Qt 5.13.1 for raspberry pi CM3: "#include<random>" build error

[dxvx]

Hello everyone!
I'm trying to cross-compile qt 5.13.1 for raspberry pi3 (CM3) but I these problems:

qt-everywhere-5.13.1/qtbase> ./configure -release -opensource -confirm-license -no-use-gold-linker -c++std c++17 -opengl es2 -make libs -no-gbm \
-device linux-rasp-pi3-g++ -device-option CROSS_COMPILE=~/raspi-qt/gcc-linaro-7.4.1-x86_64_armv8l-linux-gnueabihf/bin/armv8l-linux-gnueabihf- \
-sysroot ~/raspi-qt/raspbian-sysroot -prefix /opt/qt5 -extprefix ~/raspi-qt/qt5-pi -hostprefix ~/raspi-qt/qt5-tools \
-skip qt3d -skip qtandroidextras -skip qtdatavis3d -skip qtmacextras -skip qtpurcheasing -skip qtwebchannel -skip qtwebengine -skip qtwebplugin -skip qtwebview -skip qtscript -skip qtwinextras -skip qtx11extras -nomake examples -nomake tests -no-compile-examples
...bla bla bla...
ERROR: Feature 'c++14' was enabled, but the pre-condition 'features.c++11 && tests.c++14' failed.
ERROR: Feature 'c++1z' was enabled, but the pre-condition 'features.c++14 && tests.c++1z' failed.
ERROR: C++11 <random> is required and is missing or failed to compile.
Check config.log for details.

or without -c++std c++17

qt-everywhere-5.13.1/qtbase> ./configure -release -opensource -confirm-license -no-use-gold-linker -opengl es2 -make libs -no-gbm \
-device linux-rasp-pi3-g++ -device-option CROSS_COMPILE=~/raspi-qt/gcc-linaro-7.4.1-x86_64_armv8l-linux-gnueabihf/bin/armv8l-linux-gnueabihf- \
-sysroot ~/raspi-qt/raspbian-sysroot -prefix /opt/qt5 -extprefix ~/raspi-qt/qt5-pi -hostprefix ~/raspi-qt/qt5-tools \
-skip qt3d -skip qtandroidextras -skip qtdatavis3d -skip qtmacextras -skip qtpurcheasing -skip qtwebchannel -skip qtwebengine -skip qtwebplugin -skip qtwebview -skip qtscript -skip qtwinextras -skip qtx11extras -nomake examples -nomake tests -no-compile-examples
...bla bla bla...
ERROR: C++11 <random> is required and is missing or failed to compile.

I have followed this tutorial but using the linaro toolchain 7.4.1 for armv8l. The original raspbian toolchain gives me the same errors.

What ca I do?
Many thanks!

[jsulm]

@dxvx Since 5.6 Qt requires C++11, you should activate that.

[dxvx]

@jsulm how can activate c++11?
When I perform the second compilation (without -c++std) the configure process gives:

Building on: linux-g++ (x86_64, CPU features: mmx sse sse2)
Building for: devices/linux-rasp-pi3-g++ (arm, CPU features: neon)
Target compiler: gcc 9.2.1
Configuration: cross_compile enable_new_dtags largefile neon precompile_header shared rpath release c++11 concurrent dbus reduce_exports stl
Build options:
  Mode ................................... release
  Optimize release build for size ........ no
  Building shared libraries .............. yes
  Using C standard ....................... C11
  Using C++ standard ..................... C++11
  Using ccache ........................... no
  Using new DTAGS ........................ yes
  Using precompiled headers .............. yes
  Using LTCG ............................. no
  Target compiler supports:
    NEON ................................. yes
  Build parts ............................ libs

so I think that c++11 is activated... Is it true?

[jsulm]

@dxvx said in Qt 5.13.1 for raspberry pi CM3: "#include<random>" build error:

so I think that c++11 is activated... Is it true?

Looks like it is, yes

"how can activate c++11?" -c++std c++11