[Interest] Cross compile QT5.5 for ARM

[Jan Imrich]

Hello, I managed to successfuly compile Qt 5.5 for raspberry pi 2, but I
need to compile it with GStreamer 1 and webkit support.
I cant use GStreamer 0.1 because of incompatibility of webkit using 1.0 and
qtmultimedia using 0.1... so when I instantiate both of these modules, it
crashes...

I have SDcard with raspbian mounted in /mnt/rasp-pi-rootfs.

If I run configure like this,

./configure -gstreamer 1.0 -v -opengl es2 -device linux-rasp-pi-g++
-device-option \
CROSS_COMPILE=/home/imrija/qtpi/gcc-4.7-linaro-rpi-gnueabihf/bin/arm-linux-gnueabihf-
-sysroot /mnt/rasp-pi-rootfs  \
-opensource -confirm-license -optimized-qmake -reduce-exports -release -icu
-make libs -prefix /usr/local/qt5pi \

it prints error about lphtread.

so I tried to pass -lpthread parameter, it printed similar error, so I
repeated this proccess for -lrt...
now my configure looks like this:

./configure -lpthread -lrt -gstreamer 1.0 -v -opengl es2 -device
linux-rasp-pi-g++ \
-device-option
CROSS_COMPILE=/home/imrija/qtpi/gcc-4.7-linaro-rpi-gnueabihf/bin/arm-linux-gnueabihf-
\
-sysroot /mnt/rasp-pi-rootfs -opensource -confirm-license -optimized-qmake
-reduce-exports -release -icu -make libs -prefix /usr/local/qt5pi


now it prints the same error for libpcre:

---------

GStreamer 1.0 auto-detection... ()
/home/imrija/qtpi/gcc-4.7-linaro-rpi-gnueabihf/bin/arm-linux-gnueabihf-g++
-c -pipe -marm -mfpu=vfp -mtune=arm1176jzf-s -march=armv6zk
-mabi=aapcs-linux -mfloat-abi=hard --sysroot=/mnt/rasp-pi-rootfs -O2
-pthread -pthread -pthread -pthread -pthread -Wall -W -fPIC  -I.
-I/mnt/rasp-pi-rootfs/usr/include/gstreamer-1.0
-I/mnt/rasp-pi-rootfs/usr/include/glib-2.0
-I/mnt/rasp-pi-rootfs/usr/lib/arm-linux-gnueabihf/glib-2.0/include
-I../../../mkspecs/devices/linux-rasp-pi-g++ -o gstreamer.o gstreamer.cpp
/home/imrija/qtpi/gcc-4.7-linaro-rpi-gnueabihf/bin/arm-linux-gnueabihf-g++
-Wl,-rpath-link,/mnt/rasp-pi-rootfs/opt/vc/lib
-Wl,-rpath-link,/mnt/rasp-pi-rootfs/usr/lib/arm-linux-gnueabihf
-Wl,-rpath-link,/mnt/rasp-pi-rootfs/lib/arm-linux-gnueabihf
-mfloat-abi=hard -Wl,-O1 -o gstreamer gstreamer.o
--sysroot=/mnt/rasp-pi-rootfs -lpthread -lrt
-L/mnt/rasp-pi-rootfs/usr/lib/arm-linux-gnueabihf -lgstaudio-1.0
-lgstvideo-1.0 -lgstbase-1.0 -lgstpbutils-1.0 -lgstreamer-1.0 -lgobject-2.0
-lglib-2.0
/home/imrija/qtpi/gcc-4.7-linaro-rpi-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/4.7.2/../../../../arm-linux-gnueabihf/bin/ld:
/mnt/rasp-pi-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o):
undefined reference to symbol 'pcre_study'
/home/imrija/qtpi/gcc-4.7-linaro-rpi-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/4.7.2/../../../../arm-linux-gnueabihf/bin/ld:
note: 'pcre_study' is defined in DSO
/mnt/rasp-pi-rootfs/lib/arm-linux-gnueabihf/libpcre.so.3 so try adding it
to the linker command line
/mnt/rasp-pi-rootfs/lib/arm-linux-gnueabihf/libpcre.so.3: could not read
symbols: Invalid operation
collect2: error: ld returned 1 exit status
Makefile:109: návod pro cíl „gstreamer“ selhal
make: *** [gstreamer] Chyba 1
GStreamer 1.0 disabled.
The GStreamer 1.0 functionality test failed!
 Turn on verbose messaging (-v) to ./configure to see the final report.

----------

but when I try adding -lpcre it fails the same....
I tried also -no-pcre, -qt-pcre and -system-pcre parameters, but no success.


What am I doing wrong ? Thanks, Jan Imrich.
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