntu 24.04), please kindly advise.

Thank you very much for your excellent work on ZenDNN.