How compile opencv for C66x DSP core?

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1

I am trying to compile opencv for the TI’s AM273x SoC that has a DSP C66x core on it. Where exactly should I start and what files must be modified?

I am getting configuration errors while trying to use Cmake and compile it. It’d be great if someone can give me a starting point on what and where should be followed? Here are some more details about the tool chain.

Compiler- TI Armclang llvm compiler - ti-cgt-armllvm_2.1.1.LTS
SoC - AM273x (Has 2 Cortex-R5 cores, One DSP C66x Core)
RAM - 3.25Mb DSP RAM and 2MB ram for R5 cores

Any help would be appreciated.

Thanks,
G Kowshik

2

just curious, what exactly do you want to do later with opencv there ?

3

I am trying to make a simple demo like face detection or image manipulation kind of functions with my DSP core.

4

i’m definitely no expert on this, but:

afaik, no support from current opencv code for that

i also doubt, that you can squeeze even a most minimal opencv prog + data into 3.5 mb ram …

IF you want to try nonetheless, maybe have a look at similar efforts like this:

5

Hi,

Thanks for the pointer. If current opencv doesn’t support C66x, I atleast want to compile it for Cortex-R5F.

And also when you say “Current opencv doesn’t support it” what does it mean? Are you referring to the intrinsic instructions opencv uses?

6

i simply haven’t seen any mentioning of those chips / architectures anywhere

7

Hi,

No problem. However, I always had this doubt of how to cross compile stuff like opencv to any controllers. I want to atleast make the library out of the source.

I’ve recently seen NXP’s appnote on how to run opencv on RT1170 M7 microcontroller,

How was this actually possible? I have downloaded their source code and tried understanding the process. I was able to figure out the following

  1. Compiler tool chain paths

  2. Compiler parameters like -mcpu, -fpu, etc., Etc.,

However I’m having a hard time getting it compiled. So I wanna understand from community what steps a person should take before starting to compile opencv for a specific microcontroller or microprocessor platform?

Thanks alot for your patience.

1 Like
8

those iMXRT processors are powerful beasts. I don’t know if they can run linux but they have enough power for some DSP applications.

that PDF you linked suggests the process to be fairly painless. it’s “just” crosscompilation.

the same steps should be possible for your Cortex R controllers. they’re more powerful than Cortex M, afaik.

Since you have a Cortex R with DSP, you’ll have to figure out whether your compiler (toolchain) can compile and optimize code to use that DSP part of the chip, or if you need to use some kind of intrinsics to hand-optimize specific code.

OpenCV does support some ARM targets. There is ARM NEON optimization in some places in OpenCV. if you look around, you might find other people interested in what you’re doing, and potentially helping.

9

Hi All,

Quick follow up question. What if a user decides not to use the CMAKE tool to compile open-cv, what other alternatives are present for them to compile it from source, basically if I have a compiler, what files from the opencv repo should I take so that my source compiles correctly.

The reason I ask is, when I was going through the CMAKE, I see that there are some template files present which are generated during the configure and generation process of cmake. However, if I wish to not use this method and take the source as such and compile what should I do?

P.S. Compiler I am going to use is arm-none-eabi-gcc given by ARM itself for cross-compiling to Armv7-R architectures.

Thanks,
G Kowshik

10

https://cmake.org/

CMake does not build anything.

CMake generates build files or your choice (Makefile, Ninja, Visual Studio Solution, …)

those control the build process.

if you refuse to use CMake , you’re on your own. there is no support for doing it differently.

there is no reason to refuse. CMake is supposed to see the cross-compilation toolchain for your target, that you install on your host system, and CMake will generate appropriate build files for that toolchain.

Just look at the instructions in that PDF. they cross-compile too. equivalent steps will work on Linux.

