How to handle with 'Policy CMP0074 is not set' error while using Cmake to build PCL tutorials?

Question

I want to complete this basic tutorial.

http://pointclouds.org/documentation/tutorials/writing_pcd.php#writing-pcd

Its very simple. When I prepare cmakelist and .cpp file, I run them with cmake gui and I get this error. I installed pcl 1.9.1 so I build file for visual studio 2017 64x.

Selecting Windows SDK version 10.0.17134.0 to target Windows 10.0.17763. The C compiler identification is MSVC 19.15.26726.0 The CXX compiler identification is MSVC 19.15.26726.0 Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.15.26726/bin/Hostx86/x64/cl.exe Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.15.26726/bin/Hostx86/x64/cl.exe -- works Detecting C compiler ABI info Detecting C compiler ABI info - done Detecting C compile features Detecting C compile features - done Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.15.26726/bin/Hostx86/x64/cl.exe Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.15.26726/bin/Hostx86/x64/cl.exe -- works Detecting CXX compiler ABI info Detecting CXX compiler ABI info - done Detecting CXX compile features Detecting CXX compile features - done CMake Warning (dev) at CMakeLists.tx t:5 (find_package): Policy CMP0074 is not set: find_package uses _ROOT variables. Run "cmake --help-policy CMP0074" for policy details. Use the cmake_policy command to set the policy and suppress this warning.

Environment variable PCL_ROOT is set to:

 C:\\libraries\\PCL 1.9.1 

For compatibility, CMake is ignoring the variable. This warning is for project developers. Use -Wno-dev to suppress it.

