Qt cross-compilation issue

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1

Hi everyone,

I have a big problem with Qt libraries cross-compilation. My objective is to develop some Qt-apps for my BeagleBoard-xM on my host machine running Ubuntu 12.04 LTS. I found some nice tutorials, e.g.:

http://treyweaver.blogspot.com/2010/10/setting-up-qt-development-environment.html

but the toolchain, which Trey used (angstrom-2010.4-test-20100422-i686-linux-armv7a-linux-gnueabi-toolchain-qte-4.6.2), it just disappeared, so I tried some toolchains from Ubuntu repository (gcc-arm-linux-gnueabi, gcc-arm-linux-gnueabihf). And now, when I run ‘configure’ (with all parameters from Trey’s tutorial) and then try to run ‘make’, it breaks with this error:

/usr/lib/gcc/arm-linux-gnueabi/4.6/../../../../arm-linux-gnueabi/lib/../lib/crt1.o: In function_start’:
(.text+0x30): undefined reference to `main’
collect2: ld returned 1 exit status
make[1]: *** […/…/lib/libQtCoreE.so.4.8.5] Error 1

`

I found somewhere, that it might be some linking issue, but I have completely no idea, what to do with that…

Maybe someone has similar problem and could give me some advice?

Regards
jerzu

2

Did you adapt the qmake.conf to the location of your compiler and linker?
In the output you posted I can’t find any linker command.

3

Thanks for the answer!

Yes, I have edited ‘qmake.conf’ file just like Trey described in his tutorial. Everything looks correct for me, but maybe you will find some mistake… Here is my current version of ‘qmake.conf’:

qmake configuration for building with arm-linux-g++

include(…/…/common/g+±unix.conf)
include(…/…/common/linux.conf)
include(…/…/common/qws.conf)

modifications to g++.conf

Toolchain

#Compiler Flags to take advantage of the ARM architecture
QMAKE_CFLAGS_RELEASE = -O3 -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mfloat-abi=softfp
QMAKE_CXXFLAGS_RELEASE = -O3 -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mfloat-abi=softfp

QMAKE_CC = /usr/bin/arm-linux-gnueabi-gcc
QMAKE_CXX = /usr/bin/arm-linux-gnueabi-g++
QMAKE_LINK = /usr/bin/arm-linux-gnueabi-g++
QMAKE_LINK_SHLIB = /usr/bin/arm-linux-gnueabi-g++

modifications to linux.conf

QMAKE_AR = /usr/bin/arm-linux-gnueabi-ar cqs
QMAKE_OBJCOPY = /usr/bin/arm-linux-gnueabi-objcopy
QMAKE_STRIP = /usr/bin/arm-linux-gnueabi-strip

load(qt_config)

I replaced ‘g++.conf’ with ‘g+±unix.conf’. All the paths are correct.

4

Can you post the whole output of the make command?

5

I made ‘configure’ report too, so here is ‘configure’ output:

http://shrib.com/q28bxrfb

…and ‘make’ output:

http://shrib.com/NN6TUZKR

I have some warnings in ‘configure’, but I suppose that it’s not a reason of compilation fail.

6

Can you try to do a “make clean” and then a “make” again?

7

I did ‘make confclean’ and ‘make clean’, then I try to ‘configure’ and ‘make’ again, but it ends exactly in the same way… Here are both outputs:

  1. configure:

http://shrib.com/1IbUjLe3

  1. make:

http://shrib.com/oTn2WtrY

8

Wait, it looks like the outputs I have posted above are not complete… They are too big for shrib :wink: I’ll try to attach the text files here.

ConfigReport.txt (104 KB)

MakeReport.txt (265 KB)

9

And now something new about arm-linux-gnueabihf toolchain - when I’m using it, I get some extra errors:

/usr/lib/gcc/arm-linux-gnueabihf/4.6/../../../../arm-linux-gnueabihf/lib/../lib/crt1.o: In function_start’:
(.text+0x30): undefined reference to main' .obj/release-shared-emb-arm/qtconcurrentiteratekernel.o: In function QtConcurrent::BlockSizeManager::timeBeforeUser()’:
qtconcurrentiteratekernel.cpp:(.text+0x14a): undefined reference to clock_gettime' .obj/release-shared-emb-arm/qtconcurrentiteratekernel.o: In function QtConcurrent::BlockSizeManager::timeAfterUser()’:
qtconcurrentiteratekernel.cpp:(.text+0x260): undefined reference to `clock_gettime’
collect2: ld returned 1 exit status
make[1]: *** […/…/lib/libQtCoreE.so.4.8.5] Error 1

`

Any ideas…?

Is there anyone here who has succesful compiled Qt-libs with OTHER ARM-linux-toolchain than angstrom-linux-toolchain…?

Or maybe someone has got 32-bit angstrom-linux-toolchain (for Qt) and can just send me it?

10

I shared my compiler, qt-Source and conf file.
Perhaps this will help.

11

Thank you very much, Tux! I downloaded your files and so far compilation runs quite well, no errors at the moment :wink: Thank you once more for your help, I hope that I will be finally able to make something more on my Beagle :wink:

It looks like my problem was this part of ‘qmake.conf’:

#Compiler Flags to take advantage of the ARM architecture
QMAKE_CFLAGS_RELEASE = -O3 -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mfloat-abi=softfp
QMAKE_CXXFLAGS_RELEASE = -O3 -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mfloat-abi=softfp

because only when I’ve deleted these statements from it, the ‘make’ command started to work well. I see, that there are some floating point unit parameters (‘neon’, ‘mfloat-abi’), so it may be the reason that FPU (thus some graphic apps too) will be much slower… Am I right?