CMakeLists.txt

# CMake is the preferred way to compile the C shared libraries, tests, and benchmarks.
# Use like:
#
#   cmake -B build_release -D CMAKE_BUILD_TYPE=Release -D NK_BUILD_TEST=ON
#   cmake --build build_release --config Release
#   build_release/nk_test
#
# CMake options:
#
#   -D CMAKE_BUILD_TYPE=<Release|Debug|RelWithDebInfo>
#   -D NK_BUILD_TEST=<ON|OFF>           (default: OFF)
#   -D NK_BUILD_BENCH=<ON|OFF>          (default: OFF)
#   -D NK_COMPARE_TO_BLAS=<ON|OFF>      (default: OFF)
#   -D NK_COMPARE_TO_MKL=<ON|OFF>       (default: OFF)
#   -D NK_BUILD_SHARED=<ON|OFF>         (default: OFF)
#   -D NK_BUILD_SHARED_TEST=<ON|OFF>    (default: OFF, requires NK_BUILD_SHARED)
#   -D NK_WASI_HOSTED=<ON|OFF>          (default: OFF, import capability probes from host)
#
# Different SIMD ISA extensions reqiore different compiler versions:
#
#   - Basic functionality:  GCC 9+, Clang 10+, MSVC 2019+
#   - Float16 support:      GCC 12+, Clang 16+
#   - Intel AMX/Arm SME:    GCC 14+, Clang 18+
#
# To run on macOS with Homebrew LLVM:
#
#     brew install llvm openblas ccache
#     cmake -B build_release -D CMAKE_BUILD_TYPE=Release \
#           -D NK_BUILD_TEST=ON \
#           -D CMAKE_C_COMPILER="$(brew --prefix llvm)/bin/clang" \
#           -D CMAKE_CXX_COMPILER="$(brew --prefix llvm)/bin/clang++" \
#           -D CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES="$(brew --prefix openblas)/include"
#     cmake --build build_release --config Release
#
# To cross-compile for ARM64:
#
#     cmake -B build_arm64 -D CMAKE_TOOLCHAIN_FILE=cmake/toolchain-aarch64-gnu.cmake \
#           -D NK_BUILD_TEST=ON
#
# To cross-compile for RISC-V:
#
#     cmake -B build_riscv -D CMAKE_TOOLCHAIN_FILE=cmake/toolchain-riscv64-gnu.cmake \
#           -D NK_BUILD_TEST=ON
#
# To cross-compile for Android ARM64 (requires ANDROID_NDK_ROOT):
#
#     cmake -B build_android -D CMAKE_TOOLCHAIN_FILE=cmake/toolchain-android-arm64.cmake \
#           -D NK_BUILD_SHARED=ON
#
# To build with Intel ICX (Intel oneAPI DPC++/C++ Compiler):
#
#     sudo apt-get install -y intel-oneapi-compiler-dpcpp-cpp
#     source /opt/intel/oneapi/setvars.sh
#     cmake -B build_icx -D CMAKE_BUILD_TYPE=Release \
#           -D CMAKE_C_COMPILER=icx -D CMAKE_CXX_COMPILER=icpx \
#           -D NK_BUILD_TEST=ON
#     cmake --build build_icx --config Release
#
# To build the CUDA interop test (test/test.cu); see that file's docstring for what it covers and the
# GPU compatibility notes. Requires nvcc on PATH.
#
#     cmake -B build_cuda -D NK_BUILD_CUDA_TEST=ON
#     cmake --build build_cuda
#     ctest --test-dir build_cuda -R cuda --output-on-failure
#
# If your system CMake is older than 3.20, install a recent release from PyPI or the Kitware APT repo.
#
#     python -m pip install "cmake>=3.20"
#
# NumKong does not support NVHPC (nvc and nvc++): those compilers cannot apply per-function
# __attribute__((target(...))), which is how SIMD kernels are dispatched in this library.
#
cmake_minimum_required(VERSION 3.20 FATAL_ERROR)

# Leverage `ccache` for incremental compilation
find_program(CCACHE_PROGRAM ccache)

if (CCACHE_PROGRAM)
    set(CMAKE_C_COMPILER_LAUNCHER "${CCACHE_PROGRAM}")
    set(CMAKE_CXX_COMPILER_LAUNCHER "${CCACHE_PROGRAM}")
    message(STATUS "Using ccache: ${CCACHE_PROGRAM}")
    message(STATUS "IMPORTANT: Set environment variable CCACHE_SLOPPINESS=pch_defines,time_macros")
endif ()

#
project(
    numkong
    VERSION 7.7.1
    LANGUAGES C CXX
    DESCRIPTION "Portable mixed-precision BLAS-like vector math library for x86 and ARM"
    HOMEPAGE_URL "https://github.com/ashvardanian/NumKong"
)

set(CMAKE_C_STANDARD 99)
set(CMAKE_C_STANDARD_REQUIRED YES)

# Enable GNU extensions for WASM (required for EM_ASM runtime detection)
if (CMAKE_SYSTEM_NAME STREQUAL "Emscripten")
    set(CMAKE_C_EXTENSIONS YES)
else ()
    set(CMAKE_C_EXTENSIONS NO)
endif ()

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED YES)
set(CMAKE_CXX_EXTENSIONS NO)

# Determine if NumKong is built as a sub-project (using `add_subdirectory`) or if it is the main project
set(NK_IS_MAIN_PROJECT_ OFF)
set(NK_IS_WASI_PROJECT_ OFF)

if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
    set(NK_IS_MAIN_PROJECT_ ON)
endif ()

if (CMAKE_SYSTEM_NAME STREQUAL "WASI")
    set(NK_IS_WASI_PROJECT_ ON)
endif ()

option(NK_BUILD_SHARED "Compile a dynamic library" ${NK_IS_MAIN_PROJECT_})
option(NK_BUILD_TEST "Compile precision tests with ULP-based error analysis" OFF)
option(NK_BUILD_BENCH "Compile micro-benchmarks for current ISA" OFF)
option(NK_BUILD_CUDA_TEST "Compile CUDA tensors & type system interop tests" OFF)
option(NK_BUILD_SHARED_TEST "Compile shared-library tests, requires NK_BUILD_SHARED" OFF)
option(NK_WASI_HOSTED "Import capability probes from WASI host environment" OFF)

option(NK_MARCH_NATIVE "Build with -march=native (host-tuned, not portable)" OFF)

# `add_test()` entries are only generated when testing is enabled.
if (NK_BUILD_TEST OR NK_BUILD_SHARED_TEST OR NK_BUILD_CUDA_TEST)
    enable_testing()
endif ()

