[yocto] 1.7 - QtCreator ERROR while linking- /usr/bin/ld:cannot find /lib/libpthread.so.0 inside

[Simon Bolek]

yo!

I kind of solved the problem last night. At least i can deploy and run the
app in qemu/device.
*@Martin*: sorry again for direct mail, but i am not sure if my solution is
THE solution. Maybe i
just managed to find a workaround of sth, that can be solved someway else,
OR i just have my settings wrong.

As i already mentioned, linker was not the yocto-qt-sdk linker, but my
ubuntu one. Even though LD variable had been set correctly. I just assume
LD is for the linker, I have no idea if this LD should be used for linking.
So I did copy the i586-poky-linux-ld:
*cp i586-poky-linux-ld ld*
and look there, QtCreator suddenly used this ld for linking. This did not
solve the problem of looking for the libraries in /lib/ or /usr/lib of my
ubuntu machine. Even though *OE_QMAKE_LIBDIR_QT* set to:
*/opt/poky/1.7/sysroots/i586-poky-linux/usr/lib:/opt/poky/1.7/sysroots/i586-poky-linux/lib*

Not even the adding of sysroot to $LD or to $LDFLAGS or to
$OE_QMAKE_LDFLAGS or to $OE_QMAKE_CFLAGS helped:
*--sysroot=/opt/poky/1.7/sysroots/i586-poky-linux*

First setting *QMAKE_LFLAGS* manually in .pro like this:

*QMAKE_LFLAGS=--sysroot=/opt/poky/1.7/sysroots/i586-poky-linux*
caused the linker to look for the libraries. I will set this variable up in
qt5.sh of sdk later.

So, are those OE_QMAKE* variables used in some way? Where can i see them
beeing used. And is this really the solution of the problem? I can't help
the feeling that setting all those --sysroot in setup scripts (source
oe..., and qt5.sh) when starting QtCreator is wrong/not having any function.

*BTW:* I had to update QtCreator to 3.3.0, because deploying the
application with 3.2.0 to qemu(core-image-sato) caused ssh problem of
different protocols (qt hat the old one, not matching the new one in
openssh library of yocto 1.7).

cheers
simon :-)

Date: Fri, 30 Jan 2015 16:59:31 +0100
> From: Simon Bolek <simon.bolek at googlemail.com>
> To: yocto at yoctoproject.org
> Subject: [yocto] 1.7 - QtCreator ERROR while linking- /usr/bin/ld:
>         cannot find /lib/libpthread.so.0 inside
> Message-ID:
>         <CAEfap_BwbJG8SZ_btNZAAKouS=JAWByJxkMB95n52qV7C=
> 0PqQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> hello!
>
> So after successfully bitbaking and installing meta-toolchain-st5 I set up
> QtCreator 3.2.2 and tried to compile an app against SDK of qt5. However I
> get an error:
>
> /usr/bin/ld: cannot find /lib/libpthread.so.0 inside
> /usr/bin/ld: cannot find /usr/lib/libpthread_nonshared.a inside
>
> libpthread.so is available alright, but the linker is not finding it
> somehow.
>
> LD variable is set to:
> i586-poky-linux-ld --sysroot=/opt/poky/1.7/sysroots/i586-poky-linux
>
> Maybe this is a pure QtCreator bug, but where would I set(override) the
> linker correctly? Any suggestions?
>
> If i run(from console ):
> i586-poky-linux-ld --sysroot=/opt/poky/1.7/sysroots/i586-poky-linux
> /opt/poky/1.7/sysroots/i586-poky-linux/usr/lib/libpthread.so
> it is fine(it gives me some warning, but no errors).
>
> Here are the QtCreator settings for Qt5 Kit:
> GCC Compiler:
> path:
>
> /opt/poky/1.7/sysroots/i686-pokysdk-linux/usr/bin/i586-poky-linux/i586-poky-linux-gcc
>
> Qt Version:
> qmake location: /opt/poky/1.7/sysroots/i686-pokysdk-linux/usr/bin/qt5/qmake
>
> Qt Kit:
> sysroot: /opt/poky/1.7/sysroots/i586-poky-linux
> compiler: set to above gcc compiler
> qt version: set to above qt version
>
> even manually setting LIBS to
> LIBS += -L//opt/poky/1.7/sysroots/i586-poky-linux/lib
> or
> LIBS += -L//opt/poky/1.7/sysroots/i586-poky-linux/usr/lib
> does not help(but i really do not think this is the problem).
>
> So you have any hints for me?
> I compared the settings of 1.6.1, and there is no difference as far as my
> eye can catch.
>
>
> PS. I switched from 1.6.1 to 1.7, becasue of gclib not beeing available in
> 1.6.1.
>
> cheers
> simon :-)
>
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