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No luck on building this.

Via Octopy on Manjaro I get the following error:
[ 65%] Building CXX object openMVG/sfm/CMakeFiles/openMVG_sfm.dir/sfm_report.cpp.o
[ 65%] Linking CXX shared library ../../Linux-x86_64-RELEASE/libopenMVG_sfm.so
make[2]: Leaving directory '/tmp/yaourt-tmp-sebastien/aur-openmvg-git/src/openmvg_build'
[ 65%] Built target openMVG_sfm
make[1]: Leaving directory '/tmp/yaourt-tmp-sebastien/aur-openmvg-git/src/openmvg_build'
make: *** [Makefile:147: all] Error 2
==> ERROR: A failure occurred in build().
    Aborting...
==> ERROR: Makepkg was unable to build openmvg-git.
==> Restart building openmvg-git ? [y/N]

If I try to build the sotware manually I get a different error:

Scanning dependencies of target openMVG_sample_image_undistort
make[2]: Leaving directory '/media/Data/Sources/openMVG_Build'
make[2]: Entering directory '/media/Data/Sources/openMVG_Build'
[ 74%] Building CXX object openMVG_Samples/image_undistort_gui/CMakeFiles/openMVG_sample_image_undistort.dir/openMVG_sample_image_undistort_autogen/mocs_compilation.cpp.o
[ 75%] Building CXX object openMVG_Samples/image_undistort_gui/CMakeFiles/openMVG_sample_image_undistort.dir/main.cc.o
[ 75%] Building CXX object openMVG_Samples/image_undistort_gui/CMakeFiles/openMVG_sample_image_undistort.dir/MainWindow.cc.o
[ 75%] Building CXX object openMVG_Samples/image_undistort_gui/CMakeFiles/openMVG_sample_image_undistort.dir/QImageInterface.cc.o
/media/Data/Sources/openMVG/src/openMVG_Samples/image_undistort_gui/QImageInterface.cc: In function ‘openMVG::image::Image<openMVG::image::Rgb<unsigned char> > image_undistort_gui::QImageToOpenMVGImage(const QImage&)’:
/media/Data/Sources/openMVG/src/openMVG_Samples/image_undistort_gui/QImageInterface.cc:68:53: warning: ‘int QImage::byteCount() const’ is deprecated: Use sizeInBytes [-Wdeprecated-declarations]
   68 |   std::copy( tmp.bits(), tmp.bits() + tmp.byteCount(), reinterpret_cast<unsigned char *>( res.data() ) );
      |                                                     ^
In file included from /usr/include/qt/QtGui/QImage:1,
                 from /media/Data/Sources/openMVG/src/openMVG_Samples/image_undistort_gui/QImageInterface.hh:15,
                 from /media/Data/Sources/openMVG/src/openMVG_Samples/image_undistort_gui/QImageInterface.cc:9:
/usr/include/qt/QtGui/qimage.h:221:44: note: declared here
  221 |     QT_DEPRECATED_X("Use sizeInBytes") int byteCount() const;
      |                                            ^~~~~~~~~