11

Hi @crackwitz

I took your suggestion of using the CMAKE only for compiling the opencv. I started tweaking around and somehow able to get the configuring part done properly with the below toolchain CMAKE file.

set(CMAKE_SYSTEM_NAME               Generic)
set(CMAKE_SYSTEM_PROCESSOR          arm)
set(BAREMETAL_ARM_TOOLCHAIN_PATH    /home/kowshik/Documents/gcc/gcc-arm-none-eabi-10.3-2021.10/bin/)
# Without that flag CMake is not able to pass test compilation check
set(CMAKE_TRY_COMPILE_TARGET_TYPE   STATIC_LIBRARY)

set(CMAKE_AR                        ${BAREMETAL_ARM_TOOLCHAIN_PATH}arm-none-eabi-ar${CMAKE_EXECUTABLE_SUFFIX})
set(CMAKE_ASM_COMPILER              ${BAREMETAL_ARM_TOOLCHAIN_PATH}arm-none-eabi-gcc${CMAKE_EXECUTABLE_SUFFIX})
set(CMAKE_C_COMPILER                ${BAREMETAL_ARM_TOOLCHAIN_PATH}arm-none-eabi-gcc${CMAKE_EXECUTABLE_SUFFIX})
set(CMAKE_CXX_COMPILER              ${BAREMETAL_ARM_TOOLCHAIN_PATH}arm-none-eabi-g++${CMAKE_EXECUTABLE_SUFFIX})
set(CMAKE_LINKER                    ${BAREMETAL_ARM_TOOLCHAIN_PATH}arm-none-eabi-ld${CMAKE_EXECUTABLE_SUFFIX})
set(CMAKE_OBJCOPY                   ${BAREMETAL_ARM_TOOLCHAIN_PATH}arm-none-eabi-objcopy${CMAKE_EXECUTABLE_SUFFIX} CACHE INTERNAL "")
set(CMAKE_RANLIB                    ${BAREMETAL_ARM_TOOLCHAIN_PATH}arm-none-eabi-ranlib${CMAKE_EXECUTABLE_SUFFIX} CACHE INTERNAL "")
set(CMAKE_SIZE                      ${BAREMETAL_ARM_TOOLCHAIN_PATH}arm-none-eabi-size${CMAKE_EXECUTABLE_SUFFIX} CACHE INTERNAL "")
set(CMAKE_STRIP                     ${BAREMETAL_ARM_TOOLCHAIN_PATH}arm-none-eabi-strip${CMAKE_EXECUTABLE_SUFFIX} CACHE INTERNAL "")

set(CMAKE_C_FLAGS                   "-mcpu=cortex-r5 -mthumb -mfloat-abi=hard -mfpu=vfpv3-d16 -fPIC -Wno-psabi -Wno-dev --specs=nosys.specs -fdata-sections -ffunction-sections -Wl,--gc-sections" CACHE INTERNAL "")
set(CMAKE_CXX_FLAGS                 "${CMAKE_C_FLAGS} -fno-exceptions" CACHE INTERNAL "")

set(CMAKE_C_FLAGS_DEBUG             "-Os -g" CACHE INTERNAL "")
set(CMAKE_C_FLAGS_RELEASE           "-Os -DNDEBUG" CACHE INTERNAL "")
set(CMAKE_CXX_FLAGS_DEBUG           "${CMAKE_C_FLAGS_DEBUG}" CACHE INTERNAL "")
set(CMAKE_CXX_FLAGS_RELEASE         "${CMAKE_C_FLAGS_RELEASE}" CACHE INTERNAL "")

set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

However, it seems my Generation is not done properly, it complains something about zlib, ittnotify etc., I checked with chatGPT on what these errors are and it says to install few libraries which still didn’t solve the issues and I am getting these errors while generating.
Can you please help what are these errors might be about?

Adding the entire cmake-gui LOG below, please let me know if you need any more info (Added the logs as 2 seperate replies due to character count limit).

