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How to make an application use local shared library instead of the system one

rated 0 times [ 0] [ 0] / answers: 1 / hits: 4413 / 2 Years ago, tue, april 26, 2022, 6:40:19

I have qtcreator installed using the qt online installer. It ships which its own version of qt library. The qt library are also installed in the system directories, but those are older.
I have problems with qtcreator (see qt-forums). Suspecting this might be because Qt is using the old system libraries, I ran qt using

strace -e open qtcreator.sh

and indeed, it uses the libraries in /usr/lib/x86_64-linux-gnu/qtcreator/

To load the correct libaries, the qrcreator.sh script sets LD_LIBRARY_PATH to

/home/<me>/Qt/Tools/QtCreator/lib:/home/<me>/Qt/Tools/QtCreator/lib/qtcreator

this is correct, but still, the libraries from /usr/lib/x86_64-linux-gnu/qtcreator are used.

How can I tell qtcreator to use the local libraries despite the existence of the system wide libraries?

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2 Years ago

answered 2 Years ago epypian · Accepted Answer

To Nathan's option, I would add patchelf which allows to change the RPATH of an executable. I personally prefer patching RPATH over defining LD_LIBRARY_PATH and the like, since Ubuntu has issue defining these in profile and also as if not defining this in profile, this save the need of a wrapper script.

To define an executable RPATH which is relative to the application's directory (if you wish to, that's not mandatory to do so), you have to use $ORIGIN taking care to escape the $ which must appears literally (so use $ORIGIN if you invoke patchelf from a shell). Ex. if the application belongs a bin directory and the libraries belongs to a peer lib directory, you will use $ORIGIN/../lib for the RPATH.

You may as well use an absolute RPATH if you prefer.

See Patchelf (nixos.org).