Cross-compile Qt 5 on Pi 2 - undefined reference to `pcre_get_stringtable_entries'

[ashwasimha]

Hi All,

I am trying to compile Qt 5.4.1 on Pi 2 and I am following steps that are mentioned here.

I have done below mentioned steps :

1.) Setup environment
	mkdir ~/raspberry
	cd ~/raspberry

	wget http://www.tequnique.com/dl/raspberry/setdevenv
	mv setdevenv setdevenv.sh
	wget www.tequnique.com/dl/raspberry/gcc-4.7-linaro-rpi-gnueabihf.tbz
	tar xfj gcc-4.7-linaro-rpi-gnueabihf.tbz	

2.) On Raspberry (e.g. using SSH)
	ssh pi@"raspberry ip address"
	sudo apt-get update
	sudo apt-get upgrade

	sudo apt-get install libfontconfig1-dev libsqlite3-dev libxslt1-dev libssl-dev

	# For QMultimedia:
	sudo apt-get install libasound2-dev \ libavcodec-dev \ libavformat-dev \ libswscale-dev \ libgstreamer0.10-dev \ libgstreamer-plugins-base0.10-dev \ gstreamer-tools \ gstreamer0.10-plugins-good \ gstreamer0.10-plugins-bad

3.) Shutdown raspberry
	sudo shutdown -h now

4.) Remove SD card and insert into PC
	# Copy SD card to PC image
	cd ~/raspberry
	sudo dd if=/dev/sdb of=raspberry-working-image.img

5.) Mount image
	sudo /sbin/losetup /dev/loop0 raspberry-working-image.img
	sudo /sbin/fdisk -l /dev/loop0
	sudo mkdir /mnt/raspberry-rootfs
	sudo mount -o loop,offset=70254592 raspberry-working-image.img /mnt/raspberry-rootfs
	
6.) Cross compile tools
	source setdevenv.sh

7.) git clone https://git.milosolutions.com/other/cross-compile-tools/
	cd cross-compile-tools
	sudo ./fixQualifiedLibraryPaths $MOUNTPOINT ../gcc-4.7-linaro-rpi-gnueabihf/bin/arm-linux-gnueabihf-gcc

8.) sudo ln -s \
	$MOUNTPOINT/opt/vc/include/interface/vmcs_host/linux/vchost_config.h \
	$MOUNTPOINT/opt/vc/include/interface/vmcs_host/vchost_config.h

9.) wget download.qt.io/official_releases/qt/5.4/5.4.1/single/qt-everywhere-opensource-src-5.4.1.tar.xz
	tar xfvz qt-everywhere-opensource-src-5.4.1.tar.gz
	cd qt-everywhere-opensource-src-5.4.1

10.) ./configure \
	-release \
	-opengl es2 \
	-optimized-qmake \
	-no-pch \
	-make libs \
	-make tools \
	-reduce-exports \
	-sysroot /mnt/raspberry-rootfs \
	-device linux-rasp-pi-g++ \
	-device-option CROSS_COMPILE=/home/myhome/temporary/raspberry/gcc-4.7-linaro-rpi-gnueabihf/bin/arm-linux-gnueabihf- \
	-prefix /usr/local/Qt-5.4.1-raspberry \
	-opensource -nomake examples -nomake tests \
	-confirm-license

11.) make -j4

When I compile the code, I am getting these errors :

/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `get_matched_substring_number':
(.text+0x1e8): undefined reference to `pcre_get_stringtable_entries'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `get_matched_substring_number':
(.text+0x264): undefined reference to `pcre_get_stringnumber'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `g_match_info_next':
(.text+0xa48): undefined reference to `pcre_exec'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `regex_compile':
(.text+0x1518): undefined reference to `pcre_compile2'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `regex_compile':
(.text+0x1530): undefined reference to `pcre_fullinfo'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `regex_compile':
(.text+0x1590): undefined reference to `pcre_fullinfo'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `match_info_new':
(.text+0x1de4): undefined reference to `pcre_fullinfo'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `g_regex_unref':
(.text+0x1e9c): undefined reference to `pcre_free'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `g_regex_new':
(.text+0x2084): undefined reference to `pcre_study'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `g_regex_new':
(.text+0x2110): undefined reference to `pcre_config'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `g_regex_new':
(.text+0x2140): undefined reference to `pcre_config'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `g_regex_get_max_backref':
(.text+0x2250): undefined reference to `pcre_fullinfo'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `g_regex_get_capture_count':
(.text+0x22a0): undefined reference to `pcre_fullinfo'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `g_regex_get_has_cr_or_lf':
(.text+0x22f0): undefined reference to `pcre_fullinfo'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `g_regex_get_max_lookbehind':
(.text+0x2348): undefined reference to `pcre_fullinfo'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `g_regex_match_all_full':
(.text+0x26e0): undefined reference to `pcre_dfa_exec'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `g_regex_match_all_full':
(.text+0x283c): undefined reference to `pcre_free'
/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/libglib-2.0.a(libglib_2_0_la-gregex.o): In function `g_regex_get_string_number':
(.text+0x288c): undefined reference to `pcre_get_stringnumber'
collect2: error: ld returned 1 exit status
Makefile:964: recipe for target '../../lib/libQt5Widgets.so.5.6.2' failed
make[3]: *** [../../lib/libQt5Widgets.so.5.6.2] Error 1
make[3]: Leaving directory '/home/myhome/Documents/qt-source-code/qt5/qtbase/src/widgets'
Makefile:631: recipe for target 'sub-widgets-make_first' failed
make[2]: *** [sub-widgets-make_first] Error 2
make[2]: Leaving directory '/home/myhome/Documents/qt-source-code/qt5/qtbase/src'
Makefile:46: recipe for target 'sub-src-make_first' failed
make[1]: *** [sub-src-make_first] Error 2
make[1]: Leaving directory '/home/myhome/Documents/qt-source-code/qt5/qtbase'
Makefile:67: recipe for target 'module-qtbase-make_first' failed
make: *** [module-qtbase-make_first] Error 2