Thanks

12 
'Release' build type is used by default. Use CMAKE_BUILD_TYPE to specify build type (Release or Debug)
The CXX compiler identification is GNU 10.3.1
The C compiler identification is GNU 10.3.1
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Check for working CXX compiler: /home/kowshik/Documents/gcc/gcc-arm-none-eabi-10.3-2021.10/bin/arm-none-eabi-g++ - skipped
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Check for working C compiler: /home/kowshik/Documents/gcc/gcc-arm-none-eabi-10.3-2021.10/bin/arm-none-eabi-gcc - skipped
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OpenCV: system-specific configuration file is not found: 'Generic'
Detected processor: arm
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Cannot probe for Python/Numpy support (because we are cross-compiling OpenCV)
If you want to enable Python/Numpy support, set the following variables:
PYTHON2_INCLUDE_PATH
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PYTHON2_NUMPY_INCLUDE_DIRS
PYTHON3_INCLUDE_PATH
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PYTHON3_NUMPY_INCLUDE_DIRS
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Cannot probe for Python/Numpy support (because we are cross-compiling OpenCV)
If you want to enable Python/Numpy support, set the following variables:
PYTHON2_INCLUDE_PATH
PYTHON2_LIBRARIES (optional on Unix-like systems)
PYTHON2_NUMPY_INCLUDE_DIRS
PYTHON3_INCLUDE_PATH
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Performing Test HAVE_CXX_WNO_INVALID_OFFSETOF
Performing Test HAVE_CXX_WNO_INVALID_OFFSETOF - Success
Performing Test HAVE_CXX_WNO_ENUM_COMPARE_SWITCH
Performing Test HAVE_CXX_WNO_ENUM_COMPARE_SWITCH - Success
Performing Test HAVE_CXX_WNO_SUGGEST_OVERRIDE
Performing Test HAVE_CXX_WNO_SUGGEST_OVERRIDE - Success
Performing Test HAVE_CXX_WNO_INCONSISTENT_MISSING_OVERRIDE
Performing Test HAVE_CXX_WNO_INCONSISTENT_MISSING_OVERRIDE - Success
Performing Test HAVE_CXX_WNO_IMPLICIT_FALLTHROUGH
Performing Test HAVE_CXX_WNO_IMPLICIT_FALLTHROUGH - Success
Performing Test HAVE_CXX_WNO_ARRAY_BOUNDS
Performing Test HAVE_CXX_WNO_ARRAY_BOUNDS - Success
Performing Test HAVE_CXX_WNO_CLASS_MEMACCESS
Performing Test HAVE_CXX_WNO_CLASS_MEMACCESS - Success
Carotene: NEON is not available, disabling carotene...
Looking for dlerror in dl
Looking for dlerror in dl - found
ADE: Downloading v0.1.2a.zip from https://github.com/opencv/ade/archive/v0.1.2a.zip
Allocator metrics storage type: 'int'
CMake Warning (dev) at cmake/OpenCVUtils.cmake:1560 (add_library):
 ADD_LIBRARY called with SHARED option but the target platform does not
 support dynamic linking. Building a STATIC library instead. This may lead
 to problems.
Call Stack (most recent call first):
 cmake/OpenCVModule.cmake:989 (ocv_add_library)
 cmake/OpenCVModule.cmake:905 (_ocv_create_module)
 modules/core/CMakeLists.txt:144 (ocv_create_module)
This warning is for project developers. Use -Wno-dev to suppress it.
Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.sse2.cpp
Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.sse3.cpp
Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.ssse3.cpp
Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.sse4_1.cpp
Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.sse4_2.cpp
Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.avx.cpp
Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.fp16.cpp
Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.avx2.cpp
Excluding from source files list: <BUILD>/modules/core/test/test_intrin128.avx512_skx.cpp
Excluding from source files list: <BUILD>/modules/core/test/test_intrin256.avx2.cpp
Excluding from source files list: <BUILD>/modules/core/test/test_intrin256.avx512_skx.cpp
Excluding from source files list: <BUILD>/modules/core/test/test_intrin512.avx512_skx.cpp
CMake Warning (dev) at cmake/OpenCVUtils.cmake:1560 (add_library):
 ADD_LIBRARY called with SHARED option but the target platform does not
 support dynamic linking. Building a STATIC library instead. This may lead
 to problems.
Call Stack (most recent call first):
 cmake/OpenCVModule.cmake:989 (ocv_add_library)
 cmake/OpenCVModule.cmake:905 (_ocv_create_module)
 cmake/OpenCVModule.cmake:1131 (ocv_create_module)
 modules/flann/CMakeLists.txt:2 (ocv_define_module)
This warning is for project developers. Use -Wno-dev to suppress it.
Excluding from source files list: modules/imgproc/src/corner.avx.cpp
Excluding from source files list: modules/imgproc/src/imgwarp.avx2.cpp
Excluding from source files list: modules/imgproc/src/imgwarp.lasx.cpp
Excluding from source files list: modules/imgproc/src/imgwarp.sse4_1.cpp
Excluding from source files list: modules/imgproc/src/resize.avx2.cpp