[ 75%] Linking CXX executable ../../Linux-x86_64-RELEASE/openMVG_sample_image_undistort
/usr/bin/ld: CMakeFiles/openMVG_sample_image_undistort.dir/main.cc.o: in function `image_undistort_gui::MainWindow::~MainWindow()':
main.cc:(.text._ZN19image_undistort_gui10MainWindowD2Ev[_ZN19image_undistort_gui10MainWindowD5Ev]+0xc): undefined reference to `vtable for image_undistort_gui::MainWindow'
/usr/bin/ld: CMakeFiles/openMVG_sample_image_undistort.dir/main.cc.o: in function `non-virtual thunk to image_undistort_gui::MainWindow::~MainWindow()':
main.cc:(.text._ZN19image_undistort_gui10MainWindowD2Ev[_ZN19image_undistort_gui10MainWindowD5Ev]+0x8c): undefined reference to `vtable for image_undistort_gui::MainWindow'
/usr/bin/ld: CMakeFiles/openMVG_sample_image_undistort.dir/main.cc.o: in function `image_undistort_gui::MainWindow::~MainWindow()':
main.cc:(.text._ZN19image_undistort_gui10MainWindowD0Ev[_ZN19image_undistort_gui10MainWindowD5Ev]+0xc): undefined reference to `vtable for image_undistort_gui::MainWindow'
/usr/bin/ld: CMakeFiles/openMVG_sample_image_undistort.dir/main.cc.o: in function `non-virtual thunk to image_undistort_gui::MainWindow::~MainWindow()':
main.cc:(.text._ZN19image_undistort_gui10MainWindowD0Ev[_ZN19image_undistort_gui10MainWindowD5Ev]+0x83): undefined reference to `vtable for image_undistort_gui::MainWindow'
/usr/bin/ld: CMakeFiles/openMVG_sample_image_undistort.dir/MainWindow.cc.o: in function `image_undistort_gui::MainWindow::MainWindow(QWidget*)':
MainWindow.cc:(.text+0x2ae7): undefined reference to `vtable for image_undistort_gui::MainWindow'
/usr/bin/ld: CMakeFiles/openMVG_sample_image_undistort.dir/MainWindow.cc.o: in function `image_undistort_gui::MainWindow::onExportImage()':
MainWindow.cc:(.text+0x2c41): undefined reference to `image_undistort_gui::MainWindow::staticMetaObject'
/usr/bin/ld: CMakeFiles/openMVG_sample_image_undistort.dir/MainWindow.cc.o: in function `image_undistort_gui::MainWindow::onOpenImage()':
MainWindow.cc:(.text+0x2f53): undefined reference to `image_undistort_gui::MainWindow::staticMetaObject'
collect2: error: ld returned 1 exit status
make[2]: *** [openMVG_Samples/image_undistort_gui/CMakeFiles/openMVG_sample_image_undistort.dir/build.make:160: Linux-x86_64-RELEASE/openMVG_sample_image_undistort] Error 1
make[2]: Leaving directory '/media/Data/Sources/openMVG_Build'
make[1]: *** [CMakeFiles/Makefile2:3574: openMVG_Samples/image_undistort_gui/CMakeFiles/openMVG_sample_image_undistort.dir/all] Error 2
make[1]: Leaving directory '/media/Data/Sources/openMVG_Build'
make: *** [Makefile:147: all] Error 2

