Help with QtGStreamer undefined reference to QGST::init

[JackCWallace]

Do you have any ideas that could help?

[SGaist]

Recheck your pro file: do you have any line line QT = or INCLUDEPATH = ? Note the missing +

[JackCWallace]

No, this is my code:

# This is a qmake project file, provided as an example on how to use qmake with QtGStreamer.

TEMPLATE = app
TARGET = player

# produce nice compilation output
CONFIG += silent

# Tell qmake to use pkg-config to find QtGStreamer.
CONFIG += pkgconfig

# Now tell qmake to link to QtGStreamer and also use its include path and Cflags.
contains(QT_VERSION, ^4\\..*) {
    PKGCONFIG += QtGStreamer-1.0 QtGStreamerUi-1.0
}
contains(QT_VERSION, ^5\\..*) {
    PKGCONFIG += Qt5GStreamer-1.0 Qt5GStreamerUi-1.0
}

QT += core quick widgets
CONFIG += qt console bootstrap

# Recommended if you are using g++ 4.5 or later. Must be removed for other compilers.
#QMAKE_CXXFLAGS += -std=c++0x

# Recommended, to avoid possible issues with the "emit" keyword
# You can otherwise also define QT_NO_EMIT, but notice that this is not a documented Qt macro.
DEFINES += QT_NO_KEYWORDS

# Input
HEADERS += mediaapp.h player.h
SOURCES += main.cpp mediaapp.cpp player.cpp

INCLUDEPATH += C:\qt-gstreamer-1.2.0\src

Line 3 and 4 (TEMPLATE and TARGET) made no difference when I added a '+' before the '='

[SGaist]

TEMPLATE and TARGET should be used with = . They contain only one value.

Do you still have that error if you don't use pkgconfig ?

[JackCWallace]

@SGaist Yes, If I take out the line for PKGCONFIG, I still get the same error

[SGaist]

Then create a default widget project and see if you can built it

[JackCWallace]

@SGaist Hi, I built an blank widget project, and I build one of the examples from Qt, and it worked fine

[SGaist]

Then keep that one and introduce one by one the elements of your other project until it either fails to build or build successfully

[JackCWallace]

For every element in the pro file, it does not fail if I put '#include <QGst/Init>' then I get the error 'QtCore/QtGlobal: No such file or directory' Then if I comment it back out, and run qmake, then build, I get no error. If I comment it out I get the error 'cannot find boost/config.hpp' until I run qmake again.

I added 'C:\boost_1_58_0' to the include path, commented out '#include <QGst/Init>' ran qmake, and uncommented it, and it built with no error. Then I ran qmake again, and it game me the 'QtCore/QtGlobal' error again

[SGaist]

Ok… Then the silly question: do you have a QtGlobal file ? If so where is it ?

[JackCWallace]

Yes, I have 5 copies, they are in
"C:\Qt\Qt5.4.1\5.4\android_armv5\include\QtCore\QtGlobal"
"C:\Qt\Qt5.4.1\5.4\android_armv7\include\QtCore\QtGlobal"
"C:\Qt\Qt5.4.1\5.4\android_x86\include\QtCore\QtGlobal"
"C:\Qt\Qt5.4.1\5.4\mingw491_32\include\QtCore\QtGlobal"
"C:\Qt\Qt5.4.1\5.4\Src\qtbase\include\QtCore\QtGlobal"

Should I have a different one somewhere else? I am building with Mingw

[SGaist]

Did you modify your kits ?

[JackCWallace]

No, I even just got done uninstalling and reinstalling Qt 5.4.1 and QtCreator 3.3.2 and I just got the same QtCore error

[JackCWallace]

I then added the pkgconfig and config then instead of '#include <QGst/Init>' I did '#include <QGst/init.h>' and I got back to the error of undefined reference to 'QGst::init

[SGaist]

Check the output of pkg-config for QtGStreamer, compare it to the build output of your application. Check the -I lines to see if something is currently modifying them in the wrong way