# BLAS/MKL options: ON (require), OFF (disable), AUTO (detect if available)
set(NK_COMPARE_TO_BLAS "AUTO" CACHE STRING "Include BLAS (OpenBLAS/Accelerate) in tests and benchmarks")
set(NK_COMPARE_TO_MKL "AUTO" CACHE STRING "Include Intel MKL in tests and benchmarks")
set_property(CACHE NK_COMPARE_TO_BLAS PROPERTY STRINGS "AUTO" "ON" "OFF")
set_property(CACHE NK_COMPARE_TO_MKL PROPERTY STRINGS "AUTO" "ON" "OFF")

# Default to Release build type if not set
if (NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE Release)
endif ()

# Generate compile_commands.json for clang-tidy and other tooling
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

# MSVC does not set `CMAKE_SYSTEM_PROCESSOR` correctly
# Use `CMAKE_C_COMPILER_ARCHITECTURE_ID` instead
if (MSVC)
    if (CMAKE_C_COMPILER_ARCHITECTURE_ID MATCHES "x64")
        set(CMAKE_SYSTEM_PROCESSOR "AMD64")
    elseif (CMAKE_C_COMPILER_ARCHITECTURE_ID MATCHES "X86")
        set(CMAKE_SYSTEM_PROCESSOR "X86")
    elseif (CMAKE_C_COMPILER_ARCHITECTURE_ID MATCHES "ARM64")
        set(CMAKE_SYSTEM_PROCESSOR "ARM64")
    else ()
        message(WARNING "Unknown CMAKE_C_COMPILER_ARCHITECTURE_ID=${CMAKE_C_COMPILER_ARCHITECTURE_ID}")
    endif ()
endif ()

# Detect target architecture from CMAKE_SYSTEM_PROCESSOR (safe for cross-compilation)
if (CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64|X86_64|AMD64|amd64")
    set(NK_IS_64BIT_X86_ TRUE)
    message(STATUS "NumKong Platform: x86_64 (CMAKE_SYSTEM_PROCESSOR=${CMAKE_SYSTEM_PROCESSOR})")
elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64|AARCH64|arm64|ARM64")
    set(NK_IS_64BIT_ARM_ TRUE)
    message(STATUS "NumKong Platform: ARM64 (CMAKE_SYSTEM_PROCESSOR=${CMAKE_SYSTEM_PROCESSOR})")
elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "riscv64|RISCV64")
    set(NK_IS_64BIT_RISCV_ TRUE)
    message(STATUS "NumKong Platform: RISC-V 64 (CMAKE_SYSTEM_PROCESSOR=${CMAKE_SYSTEM_PROCESSOR})")
elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "loongarch64|LOONGARCH64")
    set(NK_IS_64BIT_LOONGARCH_ TRUE)
    message(STATUS "NumKong Platform: LoongArch 64 (CMAKE_SYSTEM_PROCESSOR=${CMAKE_SYSTEM_PROCESSOR})")
elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "ppc64le|ppc64|powerpc64le|powerpc64")
    set(NK_IS_64BIT_POWER_ TRUE)
    message(STATUS "NumKong Platform: Power 64 (CMAKE_SYSTEM_PROCESSOR=${CMAKE_SYSTEM_PROCESSOR})")
elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "^arm|^ARM|armv7")
    set(NK_IS_32BIT_ARM_ TRUE)
    message(STATUS "NumKong Platform: ARM32 (CMAKE_SYSTEM_PROCESSOR=${CMAKE_SYSTEM_PROCESSOR})")
else ()
    message(WARNING "Unknown CMAKE_SYSTEM_PROCESSOR: ${CMAKE_SYSTEM_PROCESSOR}")
endif ()

# Detect target OS for platform-specific optimizations
if (CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
    set(NK_IS_FREEBSD_ TRUE)
    message(STATUS "NumKong OS: FreeBSD")
elseif (CMAKE_SYSTEM_NAME STREQUAL "Linux")
    set(NK_IS_LINUX_ TRUE)
    message(STATUS "NumKong OS: Linux")
elseif (CMAKE_SYSTEM_NAME STREQUAL "Android")
    set(NK_IS_ANDROID_ TRUE)
    message(STATUS "NumKong OS: Android (API level ${ANDROID_NATIVE_API_LEVEL})")
elseif (CMAKE_SYSTEM_NAME STREQUAL "Darwin")
    set(NK_IS_MACOS_ TRUE)
    message(STATUS "NumKong OS: macOS")
elseif (CMAKE_SYSTEM_NAME STREQUAL "iOS")
    set(NK_IS_IOS_ TRUE)
    message(STATUS "NumKong OS: iOS")
elseif (CMAKE_SYSTEM_NAME STREQUAL "Windows" OR WIN32)
    set(NK_IS_WINDOWS_ TRUE)
    message(STATUS "NumKong OS: Windows")
endif ()

# Global compiler flags for debug and release
include(CheckCXXSourceCompiles)
set(CMAKE_REQUIRED_FLAGS "-fsanitize=address")
check_cxx_source_compiles("int main(){return 0;}" NK_HAS_ASAN_)
unset(CMAKE_REQUIRED_FLAGS)

if (NK_HAS_ASAN_)
    set(CMAKE_CXX_FLAGS_DEBUG "-g -fsanitize=address")
    set(CMAKE_C_FLAGS_DEBUG "-g -fsanitize=address")
else ()
    set(CMAKE_CXX_FLAGS_DEBUG "-g")
    set(CMAKE_C_FLAGS_DEBUG "-g")
    message(STATUS "AddressSanitizer not available, Debug builds without ASAN")
endif ()

if (MSVC)
    set(CMAKE_CXX_FLAGS_RELEASE "/O2 /Gw /DNDEBUG")
    set(CMAKE_C_FLAGS_RELEASE "/O2 /Gw /DNDEBUG")
else ()
    set(CMAKE_CXX_FLAGS_RELEASE "-O3 -DNDEBUG")
    set(CMAKE_C_FLAGS_RELEASE "-O3 -DNDEBUG")
endif ()

# Probe link-time optimization once and reuse it: the shared library, the tests, and the
# benchmarks all get IPO for Release builds so the exact `-O3 + LTO` codegen that ships also
# runs in the test suite. LTO-only miscompiles are otherwise invisible — e.g. cross-TU
# unrolling of a runtime-bounded loop can speculatively divide by a tensor shape's zero-filled
# spare extents and trap (#DE / SIGFPE); see shape_storage_::normalize_spare_.
include(CheckIPOSupported)
check_ipo_supported(RESULT NK_IPO_SUPPORTED_ OUTPUT NK_IPO_SUPPORT_OUTPUT_)
if (NOT NK_IPO_SUPPORTED_)
    message(STATUS "Link-time optimization not available: ${NK_IPO_SUPPORT_OUTPUT_}")
endif ()