Excluding from source files list: modules/imgproc/src/resize.lasx.cpp
Excluding from source files list: modules/imgproc/src/resize.sse4_1.cpp
CMake Warning (dev) at cmake/OpenCVUtils.cmake:1560 (add_library):
 ADD_LIBRARY called with SHARED option but the target platform does not
 support dynamic linking. Building a STATIC library instead. This may lead
 to problems.
Call Stack (most recent call first):
 cmake/OpenCVModule.cmake:989 (ocv_add_library)
 cmake/OpenCVModule.cmake:905 (_ocv_create_module)
 cmake/OpenCVModule.cmake:1131 (ocv_create_module)
 modules/imgproc/CMakeLists.txt:13 (ocv_define_module)
This warning is for project developers. Use -Wno-dev to suppress it.
CMake Warning (dev) at cmake/OpenCVUtils.cmake:1560 (add_library):
 ADD_LIBRARY called with SHARED option but the target platform does not
 support dynamic linking. Building a STATIC library instead. This may lead
 to problems.
Call Stack (most recent call first):
 cmake/OpenCVModule.cmake:989 (ocv_add_library)
 cmake/OpenCVModule.cmake:905 (_ocv_create_module)
 cmake/OpenCVModule.cmake:1131 (ocv_create_module)
 modules/ml/CMakeLists.txt:2 (ocv_define_module)
This warning is for project developers. Use -Wno-dev to suppress it.
CMake Warning (dev) at cmake/OpenCVUtils.cmake:1560 (add_library):
 ADD_LIBRARY called with SHARED option but the target platform does not
 support dynamic linking. Building a STATIC library instead. This may lead
 to problems.
Call Stack (most recent call first):
 cmake/OpenCVModule.cmake:989 (ocv_add_library)
 cmake/OpenCVModule.cmake:905 (_ocv_create_module)
 cmake/OpenCVModule.cmake:1131 (ocv_create_module)
 modules/photo/CMakeLists.txt:7 (ocv_define_module)
This warning is for project developers. Use -Wno-dev to suppress it.
Registering hook 'INIT_MODULE_SOURCES_opencv_dnn': /home/kowshik/Desktop/opencv_porting/opencv/modules/dnn/cmake/hooks/INIT_MODULE_SOURCES_opencv_dnn.cmake
opencv_dnn: filter out cuda4dnn source code
Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx.cpp
Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx2.cpp
Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx512_skx.cpp
Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.rvv.cpp
Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.lasx.cpp
Excluding from source files list: <BUILD>/modules/dnn/int8layers/layers_common.avx2.cpp
Excluding from source files list: <BUILD>/modules/dnn/int8layers/layers_common.avx512_skx.cpp
Excluding from source files list: <BUILD>/modules/dnn/int8layers/layers_common.lasx.cpp
Excluding from source files list: <BUILD>/modules/dnn/layers/cpu_kernels/conv_block.avx.cpp
Excluding from source files list: <BUILD>/modules/dnn/layers/cpu_kernels/conv_block.avx2.cpp
Excluding from source files list: <BUILD>/modules/dnn/layers/cpu_kernels/conv_depthwise.avx.cpp
Excluding from source files list: <BUILD>/modules/dnn/layers/cpu_kernels/conv_depthwise.avx2.cpp
Excluding from source files list: <BUILD>/modules/dnn/layers/cpu_kernels/conv_depthwise.rvv.cpp
Excluding from source files list: <BUILD>/modules/dnn/layers/cpu_kernels/conv_depthwise.lasx.cpp
Excluding from source files list: <BUILD>/modules/dnn/layers/cpu_kernels/conv_winograd_f63.avx.cpp
Excluding from source files list: <BUILD>/modules/dnn/layers/cpu_kernels/conv_winograd_f63.avx2.cpp
CMake Warning (dev) at cmake/OpenCVUtils.cmake:1560 (add_library):
 ADD_LIBRARY called with SHARED option but the target platform does not
 support dynamic linking. Building a STATIC library instead. This may lead
 to problems.
Call Stack (most recent call first):
 cmake/OpenCVModule.cmake:989 (ocv_add_library)
 cmake/OpenCVModule.cmake:905 (_ocv_create_module)
 modules/dnn/CMakeLists.txt:246 (ocv_create_module)
This warning is for project developers. Use -Wno-dev to suppress it.
Excluding from source files list: modules/features2d/src/fast.avx2.cpp
CMake Warning (dev) at cmake/OpenCVUtils.cmake:1560 (add_library):
 ADD_LIBRARY called with SHARED option but the target platform does not
 support dynamic linking. Building a STATIC library instead. This may lead
 to problems.
Call Stack (most recent call first):
 cmake/OpenCVModule.cmake:989 (ocv_add_library)
 cmake/OpenCVModule.cmake:905 (_ocv_create_module)
 cmake/OpenCVModule.cmake:1131 (ocv_create_module)
 modules/features2d/CMakeLists.txt:9 (ocv_define_module)
This warning is for project developers. Use -Wno-dev to suppress it.
CMake Warning (dev) at cmake/OpenCVUtils.cmake:1560 (add_library):
 ADD_LIBRARY called with SHARED option but the target platform does not
 support dynamic linking. Building a STATIC library instead. This may lead
 to problems.
Call Stack (most recent call first):
 cmake/OpenCVModule.cmake:989 (ocv_add_library)
 cmake/OpenCVModule.cmake:905 (_ocv_create_module)
