OpenCV static library in Yocto

OpenCV is built either as a shared object or a static library, not both. Yocto recipe in the meta-oe builds the library as shared objects, which is a sensible default for sure.

As a note to future self, one way to build a subset of OpenCV as a static library instead is to add the following in e.g. conf/local.conf

PACKAGECONFIG:pn-opencv = " gstreamer"

EXTRA_OECMAKE:append:pn-opencv = " \

                               -DBUILD_SHARED_LIBS=OFF \

                               -DENABLE_PIC=ON \

                               -DWITH_PROTOBUF=OFF \

                               -DBUILD_PROTOBUF=OFF \

                               -DBUILD_opencv_python2=OFF \

                               -DBUILD_opencv_python3=OFF \

                               -DBUILD_JAVA=OFF \

                               "


Comments

Post a Comment

Popular posts from this blog

iMovie event library on a network drive, NAS

I was shocked to find that iMovie '09 would not allow storing event libraries on networked disks. The AFP volume would show up, but remain non-functional with a yellow exclamation sign. There are plenty of instructions for hacking around the limitation with clumsy symbolic links. I discovered a much simpler approach, using an undocumented (?) setting built right into iMovie:"Allow Network Volumes". Use at your own risk, try the following command in Terminal defaults write -app iMovie allowNV -bool true
Read more

Proxmox PCIe passthrough on HP gen8 - failed to set iommu for container

Problem Setting up PCIe passthrough from host to a VM was supposed to be easy. However, being an HP server, there was a bit more to it than usual. The VM simply refused to start when configured use Nvidia GPU from the host: vfio error: 0000:04:00.0: failed to setup container for group 21: failed to set iommu for container: Operation not permitted In dmesg there was a bit more background on what was wrong: fio-pci 0000:04:00.1: Device is ineligible for IOMMU domain attach due to platform RMRR requirement.  Contact your platform vendor. Luckily, HP had issued a customer advisory on this. It describes a convoluted method to disable this RMRR per slot basis. It seems to work for me, so I thought I'd write down some notes if I ever run into this again. Basic setup Proxmox has decent instructions for preparing the host for passthrough setup in general, in summary: -  add  intel_iommu=on to   GRUB_CMDLINE_LINUX_DEFAULT  in the file  /etc/default/grub - add vfio modules to  /etc/modules
Read more

Backup and restore observium

Note to self, how to backup and restore an Observium installation such as Turn Key Linux . backup mysqldump --all--databases >sql.txt tar zcvf rrd.tgz /opt/observium/rrd restore log in at https://observium:12322/ as adminer import the sql.txt tar zxvf  rrd.tgz -C /
Read more