# Portable baseline policy (commits 43e8324d, 453ed5ff, 23f51955): each translation unit gets a per-arch
# ABI floor, auto-vectorization is forbidden so serial fallbacks stay scalar, and SIMD kernels opt in via
# per-function __attribute__((target(...))) or #pragma GCC target. NK_MARCH_NATIVE=ON opts out for a
# host-tuned build. Keep the per-arch table in sync with build.rs, setup.py, and binding.gyp.
if (NK_MARCH_NATIVE AND NOT MSVC AND NOT CMAKE_CROSSCOMPILING)
    message(WARNING "NK_MARCH_NATIVE=ON: baking host-specific instructions; result will not run on older CPUs")
    if (CMAKE_CXX_COMPILER_ID MATCHES "^(GNU|Clang|AppleClang|IntelLLVM)$")
        # Apple Clang's `-march=native` only advertises a subset of host features
        # (no SME/SME2/FP16_FML); `-mcpu=native` is the complete knob on macOS.
        # GCC/Clang on Linux/FreeBSD use `-march=native` as usual.
        if (APPLE)
            add_compile_options(-mcpu=native)
        else ()
            add_compile_options(-march=native)
        endif ()
    endif ()
elseif (CMAKE_CXX_COMPILER_ID MATCHES "^(GNU|Clang|AppleClang|IntelLLVM)$")
    # Clang and IntelLLVM accept the GCC spellings as aliases, so one pair covers all three compilers.
    add_compile_options(-fno-tree-vectorize -fno-tree-slp-vectorize)
    if (NK_IS_64BIT_ARM_)
        add_compile_options(-march=armv8-a)
    elseif (NK_IS_64BIT_X86_)
        add_compile_options(-march=x86-64)
    elseif (NK_IS_64BIT_RISCV_)
        add_compile_options(-march=rv64gc)
    elseif (NK_IS_64BIT_POWER_)
        add_compile_options(-mcpu=power8)
    elseif (NK_IS_64BIT_LOONGARCH_)
        # LASX needs TU-level `-mlasx` until GCC >= 15 / Clang >= 22 ship per-function support.
        add_compile_options(-march=loongarch64 -mlasx)
    endif ()
elseif (MSVC)
    # MSVC: no per-function target pragma; these match defaults.
    if (NK_IS_64BIT_X86_)
        add_compile_options(/arch:SSE2)
    elseif (NK_IS_64BIT_ARM_)
        add_compile_options(/arch:armv8.0)
    endif ()
endif ()

if (CMAKE_CXX_COMPILER_ID MATCHES "^(GNU|Clang|AppleClang|IntelLLVM)$")
    add_compile_options(-pedantic)
endif ()

if (CMAKE_CXX_COMPILER_ID MATCHES "^(Clang|AppleClang|IntelLLVM)$")
    add_compile_options(-ferror-limit=1 -Wno-typedef-redefinition -Wno-tautological-constant-compare)
elseif (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
    add_compile_options(-fmax-errors=1 -Wno-tautological-constant-compare -Wno-psabi)
endif ()

# Define the header-only library
file(GLOB NK_SOURCES include/numkong/*.h include/numkong/*.hpp)
add_library(numkong INTERFACE)
target_sources(numkong INTERFACE ${NK_SOURCES})
target_include_directories(numkong INTERFACE "${PROJECT_SOURCE_DIR}/include")

# MSVC's traditional preprocessor can't short-circuit `defined(__has_builtin) && __has_builtin(...)`.
# The conforming preprocessor (/Zc:preprocessor, available since MSVC 2019 16.6) handles this.
# Scoped via INTERFACE so it propagates only to targets that link against numkong.
if (MSVC)
    target_compile_options(numkong INTERFACE /Zc:preprocessor)
endif ()

# Enable Clang C modules for incremental compilation
if (CMAKE_C_COMPILER_ID MATCHES "Clang")
    target_compile_options(
        numkong INTERFACE $<$<COMPILE_LANGUAGE:C>:-fmodules> $<$<COMPILE_LANGUAGE:C>:-fimplicit-module-maps>
                          $<$<COMPILE_LANGUAGE:C>:-fmodules-cache-path=${CMAKE_BINARY_DIR}/module-cache>
    )

    # Install module map
    install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/include/module.modulemap DESTINATION include)

    message(STATUS "Clang C modules enabled: cache at ${CMAKE_BINARY_DIR}/module-cache")
endif ()

# BLAS/MKL detection (shared by tests and benchmarks)
# Options can be: ON (require), OFF (disable), AUTO (detect if available)
set(NK_BLAS_FOUND FALSE)
set(NK_MKL_FOUND FALSE)

# Skip BLAS/MKL/Accelerate detection when cross-compiling (host libraries won't work)
if (CMAKE_CROSSCOMPILING)
    if (NK_COMPARE_TO_MKL STREQUAL "AUTO")
        message(STATUS "Cross-compiling: skipping MKL detection (host library)")
        set(NK_COMPARE_TO_MKL "OFF")
    endif ()

    if (NK_COMPARE_TO_BLAS STREQUAL "AUTO")
        message(STATUS "Cross-compiling: skipping BLAS detection (host library)")
        set(NK_COMPARE_TO_BLAS "OFF")
    endif ()
endif ()

# Probe whether C++ test executables need an explicit math library (`-lm`) on this toolchain.
set(NK_CXX_MATH_LIB_ "")
if (NK_BUILD_TEST OR NK_BUILD_SHARED_TEST)
    include(cmake/nk_math_lib.cmake)
    nk_detect_cxx_math_lib_(NK_CXX_MATH_LIB_)
    message(STATUS "NumKong: Explicit libm for C++ tests: ${NK_CXX_MATH_LIB_}")
endif ()

