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Allow cmake to use pybind11 from target. #227

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Merged
mansnils merged 2 commits into from
Jun 25, 2026
Merged

Allow cmake to use pybind11 from target. #227

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8b9c53f
Allow cmake to use pybind11 from target.
Erik-Lundell Jun 23, 2026
0f768d3
Lint CMakeLists.txt
Erik-Lundell Jun 24, 2026
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92 changes: 48 additions & 44 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,9 @@
#

cmake_minimum_required(VERSION 3.15.6)
set(CMSIS_OPTIMIZATION_LEVEL "-Ofast" CACHE STRING "Compiler optimization level.")
set(CMSIS_OPTIMIZATION_LEVEL
"-Ofast"
CACHE STRING "Compiler optimization level.")
option(ARM_NN_ENABLE_F32 "Enable CMSIS-NN float32 extensions." OFF)
option(ARM_NN_ENABLE_F16 "Enable CMSIS-NN float16 extensions." OFF)

Expand All @@ -26,83 +28,85 @@ project(CMSISNN C CXX)
add_library(cmsis-nn STATIC)

if(ARM_NN_ENABLE_F32)
set(ARM_NN_ENABLE_F32_VALUE 1)
set(ARM_NN_ENABLE_F32_VALUE 1)
else()
set(ARM_NN_ENABLE_F32_VALUE 0)
set(ARM_NN_ENABLE_F32_VALUE 0)
endif()

if(ARM_NN_ENABLE_F16)
set(ARM_NN_ENABLE_F16_VALUE 1)
set(ARM_NN_ENABLE_F16_VALUE 1)
else()
set(ARM_NN_ENABLE_F16_VALUE 0)
set(ARM_NN_ENABLE_F16_VALUE 0)
endif()

target_compile_options(cmsis-nn PRIVATE ${CMSIS_OPTIMIZATION_LEVEL})
target_compile_definitions(cmsis-nn
PUBLIC ARM_NN_ENABLE_F32=${ARM_NN_ENABLE_F32_VALUE}
ARM_NN_ENABLE_F16=${ARM_NN_ENABLE_F16_VALUE})
target_compile_definitions(
cmsis-nn PUBLIC ARM_NN_ENABLE_F32=${ARM_NN_ENABLE_F32_VALUE}
ARM_NN_ENABLE_F16=${ARM_NN_ENABLE_F16_VALUE})

target_include_directories(cmsis-nn PUBLIC "Include")

add_subdirectory(Source)

option(CMSISNN_BUILD_PYBIND "Build pybind11 Python module for CMSIS-NN helpers" OFF)
option(CMSISNN_BUILD_PYBIND "Build pybind11 Python module for CMSIS-NN helpers"
OFF)

if(CMSISNN_BUILD_PYBIND)

# Add shared library for testing bindings with ctest
add_library(cmsis-nn-shared SHARED
$<TARGET_PROPERTY:cmsis-nn,SOURCES>
)
add_library(cmsis-nn-shared SHARED $<TARGET_PROPERTY:cmsis-nn,SOURCES>)
set_target_properties(cmsis-nn-shared PROPERTIES OUTPUT_NAME cmsis-nn)
target_include_directories(cmsis-nn-shared PRIVATE
$<TARGET_PROPERTY:cmsis-nn,INCLUDE_DIRECTORIES>
)
target_include_directories(
cmsis-nn-shared PRIVATE $<TARGET_PROPERTY:cmsis-nn,INCLUDE_DIRECTORIES>)
target_compile_options(cmsis-nn-shared PRIVATE ${CMSIS_OPTIMIZATION_LEVEL})

set(Python3_FIND_VIRTUALENV FIRST)
find_package(Python3 COMPONENTS Interpreter Development REQUIRED)

execute_process(
COMMAND ${Python3_EXECUTABLE} -m pybind11 --cmakedir
OUTPUT_VARIABLE pybind11_PYTHON_CMAKE_DIR
OUTPUT_STRIP_TRAILING_WHITESPACE
)

find_package(pybind11 CONFIG
HINTS "${pybind11_PYTHON_CMAKE_DIR}"
)
if(NOT pybind11_FOUND)
message(FATAL_ERROR "pybind11 not found. Install pybind11, set pybind11_DIR, or set CMSISNN_BUILD_PYBIND=OFF.")
if(NOT TARGET pybind11::module)
# pybind11 was not provided as a target, try to find installed package.

set(Python3_FIND_VIRTUALENV FIRST)
find_package(
Python3
COMPONENTS Interpreter Development
REQUIRED)

execute_process(
COMMAND ${Python3_EXECUTABLE} -m pybind11 --cmakedir
OUTPUT_VARIABLE pybind11_PYTHON_CMAKE_DIR
OUTPUT_STRIP_TRAILING_WHITESPACE)

find_package(pybind11 CONFIG HINTS "${pybind11_PYTHON_CMAKE_DIR}")
if(NOT pybind11_FOUND)
message(
FATAL_ERROR
"pybind11 not found. Install pybind11, set pybind11_DIR, or set CMSISNN_BUILD_PYBIND=OFF."
)
endif()
endif()

pybind11_add_module(cmsis_nn MODULE
pybind11_add_module(
cmsis_nn
MODULE
Source/Bindings/arm_py_module.cpp
Source/Bindings/arm_py_backend.cpp
Source/Bindings/arm_py_avgpool_buffer_size.cpp
Source/Bindings/arm_py_conv_buffer_size.cpp
Source/Bindings/arm_py_depthwise_conv_buffer_size.cpp
Source/Bindings/arm_py_fully_connected_buffer_size.cpp
Source/Bindings/arm_py_svdf_buffer_size.cpp
Source/Bindings/arm_py_transpose_conv_buffer_size.cpp
)
Source/Bindings/arm_py_transpose_conv_buffer_size.cpp)
set_target_properties(cmsis_nn PROPERTIES PREFIX "")
target_include_directories(cmsis_nn PRIVATE
${Python3_INCLUDE_DIRS}
${CMAKE_CURRENT_SOURCE_DIR}/Include
)
target_include_directories(
cmsis_nn PRIVATE ${Python3_INCLUDE_DIRS}
${CMAKE_CURRENT_SOURCE_DIR}/Include)

target_link_libraries(cmsis_nn PRIVATE
cmsis-nn
pybind11::headers
)
target_link_libraries(cmsis_nn PRIVATE cmsis-nn pybind11::headers)

target_compile_options(cmsis_nn PRIVATE ${CMSIS_OPTIMIZATION_LEVEL})

# Put the built .so into the python package directory inside the wheel
install(TARGETS cmsis_nn
LIBRARY DESTINATION cmsis_nn
RUNTIME DESTINATION cmsis_nn
)
install(
TARGETS cmsis_nn
LIBRARY DESTINATION cmsis_nn
RUNTIME DESTINATION cmsis_nn)

endif()
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