When I configure Qt 5.6, it shows that xcb failed! Why?

small_bird

When I configured Qt 5.6 source code using Ubuntu 12.04 lts, I came across this problem:
"xcb auto-detection... ()
arm-linux-g++ -lts -c -pipe -O2 -Wall -W -fPIC -I. -I../../../mkspecs/linux-arm-gnueabi-g++ -o xcb.o xcb.cpp
xcb.cpp:34: fatal error: xcb/xcb.h: No such file or directory
compilation terminated.
make: *** [xcb.o] Error 1
xcb disabled.
The test for linking against libxcb failed!
You might need to install dependency packages for libxcb.
See src/plugins/platforms/xcb/README.
"
However, the packages are all installed. Could anyone help me? Thanks in advance!

SGaist

Hi,

Are they installed for your target ?

small_bird

@SGaist Yes, I cross compile qt5.6 source code for my arm board.

jsulm

@small_bird Are you really sure xcb is installed for your target (not for Ubuntu host machine)?
This error tells you that xcb header file could not be found, so at least the xcb-dev package is not installed:

xcb.cpp:34: fatal error: xcb/xcb.h: No such file or directory

small_bird

@jsulm Yes the xcb is installed for my target.
verywhere-opensource-src-5.6.0# dpkg -l|grep xcb
2:1.6.3-1ubuntu2 Xlib/XCB interface library (development headers)
2:1.6.3-1ubuntu2 Xlib/XCB interface library
2:1.6.3-1ubuntu2 Xlib/XCB interface library (debug package)
1.11.1-1ubuntu1 X C Binding, composite extension
1.11.1-1ubuntu1 X C Binding, composite extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, composite extension, development files
0.1.1-3ubuntu1 utility libraries for X C Binding -- cursor, development files
0.1.1-3ubuntu1 utility libraries for X C Binding -- cursor
1.11.1-1ubuntu1 X C Binding, damage extension
1.11.1-1ubuntu1 X C Binding, damage extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, damage extension, development files
1.11.1-1ubuntu1 X C Binding, development documentation
1.11.1-1ubuntu1 X C Binding, dpms extension
1.11.1-1ubuntu1 X C Binding, dpms extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, dpms extension, development files
1.11.1-1ubuntu1 X C Binding, dri2 extension
1.11.1-1ubuntu1 X C Binding, dri2 extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, dri2 extension, development files
1.11.1-1ubuntu1 X C Binding, dri3 extension
1.11.1-1ubuntu1 X C Binding, dri3 extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, dri3 extension, development files
0.4.1-1ubuntu1 utility libraries for X C Binding -- ewmh, development files
0.3.8-1build1 utility libraries for X C Binding -- ewmh
0.4.1-1ubuntu1 utility libraries for X C Binding -- ewmh
1.11.1-1ubuntu1 X C Binding, glx extension
1.11.1-1ubuntu1 X C Binding, glx extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, glx extension, development files
0.4.1-1ubuntu1 utility libraries for X C Binding -- icccm
0.4.1-1ubuntu1 utility libraries for X C Binding -- icccm, development files
0.4.0-1build1 utility libraries for X C Binding -- image
0.4.0-1build1 utility libraries for X C Binding -- image, development files
0.4.0-1 utility libraries for X C Binding -- keysyms
0.4.0-1 utility libraries for X C Binding -- keysyms, development files
1.11.1-1ubuntu1 X C Binding, present extension, development files
1.11.1-1ubuntu1 X C Binding, present extension
1.11.1-1ubuntu1 X C Binding, present extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, randr extension
1.11.1-1ubuntu1 X C Binding, randr extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, randr extension, development files
1.11.1-1ubuntu1 X C Binding, record extension
1.11.1-1ubuntu1 X C Binding, record extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, record extension, development files
0.3.9-1 utility libraries for X C Binding -- render-util
0.3.9-1 utility libraries for X C Binding -- render-util
1.11.1-1ubuntu1 X C Binding, render extension
1.11.1-1ubuntu1 X C Binding, render extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, render extension, development files
1.11.1-1ubuntu1 X C Binding, res extension
1.11.1-1ubuntu1 X C Binding, res extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, res extension, development files
1.11.1-1ubuntu1 X C Binding, screensaver extension
1.11.1-1ubuntu1 X C Binding, screensaver extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, screensaver extension, development files
1.11.1-1ubuntu1 X C Binding, shape extension
1.11.1-1ubuntu1 X C Binding, shape extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, shape extension, development files
1.11.1-1ubuntu1 X C Binding, shm extension
1.11.1-1ubuntu1 X C Binding, shm extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, shm extension, development files
1.11.1-1ubuntu1 X C Binding, sync extension, development files
1.8.1-1ubuntu0.2 X C Binding, sync extension
1.8.1-1ubuntu0.2 X C Binding, sync extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, sync extension
1.11.1-1ubuntu1 X C Binding, sync extension, debugging symbols
0.4.0-0ubuntu3 utility libraries for X C Binding -- atom, aux and event
0.3.8-2 utility libraries for X C Binding -- atom, aux and event
0.4.0-0ubuntu3 dummy transitional package for utility libraries for X C Binding -- atom, aux and event
0.4.0-0ubuntu3 utility libraries for X C Binding -- atom, aux and event
1.11.1-1ubuntu1 X C Binding, xevie extension
1.11.1-1ubuntu1 X C Binding, xevie extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, xevie extension, development files
1.11.1-1ubuntu1 X C Binding, xf86dri extension
1.11.1-1ubuntu1 X C Binding, xf86dri extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, xf86dri extension, development files
1.11.1-1ubuntu1 X C Binding, xfixes extension
1.11.1-1ubuntu1 X C Binding, xfixes extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, xfixes extension, development files
1.11.1-1ubuntu1 X C Binding, xinerama extension
1.11.1-1ubuntu1 X C Binding, xinerama extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, xinerama extension, development files
1.11.1-1ubuntu1 X C Binding, XKEYBOARD extension, development files
1.11.1-1ubuntu1 X C Binding, XKEYBOARD extension
1.11.1-1ubuntu1 X C Binding, XKEYBOARD extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, xprint extension
1.11.1-1ubuntu1 X C Binding, xprint extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, xprint extension, development files
1.11.1-1ubuntu1 X C Binding, xtest extension
1.11.1-1ubuntu1 X C Binding, xtest extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, xtest extension, development files
1.11.1-1ubuntu1 X C Binding, xv extension
1.11.1-1ubuntu1 X C Binding, xv extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, xv extension, development files
1.11.1-1ubuntu1 X C Binding, xvmc extension
1.11.1-1ubuntu1 X C Binding, xvmc extension, debugging symbols
1.11.1-1ubuntu1 X C Binding, xvmc extension, development files
1.11.1-1ubuntu1 X C Binding
1.11.1-1ubuntu1 X C Binding, debugging symbols
1.11.1-1ubuntu1 X C Binding, development files
2.4-4.1 Pigeon holes for your cut and paste selections
I have installed all packages.

