cross-compiling on Ubuntu to rpi B+ raspbian stretch

jsulm

@flemingp So, ~/raspi/sysroot/usr/include/bluetooth/bluetooth.h exists?

flemingp

Indeed it does along with the header file

paul@paul-X200CA:~/raspi/sysroot/usr/include/bluetooth$ ls
bluetooth.h  bnep.h  cmtp.h  hci.h  hci_lib.h  hidp.h  l2cap.h  rfcomm.h  sco.h  sdp.h  sdp_lib.h
paul@paul-X200CA:~/raspi/sysroot/usr/include/bluetooth$

And sysroot is passed in configure command, noting that the sql module builds and compiles with not problems:


../qt-everywhere-src-5.11.2/configure -opengl es2 -device rasp-pi3-g++ -device-option CROSS_COMPILE=arm-linux-gnueabihf- -sysroot ~/raspi/sysroot -opensource -confirm-license -I~/raspi/sysroot/usr/include/ -make libs -prefix /usr/local/qt5pi -extprefix ~/raspi/qt5pi -hostprefix ~/raspi/qt5 -v -no-use-gold-linker -nomake examples -no-compile-examples -nomake tests  -skip qtwayland -skip qtwebengine -sql-mysql MYSQL_INCDIR=~/raspi/sysroot/usr/include/mysql MYSQL_LIBDIR=~/raspi/sysroot/usr/lib/arm-linux-gnueabihf --recheck-all
``

sierdzio

@flemingp said in cross-compiling on Ubuntu to rpi B+ raspbian stretch:

~/

Use full path, not ~ sign. It sometimes gets in the way.

flemingp

Used full path for sysroot with configure, same problem:

../qt-everywhere-src-5.11.2/configure -opengl es2 -device rasp-pi3-g++ -device-option CROSS_COMPILE=arm-linux-gnueabihf- -sysroot /home/paul/raspi/sysroot -opensource -confirm-license  -make libs -prefix /usr/local/qt5pi -extprefix ~/raspi/qt5pi -hostprefix ~/raspi/qt5 -v -no-use-gold-linker -nomake examples -no-compile-examples -nomake tests  -skip qtwayland -skip qtwebengine -sql-mysql MYSQL_INCDIR=~/raspi/sysroot/usr/include/mysql MYSQL_LIBDIR=~/raspi/sysroot/usr/lib/arm-linux-gnueabihf --recheck-all

flemingp

@sierdzio

By adding -I/home/paul/raspi/sysroot/usr/include/ -L/home/paul/raspi/sysroot/usr/lib/arm-linux-gnueabihf I have overcome the build error and am currently compiling. I have not marked this as solved, because I believe sysroot should pass the path without having to add it manually. But I am a novice so happy to stand corrected.

sierdzio

@flemingp said in cross-compiling on Ubuntu to rpi B+ raspbian stretch:

I believe sysroot should pass the path without having to add it manually.

You're right, usually it is not necessary.

flemingp

I spoke too soon, with the full paths I now get the following error when I run make:

/home/paul/raspi/qt-everywhere-src-5.11.2/qtbase/src/corelib/io/qfilesystemengine_unix.cpp: In static member function ‘static bool QFileSystemEngine::renameFile(const QFileSystemEntry&, const QFileSystemEntry&, QSystemError&)’:
/home/paul/raspi/qt-everywhere-src-5.11.2/qtbase/src/corelib/io/qfilesystemengine_unix.cpp:1286:19: error: ‘AT_FDCWD’ was not declared in this scope
     if (renameat2(AT_FDCWD, srcPath, AT_FDCWD, tgtPath, RENAME_NOREPLACE) == 0)
                   ^~~~~~~~
/home/paul/raspi/qt-everywhere-src-5.11.2/qtbase/src/corelib/io/qfilesystemengine_unix.cpp:1286:19: note: suggested alternative: ‘QT_GETCWD’
     if (renameat2(AT_FDCWD, srcPath, AT_FDCWD, tgtPath, RENAME_NOREPLACE) == 0)
                   ^~~~~~~~
                   QT_GETCWD
/home/paul/raspi/qt-everywhere-src-5.11.2/qtbase/src/corelib/io/qfilesystemengine_unix.cpp: At global scope:
/home/paul/raspi/qt-everywhere-src-5.11.2/qtbase/src/corelib/io/qfilesystemengine_unix.cpp:115:12: warning: ‘int statx(int, const char*, int, unsigned int, statx*)’ defined but not used [-Wunused-function]
 static int statx(int dirfd, const char *pathname, int flag, unsigned mask, struct statx *statxbuf)
            ^~~~~
/home/paul/raspi/qt-everywhere-src-5.11.2/qtbase/src/corelib/io/qfilesystemengine_unix.cpp:109:12: warning: ‘int renameat2(int, const char*, int, const char*, unsigned int)’ defined but not used [-Wunused-function]
 static int renameat2(int oldfd, const char *oldpath, int newfd, const char *newpath, unsigned flags)
            ^~~~~~~~~
Makefile:30263: recipe for target '.obj/qfilesystemengine_unix.o' failed
make[3]: *** [.obj/qfilesystemengine_unix.o] Error 1
make[3]: Leaving directory '/home/paul/raspi/qt5build/qtbase/src/corelib'
Makefile:224: recipe for target 'sub-corelib-make_first' failed
make[2]: *** [sub-corelib-make_first] Error 2
make[2]: Leaving directory '/home/paul/raspi/qt5build/qtbase/src'
Makefile:48: recipe for target 'sub-src-make_first' failed
make[1]: *** [sub-src-make_first] Error 2
make[1]: Leaving directory '/home/paul/raspi/qt5build/qtbase'
Makefile:81: recipe for target 'module-qtbase-make_first' failed
make: *** [module-qtbase-make_first] Error 2

Please can anyone help here ?

flemingp

I resolved my issue by adapting the configure statement at [link text]https://forum.qt.io/topic/91294/qt-on-raspberry-pi3/9(link url)

My final configure statement read:

../qt-everywhere-src-5.11.2/configure -opengl es2 -device rasp-pi3-g++ -device-option CROSS_COMPILE=arm-linux-gnueabihf- -sysroot /home/paul/raspi/sysroot -opensource -confirm-license \
-I/home/paul/raspi/sysroot/usr/include/  \
-L/home/paul/raspi/sysroot/usr/lib/arm-linux-gnueabihf -make libs -prefix /usr/local/qt5pi -extprefix ~/raspi/qt5pi -hostprefix ~/raspi/qt5 -v -no-use-gold-linker -nomake examples -no-compile-examples -nomake tests \
-sql-mysql MYSQL_INCDIR=/home/paul/raspi/sysroot/usr/include/mysql \
MYSQL_LIBDIR=/home/paul/raspi/sysroot/usr/lib/arm-linux-gnueabihf \
-skip qtserialbus -skip qtscxml -skip qtscript -skip qtcharts -skip qt3d \
-skip qtdatavis3d -skip qtcanvas3d -skip qtgamepad -skip qtvirtualkeyboard \
-skip qtwayland -skip qtwebengine -skip qtwebchannel -skip qtwebglplugin \
-skip qtwebsockets --recheck-all

I then needed to build my bluetooth module separately using a FRESH copy of qt-everywhere-src-5.11.2:

Before being able to build and compile the bluetooth module I found I needed to add some paths so qmake can find the headers and libraries.

~/raspi/qt5/bin/qmake -query

gives a list of values for the properties of qmake in the new directory ~/raspi/qt5

including QMAKE_XSPEC:devices/linux-rasp-pi3-g++

With that information the relevant qmake.conf file can be found : ~/raspi/qt5/mkspecs/devices/linux-rasp-pi3-g++/qmake.conf

This can then be edited so that qmake can find the relevant header and library files in sysroot (assuming they are there of course)

INCLUDEPATH+=/home/paul/raspi/sysroot/usr/include

LIBS +=-L/home/paul/raspi/sysroot/usr/lib/arm-linux-gnueabihf

After the file is edited, simply run ~/raspi/qt5/bin/qmake in the required module directory in my case 'qtconnectivity'

Then issue the commands

make -j

make install

Finally sync the newly created qt5pi directory with the one on the pi.

rsync -avz qt5pi pi@192.168.1.18:/usr/local

QT creator then configured and I was able to compile my app for the pi knowing far more about the cross compile process.