Is it also linked to the gcc version used? I have gcc version 9.3 and gcc8 installed.

@bartus that worked =) good catch on that gcc8 issue.

==> Finished making: openmvg-git 1.3.r78.g4f94981a-8

@wdna This is a gcc-8 hickup, just rolling back to gcc6 for now. Tell me if it's working now.

Hey, I'm getting the following error both on manual build and this package:

[ 67%] Building CXX object openMVG_Samples/multiview_robust_essential_ba/CMakeFiles/openMVG_sample_multiview_robustEssential_ba.dir/robust_essential_ba.cpp.o
In file included from /usr/include/c++/8.1.0/map:60,
                 from /usr/include/eigen3/Eigen/SparseCore:16,
                 from /var/cache/pacman/pkg/openmvg-git19815/openmvg-git/src/openMVG/src/openMVG/numeric/eigen_alias_definition.hpp:18,
                 from /var/cache/pacman/pkg/openmvg-git19815/openmvg-git/src/openMVG/src/openMVG/multiview/projection.hpp:32,
                 from /var/cache/pacman/pkg/openmvg-git19815/openmvg-git/src/openMVG/src/openMVG/geometry/pose3.hpp:12,
                 from /var/cache/pacman/pkg/openmvg-git19815/openmvg-git/src/openMVG/src/openMVG/cameras/Camera_Intrinsics.hpp:15,
                 from /var/cache/pacman/pkg/openmvg-git19815/openmvg-git/src/openMVG/src/openMVG/sfm/sfm_data.hpp:14,
                 from /var/cache/pacman/pkg/openmvg-git19815/openmvg-git/src/openMVG/src/software/SfM/main_evalQuality.cpp:9:
/usr/include/c++/8.1.0/bits/stl_tree.h: In instantiation of ‘class std::_Rb_tree<std::__cxx11::basic_string<char>, std::pair<const std::__cxx11::basic_string<char>, Eigen::Matrix<double, 3, 3> >, std::_Select1st<std::pair<const std::__cxx11::basic_string<char>, Eigen::Matrix<double, 3, 3> > >, Eigen::aligned_allocator<Eigen::Matrix<double, 3, 3> >, std::allocator<std::pair<const std::__cxx11::basic_string<char>, Eigen::Matrix<double, 3, 3> > > >’:
/usr/include/c++/8.1.0/bits/stl_map.h:151:17:   required from ‘class std::map<std::__cxx11::basic_string<char>, Eigen::Matrix<double, 3, 3>, Eigen::aligned_allocator<Eigen::Matrix<double, 3, 3> > >’
/var/cache/pacman/pkg/openmvg-git19815/openmvg-git/src/openMVG/src/software/SfM/io_readGT.hpp:144:65:   required from here
/usr/include/c++/8.1.0/bits/stl_tree.h:452:21: error: static assertion failed: comparison object must be invocable with two arguments of key type
       static_assert(__is_invocable<_Compare&, const _Key&, const _Key&>{},
                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
make[2]: *** [software/SfM/CMakeFiles/openMVG_main_evalQuality.dir/build.make:63: software/SfM/CMakeFiles/openMVG_main_evalQuality.dir/main_evalQuality.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:3124: software/SfM/CMakeFiles/openMVG_main_evalQuality.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
[ 67%] Linking CXX executable ../../Linux-x86_64-RELEASE/openMVG_main_ChangeLocalOrigin
[ 67%] Built target openMVG_main_ChangeLocalOrigin
[ 67%] Linking CXX executable ../../Linux-x86_64-RELEASE/openMVG_main_SfMInit_ImageListing
[ 67%] Built target openMVG_main_SfMInit_ImageListing
[ 67%] Linking CXX executable ../../Linux-x86_64-RELEASE/openMVG_sample_multiview_robustEssential
[ 67%] Built target openMVG_sample_multiview_robustEssential
[ 67%] Linking CXX executable ../../Linux-x86_64-RELEASE/openMVG_sample_multiview_robustEssential_ba
[ 67%] Built target openMVG_sample_multiview_robustEssential_ba
[ 68%] Linking CXX executable ../../Linux-x86_64-RELEASE/openMVG_sample_multiview_robustEssential_spherical
[ 68%] Built target openMVG_sample_multiview_robustEssential_spherical
make: *** [Makefile:130: all] Error 2
==> ERROR: A failure occurred in build().
    Aborting...

What's missing here?

@nicolasvilla: ~No it shouldn't. The issue was related to openmvg FindFlann.cmake not utilizing flanns pkg-config script which exports libraries that needs to be linked alongside flann(external) (mainly flann_cpp,lz4, see /usr/lib/pkgconfig/flann.pc#Libs). Check CMakeCache.txt if lz4 flag is in openMVG_matching_LIB_DEPENDS variable (this is sourced from PC_FLANN_LIBRARIES:INTERNAL=flann;flann_cpp;lz4).~

Edit: find the issue in flann package, have it fixed on my os for a long time and forgot to report to the maintainer, I made some temporary changes till flann gets patched...

Hi. I still cannot compile OpenMVG on my machine. OpenMVG build is still using FLANN: 1.9.1 (external) Does it requires an additional patch regarding the undefined LZ4.... messages?

@Harvie: * lz4: problem lays in FindFlann.cmake {flann.patch} see this issue: https://github.com/openMVG/openMVG/issues/1265. I made a pull-req addressing this issue, think I can include it as a patch since pull-req gets through.

Author of OpenMVE suggests us to use the internal version of FLANN. You can force to use the internal one by removing the flann from your depends array and remove the DFLANN_INCLUDE_DIR_HINTS.

https://github.com/openMVG/openMVG/issues/1272#issuecomment-378489529

Cmake says "** Build OpenCV+OpenMVG samples programs: OFF". Is it possibly reason, why openMVG/src/software/ isn't built? I've posted this question to upstream https://github.com/openMVG/openMVG/issues/1273

Please build and include scripts from openMVG/src/software/ directory of git.

Especially these two are super important to build and include in package:

openMVG/src/software/SfM/SfM_GlobalPipeline.py.in openMVG/src/software/SfM/SfM_SequentialPipeline.py.in