Found Eigen: C:/libraries/PCL 1.9.1/3rdParty/Eigen/eigen3 Eigen found (include: C:/libraries/PCL 1.9.1/3rdParty/Eigen/eigen3, version: 3.3.5) Looking for pthread.h Looking for pthread.h - not found Found Threads: TRUE Found Boost: C:/libraries/PCL 1.9.1/3rdParty/Boost/include/boost-1_68 (found suitable version "1.68.0", minimum required is "1.40.0") found components: system filesystem thread date_time iostreams serialization chrono atomic regex Found FLANN: C:/libraries/PCL 1.9.1/3rdParty/FLANN/lib/flann_cpp_s.lib FLANN found (include: C:/libraries/PCL 1.9.1/3rdParty/FLANN/include, lib: optimized;C:/libraries/PCL 1.9.1/3rdParty/FLANN/lib/flann_cpp_s.lib;debug;C:/libraries/PCL 1.9.1/3rdParty/FLANN/lib/flann_cpp_s-gd.lib) FLANN found (include: C:/libraries/PCL 1.9.1/3rdParty/FLANN/include, lib: optimized;C:/libraries/PCL 1.9.1/3rdParty/FLANN/lib/flann_cpp_s.lib;debug;C:/libraries/PCL 1.9.1/3rdParty/FLANN/lib/flann_cpp_s-gd.lib) Found OpenNI2: C:/libraries/OpenNI2/Lib/OpenNI2.lib OpenNI2 found (include: C:/libraries/OpenNI2/Include, lib: C:/libraries/OpenNI2/Lib/OpenNI2.lib) OpenNI2 found (include: C:/libraries/OpenNI2/Include, lib: C:/libraries/OpenNI2/Lib/OpenNI2.lib) Found Qhull: optimized;C:/libraries/PCL 1.9.1/3rdParty/Qhull/lib/qhullstatic.lib;debug;C:/libraries/PCL 1.9.1/3rdParty/Qhull/lib/qhullstatic_d.lib QHULL found (include: C:/libraries/PCL 1.9.1/3rdParty/Qhull/include, lib: optimized;C:/libraries/PCL 1.9.1/3rdParty/Qhull/lib/qhullstatic.lib;debug;C:/libraries/PCL 1.9.1/3rdParty/Qhull/lib/qhullstatic_d.lib) looking for PCL_COMMON Found PCL_COMMON: C:/libraries/PCL 1.9.1/lib/pcl_common_release.lib
looking for PCL_KDTREE Found PCL_KDTREE: C:/libraries/PCL 1.9.1/lib/pcl_kdtree_release.lib looking for PCL_OCTREE Found PCL_OCTREE: C:/libraries/PCL 1.9.1/lib/pcl_octree_release.lib
looking for PCL_SEARCH Found PCL_SEARCH: C:/libraries/PCL 1.9.1/lib/pcl_search_release.lib looking for PCL_SAMPLE_CONSENSUS Found PCL_SAMPLE_CONSENSUS: C:/libraries/PCL 1.9.1/lib/pcl_sample_consensus_release.lib looking for PCL_FILTERS Found PCL_FILTERS: C:/libraries/PCL 1.9.1/lib/pcl_filters_release.lib looking for PCL_2D Found PCL_2D: C:/libraries/PCL 1.9.1/include/pcl-1.9 looking for PCL_GEOMETRY Found PCL_GEOMETRY: C:/libraries/PCL 1.9.1/include/pcl-1.9 looking for PCL_IO Found PCL_IO: C:/libraries/PCL 1.9.1/lib/pcl_io_release.lib looking for PCL_FEATURES Found PCL_FEATURES: C:/libraries/PCL 1.9.1/lib/pcl_features_release.lib looking for PCL_ML Found PCL_ML: C:/libraries/PCL 1.9.1/lib/pcl_ml_release.lib looking for PCL_SEGMENTATION Found PCL_SEGMENTATION: C:/libraries/PCL 1.9.1/lib/pcl_segmentation_release.lib looking for PCL_VISUALIZATION Found PCL_VISUALIZATION: C:/libraries/PCL 1.9.1/lib/pcl_visualization_release.lib looking for PCL_SURFACE Found PCL_SURFACE: C:/libraries/PCL 1. 9.1/lib/pcl_surface_release.lib looking for PCL_REGISTRATION Found PCL_REGISTRATION: C:/libraries/PCL 1.9.1/lib/pcl_registration_release.lib looking for PCL_KEYPOINTS Found PCL_KEYPOINTS: C:/libraries/PCL 1.9.1/lib/pcl_keypoints_release.lib looking for PCL_TRACKING Found PCL_TRACKING: C:/libraries/PCL 1.9.1/lib/pcl_tracking_release.lib
looking for PCL_RECOGNITION Found PCL_RECOGNITION: C:/libraries/PCL 1.9.1/lib/pcl_recognition_release.lib looking for PCL_STEREO Found PCL_STEREO: C:/libraries/PCL 1.9.1/lib/pcl_stereo_release.lib
looking for PCL_OUTOFCORE Found PCL_OUTOFCORE: C:/libraries/PCL 1.9.1/lib/pcl_outofcore_release.lib looking for PCL_PEOPLE Found PCL_PEOPLE: C:/libraries/PCL 1.9.1/lib/pcl_people_release.lib Found PCL: pcl_common;pcl_kdtree;pcl_octree;pcl_search;pcl_sample_consensus;pcl_filters;pcl_io;pcl_features;pcl_ml;pcl_segmentation;pcl_visualization;pcl_surface;pcl_registration;pcl_keypoints;pcl_tracking;pcl_recognition;pcl_stereo;pcl_outofcore;pcl_people;optimized;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_system-vc141-mt-x64-1_68.lib;debug;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_system-vc141-mt-gd-x64-1_68.lib;optimized;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_filesystem-vc141-mt-x64-1_68.lib;debug;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_filesystem-vc141-mt-gd-x64-1_68.lib;optimized;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_thread-vc141-mt-x64-1_68.lib;debug;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_thread-vc141-mt-gd-x64-1_68.lib;optimi