Something is adding a "-L/usr/local/lib" to the directfb test for cross compiling.

[KennethR]

Hi,

I'm trying to build an embedded Qt with this command,
./configure -platform linux-g++-64 -xplatform qws/linux-x86-intelce-g++ -embedded x86 -qt-gfx-directfb -v -opensource -confirm-license

I'm using Ubuntu 64 bit but building for intelce which is 32bit x86. The test for direc fb is failing because "-L/usr/local/lib" is being added to the makery for the test, and it's finding the 64 bit libpthread and failing.

my qmake.conf for the qws/linux-x86-intelce-g++ target is defining as
QT_LIBS_DIRECTFB = -L/usr/local/cross/staging/current/lib -L/usr/local/cross/staging/current/usr/lib -L/usr/local/cross/staging/current/usr/local/lib -ldirectfb -lfusion -ldirect -lpthread -Wl,-rpath-link,/usr/local/cross/staging/current/lib

The verbose and error output of configure is:
i686-cm-linux-g++ -m32 -L/usr/local/cross/staging/current/lib -L/usr/local/cross/staging/current/usr/lib -Wl,-rpath,/usr/local/Trolltech/QtEmbedded-4.7.1-i386/lib -o directfb directfb.o -L/usr/local/lib -L/usr/local/cross/staging/current/lib -L/usr/local/cross/staging/current/usr/lib -L/usr/local/cross/staging/current/usr/local/lib -ldirectfb -lfusion -ldirect -lpthread -Wl,-rpath-link,/usr/local/cross/staging/current/lib
/lib/libpthread.so.0: file not recognized: File format not recognized
collect2: ld returned 1 exit status
make: *** [directfb] Error 1
DirectFB disabled.
The DirectFB screen driver functionality test failed!

Any idea where the LIBDIR for /usr/local/lib is added and how I can remove it? I tried just removing it from the makefile, but the makefile is generated every time configure is run, I haven't been able to find out what it is being created from.

Thanks,
Ken R

[anselmolsm]

The linker error itself is:

@
/lib/libpthread.so.0: file not recognized: File format not recognized
@

The error happens because the linker is trying to use the wrong libpthread for cross compilation.

[KennethR]

@anselmolsm Any idea what I'm doing wrong that's causing it to use the wrong lib?

[anselmolsm]

@KennethR, do you have a libpthread built for the target platform? It seems it is not in any of the directories informed to the linker with -L, so it tries to find in the default paths (e.g. /lib). Check that, your cross compilation environment probably has this library.

[KennethR]

I did have a libpthread built for the target, I was able to get Qt to build correctly by adding a --sysroot=/usr/local/cross/staging/current to the QT_LIBS_DIRECTFB variable in my qmake.conf.