# Only attempt detection if building tests or benchmarks
if (NK_BUILD_TEST OR NK_BUILD_BENCH)
    # MKL detection
    if (NOT NK_COMPARE_TO_MKL STREQUAL "OFF")
        # Use environment variable MKLROOT or standard MKL paths
        if (DEFINED ENV{MKLROOT})
            set(MKL_ROOT $ENV{MKLROOT})
        else ()
            # Try common installation paths
            if (EXISTS "/opt/intel/oneapi/mkl/latest")
                set(MKL_ROOT "/opt/intel/oneapi/mkl/latest")
            elseif (EXISTS "/opt/intel/mkl")
                set(MKL_ROOT "/opt/intel/mkl")
            endif ()
        endif ()

        if (MKL_ROOT)
            # Verify the libraries actually exist (prefer shared libraries for simpler linking)
            if (EXISTS "${MKL_ROOT}/lib/libmkl_intel_lp64.so")
                message(STATUS "MKL found at: ${MKL_ROOT}")
                set(NK_MKL_FOUND TRUE)
                set(NK_MKL_INCLUDE_DIRS ${MKL_ROOT}/include)
                set(NK_MKL_LIBRARIES ${MKL_ROOT}/lib/libmkl_intel_lp64.so ${MKL_ROOT}/lib/libmkl_sequential.so
                                     ${MKL_ROOT}/lib/libmkl_core.so pthread m dl
                )
            elseif (EXISTS "${MKL_ROOT}/lib/intel64/libmkl_intel_lp64.a")
                # Fallback to static libraries (Linux/FreeBSD)
                message(STATUS "MKL found at: ${MKL_ROOT} (static)")
                set(NK_MKL_FOUND TRUE)
                set(NK_MKL_INCLUDE_DIRS ${MKL_ROOT}/include)
                set(NK_MKL_LIBRARIES
                    -Wl,--start-group ${MKL_ROOT}/lib/intel64/libmkl_intel_lp64.a
                    ${MKL_ROOT}/lib/intel64/libmkl_sequential.a ${MKL_ROOT}/lib/intel64/libmkl_core.a -Wl,--end-group
                    pthread m dl
                )
            elseif (EXISTS "${MKL_ROOT}/lib/mkl_intel_lp64_dll.lib")
                # Windows import libraries
                message(STATUS "MKL found at: ${MKL_ROOT} (Windows)")
                set(NK_MKL_FOUND TRUE)
                set(NK_MKL_INCLUDE_DIRS ${MKL_ROOT}/include)
                set(NK_MKL_LIBRARIES ${MKL_ROOT}/lib/mkl_intel_lp64_dll.lib ${MKL_ROOT}/lib/mkl_sequential_dll.lib
                                     ${MKL_ROOT}/lib/mkl_core_dll.lib
                )
            elseif (NK_COMPARE_TO_MKL STREQUAL "ON")
                message(FATAL_ERROR "MKL libraries not found at ${MKL_ROOT}/lib/")
            else ()
                message(STATUS "MKL directory found but libraries missing, skipping MKL")
            endif ()
        elseif (NK_COMPARE_TO_MKL STREQUAL "ON")
            message(FATAL_ERROR "MKL not found. Set MKLROOT environment variable or install Intel oneAPI.")
        else ()
            message(STATUS "MKL not found (auto-detection), skipping MKL benchmarks")
        endif ()
    endif ()

    # BLAS detection (skip if MKL found in AUTO mode, since MKL provides BLAS)
    # We differentiate between:
    # - NK_MKL_FOUND: Intel MKL
    # - NK_ACCELERATE_FOUND: Apple Accelerate framework
    # - NK_BLAS_FOUND: Generic CBLAS (OpenBLAS, etc.)
    if (NOT NK_COMPARE_TO_BLAS STREQUAL "OFF")
        if (NK_MKL_FOUND AND NOT NK_COMPARE_TO_BLAS STREQUAL "ON")
            message(STATUS "BLAS: Using MKL (skipping separate BLAS detection)")
        elseif (APPLE)
            # Apple Accelerate is always available on macOS
            message(STATUS "Using Apple Accelerate framework")
            set(NK_ACCELERATE_FOUND TRUE)
            set(NK_ACCELERATE_LIBRARIES "-framework Accelerate")
            set(NK_ACCELERATE_INCLUDE_DIRS "")
        else ()
            # Try to find BLAS without REQUIRED flag for auto-detection
            find_package(BLAS QUIET)

            if (BLAS_FOUND)
                message(STATUS "BLAS found: ${BLAS_LIBRARIES}")
                set(NK_BLAS_FOUND TRUE)
                set(NK_BLAS_LIBRARIES ${BLAS_LIBRARIES})
                set(NK_BLAS_INCLUDE_DIRS ${BLAS_INCLUDE_DIRS})
            elseif (NK_COMPARE_TO_BLAS STREQUAL "ON")
                message(FATAL_ERROR "BLAS not found. Install OpenBLAS or set NK_COMPARE_TO_BLAS=OFF")
            else ()
                message(STATUS "BLAS not found (auto-detection), skipping BLAS benchmarks")
            endif ()
        endif ()
    endif ()

    # Summary
    if (NK_BLAS_FOUND OR NK_MKL_FOUND OR NK_ACCELERATE_FOUND)
        message(
            STATUS "Comparison libraries: BLAS=${NK_BLAS_FOUND}, MKL=${NK_MKL_FOUND}, Accelerate=${NK_ACCELERATE_FOUND}"
        )
    endif ()
endif ()

# x86 ISA runtime probes — detect host CPU capabilities at configure time.
# See cmake/nk_x86_isa_probes.cmake for details and probe definitions.
include(cmake/nk_x86_isa_probes.cmake)

# Arm ISA runtime probes — detect host CPU capabilities at configure time.
# See cmake/nk_arm_isa_probes.cmake for details and probe definitions.
include(cmake/nk_arm_isa_probes.cmake)

# LoongArch ISA runtime probes — detect LASX capability at configure time.
# See cmake/nk_loongarch_isa_probes.cmake for details and probe definitions.
include(cmake/nk_loongarch_isa_probes.cmake)

# Power ISA runtime probes — detect VSX capability at configure time.
# See cmake/nk_power_isa_probes.cmake for details and probe definitions.
include(cmake/nk_power_isa_probes.cmake)

# RISC-V ISA runtime probes — detect RVV capability at configure time.
# See cmake/nk_riscv_isa_probes.cmake for details and probe definitions.
include(cmake/nk_riscv_isa_probes.cmake)