 modules/imgcodecs/CMakeLists.txt:163 (ocv_create_module)
This warning is for project developers. Use -Wno-dev to suppress it.
Performing Test HAVE_CXX_WNO_DEPRECATED_DECLARATIONS
Performing Test HAVE_CXX_WNO_DEPRECATED_DECLARATIONS - Success
CMake Warning (dev) at cmake/OpenCVUtils.cmake:1560 (add_library):
 ADD_LIBRARY called with SHARED option but the target platform does not
 support dynamic linking. Building a STATIC library instead. This may lead
 to problems.
Call Stack (most recent call first):
 cmake/OpenCVModule.cmake:989 (ocv_add_library)
 cmake/OpenCVModule.cmake:905 (_ocv_create_module)
 modules/videoio/CMakeLists.txt:270 (ocv_create_module)
This warning is for project developers. Use -Wno-dev to suppress it.
CMake Warning (dev) at cmake/OpenCVUtils.cmake:1560 (add_library):
 ADD_LIBRARY called with SHARED option but the target platform does not
 support dynamic linking. Building a STATIC library instead. This may lead
 to problems.
Call Stack (most recent call first):
 cmake/OpenCVModule.cmake:989 (ocv_add_library)
 cmake/OpenCVModule.cmake:905 (_ocv_create_module)
 cmake/OpenCVModule.cmake:1131 (ocv_create_module)
 modules/calib3d/CMakeLists.txt:9 (ocv_define_module)
This warning is for project developers. Use -Wno-dev to suppress it.
highgui: using builtin backend: NONE
CMake Warning (dev) at cmake/OpenCVUtils.cmake:1560 (add_library):
 ADD_LIBRARY called with SHARED option but the target platform does not
 support dynamic linking. Building a STATIC library instead. This may lead
 to problems.
Call Stack (most recent call first):
 cmake/OpenCVModule.cmake:989 (ocv_add_library)
 cmake/OpenCVModule.cmake:905 (_ocv_create_module)
 modules/highgui/CMakeLists.txt:291 (ocv_create_module)
This warning is for project developers. Use -Wno-dev to suppress it.
CMake Warning (dev) at cmake/OpenCVUtils.cmake:1560 (add_library):
 ADD_LIBRARY called with SHARED option but the target platform does not
 support dynamic linking. Building a STATIC library instead. This may lead
 to problems.
Call Stack (most recent call first):
 cmake/OpenCVModule.cmake:989 (ocv_add_library)
 cmake/OpenCVModule.cmake:905 (_ocv_create_module)
 cmake/OpenCVModule.cmake:1131 (ocv_create_module)
 modules/objdetect/CMakeLists.txt:2 (ocv_define_module)
This warning is for project developers. Use -Wno-dev to suppress it.
CMake Warning (dev) at cmake/OpenCVUtils.cmake:1560 (add_library):
 ADD_LIBRARY called with SHARED option but the target platform does not
 support dynamic linking. Building a STATIC library instead. This may lead
 to problems.
Call Stack (most recent call first):
 cmake/OpenCVModule.cmake:989 (ocv_add_library)
 cmake/OpenCVModule.cmake:905 (_ocv_create_module)
 cmake/OpenCVModule.cmake:1131 (ocv_create_module)
 modules/stitching/CMakeLists.txt:11 (ocv_define_module)
This warning is for project developers. Use -Wno-dev to suppress it.
CMake Warning (dev) at cmake/OpenCVUtils.cmake:1560 (add_library):
 ADD_LIBRARY called with SHARED option but the target platform does not
 support dynamic linking. Building a STATIC library instead. This may lead
 to problems.
Call Stack (most recent call first):
 cmake/OpenCVModule.cmake:989 (ocv_add_library)
 cmake/OpenCVModule.cmake:905 (_ocv_create_module)
 cmake/OpenCVModule.cmake:1131 (ocv_create_module)
 modules/video/CMakeLists.txt:2 (ocv_define_module)
This warning is for project developers. Use -Wno-dev to suppress it.
CMake Warning (dev) at cmake/OpenCVUtils.cmake:1560 (add_library):
 ADD_LIBRARY called with SHARED option but the target platform does not
 support dynamic linking. Building a STATIC library instead. This may lead
 to problems.
Call Stack (most recent call first):
 cmake/OpenCVModule.cmake:989 (ocv_add_library)
 cmake/OpenCVModule.cmake:905 (_ocv_create_module)
 modules/gapi/CMakeLists.txt:246 (ocv_create_module)
This warning is for project developers. Use -Wno-dev to suppress it.
Found 'misc' Python modules from /home/kowshik/Desktop/opencv_porting/opencv/modules/python/package/extra_modules
Found 'mat_wrapper;utils' Python modules from /home/kowshik/Desktop/opencv_porting/opencv/modules/core/misc/python/package
Found 'gapi' Python modules from /home/kowshik/Desktop/opencv_porting/opencv/modules/gapi/misc/python/package
General configuration for OpenCV 4.7.0-dev =====================================
Version control: 4.7.0-251-ge3e1f704a4
Platform:
Timestamp: 2023-04-26T19:47:48Z
13 
Host: Linux 5.19.0-21-generic x86_64
Target: Generic arm
CMake: 3.22.1
CMake generator: Unix Makefiles
CMake build tool: /usr/bin/gmake
Configuration: Release
CPU/HW features:
Baseline:
requested: DETECT
disabled: VFPV3 NEON
C/C++:
Built as dynamic libs?: YES
C++ standard: 11
