Compiling QT libs with non-default gcc

zvivered

Dear members,

I downloaded and extracted qt-everywhere-opensource-src-4.8.3.tar.gz.
Using configure (or another way) I want to compile the QTlibs with another gcc located in /opt
This is not the default gcc that comes with Centos (5.5)

Can you help ?

Thanks,
Zvika

sierdzio

Adjust mkspecs (or better, create your own by copying, say, linux-g++), so that it uses a different compiler. Then you need to configure Qt with -platform <your new mkspecs>. I don't actually remember if it works, but at least is worth a try.

tobias.hunger

If your gcc in /opt is called "gcc", "g++" etc. then you can just make sure /opt/whatever/bin is in your PATH before /usr/bin and this should work. Run "gcc --version" (or was that "gcc -v", can't remember :) and check that you get the expected version number back to make sure the right compiler is picked up.

I would also check the generated Makefiles before building for the first time. Some mkspec put the absolute path to the compiler into those and will thus ignore your PATH setup.

zvivered

Dear Members,

I created a new folder under mkspecs copied from linux-g++-32
Then I changed g++,gcc to i686-nptl-linux-gnu-gcc,i686-nptl-linux-gnu-g++
I also set:
QMAKE_LIBDIR =
QMAKE_INCDIR_X11 =
QMAKE_LIBDIR_X11 =

I ran:
./configure -opensource -platform i686-nptl-linux-gnu -embedded -host-little-endian -fast -no-accessibility -no-stl -no-qt3support -no-xmlpatterns -no-multimedia -no-audio-backend -no-phonon -no-phonon-backend -no-svg -no-webkit -no-javascript-jit -no-script -no-declarative -no-declarative-debug -no-gif -qt-zlib -no-libtiff -no-libpng -no-libmng -no-libjpeg -no-openssl -no-gui -no-nis -no-cups -no-iconv -no-dbus -no-gtkstyle -no-nas-sound -no-opengl -no-openvg -no-sm -no-xshape -no-xvideo -no-xsync -no-xinerama -no-xcursor -no-xfixes -no-xrandr -no-xrender -no-mitshm -no-fontconfig -no-xinput -no-xkb -no-glib

After a while I got the following error:

gmake[1]: Entering directory /home/zvivered/qt-everywhere-opensource-src-4.7.4/translations' /home/zvivered/qt-everywhere-opensource-src-4.7.4/bin/qmake -spec ../mkspecs/qws/linux-x86-g++ -o Makefile translations.pro gmake[1]: Leaving directory /home/zvivered/qt-everywhere-opensource-src-4.7.4/translations'
gmake[1]: Entering directory /home/zvivered/qt-everywhere-opensource-src-4.7.4/translations' /home/zvivered/qt-everywhere-opensource-src-4.7.4/bin/lrelease assistant_cs.ts -qm assistant_cs.qm /home/zvivered/qt-everywhere-opensource-src-4.7.4/bin/lrelease: /usr/lib/libstdc++.so.6: version GLIBCXX_3.4.9' not found (required by /home/zvivered/qt-everywhere-opensource-src-4.7.4/bin/lrelease)
gmake[1]: *** [assistant_cs.qm] Error 1
gmake[1]: Leaving directory `/home/zvivered/qt-everywhere-opensource-src-4.7.4/translations'
gmake: *** [sub-translations-make_default-ordered] Error 2
[

Why does the make files searches: /usr/lib/libstdc++.so.6 ?
In my directory under mkspec (called i686-nptl-linux-gnu) there is no: /usr/lib

You help is highly appreciated !
Thanks,
Zvika

zvivered

Dear Members,

I think I had to set:
LD_LIBRARY_PATH to point to where my gcc's dynamic libraries are located.

Now I'm getting:
/home/zvivered/ct-ng-1.5.2/release/i686-nptl-linux-gnu/sys-root/lib/librt.so.1: undefined reference to `__fortify_fail@GLIBC_PRIVATE'
collect2: ld returned 1 exit status
gmake[3]: *** [download] Error 1

"My" glibc is 2.9
Can I link QT 4.7.4 with this glibc ?

Thanks,
Zvika

zvivered

Hello,

I created a toolchain with glib 2.5
With this glib I did not get the unresolved error: "undefined reference to `__fortify_fail@GLIBC_PRIVATE’"

Upon configure start I got the following message:
@You have not explicitly asked to use pkg-config and are cross-compiling.
pkg-config will not be used to automatically query cflag/lib parameters for
dependencies@

Where should I usg pkg-config ?

Thanks,
Zvika