# Build benchmarks
if (NK_BUILD_BENCH)
    # Fetch external dependencies
    include(FetchContent)

    # We only need the core parts of Google Benchmark — disable tests, docs, and
    # force std::regex so the regex-backend detection (which uses try_run) doesn't
    # fail when ASAN is enabled and the sanitizer DLL isn't on PATH at configure time.
    # All variables are CACHE entries scoped to the benchmark sub-project via FetchContent.
    set(BENCHMARK_ENABLE_TESTING OFF CACHE BOOL "" FORCE)
    set(BENCHMARK_ENABLE_INSTALL OFF CACHE BOOL "" FORCE)
    set(BENCHMARK_ENABLE_DOXYGEN OFF CACHE BOOL "" FORCE)
    set(BENCHMARK_INSTALL_DOCS OFF CACHE BOOL "" FORCE)
    set(BENCHMARK_DOWNLOAD_DEPENDENCIES ON CACHE BOOL "" FORCE)
    set(BENCHMARK_ENABLE_GTEST_TESTS OFF CACHE BOOL "" FORCE)
    set(BENCHMARK_USE_BUNDLED_GTEST ON CACHE BOOL "" FORCE)
    set(HAVE_STD_REGEX ON CACHE BOOL "Force std::regex for Google Benchmark" FORCE)

    FetchContent_Declare(benchmark GIT_REPOSITORY https://github.com/google/benchmark.git GIT_TAG main)
    FetchContent_MakeAvailable(benchmark)

    # Remove the Google Benchmark's "built in debug warning"
    if (CMAKE_BUILD_TYPE STREQUAL "Release")
        target_compile_definitions(benchmark PRIVATE NDEBUG)
    endif ()

    find_package(Threads REQUIRED)
    add_executable(
        nk_bench
        bench/bench.cpp bench/bench_dot.cpp bench/bench_spatial.cpp bench/bench_set.cpp bench/bench_curved.cpp
        bench/bench_probability.cpp bench/bench_each.cpp bench/bench_trigonometry.cpp bench/bench_geospatial.cpp
        bench/bench_mesh.cpp bench/bench_sparse.cpp bench/bench_cast.cpp bench/bench_reduce.cpp
        # ISA-family cross/batch files for parallel compilation
        bench/bench_cross_serial.cpp bench/bench_cross_x86.cpp bench/bench_cross_amx.cpp bench/bench_cross_arm.cpp
        bench/bench_cross_sme.cpp bench/bench_cross_blas.cpp bench/bench_cross_rvv.cpp bench/bench_cross_power.cpp
        bench/bench_cross_wasm.cpp bench/bench_cross_loongarch.cpp bench/bench_maxsim.cpp
    )
    target_link_libraries(nk_bench numkong Threads::Threads benchmark)

    # Mirror the shipped Release codegen.
    if (NK_IPO_SUPPORTED_)
        set_target_properties(nk_bench PROPERTIES INTERPROCEDURAL_OPTIMIZATION_RELEASE TRUE)
    endif ()

    # WASI-specific configuration for benchmarks
    if (NK_IS_WASI_PROJECT_)
        if (NK_WASI_HOSTED)
            target_compile_definitions(nk_bench PRIVATE NK_DEFINED_WASI_=1)
        endif ()

        set_target_properties(nk_bench PROPERTIES OUTPUT_NAME "nk_bench.wasm")
        target_link_options(nk_bench PRIVATE -Wl,--export=main -Wl,--export=_start)
        message(STATUS "NumKong: Building benchmarks for WASI (output: nk_bench.wasm)")
    endif ()

    if (NK_BLAS_FOUND AND NOT NK_IS_WASI_PROJECT_)
        target_compile_definitions(nk_bench PRIVATE NK_COMPARE_TO_BLAS=1)
        target_include_directories(nk_bench PRIVATE ${NK_BLAS_INCLUDE_DIRS})
        target_link_libraries(nk_bench ${NK_BLAS_LIBRARIES})
    endif ()

    if (NK_ACCELERATE_FOUND AND NOT NK_IS_WASI_PROJECT_)
        target_compile_definitions(nk_bench PRIVATE NK_COMPARE_TO_ACCELERATE=1 ACCELERATE_NEW_LAPACK)
        target_include_directories(nk_bench PRIVATE ${NK_ACCELERATE_INCLUDE_DIRS})
        target_link_libraries(nk_bench ${NK_ACCELERATE_LIBRARIES})
    endif ()

    if (NK_MKL_FOUND AND NOT NK_IS_WASI_PROJECT_)
        target_compile_definitions(nk_bench PRIVATE NK_COMPARE_TO_MKL=1)
        target_include_directories(nk_bench PRIVATE ${NK_MKL_INCLUDE_DIRS})
        target_link_libraries(nk_bench ${NK_MKL_LIBRARIES})
    endif ()

    if (nk_x86_native_defs_)
        target_compile_definitions(nk_bench PRIVATE ${nk_x86_native_defs_})
    endif ()

    if (nk_arm_native_defs_)
        target_compile_definitions(nk_bench PRIVATE ${nk_arm_native_defs_})
    endif ()

    if (nk_riscv_native_defs_)
        target_compile_definitions(nk_bench PRIVATE ${nk_riscv_native_defs_})
    endif ()

    if (nk_loongarch_native_defs_)
        target_compile_definitions(nk_bench PRIVATE ${nk_loongarch_native_defs_})
    endif ()

    if (nk_power_native_defs_)
        target_compile_definitions(nk_bench PRIVATE ${nk_power_native_defs_})
    endif ()
endif ()

# Dtype-specific dispatch sources (for parallel compilation)
set(NK_DTYPE_SOURCES
    c/dispatch_f64c.c c/dispatch_f32c.c c/dispatch_bf16c.c c/dispatch_f16c.c c/dispatch_f64.c c/dispatch_f32.c
    c/dispatch_bf16.c c/dispatch_f16.c c/dispatch_e5m2.c c/dispatch_e4m3.c c/dispatch_e3m2.c c/dispatch_e2m3.c
    c/dispatch_i64.c c/dispatch_i32.c c/dispatch_i16.c c/dispatch_i8.c c/dispatch_i4.c c/dispatch_u64.c
    c/dispatch_u32.c c/dispatch_u16.c c/dispatch_u8.c c/dispatch_u4.c c/dispatch_u1.c c/dispatch_other.c
)

# Build tests
if (NK_BUILD_TEST)
    # C++ precision test (ULP-based error analysis)
    add_executable(
        nk_test
        test/test.cpp test/test_dot.cpp test/test_spatial.cpp test/test_set.cpp test/test_curved.cpp
        test/test_probability.cpp test/test_each.cpp test/test_trigonometry.cpp test/test_geospatial.cpp
        test/test_mesh.cpp test/test_cast.cpp test/test_reduce.cpp test/test_sparse.cpp
        # ISA-family cross/batch files for parallel compilation
        test/test_cross_serial.cpp test/test_cross_x86.cpp test/test_cross_amx.cpp test/test_cross_arm.cpp
        test/test_cross_sme.cpp test/test_cross_blas.cpp test/test_cross_rvv.cpp test/test_cross_power.cpp
        test/test_cross_loongarch.cpp test/test_cross_wasm.cpp test/test_maxsim.cpp test/test_tensor.cpp
    )
    target_link_libraries(nk_test numkong ${NK_CXX_MATH_LIB_})