C++ Compiler: /home/kowshik/Documents/gcc/gcc-arm-none-eabi-10.3-2021.10/bin/arm-none-eabi-g++ (ver 10.3.1)
C++ flags (Release): -mcpu=cortex-r5 -mthumb -mfloat-abi=hard -mfpu=vfpv3-d16 -fPIC -w -Wno-psabi -Wno-dev --specs=nosys.specs -fdata-sections -ffunction-sections -Wl,--gc-sections -fno-exceptions -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wno-psabi -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -Os -DNDEBUG -DNDEBUG
C++ flags (Debug): -mcpu=cortex-r5 -mthumb -mfloat-abi=hard -mfpu=vfpv3-d16 -fPIC -w -Wno-psabi -Wno-dev --specs=nosys.specs -fdata-sections -ffunction-sections -Wl,--gc-sections -fno-exceptions -fsigned-char -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wno-psabi -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -Os -g -DDEBUG -D_DEBUG
C Compiler: /home/kowshik/Documents/gcc/gcc-arm-none-eabi-10.3-2021.10/bin/arm-none-eabi-gcc
C flags (Release): -mcpu=cortex-r5 -mthumb -mfloat-abi=hard -mfpu=vfpv3-d16 -fPIC -w -Wno-psabi -Wno-dev --specs=nosys.specs -fdata-sections -ffunction-sections -Wl,--gc-sections -fsigned-char -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-psabi -Wno-unnamed-type-template-args -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -Os -DNDEBUG -DNDEBUG
C flags (Debug): -mcpu=cortex-r5 -mthumb -mfloat-abi=hard -mfpu=vfpv3-d16 -fPIC -w -Wno-psabi -Wno-dev --specs=nosys.specs -fdata-sections -ffunction-sections -Wl,--gc-sections -fsigned-char -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-psabi -Wno-unnamed-type-template-args -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -Os -g -DDEBUG -D_DEBUG
Linker flags (Release): -Wl,--gc-sections
Linker flags (Debug): -Wl,--gc-sections
ccache: NO
Precompiled headers: NO
Extra dependencies:
3rdparty dependencies:
OpenCV modules:
To be built: calib3d core dnn features2d flann gapi highgui imgcodecs imgproc ml objdetect photo stitching ts video videoio
Disabled: world
Disabled by dependency: -
Unavailable: java python2 python3
Applications: tests perf_tests apps
Documentation: NO
Non-free algorithms: NO
GUI: NONE
Media I/O:
ZLib: zlib (ver 1.2.13)
JPEG: libjpeg-turbo (ver 2.1.3-62)
WEBP: build (ver encoder: 0x020f)
PNG: build (ver 1.6.37)
TIFF: build (ver 42 - 4.2.0)
JPEG 2000: build (ver 2.4.0)
HDR: YES
SUNRASTER: YES
PXM: YES
PFM: YES
Video I/O:
DC1394: NO
FFMPEG: NO
avcodec: NO
avformat: NO
avutil: NO
swscale: NO
avresample: NO
GStreamer: NO
Parallel framework: none
Trace: YES (with Intel ITT)
Other third-party libraries:
Lapack: NO
Custom HAL: NO
Protobuf: build (3.19.1)
Flatbuffers: builtin/3rdparty (23.1.21)
OpenCL: YES (no extra features)
Include path: /home/kowshik/Desktop/opencv_porting/opencv/3rdparty/include/opencl/1.2
Link libraries: Dynamic load
Python (for build): /usr/bin/python2.7
Install to: /home/kowshik/Desktop/opencv_porting/opencv/build/install
-----------------------------------------------------------------
Configuring done
CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_core" which requires target "zlib" that is not in any export set.
CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_core" which requires target "ittnotify" that is not in any export set.
CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_dnn" which requires target "ocv.3rdparty.flatbuffers" that is not in any export set.
CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_dnn" which requires target "libprotobuf" that is not in any export set.
CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_imgcodecs" which requires target "libjpeg-turbo" that is not in any export set.
CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_imgcodecs" which requires target "libwebp" that is not in any export set.
CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_imgcodecs" which requires target "libpng" that is not in any export set.
CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_imgcodecs" which requires target "libtiff" that is not in any export set.
CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_imgcodecs" which requires target "libopenjp2" that is not in any export set.
CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_imgcodecs" which requires target "zlib" that is not in any export set.
CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_objdetect" which requires target "quirc" that is not in any export set.
CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_gapi" which requires target "ade" that is not in any export set.
CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_gapi" which requires target "ittnotify" that is not in any export set.
CMake Error in CMakeLists.txt:
 export called with target "opencv_core" which requires target "zlib" that
 is not in any export set.


