Updates for C++17 compilation required on some systems linking against kwiver master #781
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- Change fletch_BUILD_CXX11 option to fletch_BUILD_CXX17 with standard "17" - Add --extra-cxxflags="-std=c++17" to FFmpeg configure when enabled - Update OpenCV, VXL, libkml, and pybind11 to use fletch_BUILD_CXX17 - Add VXL patch file for vil_gauss_filter.cxx (original version) - Add libkml patch file for feature_list.cc (original version) - Update Patch.cmake files to conditionally apply C++17 patches - Update README documentation Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- VXL vil_gauss_filter.cxx: Replace deprecated std::bind2nd with lambda - libkml feature_list.cc: Remove deprecated std::binary_function inheritance These changes fix compilation errors when building with C++17, where std::bind2nd and std::binary_function were removed from the standard. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
daniel-riehm
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daniel-riehm
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I think it makes sense to have C++11 be the standard now that C++17 has superseded it, instead of the default still being C++98. Unless this causes a problem?
| endif() | ||
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| if(fletch_BUILD_CXX17) | ||
| list(APPEND FFMPEG_CONFIGURE_COMMAND --extra-cxxflags="-std=c++17") |
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I am confused here - isn't FFmpeg written in C, not C++?
| # OpenCV 3.3.0 has an option to enable C++ 11 | ||
| if (fletch_BUILD_CXX11) | ||
| if (fletch_BUILD_CXX17) | ||
| list(APPEND OpenCV_EXTRA_BUILD_FLAGS -DENABLE_CXX11:BOOL=ON) |
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Is -DENABLE_CXX11 still correct?
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On older versions, yes, there is no enable 17 so enable 11 is the closest thing and we still want to enable it when using 17
| add_custom_target(fletch-build-install) | ||
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| # Include CXX11 support | ||
| set(fletch_CXX_STANDARD_VERSION "98") |
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| set(fletch_CXX_STANDARD_VERSION "98") | |
| set(fletch_CXX_STANDARD_VERSION "11") |
Does this seem reasonable?
| if (NOT fletch_BUILD_CXX11) | ||
| message(FATAL_ERROR "CXX11 must be enabled to use pybind11") | ||
| if (NOT fletch_BUILD_CXX17) | ||
| message(FATAL_ERROR "CXX17 must be enabled to use pybind11") |
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Maybe remove this if the default standard is changed from 98 -> 11?
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I have no objections to changing the default to 11 if that doesn't mess up any other projects. I will always use the 17 option so it doesn't matter
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