    # Mirror the shipped Release codegen.
    if (NK_IPO_SUPPORTED_)
        set_target_properties(nk_test PROPERTIES INTERPROCEDURAL_OPTIMIZATION_RELEASE TRUE)
    endif ()

    # WASI-specific configuration
    if (NK_IS_WASI_PROJECT_)
        if (NK_WASI_HOSTED)
            target_compile_definitions(nk_test PRIVATE NK_DEFINED_WASI_=1)
        endif ()

        set_target_properties(nk_test PROPERTIES OUTPUT_NAME "nk_test.wasm")
        target_link_options(nk_test PRIVATE -Wl,--export=main -Wl,--export=_start)
        message(STATUS "NumKong: Building tests for WASI (output: nk_test.wasm)")
    endif ()

    if (NK_BLAS_FOUND AND NOT NK_IS_WASI_PROJECT_)
        target_compile_definitions(nk_test PRIVATE NK_COMPARE_TO_BLAS=1)
        target_include_directories(nk_test PRIVATE ${NK_BLAS_INCLUDE_DIRS})
        target_link_libraries(nk_test ${NK_BLAS_LIBRARIES})
    endif ()

    if (NK_ACCELERATE_FOUND AND NOT NK_IS_WASI_PROJECT_)
        target_compile_definitions(nk_test PRIVATE NK_COMPARE_TO_ACCELERATE=1 ACCELERATE_NEW_LAPACK)
        target_include_directories(nk_test PRIVATE ${NK_ACCELERATE_INCLUDE_DIRS})
        target_link_libraries(nk_test ${NK_ACCELERATE_LIBRARIES})
    endif ()

    if (NK_MKL_FOUND AND NOT NK_IS_WASI_PROJECT_)
        target_compile_definitions(nk_test PRIVATE NK_COMPARE_TO_MKL=1)
        target_include_directories(nk_test PRIVATE ${NK_MKL_INCLUDE_DIRS})
        target_link_libraries(nk_test ${NK_MKL_LIBRARIES})
    endif ()

    if (nk_x86_native_defs_)
        target_compile_definitions(nk_test PRIVATE ${nk_x86_native_defs_})
    endif ()

    if (nk_arm_native_defs_)
        target_compile_definitions(nk_test PRIVATE ${nk_arm_native_defs_})
    endif ()

    if (nk_riscv_native_defs_)
        target_compile_definitions(nk_test PRIVATE ${nk_riscv_native_defs_})
    endif ()

    if (nk_loongarch_native_defs_)
        target_compile_definitions(nk_test PRIVATE ${nk_loongarch_native_defs_})
    endif ()

    if (nk_power_native_defs_)
        target_compile_definitions(nk_test PRIVATE ${nk_power_native_defs_})
    endif ()

    add_test(NAME nk_test COMMAND nk_test)
endif ()

# Shared library (or Emscripten JS module)
if (NK_BUILD_SHARED)
    set(NK_SOURCES ${NK_SOURCES} c/numkong.c ${NK_DTYPE_SOURCES})

    # Emscripten requires building as executable to generate JS bindings
    if (CMAKE_SYSTEM_NAME STREQUAL "Emscripten")
        # Detect wasm64 (memory64) mode
        if (CMAKE_SYSTEM_PROCESSOR STREQUAL "wasm64")
            set(NK_WASM64_ ON)
        else ()
            set(NK_WASM64_ OFF)
        endif ()

        # Create a minimal main() wrapper for Emscripten
        file(WRITE "${CMAKE_BINARY_DIR}/emscripten_stub.c"
             "// Stub main for Emscripten to generate JS bindings\nint main() { return 0; }\n"
        )

        add_executable(nk_shared ${NK_SOURCES} "${CMAKE_BINARY_DIR}/emscripten_stub.c")
        target_include_directories(nk_shared PUBLIC "${PROJECT_SOURCE_DIR}/include")

        if (NK_WASM64_)
            set_target_properties(
                nk_shared PROPERTIES OUTPUT_NAME "numkong64" SUFFIX ".js" # Generates numkong64.js + numkong64.wasm
            )
        else ()
            set_target_properties(
                nk_shared PROPERTIES OUTPUT_NAME "numkong" SUFFIX ".js" # Generates numkong.js + numkong.wasm
            )
        endif ()
        target_compile_definitions(
            nk_shared
            PRIVATE NK_TARGET_HASWELL=0 NK_TARGET_SKYLAKE=0 NK_TARGET_ICELAKE=0 NK_TARGET_GENOA=0 NK_TARGET_SAPPHIRE=0
                    NK_TARGET_SAPPHIREAMX=0 NK_TARGET_GRANITEAMX=0 NK_TARGET_DIAMOND=0 NK_TARGET_TURIN=0
                    NK_TARGET_ALDER=0 NK_TARGET_SIERRA=0 NK_TARGET_NEON=0 NK_TARGET_NEONHALF=0 NK_TARGET_NEONSDOT=0
                    NK_TARGET_NEONBFDOT=0 NK_TARGET_NEONFHM=0 NK_TARGET_NEONFP8=0 NK_TARGET_SVE=0 NK_TARGET_SVEHALF=0
                    NK_TARGET_SVEBFDOT=0 NK_TARGET_SVESDOT=0 NK_TARGET_SVE2=0 NK_TARGET_SVE2P1=0 NK_TARGET_SME=0
                    NK_TARGET_SME2=0 NK_TARGET_SME2P1=0 NK_TARGET_SMEF64=0 NK_TARGET_SMEHALF=0 NK_TARGET_SMEBF16=0
                    NK_TARGET_SMEBI32=0 NK_TARGET_SMELUT2=0 NK_TARGET_SMEFA64=0 NK_TARGET_RVV=0 NK_TARGET_RVVHALF=0
                    NK_TARGET_RVVBF16=0 NK_TARGET_RVVBB=0 NK_TARGET_V128RELAXED=1
        )