Below mentioned in the output of configure command :

Running configuration tests (phase 2)...
Note: PKG_CONFIG_LIBDIR automatically set to /mnt/raspberry-rootfs/usr/lib/pkgconfig:/mnt/raspberry-rootfs/usr/share/pkgconfig:/mnt/raspberry-rootfs/usr/lib/arm-linux-gnueabihf/pkgconfig
Note: PKG_CONFIG_SYSROOT_DIR automatically set to /mnt/raspberry-rootfs
checking for C++11...  yes.
checking for C++14...  no.
checking for default C++ standard edition...  yes.
checking for 64-bit std::atomic...  yes.
checking for sse2...  no.
checking for ipc_sysv...  yes.
checking for zlib...  yes.
checking for mtdev...  yes.
checking for libjpeg...  yes.
checking for libpng...  no.
checking for dlopen...  no.
checking for libdl...  no.
checking for DB2...  no.
checking for InterBase...  no.
checking for MySQL (thread-safe)...  no.
checking for MySQL (thread-unsafe)...  no.
checking for OCI...  no.
checking for ODBC...  yes.
checking for PostgreSQL...  no.
checking for SQLite2...  yes.
checking for TDS...  yes.
checking for Cups...  yes.
checking for POSIX iconv...  yes.
checking for D-Bus...  no.
checking for libproxy...  no.
checking for Glib...  yes.
checking for ICU...  no.
checking for PulseAudio...  no.
checking for OpenGL ES 2.0...  yes.
checking for OpenGL ES 3.0...  yes.
checking for OpenGL ES 3.1...  no.
checking for FontConfig...  yes.
checking for libudev...  no.
checking for evdev...  yes.
checking for tslib...  yes.
checking for xkbcommon...  yes.
checking for XLib...  yes.
checking for Xrender...  yes.
checking for XInput2...  yes.
checking for xcb...  yes.
checking for xcb-xkb...  yes.
checking for xcb-syslibs...  yes.
checking for xcb-render...  yes.
checking for xcb-glx...  yes.
checking for xcb-xlib...  yes.
checking for GBM...  yes.
checking for LinuxFB...  yes.
checking for KMS...  yes.
checking for Mir client...  no.
checking for EGL...  yes.
checking for EGL-X11...  no.
checking for eglfs-brcm...  yes.
checking for eglfs-egldevice...  no.
checking for eglfs-mali...  no.
checking for eglfs-mali-2...  no.
checking for eglfs-viv...  no.
checking for STL...  yes.
checking for POSIX clock_gettime()...  yes.
checking for POSIX Monotonic Clock...  yes.
checking for posix_fallocate...  yes.
checking for mremap...  yes.
checking for getaddrinfo...  yes.
checking for inotify...  yes.
checking for eventfd...  yes.
checking for IPv6 interface name...  yes.
checking for getifaddrs...  yes.
checking for cloexec...  yes.
checking for OpenSSL...  yes.
checking for PCRE...  no.
checking for OpenVG...  yes.
checking for ShivaVG...  no.
checking for alsa...  yes.
checking for GStreamer 1.0...  no.
checking for GStreamer 0.10...  no.
Done running configuration tests.

   Configure summary

Building on:   linux-g++ (i386, CPU features: none detected)
Building for:  devices/linux-rasp-pi-g++ (arm, CPU features: none detected)
Platform notes:

            - Also available for Linux: linux-clang linux-kcc linux-icc linux-cxx
        
Build options:
  Configuration .......... accessibility accessibility-atspi-bridge alsa audio-backend c++11 clock-gettime clock-monotonic compile_examples concurrent cross_compile cups dbus egl eglfs eglfs_brcm eglfs_gbm enable_new_dtags evdev eventfd fontconfig full-config gbm getaddrinfo getifaddrs glib gtk2 gtkstyle harfbuzz iconv inotify ipv6ifname kms large-config largefile linuxfb medium-config minimal-config mremap mtdev no-libdl opengl opengles2 openssl openvg pcre png posix_fallocate qpa qpa reduce_exports release release_tools rpath shared small-config system-freetype system-jpeg system-zlib threadsafe-cloexec tslib xcb xcb-glx xcb-plugin xcb-render xcb-sm xcb-xlib xinput2 xkbcommon-evdev xlib xrender 
  Build parts ............  libs tools
  Mode ................... release; optimized tools
  Using sanitizer(s)...... none
  Using C++ standard ..... c++11
  Using gold linker....... no
  Using new DTAGS ........ yes
  Using PCH .............. no
  Using LTCG ............. no
  Target compiler supports:
    Neon ................. no