jsulm

@small_bird As I already said you need to install it on your target device/sysroot not your Ubuntu machine!
You're cross-compiling, right? That means you need libs/headers for your target platform.

jsulm

@small_bird "root@ubuntu:/opt/qt-everywhere-opensource-src-5.6.0# dpkg -l|grep xcb" - so you're on your Ubuntu host machine, right? Why are you logged on as root? You never should work as root! Put Qt source-code somewhere in your home directory instead of /opt then you don't need root to build. /opt is quite unusual location for source code.

small_bird

@jsulm Hi, now I change my home directory to /home/smallbird("smallbird" is my user name), but I get the following result:
xcb auto-detection... ()
g++ -c -pipe -O2 -Wall -W -fPIC -I. -I/home/smallbird/tslib1.4/include -I/home/smallbird/GLES2 -I../../../mkspecs/linux-arm-gnueabi-g++ -o xcb.o xcb.cpp
xcb.cpp: In function ‘int main(int, char**)’:
xcb.cpp:39:23: warning: unused variable ‘t’ [-Wunused-variable]
xcb_connection_t *t = xcb_connect("", &primaryScreen);
^
arm-linux-g++ -Wl,-O1 -o xcb xcb.o -L/home/smallbird/openglES2libs-x86 -lGLESv2 -lts -lrt -lpthread -L/home/smallbird/tslib1.4/lib -lxcb
/home/smallbird/arm-2009q3/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.1/../../../../arm-none-linux-gnueabi/bin/ld: xcb.o: Relocations in generic ELF (EM: 3)
/home/smallbird/arm-2009q3/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.1/../../../../arm-none-linux-gnueabi/bin/ld: xcb.o: Relocations in generic ELF (EM: 3)
xcb.o: could not read symbols: File in wrong format
collect2: ld returned 1 exit status
Makefile:84: recipe for target 'xcb' failed
make: *** [xcb] Error 1
xcb disabled.
The test for linking against libxcb failed!
You might need to install dependency packages for libxcb.
See src/plugins/platforms/xcb/README.