zed;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_date_time-vc141-mt-x64-1_68.lib;debug;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_date_time-vc141-mt-gd-x64-1_68.lib;optimized;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_iostreams-vc141-mt-x64-1_68.lib;debug;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_iostreams-vc141-mt-gd-x64-1_68.lib;optimized;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_serialization-vc141-mt-x64-1_68.lib;debug;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_serialization-vc141-mt-gd-x64-1_68.lib;optimized;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_chrono-vc141-mt-x64-1_68.lib;debug;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_chrono-vc141-mt-gd-x64-1_68.lib;optimized;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_atomic-vc141-mt-x64-1_68.lib;debug;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_atomic-vc141-mt-gd-x64-1_68.lib;optimized;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_regex-vc141-mt-x64-1_68. lib;debug;C:/libraries/PCL 1.9.1/3rdParty/Boost/lib/libboost_regex-vc141-mt-gd-x64-1_68.lib;optimized;C:/libraries/PCL 1.9.1/3rdParty/Qhull/lib/qhullstatic.lib;debug;C:/libraries/PCL 1.9.1/3rdParty/Qhull/lib/qhullstatic_d.lib;C:/libraries/OpenNI2/Lib/OpenNI2.lib;optimized;C:/libraries/PCL 1.9.1/3rdParty/FLANN/lib/flann_cpp_s.lib;debug;C:/libraries/PCL 1.9.1/3rdParty/FLANN/lib/flann_cpp_s-gd.lib;vtksys;vtkCommonCore;vtkCommonMath;vtkCommonMisc;vtkCommonSystem;vtkCommonTransforms;vtkCommonDataModel;vtkCommonColor;vtkCommonExecutionModel;vtkCommonComputationalGeometry;vtkFiltersCore;vtkFiltersGeneral;vtkImagingCore;vtkImagingFourier;vtkalglib;vtkFiltersStatistics;vtkFiltersExtraction;vtkInfovisCore;vtkFiltersGeometry;vtkFiltersSources;vtkRenderingCore;vtkzlib;vtkfreetype;vtkRenderingFreeType;vtkRenderingContext2D;vtkChartsCore;vtkDICOMParser;vtklz4;vtkIOCore;vtkIOLegacy;vtkexpat;vtkIOXMLParser;vtkDomainsChemistry;vtkIOXML;vtkParallelCore;vtkFiltersAMR;vtkFiltersFlowPaths;vtkFiltersGeneric ;vtkImagingSources;vtkFiltersHybrid;vtkFiltersHyperTree;vtkImagingGeneral;vtkFiltersImaging;vtkFiltersModeling;vtkFiltersParallel;vtkFiltersParallelImaging;vtkFiltersPoints;vtkFiltersProgrammable;vtkFiltersSMP;vtkFiltersSelection;vtkFiltersTexture;vtkFiltersTopology;verdict;vtkFiltersVerdict;vtkmetaio;vtkjpeg;vtkpng;vtktiff;vtkIOImage;vtkImagingHybrid;vtkInfovisLayout;vtkInteractionStyle;vtkImagingColor;vtkRenderingAnnotation;vtkRenderingVolume;vtkInteractionWidgets;vtkViewsCore;vtkproj4;vtkGeovisCore;vtkhdf5_hl;vtkhdf5;vtkIOAMR;vtkIOEnSight;vtkNetCDF;vtkexoIIc;vtkIOExodus;vtkRenderingOpenGL;vtkRenderingContextOpenGL;vtkgl2ps;vtkRenderingGL2PS;vtklibharu;vtkIOExport;vtkRenderingLabel;vtkIOExportOpenGL;vtkIOGeometry;vtkIOImport;vtklibxml2;vtkIOInfovis;vtkIOLSDyna;vtkIOMINC;vtkoggtheora;vtkIOMovie;vtknetcdfcpp;vtkIONetCDF;vtkIOPLY;vtkjsoncpp;vtkIOParallel;vtkIOParallelXML;vtksqlite;vtkIOSQL;vtkIOTecplotTable;vtkIOVideo;vtkImagingMath;vtkImagingMorphological;vtkImagingStatistics;vtkImagin gStencil;vtkInteractionImage;vtkRenderingImage;vtkRenderingLIC;vtkRenderingLOD;vtkRenderingVolumeOpenGL;vtkViewsContext2D;vtkViewsInfovis (Required is at least version "1.2") Configuring done Generating done

After build, when I click open project and run it, I get this error.

Any solution for it?

Answer 1

The CMP0074 warning is not really a problem you as a user need to worry about. It's a warning for the developer of the CMakeLists.txt that a behavior in CMake has changed.

https://cmake.org/cmake/help/latest/policy/CMP0074.html

In CMake 3.12 and above the find_package() command now searches prefixes specified by the _ROOT CMake variable and the ROOT environment variable. Package roots are maintained as a stack so nested calls to all find * commands inside find modules also search the roots as prefixes. This policy provides compatibility with projects that have not been updated to avoid using _ROOT variables for other purposes.

The OLD behavior for this policy is to ignore _ROOT variables. The NEW behavior for this policy is to use _ROOT variables.

Basically the warning is that the developers of the CMakeLists.txt have not set the policy to enable the new behavior or to keep the old behavior however the PCL_ROOT was defined. CMake will not automatically use it because the new behavior is not enabled.

The ALL_BUILD error message is because the ALL_BUILD target / project is not an executable target. It's purpose is to force building of all projects in the solution. To fix that part you need to right click on an executable project / target in the Solution Explorer and click "Set this project as the startup project"