CMake Error in CMakeLists.txt:
 export called with target "opencv_core" which requires target "ittnotify"
 that is not in any export set.


CMake Error in CMakeLists.txt:
 export called with target "opencv_dnn" which requires target
 "ocv.3rdparty.flatbuffers" that is not in any export set.


CMake Error in CMakeLists.txt:
 export called with target "opencv_dnn" which requires target "libprotobuf"
 that is not in any export set.


CMake Error in CMakeLists.txt:
 export called with target "opencv_imgcodecs" which requires target
 "libjpeg-turbo" that is not in any export set.


CMake Error in CMakeLists.txt:
 export called with target "opencv_imgcodecs" which requires target
 "libwebp" that is not in any export set.


CMake Error in CMakeLists.txt:
 export called with target "opencv_imgcodecs" which requires target "libpng"
 that is not in any export set.


CMake Error in CMakeLists.txt:
 export called with target "opencv_imgcodecs" which requires target
 "libtiff" that is not in any export set.


CMake Error in CMakeLists.txt:
 export called with target "opencv_imgcodecs" which requires target
 "libopenjp2" that is not in any export set.


CMake Error in CMakeLists.txt:
 export called with target "opencv_imgcodecs" which requires target "zlib"
 that is not in any export set.


CMake Error in CMakeLists.txt:
 export called with target "opencv_objdetect" which requires target "quirc"
 that is not in any export set.


CMake Error in CMakeLists.txt:
 export called with target "opencv_gapi" which requires target "ade" that is
 not in any export set.


CMake Error in CMakeLists.txt:
 export called with target "opencv_gapi" which requires target "ittnotify"
 that is not in any export set.


Generating done
14

  • for a start, do yourself a favour, and reduce this to the bare minimum for now
    (highgui, on an mcu ?) avoid the imgcodecs, videoio modules with huge dependencies

    cmake -DBUILD_LIST=“core,calib3d,flann,imgproc”

  • can we see your cmake cmdline ?
    (i see a lot of setcommands, where do those go ?)

