Compiling Qt Embedded for Mips

fralik

Hi all! I am trying to compile Qt Embedded for Mips (mipsel) architecture. I want to use my software on my router, which has DD-WRT. So, I downloaded the toolchain for DD-WRT, made simple Helloworld program and test it on my router. It works. Then I downloaded latest Qt Embedded archive and run:
@
./configure -no-cups -release -shared -no-qt3support -no-phonon -no-audio-backend -no-webkit -qt-sql-lite -no-script -no-scripttools -opensource -no-gui -nomake examples -nomake demos

./configure -no-cups -release -shared -no-qt3support -no-phonon -no-audio-backend -no-webkit -qt-sql-sqlite -no-script -no-scripttools -platform linux-g++-64 -xplatform qws/linux-mipsel-g++ -opensource -no-gui -embedded mips -little-endian -nomake examples -nomake demos
@ Configuration is successful. Then I execute make and get this error:
@.obj/release-shared-emb-mips/qrect.o: In function QRectF::toAlignedRect() const': qrect.cpp:(.text+0x1468): undefined reference to ceilf'@
There are two things:

Toolchain from DD-WRT uses uclibc library, which does not contain ceilf function.

Qt uses ceilf function if QT_USE_MATH_H_FLOATS is defined, otherwise it should use ceil function.

Since recompilation of uclibc is not really suitable, I tried to work with Qt. I do not define QT_USE_MATH_H_FLOATS and I removed everything what has QT_USE_MATH_H_FLOATS from qmath.h. Of course, I did a lot of make confclean and make clean. Still, the error is there. Maybe someone has a clue on this? It is not clear for me how ceilf can appear in object file, and how
@
int xmax = int( int(ceil(xp + w)) );
@ results in a call of ceilf.

My linux-mipsel-g++/qmake.conf file is:
@
include(../../common/g++.conf)
include(../../common/linux.conf)
include(../../common/qws.conf)

modifications to g++.conf

QMAKE_CC = mipsel-linux-gcc
QMAKE_CXX = mipsel-linux-g++
QMAKE_CFLAGS += -mips32
QMAKE_CXXFLAGS += -mips32
QMAKE_LINK = mipsel-linux-g++
QMAKE_LINK_SHLIB = mipsel-linux-g++
QMAKE_INCDIR = /home/fralik/toolchain-mipsel_gcc4.1.2/include
QMAKE_LIDDIR = /home/fralik/toolchain-mipsel_gcc4.1.2/lib

modifications to linux.conf

QMAKE_AR = mipsel-linux-ar cqs
QMAKE_OBJCOPY = mipsel-linux-objcopy
QMAKE_STRIP = mipsel-linux-strip

load(qt_config)
@

tobias.hunger

fralik: This has nothing to do with your question, but could you please send me the libQtCore.so file as well as the output you get when running your mips compiler with the option -dumpmachine? Once you made sure everything works that is...

I would love to improve mips support in Qt Creator, but so far have not found the time to actually set up and test a toolchain:-) The information I requested would greatly help me with that goal. You should be able to contact me via the "send mail" button in my profile. Thanks!

fralik

I ended up replacing calls of

@qCeil(xp+y)@

by

@(float)((int)xp + y)@

[EDIT: code formatting, Volker]

robert.berger

Hi Tobias,

You might want to have a look at http://www.yoctoproject.org/
This will build a boot loader, toolchain, kernel, rootfs for you and it also contains qt4-x11-free and qt4-embedded.

If you don't want to build the stuff yourself, you can download pre compiled stuff.

Regards,

Robert