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Merge pull request #27107 from Kumataro:fix27105
build: Check supported C++ standard features and user setting #27107 Close #27105 ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [x] There is a reference to the original bug report and related work - [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [x] The feature is well documented and sample code can be built with the project CMake
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@@ -64,6 +64,21 @@ Only 0- and 1-level deep module locations are supported, following command will
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cmake -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib ../opencv
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```
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## Build with C++ Standard setting {#tutorial_config_reference_general_cxx_standard}
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`CMAKE_CXX_STANDARD` option can be used to set C++ standard settings for OpenCV building.
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```.sh
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cmake -DCMAKE_CXX_STANDARD=17 ../opencv
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cmake --build .
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```
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- C++11 is default/required/recommended for OpenCV 4.x. C++17 is default/required/recomended for OpenCV 5.x.
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- If your compiler does not support required C++ Standard features, OpenCV configuration should be fail.
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- If you set older C++ Standard than required, OpenCV configuration should be fail.
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For workaround, `OPENCV_SKIP_CMAKE_CXX_STANDARD` option can be used to skip `CMAKE_CXX_STANDARD` version check.
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- If you set newer C++ Standard than recomended, numerous warnings may appear or OpenCV build may fail.
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## Debug build {#tutorial_config_reference_general_debug}
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