Patch librealsense v2.44.0 to include <chrono> for system_clock
#7074
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Fixes: C:\gitP\isl-org\Open3D\build_amd64\librealsense\src\ext_librealsense\src\backend.h(108,79): error C2039: 'system_clock': is not a member of 'std::chrono' And cascaded: C:\gitP\isl-org\Open3D\build_amd64\librealsense\src\ext_librealsense\src\backend.cpp(28,88): error C2039: 'system_clock': is not a member of 'std::chrono' C:\gitP\isl-org\Open3D\build_amd64\librealsense\src\ext_librealsense\src\mf\mf-backend.h(31,26): error C2039: 'high_resolution_clock': is not a member of 'std::chrono' C:\gitP\isl-org\Open3D\build_amd64\librealsense\src\ext_librealsense\src\mf\mf-backend.cpp(26,9): error C2512: 'std::chrono::time_point': no appropriate default constructor available
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I work on Microsoft Visual C++, where we regularly build popular open-source projects, including yours, with development builds of our compiler and libraries to detect and prevent shipping regressions that would affect you. This also allows us to provide advance notice of breaking changes, which is the case here.
I just merged microsoft/STL#5105, which revealed a conformance issue in librealsense used by Open3D.
Compiler error with this STL change:
librealsense was assuming that including
<thread>makes thechrono::system_clocktype available, which is not guaranteed by the C++ Standard.I'm adding a patch to properly include
<chrono>and updating librealsense.cmake to apply it.(Note that upstream librealsense needs a different patch, for which I've created IntelRealSense/librealsense#13537. This would be relevant if you merged an update like #6714.)
I've verified that building Open3D with microsoft/STL
mainfails without this patch and succeeds with it.