Create a recipe for a QT5 application - yocto

Question

I have been struggling for too long, so I need help :)
I made a big QT5.8 application and usually when I want to compile it with my PC I just have to run the following command: qmake -qt=5.9 -spec linux-arm-gnueabihf-g++ -config configuration_name.
With this command, I can cross compile my source code for the armhf architecture using linux-arm-gnueabihf-g++ toolchain.
But now, as can easily create a yocto image for my target (Raspberry pi), I want to make a recipe in order to compile my qt software and put it into my image.
For now, I achieved to perform these following task in my recipe without errors:
do_fetch -> Yocto fetch the source from git repo (OK)
do_unpack -> OK
After that I want to perform a qmake command in order to generate my makefile, but here is my problem :/
First, I included the qmake5 class in my recipe using
require recipes-qt/qt5/qt5.inc
Then I tried a lot of things..
writing "qmake" into the do_configure task doesn't work. Last thing I tried was: '${OE_QMAKE_QMAKE} ${S}/my_software.pro -config my_config' but still the same error:
Could not find qmake spec 'linux-oe-g++'
I don't know what to do and I can't find any recipe exemple doing the things that I want to do.
If somebody already experienced this issue or have experience compiling qt5 software with a yocto recipe I would like your help :)
my recipe:
LICENSE = "CLOSED"
LIC_FILES_CHKSUM = " "
USERNAME = "****"
PASSWORD = "*****"
S = "${WORKDIR}/git"
require recipes-qt/qt5/qt5.inc
do_fetch(){
git clone http://${USERNAME}:${PASSWORD}#gitlab.....
}
do_configure () {
${OE_QMAKE_QMAKE} ${S}/my_software.pro -config my_config
}
Thanks

Answer 1

Short answer
Add "inherit qmake5" and let Yocto take care of it :)
Long answer
Here's an example of how I added a QT project. It is not using git, it is using local files. However for getting one step further I suggest:
Use my way as a test. Copy the QT project to /yocto/local_sources/Myproject/
and make this known to Yocto by using FILESEXTRAPATHS_prepend_ (as shown below).
If this works on your environment, adapt it to your needs (e.g. build from git instead of local_source, which is better off course.)
This way is tested and works also well for later remote-debugging with qt-creator and the yocto SDK by the way. Stick to Yocto, it's worth it in the end.
Here's my .bb file:
#
# Build QT xyz application
#
SUMMARY = "..."
SECTION = "Mysection"
LICENSE = "CLOSED"
#Add whatever you need here
DEPENDS += "qtbase qtmultimedia qtsvg"
#Add here your .pro and all other relevant files (if you use git later this step will be less tedious ...)
SRC_URI += "file://Myproject.pro"
SRC_URI += "file://*.h"
SRC_URI += "file://*.cpp"
SRC_URI += "file://subdir1/*.h"
SRC_URI += "file://subdir1/*.cpp"
SRC_URI += "file://subdir2/*.h"
SRC_URI += "file://subdir2/*.cpp"
SRC_URI += "file://subdir2/subdir3/*.h"
SRC_URI += "file://subdir2/subdir3/*.cpp"
#If you need autostart:
#SRC_URI += "file://myproject.service"
#Register for root file system aggregation
FILES_${PN} += "${bindir}/Myproject"
#RBE todo: both needed ?
FILESEXTRAPATHS_prepend_${PN} := "/yocto/local_sources/Myproject/Src:"
FILESEXTRAPATHS_prepend := "/yocto/local_sources/Myproject/Src:"
S = "${WORKDIR}"
#If you want to auto-start this add:
#SYSTEMD_SERVICE_${PN} = "Myproject.service"
FILES_${PN} = "${datadir} ${bindir} ${systemd_unitdir}"
FILES_${PN}-dbg = "${datadir}/${PN}/.debug"
FILES_${PN}-dev = "/usr/src"
#Check what's needed in your case ...
RDEPENDS_${PN} += "\
qtmultimedia-qmlplugins \
qtvirtualkeyboard \
qtquickcontrols2-qmlplugins \
gstreamer1.0-libav \
gstreamer1.0-plugins-base-audioconvert \
gstreamer1.0-plugins-base-audioresample \
gstreamer1.0-plugins-base-playback \
gstreamer1.0-plugins-base-typefindfunctions \
gstreamer1.0-plugins-base-videoconvert \
gstreamer1.0-plugins-base-videoscale \
gstreamer1.0-plugins-base-volume \
gstreamer1.0-plugins-base-vorbis \
gstreamer1.0-plugins-good-autodetect \
gstreamer1.0-plugins-good-matroska \
gstreamer1.0-plugins-good-ossaudio \
gstreamer1.0-plugins-good-videofilter \
"
do_install_append () {
# Install application
install -d ${D}${bindir}
install -m 0755 Myproject ${D}${bindir}/
# Uncomment if you want to autostart this application as a service
#install -Dm 0644 ${WORKDIR}/myproject.service ${D}${systemd_system_unitdir}/myproject.service
# Install resource files (example)
#install -d ${D}${datadir}/${PN}/Images
#for f in ${S}/Images/*; do \
# install -Dm 0644 $f ${D}${datadir}/${PN}/Images/
#done
}
#Also inherit "systemd" if you need autostart
inherit qmake5