Could you help me? Thanks in advance!

jsulm

@small_bird Now you're using your host PC g++ compiler instead of the cross-compiler (arm-linux-g++). You used the correct compiler before, why do you use the wrong compiler now?
Now:

xcb auto-detection... ()
g++ -c -pipe -O2 -Wall -W -fPIC -I. -I/home/smallbird/tslib1.4/include -I/home/smallbird/GLES2 -I../../../mkspecs/linux-arm-gnueabi-g++ -o xcb.o xcb.cpp

before

xcb auto-detection... ()
arm-linux-g++ -lts -c -pipe -O2 -Wall -W -fPIC -I. -I../../../mkspecs/linux-arm-gnueabi-g++ -o xcb.o xcb.cpp

small_bird

@jsulm No ,It is arm-linux-g++.

As this line shows:
arm-linux-g++ -Wl,-O1 -o xcb xcb.o -L/home/smallbird/openglES2libs-x86 -lGLESv2 -lts -lrt -lpthread -L/home/smallbird/tslib1.4/lib -lxcb

Am I right?

jsulm

@small_bird You're using wrong compiler to compile but the cross-compiler to link. I updated my previous post.

small_bird

@jsulm OK, I have saw that. I'd check my parameter.

small_bird

@jsulm It is quite strange, I have the qmake.conf like this:

modifications to g++.conf

QMAKE_CC = arm-linux-gcc -lts
QMAKE_LINK = arm-linux-g++ -lts
QMAKE_LINK_SHLIB = arm-linux-g++ -lts

modifications to linux.conf

QMAKE_AR = arm-linux-ar cqs
QMAKE_OBJCOPY = arm-linux-objcopy
QMAKE_NM = arm-linux-nm -P
QMAKE_STRIP = arm-linux-strip

You see that? I have already set the paremeter.

small_bird

@jsulm Ok, now I have solved the problem. I added one line to the qmake.conf file, now the file is like this:

Now:

modifications to g++.conf

QMAKE_CC = arm-linux-gcc -lts
QMAKE_CXX = arm-linux-g++ -lts
QMAKE_LINK = arm-linux-g++ -lts
QMAKE_LINK_SHLIB = arm-linux-g++ -lts

modifications to linux.conf

QMAKE_AR = arm-linux-ar cqs
QMAKE_OBJCOPY = arm-linux-objcopy
QMAKE_NM = arm-linux-nm -P
QMAKE_STRIP = arm-linux-strip

Before:

modifications to g++.conf

QMAKE_CC = arm-linux-gcc -lts
QMAKE_LINK = arm-linux-g++ -lts
QMAKE_LINK_SHLIB = arm-linux-g++ -lts

modifications to linux.conf

QMAKE_AR = arm-linux-ar cqs
QMAKE_OBJCOPY = arm-linux-objcopy
QMAKE_NM = arm-linux-nm -P
QMAKE_STRIP = arm-linux-strip
load(qt_config)

However, I got the following result:

xcb auto-detection... ()
arm-linux-g++ -lts -c -pipe -O2 -Wall -W -fPIC -I. -I/home/smallbird/tslib1.4/include -I../../../mkspecs/linux-arm-gnueabi-g++ -o xcb.o xcb.cpp
xcb.cpp:34: fatal error: xcb/xcb.h: No such file or directory
compilation terminated.
Makefile:172: recipe for target 'xcb.o' failed
make: *** [xcb.o] Error 1
xcb disabled.
The test for linking against libxcb failed!
You might need to install dependency packages for libxcb.
See src/plugins/platforms/xcb/README.

Why？The packages are all installed.

jsulm

@small_bird said in When I configure qt5.6, it shows that xcb failed! Why?:

xcb/xcb.h

Is xcb/xcb.h there? And if so where exactly is it?

small_bird

@jsulm Yes, it is there.
It is located in /home/smallbird/qt-everywhere-opensource-src-5.6.0/qtbase/src/3rdparty/xcb/sysinclude.

