How to package and deploy libraries with Qt Creator

[il_bale]

Hello,

what is the correct way to package and deploy a library to N9 with Qt Creator? I have a project that produces a library and one that uses it, but when I compile the latter I get the following error:

dpkg-shlibdeps: failure: no dependency information found for /QtSDK/Madde/sysroots/harmattan_sysroot_10.2011.34-1_slim/usr/lib/libtestlib.so.1 (used by debian/testlibclient/opt/testlibclient/bin/testlibclient).
dh_shlibdeps: command returned error code 512
make: *** [binary-arch] Error 1
dpkg-buildpackage: failure: debian/rules binary gave error exit status 2
Packaging Error: Command '/QtSDK/Madde/bin/mad dpkg-buildpackage -nc -uc -us' failed.Exit code: 2
Error while building project testlibclient (target: Harmattan)
When executing build step 'Create Debian Package'

To reproduce the problem, create a new "C++ library" project in Qt creator (e.g. "testlib") and build it for harmattan target, then create a Qt Quick application project and add LIBS += -ltestlib to the project file. Building the second project will give the error above.

Note that I do have a "deploy to sysroot" step in my library project, and the library is correctly copied to the sysroot.

Many thanks in advance!

[gnuton]

It fails because your lib is not found in the predefined paths.
Please add LIBS += -L library_path

[il_bale]

Thanks, but if that was the case shouldn't the build fail at link time rather than package creation? As far as I can tell the library is installed in the sysroot and is found in the predefined paths.

[gnuton]

if that was the case shouldn't the build fail at link time rather than package creation?

Correct, since dpkg-shlibdeps often prints out error messages in the console and
dpkg-buildpackage: failure: debian/rules binary gave error exit status 2
is a very generic error message, I thought you had forgotten to paste the linker error messages.

As far as I can tell the library is installed in the sysroot and is found in the predefined paths.

I checked carefully the error message you got and the lib is in the correct path.

The package creation fails because dpkg-shlibdeps cannot found dependency info about your lib.
Your library should install a /var/lib/dpkg/info/package.shlibs.
To generate such file you need to uncomment dh_makeshlibs line in the debian/rules file of your lib.

[il_bale]

The package creation fails because dpkg-shlibdeps cannot found dependency info about your lib.
Your library should install a /var/lib/dpkg/info/package.shlibs.
To generate such file you need to uncomment dh_makeshlibs line in the debian/rules file of your lib.

Thanks. I did that, but now the packaging of the library fails with this error message:

dh_makeshlibs: /usr/share/debhelper/autoscripts/postinst-makeshlibs does not exist
make: *** [binary-arch] Error 1
dpkg-buildpackage: failure: debian/rules binary gave error exit status 2
Packaging Error: Command '/home/fbalestr/QtSDK/Madde/bin/mad dpkg-buildpackage -nc -uc -us' failed.Exit code: 2
Error while building project testlib (target: Harmattan)
When executing build step 'Create Debian Package'

[mck182]

I have the exact same issue. After "no dependency information found" I uncommented "dh_makeshlibs" and ended up with this error:

debian/rules build
Packaging Error: Command '/home/mck182/QtSDK/Madde/bin/mad dpkg-buildpackage -nc -uc -us' failed.Exit code: 2
Error while building project n9-barcode-reader (target: Harmattan)
When executing build step 'Create Debian Package'

il_bale, have you solved your problem?

Also, what is the best way to create and deploy an app for harmattan with a library?

[mikkovtr]

You should really show the real error message from "Compile Output" window. Anyway I did some tests and noticed that QT Creator forcefully runs dh_shlibdeps even if it commented out with '#'. I added another '#' and only after that dh_shlibdebs.

So try with

##	dh_shlibdeps

Sound weird because it is weird. I tested this with "Qt Widget Project" created with Qt Creator

[il_bale]

il_bale, have you solved your problem?

Unfortunately not yet.

[mck182]

You should really show the real error message from "Compile Output" window.

That's what I did. That's the whole error from "Compile output".

Anyway I made the lib install itself into /opt/usr/lib and then in the app .pro file I set

"QMAKE_RPATHDIR += /opt/usr/lib"

then commented out the dh_shlibdeps and now it works \o/

Thanks mikkovtr.

[mikkovtr]

That's what I did. That's the whole error from "Compile output".

Ah, sorry. I have much more verbose output. But great that it builds, hopefully package works on device too.

[mck182]

Yeah, it works For future reference - one can enable verbose output by uncommenting the line "export DH_VERBOSE=1" in rules file.