Qt: Linking Framework on Mac: using rpath - c++

Question

I want to create a custom framework with Qt. I am able to create the framework itself, but Qt fails to find the framework when run:
dyld: Library not loaded: QSettingsDialog.framework/Versions/0/QSettingsDialog
Referenced from: /Users/sky/QtProjects/build-QSettingsDialog-Desktop_Qt_5_7_0_clang_64bit-Debug/Examples/SimpleExample/SimpleExample.app/Contents/MacOS/SimpleExample
Reason: image not found
The reason is simple: The binary does not know where to look for the framework.
I used otool on the binary and saw this:
otool -L Examples/SimpleExample/SimpleExample.app/Contents/MacOS/SimpleExample
Examples/SimpleExample/SimpleExample.app/Contents/MacOS/SimpleExample:
QSettingsDialog.framework/Versions/0/QSettingsDialog (compatibility version 0.1.0, current version 0.1.2)
#rpath/QtWidgets.framework/Versions/5/QtWidgets (compatibility version 5.7.0, current version 5.7.0)
#rpath/QtGui.framework/Versions/5/QtGui (compatibility version 5.7.0, current version 5.7.0)
#rpath/QtCore.framework/Versions/5/QtCore (compatibility version 5.7.0, current version 5.7.0)
/System/Library/Frameworks/DiskArbitration.framework/Versions/A/DiskArbitration (compatibility version 1.0.0, current version 1.0.0)
/System/Library/Frameworks/IOKit.framework/Versions/A/IOKit (compatibility version 1.0.0, current version 275.0.0)
/System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL (compatibility version 1.0.0, current version 1.0.0)
/System/Library/Frameworks/AGL.framework/Versions/A/AGL (compatibility version 1.0.0, current version 1.0.0)
/usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 120.1.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1226.10.1)
So, my question is as follows (For more details check the stuff below):
How can tell qmake to set the path for my library to:
#rpath/QSettingsDialog.framework/Versions/0/QSettingsDialog (compatibility version 0.1.0, current version 0.1.2)
Is there even a way to do this with qmake? I do know how to change this with the install_name_tool, but I would like to add it to the .pro file directly.
What I did so far:
I modified my pro file to change to rpath of the binary to include the path where the library is located at build-time:
otool -l Examples/SimpleExample/SimpleExample.app/Contents/MacOS/SimpleExample
Load command 22
cmd LC_RPATH
cmdsize 136
path /Users/sky/QtProjects/build-QSettingsDialog-Desktop_Qt_5_7_0_clang_64bit-Debug/Examples/SimpleExample/../../QSettingsDialog (offset 12)
Load command 23
cmd LC_RPATH
cmdsize 48
path /Users/sky/Qt/5.7/clang_64/lib (offset 12)
This way I can simply modify the rpath for a release without having to use the install_name_tool. However, for this to work, I need to change the first line to:
#rpath/QSettingsDialog.framework/Versions/0/QSettingsDialog (compatibility version 0.1.0, current version 0.1.2)
In my pro file for the application, i specified the following:
mac {
QMAKE_LFLAGS += -F$$OUT_PWD/../../QSettingsDialog/
QMAKE_LFLAGS += '-Wl,-rpath,\'$$OUT_PWD/../../QSettingsDialog\''
LIBS += -F$$OUT_PWD/../../QSettingsDialog/ -framework QSettingsDialog
}
The last missing piece is how to add the #rpath/. Thanks for your help.

Answer 1

Thanks to the links in the comment of #peppe, I was able to solve the problem:
I had to add
QMAKE_LFLAGS_SONAME = -Wl,-install_name,#rpath/
to the libraries pro file. This way Qt automatically uses #rpath/QSettingsDialog.framework/Versions/0/QSettingsDialog when creating the reference to the framework.