SGaist

If you are using Qt's 3rdparty xcb, you should say so in the configure options.

small_bird

@SGaist Yes, I have added -qt-xcb option, my configure is as following:
#!/bin/sh
./configure
-v
-prefix /home/smallbird/qt5.6.0
-release
-continue
-confirm-license
-plugin-sql-sqlite
-qt-libjpeg
-qt-libpng
-qt-zlib
-no-c++11
-qt-xcb
-opensource
-xplatform linux-arm-gnueabi-g++
-force-pkg-config
-make examples
-no-dbus
-pkg-config
-qt-freetype
-qt-pcre
-I/home/smallbird/tslib1.4/include
-L/home/smallbird/tslib1.4/lib

exit

small_bird

@jsulm
As I did not designate the sysroot option, the compiler should seek the headers and libraries in the folder /usr/include.
Now the folder has the xcb/xcb.h. However the result is still the same:

"xcb auto-detection... ()
arm-linux-g++ -lts -c -pipe -O2 -Wall -W -fPIC -I. -I../../../mkspecs/linux-arm-gnueabi-g++ -o xcb.o xcb.cpp
xcb.cpp:34: fatal error: xcb/xcb.h: No such file or directory
compilation terminated.
Makefile:172: recipe for target 'xcb.o' failed
make: *** [xcb.o] Error 1
xcb disabled.
The test for linking against libxcb failed!
You might need to install dependency packages for libxcb.
See src/plugins/platforms/xcb/README.
"
How could it be like that? This is my /usr/include:
root@ubuntu:/home/smallbird/qt-everywhere-opensource-src-5.6.0# ls /usr/include/
aio.h expat_external.h lastlog.h netipx rpcsvc termios.h
aliases.h expat.h libgen.h netiucv sched.h tgmath.h
alloca.h fcntl.h libintl.h netpacket scsi thread_db.h
argp.h features.h libio.h netrom search.h time.h
argz.h fenv.h libpng netrose semaphore.h ttyent.h
ar.h fmtmsg.h libpng12 nfs setjmp.h uapi
arpa fnmatch.h limits.h nl_types.h sgtty.h uchar.h
asm-generic fontconfig link.h nss.h shadow.h ucontext.h
assert.h freetype2 linux obstack.h signal.h ulimit.h
autosprintf.h fstab.h locale.h paths.h sound unistd.h
byteswap.h fts.h malloc.h pngconf.h spawn.h ustat.h
c++ ftw.h math.h png.h stab.h utime.h
complex.h _G_config.h mcheck.h poll.h stdc-predef.h utmp.h
cpio.h gconv.h memory.h printf.h stdint.h utmpx.h
crypt.h getopt.h misc protocols stdio_ext.h values.h
ctype.h gettext-po.h mntent.h pthread.h stdio.h video
dirent.h glob.h monetary.h pty.h stdlib.h wait.h
dlfcn.h gnumake.h mqueue.h pwd.h string.h wchar.h
drm gnu-versions.h mtd python3.5m strings.h wctype.h
elf.h grp.h net rdma stropts.h wordexp.h
endian.h gshadow.h netash re_comp.h sudo_plugin.h X11
envz.h i386-linux-gnu netatalk regex.h syscall.h xcb
err.h iconv.h netax25 regexp.h sysexits.h xen
errno.h ifaddrs.h netdb.h reglib syslog.h xlocale.h
error.h inttypes.h neteconet resolv.h tar.h xorg
execinfo.h langinfo.h netinet rpc termio.h zlib.h

This is what xcb folder contains:

root@ubuntu:/home/smallbird/qt-everywhere-opensource-src-5.6.0# ls /usr/include/xcb/
bigreq.h glx.h screensaver.h xcb_cursor.h xcb_image.h xevie.h xproto.h
composite.h present.h shape.h xcb_event.h xcb_keysyms.h xf86dri.h xtest.h
damage.h randr.h shm.h xcb_ewmh.h xcb_pixel.h xfixes.h xv.h
dpms.h record.h sync.h xcbext.h xcb_renderutil.h xinerama.h xvmc.h
dri2.h render.h xcb_atom.h xcb.h xcb_util.h xkb.h
dri3.h res.h xcb_aux.h xcb_icccm.h xc_misc.h xprint.h

You might say that I should not use the super user as root, but if not, some folders could not be entered. Could you offer me help? Thanks a lot!

small_bird

@SGaist Someone told me : "You don't have X11 development packages installed for the arm target, then. Stuff in /usr/include/X11 is for the host, not for the target." However, I wonder how to install the packages for the arm target !