  • i have NO idea, how cmake finds 3rd party libs for cross-compilation
    (guess: a minefield) , look if there is src code in the 3rdparty folder, &when in doubt, try to use that., like:

    cmake -DBUILD_ZLIB=ON

15

Hi Berak,

Thanks for the reply, I have change the BUILD_LIST to minimal and yes it makes sense because of the low memory and RAM I might be having, thanks for pointing this out. I re-configured my build and now it shows only 4 libs as you suggested

OpenCV modules:
    To be built:                 core flann imgproc photo
    Disabled:                    dnn features2d gapi highgui imgcodecs java_bindings_generator js_bindings_generator ml objc_bindings_generator python_tests stitching ts video videoio world
    Disabled by dependency:      calib3d objdetect
    Unavailable:                 java python2 python3
    Applications:                apps
    Documentation:               NO
    Non-free algorithms:         NO

Can I know how to get the command run? I am using cmake-gui version and I am not able to see any command being printed, any variable or file I should refer to get the entire command please?

Yes, once I click Generate the step fails but it creates some make files in the 3rdparty folder as shown

image

Thanks

16

it’s all saved into build/CmakeCache.txt (if you need to look something up)

we probably need to see your current output

17

I think I found the compiler flags and commands, see if this is correct?

C++ Compiler: /home/kowshik/Documents/gcc/gcc-arm-none-eabi-10.3-2021.10/bin/arm-none-eabi-g++ (ver 10.3.1)
C++ flags (Release): -mcpu=cortex-r5 -mthumb -mfloat-abi=hard -mfpu=vfpv3-d16 -fPIC -Wno-psabi -Wno-dev --specs=nosys.specs -fdata-sections -ffunction-sections -Wl,--gc-sections -fno-exceptions -fsigned-char -W -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wno-psabi -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -Os -DNDEBUG -DNDEBUG
C++ flags (Debug): -mcpu=cortex-r5 -mthumb -mfloat-abi=hard -mfpu=vfpv3-d16 -fPIC -Wno-psabi -Wno-dev --specs=nosys.specs -fdata-sections -ffunction-sections -Wl,--gc-sections -fno-exceptions -fsigned-char -W -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wno-psabi -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-unnamed-type-template-args -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -Os -g -DDEBUG -D_DEBUG
C Compiler: /home/kowshik/Documents/gcc/gcc-arm-none-eabi-10.3-2021.10/bin/arm-none-eabi-gcc
C flags (Release): -mcpu=cortex-r5 -mthumb -mfloat-abi=hard -mfpu=vfpv3-d16 -fPIC -Wno-psabi -Wno-dev --specs=nosys.specs -fdata-sections -ffunction-sections -Wl,--gc-sections -fsigned-char -W -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-psabi -Wno-unnamed-type-template-args -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -Os -DNDEBUG -DNDEBUG
C flags (Debug): -mcpu=cortex-r5 -mthumb -mfloat-abi=hard -mfpu=vfpv3-d16 -fPIC -Wno-psabi -Wno-dev --specs=nosys.specs -fdata-sections -ffunction-sections -Wl,--gc-sections -fsigned-char -W -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-psabi -Wno-unnamed-type-template-args -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -Os -g -DDEBUG -D_DEBUG
Linker flags (Release): -Wl,--gc-sections
Linker flags (Debug): -Wl,--gc-sections

Sure, here it is (After the configuration part is done)

-----------------------------------------------------------------
Configuring done
CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_core" which requires target "zlib" that is not in any export set.
CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_core" which requires target "ittnotify" that is not in any export set.
CMake Error in CMakeLists.txt:
 export called with target "opencv_core" which requires target "zlib" that
 is not in any export set.


CMake Error in CMakeLists.txt:
 export called with target "opencv_core" which requires target "ittnotify"
 that is not in any export set.


Generating done
18

Hi,

Any update on this? Did I miss any info? I guess it says Zlib is not found but I ensured zlib is correctly installed. I majorly concerned about these errors

CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_core" which requires target "zlib" that is not in any export set.
CMake Error: install(EXPORT "OpenCVModules" ...) includes target "opencv_core" which requires target "ittnotify" that is not in any export set.
19

not exactly. it states, that zlib is not in the export set

do you try to build static libs ?
(your program would need to be linked to zlib ad ittnotify later, and my guess now is, that those libs wont get installed along with the opencv libs, for reasons unknown)

20

Yes I left the BUILD_SHARED_LIBS option as checked. Should I uncheck it and try again?