Opencv Build From Source Python binding problem

cudawarped · October 27, 2023, 7:58am

No. By default you cannot generate python bindings for a Debug build which from my understanding is why you have two builds:

Release build for python bindings
Debug build for C++

Is this correct? If not you could just use a single Release build to generate both python bindings and C++ libraries.

The changes mentioned allow you to build a Debug build for python meaning that you can just work with a Debug build for both generating python bindings and C++ libs.

I am pretty sure that unless you specify

-DBUILD_WITH_STATIC_CRT=ON

OpenCV will be linked against the dynamic CRT. i.e. you need to specify Multi-threaded Debug DLL (/MD) in your project which links to OpenCV. You can check the CMake file to be sure

github.com

opencv/opencv/blob/588ddf1b181aa7243144b27d65fc7690fb89e344/cmake/OpenCVCRTLinkage.cmake#L36


      
          
            # Mandatory
            set(CMAKE_MODULE_LINKER_FLAGS_DEBUG  "${CMAKE_MODULE_LINKER_FLAGS_DEBUG} /INCREMENTAL:NO /OPT:NOREF /OPT:NOICF")
            set(CMAKE_EXE_LINKER_FLAGS_DEBUG     "${CMAKE_EXE_LINKER_FLAGS_DEBUG} /INCREMENTAL:NO /OPT:NOREF /OPT:NOICF")
            set(CMAKE_SHARED_LINKER_FLAGS_DEBUG  "${CMAKE_SHARED_LINKER_FLAGS_DEBUG} /INCREMENTAL:NO /OPT:NOREF /OPT:NOICF")
          endif()
          
          # Ignore warning: This object file does not define any previously undefined public symbols, ...
          set(CMAKE_STATIC_LINKER_FLAGS "${CMAKE_STATIC_LINKER_FLAGS} /IGNORE:4221")
          
          if(NOT BUILD_SHARED_LIBS AND BUILD_WITH_STATIC_CRT)
            foreach(flag_var
                    CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE
                    CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO
                    CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
                    CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
              if(${flag_var} MATCHES "/MD")
                string(REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
              endif()
              if(${flag_var} MATCHES "/MDd")
                string(REGEX REPLACE "/MDd" "/MTd" ${flag_var} "${${flag_var}}")

Why are you are changing the default shared library configuration as this is causing you lots of issues which if you left them as defaults you would not have?

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Opencv Build From Source Python binding problem

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