        target_link_options(
            nk_shared
            PRIVATE
            "SHELL:-sEXPORT_ES6=1" # Generate ES6 module
            "SHELL:-sMODULARIZE=1" # Wrap in module factory
            "SHELL:-sEXPORT_NAME=NumKongModule" # Export name
            "SHELL:-sEXPORTED_FUNCTIONS=['_malloc','_free','_nk_dot_f32','_nk_dot_f64','_nk_dot_f16','_nk_dot_bf16','_nk_dot_i8','_nk_dot_u8','_nk_angular_f32','_nk_angular_f64','_nk_angular_f16','_nk_angular_bf16','_nk_angular_i8','_nk_angular_u8','_nk_sqeuclidean_f32','_nk_sqeuclidean_f64','_nk_sqeuclidean_f16','_nk_sqeuclidean_bf16','_nk_sqeuclidean_i8','_nk_sqeuclidean_u8','_nk_euclidean_f32','_nk_euclidean_f64','_nk_euclidean_f16','_nk_euclidean_bf16','_nk_euclidean_i8','_nk_euclidean_u8','_nk_hamming_u1','_nk_hamming_u8','_nk_jaccard_u1','_nk_jaccard_u16','_nk_kld_f32','_nk_kld_f64','_nk_jsd_f32','_nk_jsd_f64','_nk_capabilities','_nk_dots_packed_size_f32','_nk_dots_packed_size_f64','_nk_dots_packed_size_f16','_nk_dots_packed_size_bf16','_nk_dots_packed_size_i8','_nk_dots_packed_size_u8','_nk_dots_pack_f32','_nk_dots_pack_f64','_nk_dots_pack_f16','_nk_dots_pack_bf16','_nk_dots_pack_i8','_nk_dots_pack_u8','_nk_dots_packed_f32','_nk_dots_packed_f64','_nk_dots_packed_f16','_nk_dots_packed_bf16','_nk_dots_packed_i8','_nk_dots_packed_u8','_nk_dots_symmetric_f32','_nk_dots_symmetric_f64','_nk_dots_symmetric_f16','_nk_dots_symmetric_bf16','_nk_dots_symmetric_i8','_nk_dots_symmetric_u8','_nk_angulars_packed_f32','_nk_angulars_packed_f64','_nk_angulars_packed_f16','_nk_angulars_packed_bf16','_nk_angulars_symmetric_f32','_nk_angulars_symmetric_f64','_nk_angulars_symmetric_f16','_nk_angulars_symmetric_bf16','_nk_euclideans_packed_f32','_nk_euclideans_packed_f64','_nk_euclideans_packed_f16','_nk_euclideans_packed_bf16','_nk_euclideans_symmetric_f32','_nk_euclideans_symmetric_f64','_nk_euclideans_symmetric_f16','_nk_euclideans_symmetric_bf16']"
            "SHELL:-sEXPORTED_RUNTIME_METHODS=['wasmMemory']" # Export memory object
            "SHELL:-sALLOW_MEMORY_GROWTH=1" # Dynamic memory
            "SHELL:-sENVIRONMENT=web,node" # Both browser and Node.js
            "SHELL:-sSINGLE_FILE=0" # Separate .wasm file (recommended)
            "SHELL:-sEXPORT_ALL=0" # Security - don't export everything
            "SHELL:-sSTANDALONE_WASM=0" # Keep JS wrapper (required for browser)
            "SHELL:-sINITIAL_MEMORY=16MB" # Initial heap size
            "SHELL:-sSTACK_SIZE=5MB" # Stack size for recursion
        )

        # Memory64 link option for wasm64 builds
        if (NK_WASM64_)
            target_link_options(nk_shared PRIVATE "SHELL:-s MEMORY64=1")
        endif ()

        # Under Emscripten nk_shared is an executable (.js/.wasm), not a shared
        # library. CMake refuses target_link_libraries against an imported
        # executable unless it exports its symbol table. Upstream projects that
        # add_subdirectory(numkong) and link to nk_shared need this.
        set_target_properties(nk_shared PROPERTIES ENABLE_EXPORTS ON)
    else ()
        add_library(nk_shared SHARED ${NK_SOURCES})
        target_include_directories(nk_shared PUBLIC "${PROJECT_SOURCE_DIR}/include")
        set_target_properties(nk_shared PROPERTIES OUTPUT_NAME numkong)

        # Hide all symbols by default; only NK_DYNAMIC-annotated API functions are exported.
        # Strip unwind tables from this pure-C library (saves ~78 KB).
        if (NOT MSVC)
            target_compile_options(
                nk_shared PRIVATE -fvisibility=hidden -fno-asynchronous-unwind-tables -fno-builtin-memset
                                  -fno-builtin-memcpy -fno-builtin-memmove
            )
            if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
                target_compile_options(nk_shared PRIVATE -fno-tree-loop-distribute-patterns)
            endif ()
        endif ()

        # MSVC ARM64 cross-compilation: <intrin.h> pulls in <winnt.h> which
        # requires _ARM64_ to be defined. The Visual Studio generator doesn't
        # always propagate this for pure-C targets.
        if (MSVC AND NK_IS_64BIT_ARM_)
            target_compile_definitions(nk_shared PRIVATE _ARM64_)
        endif ()

        # Mirror the shipped Release codegen.
        if (NK_IPO_SUPPORTED_)
            set_target_properties(nk_shared PROPERTIES INTERPROCEDURAL_OPTIMIZATION_RELEASE TRUE)
        endif ()

        # NK_TARGET_* defines — driven by ISA compiler probes.
        # Probes test compiler capability (can emit instructions); runtime dispatch
        # via nk_capabilities() selects the best backend at execution time.
        # Platform-specific overrides applied AFTER probes for OS/runtime constraints.

