Qt6.2 for Jetson TX2NX - EGLFS configuration problems

[therealmatiss]

Hello!

I'm trying to compile Qt6.2 for Nvidia Jetson TX2NX. I have successfully compiled Qt5.15 but I'm having problems with Qt6 cmake script finding my OpenGL libs.

First of all, weird problem is this - how did it find EGL version 1.5 but is missing HAVE_EGL flag:

-- Could NOT find EGL (missing: HAVE_EGL) (found version "1.5")
-- Could NOT find GLESv2 (missing: HAVE_GLESv2 HAVE_GLESv2) 

ERROR: The OpenGL functionality tests failed!  You might need to modify the include and library search paths by editing QMAKE_INCDIR_OPENGL[_ES2], QMAKE_LIBDIR_OPENGL[_ES2] and QMAKE_LIBS_OPENGL[_ES2] in the mkspec for your platform.

The configure script I'm using is:

../qtbase-everywhere-src-6.2.0/configure -release -device linux-jetson-tx2-g++ -device-option CROSS_COMPILE=/home/matiss/qt6nx/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu- -device-option DISTRO_OPTS="hard-float" -opengl es2 -nomake examples -nomake tests -qt-host-path /home/matiss/Qt/6.2.0/gcc_64/ -extprefix /home/matiss/qt6nx/build/ -prefix /usr/local/qt6nx -- -DCMAKE_TOOLCHAIN_FILE=/home/matiss/qt6nx/toolchain.cmake -DQT_BUILD_TOOLS_WHEN_CROSSCOMPILING=OFF

My qmake.conf for TX2NX is the same I used for Qt5.15 and the sysroot is also the same as when I compiled 5.15.

#
# qmake configuration for Jetson TX2 NX boards running 64-bit Linux For Tegra
#

include(../common/linux_device_pre.conf)

QMAKE_INCDIR_POST += \
    $$[QT_SYSROOT]/usr/include \
    $$[QT_SYSROOT]/usr/include/aarch64-linux-gnu

QMAKE_LIBDIR_POST += \
    $$[QT_SYSROOT]/usr/lib \
    $$[QT_SYSROOT]/lib/aarch64-linux-gnu \
    $$[QT_SYSROOT]/usr/lib/aarch64-linux-gnu

QMAKE_RPATHLINKDIR_POST += \
    $$[QT_SYSROOT]/usr/lib \
    $$[QT_SYSROOT]/usr/lib/aarch64-linux-gnu \
    $$[QT_SYSROOT]/usr/lib/aarch64-linux-gnu/tegra \
    $$[QT_SYSROOT]/lib/aarch64-linux-gnu
    
QMAKE_INCDIR_EGL = $$[QT_SYSROOT]/usr/lib/aarch64-linux-gnu/tegra-egl

DISTRO_OPTS += aarch64
COMPILER_FLAGS += -march=armv8-a+crypto+crc

EGLFS_DEVICE_INTEGRATION = eglfs_kms_egldevice

include(../common/linux_arm_device_post.conf)
load(qt_config)

If it's the problem that I haven't defined QMAKE_INCDIR_OPENGL[_ES2], QMAKE_LIBDIR_OPENGL[_ES2] and QMAKE_LIBS_OPENGL[_ES2] then I have question - what are the library names I need to find for these defined paths?

Any ideas, what could be the issue here? I would understand this problem if it didn't work in 5.15 but it does on that version and doesn't work on the new 6.2. And yes, I did use EGLFS, when compiled 5.15.

Thanks in advance! :)

[therealmatiss]

I managed to solve this issue. QMake errors are something old that hasn't been deleted and these variables are not used anymore. I managed to solve this by:

1. Adding this to toolchain.cmake file:
   set(GLESv2_LIBRARY ${TARGET_SYSROOT}/usr/lib/aarch64-linux-gnu/tegra-egl/libGLESv2_nvidia.so.2)
set(EGL_LIBRARY ${TARGET_SYSROOT}/usr/lib/aarch64-linux-gnu/tegra-egl/libEGL_nvidia.so.0)
set(OPENGL_egl_LIBRARY ${TARGET_SYSROOT}/usr/lib/aarch64-linux-gnu/tegra-egl/libEGL_nvidia.so.0)
   I found the library variables by opening CMakeCache.txt in my build folder.

2. Editing FindGLESv2.cmake (commenting out C code and setting HAVE_GLESv2 to true). Of course then you have to be sure that you are using the correct libGLESv2.

#    check_cxx_source_compiles("
#ifdef __APPLE__
#  include <OpenGLES/ES2/gl.h>
#else
#  define GL_GLEXT_PROTOTYPES
#  include <GLES2/gl2.h>
#endif

#int main(int argc, char *argv[]) {
#    glUniform1f(1, GLfloat(1.0));
#    glClear(GL_COLOR_BUFFER_BIT);
#}" HAVE_GLESv2)

set(HAVE_GLESv2 True)

2. Editing FindEGL.cmake just like FindGLESv2.cmake

#check_cxx_source_compiles("
##include <EGL/egl.h>
#
#int main(int argc, char *argv[]) {
#    EGLint x = 0; EGLDisplay dpy = 0; EGLContext ctx = 0;
#    eglDestroyContext(dpy, ctx);
#}" HAVE_EGL)

set(HAVE_EGL True)

cmake_pop_check_state()

[Massinissa_idiri]

Hello, I'm trying to compile Qt6 for cross compile for my jetson orin nano and i'm having some trouble doing it even if Qt5.15 worked perfectly fine.
I xould like to know which toolchain did you used ? What have you put in your toolchain.cmake ? Atucally I follow the wiki qt for cross compiling for raspPI but my compilation was donc on a wrong architecture (x86). Thank you for your help