Hi Whizzkid!

First of all thanks a lot for this repo. I have been trying to build opencv from source for two days and using your scripts is the first time I could build it successfully.

I'm relatively new to openCV, so pardon my potentially dumb question.

1. In this guide you mention: $HOME/.opencv/lib/pythonX.X/dist-package
   but I can't seem to find .opencv file in my directory. So not sure which python version I should put it in.

2. does it mean that the library compiled only work for python project? (using import in python script)? How about for C++ projects? Does it need to be added into environment or sth? I was trying to call open cv through "#include <opencv2/core/version.hpp>" but couldn't make it work. or do I need to put the folder somewhere inside the project?

I'm trying to do a python opencv with cuda accel, using https://github.com/alexanderkoumis/opencv-gpu-py . but I couldn't build the opencv through his guide.

Please helpppppp :( THANKS A LOTT!!

First of all,I want to say I love the script put forth in here. Simply amazing, detailed and easy to interpret.
Every package installation and download worked A-Ok but during build I came across this issue after 9% of build.

In file included from /home/imr555/Desktop/opencv/ceres-solver/include/ceres/internal/numeric_diff.h:43:0, from /home/imr555/Desktop/opencv/ceres-solver/include/ceres/dynamic_numeric_diff_cost_function.h:44, from /home/imr555/Desktop/opencv/ceres-solver/include/ceres/gradient_checker.h:42, from /home/imr555/Desktop/opencv/ceres-solver/internal/ceres/gradient_checker.cc:33: /home/imr555/Desktop/opencv/ceres-solver/include/ceres/internal/fixed_array.h: In static member function ‘static constexpr bool ceres::internal::FixedArray<T, N, A>::DefaultConstructorIsNonTrivial()’: /home/imr555/Desktop/opencv/ceres-solver/include/ceres/internal/fixed_array.h:103:13: error: ‘is_trivially_default_constructible’ is not a member of ‘std’ return !std::is_trivially_default_constructible<StorageElement>::value; ^ /home/imr555/Desktop/opencv/ceres-solver/include/ceres/internal/fixed_array.h:103:67: error: expected primary-expression before ‘>’ token return !std::is_trivially_default_constructible<StorageElement>::value; ^ /home/imr555/Desktop/opencv/ceres-solver/include/ceres/internal/fixed_array.h:103:68: error: ‘::value’ has not been declared return !std::is_trivially_default_constructible<StorageElement>::value; ^ In file included from /home/imr555/Desktop/opencv/ceres-solver/include/ceres/internal/numeric_diff.h:43:0, from /home/imr555/Desktop/opencv/ceres-solver/include/ceres/dynamic_numeric_diff_cost_function.h:44, from /home/imr555/Desktop/opencv/ceres-solver/include/ceres/gradient_checker.h:42, from /home/imr555/Desktop/opencv/ceres-solver/internal/ceres/gradient_checking_cost_function.cc:41: /home/imr555/Desktop/opencv/ceres-solver/include/ceres/internal/fixed_array.h: In static member function ‘static constexpr bool ceres::internal::FixedArray<T, N, A>::DefaultConstructorIsNonTrivial()’: /home/imr555/Desktop/opencv/ceres-solver/include/ceres/internal/fixed_array.h:103:13: error: ‘is_trivially_default_constructible’ is not a member of ‘std’ return !std::is_trivially_default_constructible<StorageElement>::value; ^ /home/imr555/Desktop/opencv/ceres-solver/include/ceres/internal/fixed_array.h:103:67: error: expected primary-expression before ‘>’ token return !std::is_trivially_default_constructible<StorageElement>::value; ^ /home/imr555/Desktop/opencv/ceres-solver/include/ceres/internal/fixed_array.h:103:68: error: ‘::value’ has not been declared return !std::is_trivially_default_constructible<StorageElement>::value; ^ /home/imr555/Desktop/opencv/ceres-solver/include/ceres/internal/fixed_array.h: In instantiation of ‘static constexpr bool ceres::internal::FixedArray<T, N, A>::DefaultConstructorIsNonTrivial() [with T = double; long unsigned int N = 18446744073709551615ul; A = std::allocator<double>]’: /home/imr555/Desktop/opencv/ceres-solver/include/ceres/internal/fixed_array.h:137:40: required from ‘ceres::internal::FixedArray<T, N, A>::FixedArray(ceres::internal::FixedArray<T, N, A>::size_type, const allocator_type&) [with T = double; long unsigned int N = 18446744073709551615ul; A = std::allocator<double>; ceres::internal::FixedArray<T, N, A>::size_type = long unsigned int; ceres::internal::FixedArray<T, N, A>::allocator_type = std::allocator<double>]’ /home/imr555/Desktop/opencv/ceres-solver/include/ceres/internal/numeric_diff.h:126:66: required from ‘static bool ceres::internal::NumericDiff<CostFunctor, kMethod, kNumResiduals, ParameterDims, kParameterBlock, kParameterBlockSize>::EvaluateJacobianForParameterBlock(const CostFunctor*, const double*, const ceres::NumericDiffOptions&, int, int, int, double**, double*) [with CostFunctor = ceres::CostFunction; ceres::NumericDiffMethodType kMethod = (ceres::NumericDiffMethodType)0u; int kNumResiduals = -1; ParameterDims = ceres::internal::ParameterDims<true>; int kParameterBlock = -1; int kParameterBlockSize = -1]’ /home/imr555/Desktop/opencv/ceres-solver/include/ceres/dynamic_numeric_diff_cost_function.h:146:35: required from ‘bool ceres::DynamicNumericDiffCostFunction<CostFunctor, method>::Evaluate(const double* const*, double*, double**) const [with CostFunctor = ceres::CostFunction; ceres::NumericDiffMethodType method = (ceres::NumericDiffMethodType)0u]’ /home/imr555/Desktop/opencv/ceres-solver/internal/ceres/gradient_checker.cc:277:1: required from here /home/imr555/Desktop/opencv/ceres-solver/include/ceres/internal/fixed_array.h:104:3: error: body of constexpr function ‘static constexpr bool ceres::internal::FixedArray<T, N, A>::DefaultConstructorIsNonTrivial() [with T = double; long unsigned int N = 18446744073709551615ul; A = std::allocator<double>]’ not a return-statement } ^ internal/ceres/CMakeFiles/ceres.dir/build.make:1142: recipe for target 'internal/ceres/CMakeFiles/ceres.dir/gradient_checking_cost_function.cc.o' failed make[2]: *** [internal/ceres/CMakeFiles/ceres.dir/gradient_checking_cost_function.cc.o] Error 1 make[2]: *** Waiting for unfinished jobs.... internal/ceres/CMakeFiles/ceres.dir/build.make:1118: recipe for target 'internal/ceres/CMakeFiles/ceres.dir/gradient_checker.cc.o' failed make[2]: *** [internal/ceres/CMakeFiles/ceres.dir/gradient_checker.cc.o] Error 1 CMakeFiles/Makefile2:1861: recipe for target 'internal/ceres/CMakeFiles/ceres.dir/all' failed make[1]: *** [internal/ceres/CMakeFiles/ceres.dir/all] Error 2 Makefile:138: recipe for target 'all' failed make: *** [all] Error 2

Might be some sort of issue in the latest ceres package. I did a bit of googling. But haven't been able to build it successfully yet. I am fairly new to this. So, suggestions on running this script locally would also be helpful :) . Any suggestions would be helpful. Thanks in advance

It doesn't work on Manjaro that use pacman

Hello!

Thank you for such a helpful script.

I suggest you to configure following cmake options (as shown in opencv/opencv#9549):

-DBUILD_PROTOBUF=OFF
-DPROTOBUF_UPDATE_FILES=ON

Without these options compilation fails with different protobuf errors. I've checked this on protobuf versions 3.4.x and 3.5.x - in both cases these options let me avoid error messages.