Qt modules and options:
  Qt D-Bus ............... yes (loading dbus-1 at runtime)
  Qt Concurrent .......... yes
  Qt GUI ................. yes
  Qt Widgets ............. yes
  Large File ............. yes
  QML debugging .......... yes
  Use system proxies ..... no

Support enabled for:
  Accessibility .......... yes
  ALSA ................... yes
  CUPS ................... yes
  Evdev .................. yes
  FontConfig ............. yes
  FreeType ............... yes (system library)
  Glib ................... yes
  GStreamer .............. no
  GTK theme .............. yes
  HarfBuzz ............... yes (bundled copy)
  Iconv .................. yes
  ICU .................... no
  Image formats: 
    GIF .................. yes (plugin, using bundled copy)
    JPEG ................. yes (plugin, using system library)
    PNG .................. yes (in QtGui, using bundled copy)
  libinput................ no
  Logging backends: 
    journald ............... no
    syslog   ............... no
  mtdev .................. yes (system library)
  Networking: 
    getaddrinfo .......... yes
    getifaddrs ........... yes
    IPv6 ifname .......... yes
    libproxy.............. no
    OpenSSL .............. yes (loading libraries at run-time)
  OpenGL / OpenVG: 
    EGL .................. yes
    OpenGL ............... yes (OpenGL ES 2.0+)
    OpenVG ............... yes-auto
  PCRE ................... yes (bundled copy)
  pkg-config ............. yes 
  PulseAudio ............. no
  QPA backends: 
    DirectFB ............. no
    EGLFS ................ yes
      EGLFS i.MX6 ........ no
      EGLFS i.MX6 Wayland. no
      EGLFS EGLDevice .... no
      EGLFS GBM .......... yes
      EGLFS Mali ......... no
      EGLFS Raspberry Pi . yes
      EGLFS X11 .......... no
    LinuxFB .............. yes
    Mir client............ no
    XCB .................. yes (system library)
      EGL on X ........... no
      GLX ................ yes
      MIT-SHM ............ yes
      Xcb-Xlib ........... yes
      Xcursor ............ yes (loaded at runtime)
      Xfixes ............. yes (loaded at runtime)
      Xi ................. no
      Xi2 ................ yes
      Xinerama ........... yes (loaded at runtime)
      Xrandr ............. yes (loaded at runtime)
      Xrender ............ yes
      XKB ................ yes
      XShape ............. yes
      XSync .............. yes
      XVideo ............. yes
  Session management ..... yes
  SQL drivers: 
    DB2 .................. no
    InterBase ............ no
    MySQL ................ no
    OCI .................. no
    ODBC ................. yes (plugin)
    PostgreSQL ........... no
    SQLite 2 ............. yes (plugin)
    SQLite ............... yes (plugin, using bundled copy)
    TDS .................. yes (plugin)
  tslib .................. yes
  udev ................... no
  xkbcommon-x11........... yes (system library)
  xkbcommon-evdev......... yes
  zlib ................... yes (system library)


NOTE: Qt is using double for qreal on this system. This is binary incompatible against Qt 5.1.
Configure with '-qreal float' to create a build that is binary compatible with 5.1.

NOTE: -optimized-tools is not useful in -release mode.


Qt is now configured for building. Just run 'make'.
Once everything is built, you must run 'make install'.
Qt will be installed into /usr/local/Qt-5.4.1-raspberry

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

Can anyone please help me fixing this error? Please let me know your suggestions/comments. Thanks in advance.

[synapticvoid]

Hi ashwasimha,

We created a tool named qtrpi to automate the Qt cross-compilation on a Raspberry Pi. Maybe these scripts could help you to have a running Qt on your Raspberry Pi.

There are 2 possible use cases for qtrpi:

• qtrpi-full, in which everything is built automatically on your host machine (sysroot, Qt)
• qtrpi-minimal, in which you download a ready-to-use sysroot with pre-compiled Qt binaries

Overall, you only have to export a couple of environment variables (to select your version of Raspberry Pi / version of Qt) and execute a bash script.

When qtrpi (full or minimal) is ready on your host machine, we also provide a script that installs Qt on your Raspberry Pi.

Today, we support the Raspberry Pi 1, 2 and 3 and provide Qt 5.6 / 5.7 for each Raspberry Pi. If you are interested, here are a few links:

• the official website http://www.qtrpi.com/
• the repository containing all the scripts (everything is open-source): https://github.com/neuronalmotion/qtrpi
• The guide to use qtrpi: http://www.qtrpi.com/faq#howtoinstall

If you have any questions / remarks, we would gladly discuss them with you, we want to improve this tool and make Qt easy to use on embedded platforms.