        # Apply compile-only probe results for each architecture
        if (nk_x86_compile_defs_)
            target_compile_definitions(nk_shared PRIVATE ${nk_x86_compile_defs_})
        endif ()
        if (nk_arm_compile_defs_)
            target_compile_definitions(nk_shared PRIVATE ${nk_arm_compile_defs_})
        endif ()
        if (nk_riscv_compile_defs_)
            target_compile_definitions(nk_shared PRIVATE ${nk_riscv_compile_defs_})
        endif ()
        if (nk_loongarch_compile_defs_)
            target_compile_definitions(nk_shared PRIVATE ${nk_loongarch_compile_defs_})
        endif ()
        if (nk_power_compile_defs_)
            target_compile_definitions(nk_shared PRIVATE ${nk_power_compile_defs_})
        endif ()

        # Platform-specific overrides are no longer needed here — the probe .c
        # files contain `#error` guards that cause check_source_compiles() to
        # fail on unsupported OS/runtime combinations.
    endif ()

    install(
        TARGETS nk_shared
        ARCHIVE
        BUNDLE
        FRAMEWORK
        LIBRARY
        OBJECTS
        PRIVATE_HEADER
        PUBLIC_HEADER
        RESOURCE
        RUNTIME
    )
endif ()

# Shared-library test (tests dynamic dispatch path)
if (NK_BUILD_SHARED_TEST)
    if (NOT NK_BUILD_SHARED)
        message(FATAL_ERROR "NK_BUILD_SHARED_TEST requires NK_BUILD_SHARED=ON")
    endif ()

    add_executable(
        nk_shared_test
        test/test.cpp test/test_dot.cpp test/test_spatial.cpp test/test_set.cpp test/test_curved.cpp
        test/test_probability.cpp test/test_each.cpp test/test_trigonometry.cpp test/test_geospatial.cpp
        test/test_mesh.cpp test/test_cast.cpp test/test_reduce.cpp test/test_sparse.cpp test/test_cross_serial.cpp
        test/test_cross_x86.cpp test/test_cross_amx.cpp test/test_cross_arm.cpp test/test_cross_sme.cpp
        test/test_cross_blas.cpp test/test_cross_rvv.cpp test/test_cross_power.cpp test/test_cross_loongarch.cpp
        test/test_cross_wasm.cpp test/test_maxsim.cpp test/test_tensor.cpp
    )
    target_include_directories(nk_shared_test PRIVATE "${PROJECT_SOURCE_DIR}/include")
    target_compile_definitions(nk_shared_test PRIVATE NK_DYNAMIC_DISPATCH=1)
    target_link_libraries(nk_shared_test nk_shared ${NK_CXX_MATH_LIB_})

    # Mirror the shipped Release codegen.
    if (NK_IPO_SUPPORTED_)
        set_target_properties(nk_shared_test PROPERTIES INTERPROCEDURAL_OPTIMIZATION_RELEASE TRUE)
    endif ()

    # The shared-library test must exercise only the DLL dispatch path, so compile
    # the test binary at the platform baseline (no SIMD extensions).  This prevents
    # types.h auto-detection (e.g. MSVC _MSC_VER >= 1920 → NK_TARGET_SKYLAKE=1) from
    # pulling in inline AVX-512 code the CPU may not support.  All ISA-specific
    # kernel coverage comes from nk_test (header-only, with native probe defs).
    target_compile_definitions(
        nk_shared_test
        PRIVATE NK_TARGET_HASWELL=0 NK_TARGET_SKYLAKE=0 NK_TARGET_ICELAKE=0 NK_TARGET_GENOA=0 NK_TARGET_SAPPHIRE=0
                NK_TARGET_SAPPHIREAMX=0 NK_TARGET_GRANITEAMX=0 NK_TARGET_DIAMOND=0 NK_TARGET_TURIN=0 NK_TARGET_ALDER=0
                NK_TARGET_SIERRA=0 NK_TARGET_NEON=0 NK_TARGET_NEONHALF=0 NK_TARGET_NEONSDOT=0 NK_TARGET_NEONBFDOT=0
                NK_TARGET_NEONFHM=0 NK_TARGET_NEONFP8=0 NK_TARGET_SVE=0 NK_TARGET_SVEHALF=0 NK_TARGET_SVEBFDOT=0
                NK_TARGET_SVESDOT=0 NK_TARGET_SVE2=0 NK_TARGET_SVE2P1=0 NK_TARGET_SME=0 NK_TARGET_SME2=0
                NK_TARGET_SME2P1=0 NK_TARGET_SMEF64=0 NK_TARGET_SMEHALF=0 NK_TARGET_SMEBF16=0 NK_TARGET_SMEBI32=0
                NK_TARGET_SMELUT2=0 NK_TARGET_SMEFA64=0 NK_TARGET_RVV=0 NK_TARGET_RVVHALF=0 NK_TARGET_RVVBF16=0
                NK_TARGET_RVVBB=0 NK_TARGET_LOONGSONASX=0 NK_TARGET_POWERVSX=0 NK_TARGET_V128RELAXED=0
    )

    add_test(NAME nk_shared_test COMMAND nk_shared_test)
endif ()

# CUDA interop test built from test/test.cu; see that file's docstring for what it covers and the GPU
# compatibility notes.
if (NK_BUILD_CUDA_TEST)
    enable_language(CUDA)
    if (NOT DEFINED CMAKE_CUDA_ARCHITECTURES)
        set(CMAKE_CUDA_ARCHITECTURES 75)
    endif ()
    add_executable(nk_cuda_test test/test.cu)
    target_include_directories(nk_cuda_test PRIVATE "${PROJECT_SOURCE_DIR}/include")
    set_target_properties(nk_cuda_test PROPERTIES CUDA_STANDARD 20 CUDA_STANDARD_REQUIRED YES CUDA_EXTENSIONS NO)

    # Forward the baseline flags to NVCC's host compiler, scoped to this target.
    if (NK_IS_64BIT_X86_)
        target_compile_options(
            nk_cuda_test PRIVATE -Xcompiler=-march=x86-64 -Xcompiler=-fno-tree-vectorize
                                 -Xcompiler=-fno-tree-slp-vectorize
        )
    elseif (NK_IS_64BIT_ARM_)
        target_compile_options(
            nk_cuda_test PRIVATE -Xcompiler=-march=armv8-a -Xcompiler=-fno-tree-vectorize
                                 -Xcompiler=-fno-tree-slp-vectorize
        )
    endif ()
    if (nk_x86_native_defs_)
        target_compile_definitions(nk_cuda_test PRIVATE ${nk_x86_native_defs_})
    endif ()
    if (nk_arm_native_defs_)
        target_compile_definitions(nk_cuda_test PRIVATE ${nk_arm_native_defs_})
    endif ()
    if (nk_riscv_native_defs_)
        target_compile_definitions(nk_cuda_test PRIVATE ${nk_riscv_native_defs_})
    endif ()
    if (nk_loongarch_native_defs_)
        target_compile_definitions(nk_cuda_test PRIVATE ${nk_loongarch_native_defs_})
    endif ()
    if (nk_power_native_defs_)
        target_compile_definitions(nk_cuda_test PRIVATE ${nk_power_native_defs_})
    endif ()
    add_test(NAME nk_cuda_test COMMAND nk_cuda_test)
endif ()

install(DIRECTORY include/ DESTINATION include)
install(DIRECTORY c/ DESTINATION share/doc/${PROJECT_NAME}/src)