I

sierdzio

Great, thanks for sharing the solution!

Please consider updating the wiki with your new info. https://wiki.qt.io/RaspberryPi2EGLFS

blazej222

@flemingp Sorry for bumping, but I have exactly the same problem - I'm trying to cross-compile qt5 for raspberry pi and encounter error

io/qfilesystemengine_unix.cpp: In function ‘int qt_statx(const char*, statx*)’:
io/qfilesystemengine_unix.cpp:321:26: error: ‘AT_FDCWD’ was not declared in this scope
  321 |     return qt_real_statx(AT_FDCWD, pathname, 0, statxBuffer);
      |                          ^~~~~~~~
io/qfilesystemengine_unix.cpp: In function ‘int qt_lstatx(const char*, statx*)’:
io/qfilesystemengine_unix.cpp:326:26: error: ‘AT_FDCWD’ was not declared in this scope
  326 |     return qt_real_statx(AT_FDCWD, pathname, AT_SYMLINK_NOFOLLOW, statxBuffer);
      |                          ^~~~~~~~
io/qfilesystemengine_unix.cpp:326:46: error: ‘AT_SYMLINK_NOFOLLOW’ was not declared in this scope
  326 |     return qt_real_statx(AT_FDCWD, pathname, AT_SYMLINK_NOFOLLOW, statxBuffer);
      |                                              ^~~~~~~~~~~~~~~~~~~
io/qfilesystemengine_unix.cpp: In function ‘int qt_fstatx(int, statx*)’:
io/qfilesystemengine_unix.cpp:331:34: error: ‘AT_EMPTY_PATH’ was not declared in this scope
  331 |     return qt_real_statx(fd, "", AT_EMPTY_PATH, statxBuffer);
      |                                  ^~~~~~~~~~~~~
io/qfilesystemengine_unix.cpp: In static member function ‘static bool QFileSystemEngine::renameFile(const QFileSystemEntry&, const QFileSystemEntry&, QSystemError&)’:
io/qfilesystemengine_unix.cpp:1447:19: error: ‘AT_FDCWD’ was not declared in this scope
 1447 |     if (renameat2(AT_FDCWD, srcPath, AT_FDCWD, tgtPath, RENAME_NOREPLACE) == 0)
      |                   ^~~~~~~~

However, I don't understand your soultion. My configure script is:

./configure -release -opengl es2 -device linux-rasp-pi3-g++ -device-option CROSS_COMPILE=arm-linux-gnueabihf- -sysroot /mnt/linux_hdd/sysroot -opensource -confirm-license -I/mnt/linux_hdd/sysroot/usr/include/ -L/mnt/linux_hdd/sysroot/usr/lib/arm-linux-gnueabihf -skip qtserialbus -skip qtscxml -skip qtscript -skip qtcharts -skip qt3d -skip qtdatavis3d -skip qtcanvas3d -skip qtgamepad -skip qtvirtualkeyboard -skip qtwayland -skip qtwebengine -skip qtwebchannel -skip qtwebglplugin -skip qtwebsockets -make libs -prefix /usr/local/qt5pi -extprefix /mnt/linux_hdd/qt_rasp/qt5pi -hostprefix /mnt/linux_hdd/qt_rasp/qt5 -no-use-gold-linker -v -no-gbm

You said that after running configure you ran

~/raspi/qt5/bin/qmake -query

Yeah... except there's nothing inside my hostprefix directory. /mnt/linux_hdd/qt_rasp is empty. I've found the qmake binary inside qt-everywhere-src-5.15.1/qtbase/bin.

I've also added

INCLUDEPATH+=/mnt/linux_hdd/sysroot/usr/include/

LIBS +=-L/mnt/linux_hdd/sysroot/usr/lib/arm-linux-gnueabihf

to qtbase/mkspecs/devices/linux-rasp-pi3-g++/qmake.conf.
No difference. Compilation still fails with the same error.
I'm really losing my mind because I can't find a solution.
Would be really thankful for any suggestions