How correctly to compile Qt5 to arm64 on Ubuntu 22.04?

[Sergey_11]

Host: Ubuntu 20.04 x64

   Architecture:                    x86_64
   CPU op-mode(s):                  32-bit, 64-bit
   Byte Order:                      Little Endian
   Address sizes:                   43 bits physical, 48 bits virtual
   CPU(s):                          4
   On-line CPU(s) list:             0-3
   Thread(s) per core:              2
   Core(s) per socket:              2
   Socket(s):                       1
   NUMA node(s):                    1
   Vendor ID:                       AuthenticAMD
   CPU family:                      23
   Model:                           32
   Model name:                      AMD Athlon Silver 3050e with Radeon Graphics
   Stepping:                        1
   Frequency boost:                 enabled
   CPU MHz:                         946.324
   CPU max MHz:                     1400,0000
   CPU min MHz:                     1000,0000
   BogoMIPS:                        2794.78
   Virtualization:                  AMD-V
   L1d cache:                       64 KiB
   L1i cache:                       128 KiB
   L2 cache:                        1 MiB
   L3 cache:                        4 MiB
   NUMA node0 CPU(s):               0-3
   Vulnerability Itlb multihit:     Not affected
   Vulnerability L1tf:              Not affected
   Vulnerability Mds:               Not affected
   Vulnerability Meltdown:          Not affected
   Vulnerability Mmio stale data:   Not affected
   Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled v
                                    ia prctl and seccomp
   Vulnerability Spectre v1:        Mitigation; usercopy/swapgs barriers and __user
                                     pointer sanitization
   Vulnerability Spectre v2:        Mitigation; Retpolines, IBPB conditional, STIBP
                                     always-on, RSB filling
   Vulnerability Srbds:             Not affected
   Vulnerability Tsx async abort:   Not affected
   Flags:                           fpu vme de pse tsc msr pae mce cx8 apic sep mtr
                                    r pge mca cmov pat pse36 clflush mmx fxsr sse s
                                    se2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtsc
                                    p lm constant_tsc rep_good nopl nonstop_tsc cpu
                                    id extd_apicid aperfmperf pni pclmulqdq monitor
                                     ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes 
                                    xsave avx f16c rdrand lahf_lm cmp_legacy svm ex
                                    tapic cr8_legacy abm sse4a misalignsse 3dnowpre
                                    fetch osvw skinit wdt tce topoext perfctr_core 
                                    perfctr_nb bpext perfctr_llc mwaitx cpb hw_psta
                                    te sme ssbd sev ibpb stibp vmmcall fsgsbase bmi
                                    1 avx2 smep bmi2 rdseed adx smap clflushopt sha
                                    _ni xsaveopt xsavec xgetbv1 xsaves clzero irper
                                    f xsaveerptr arat npt lbrv svm_lock nrip_save t
                                    sc_scale vmcb_clean flushbyasid decodeassists p
                                    ausefilter pfthreshold avic v_vmsave_vmload vgi
                                    f overflow_recov succor smca

Target: Raspberry Pi 4 with Ubuntu 22.04 x64

Architecture:            aarch64
  CPU op-mode(s):        32-bit, 64-bit
  Byte Order:            Little Endian
CPU(s):                  4
  On-line CPU(s) list:   0-3
Vendor ID:               ARM
  Model name:            Cortex-A72
    Model:               3
    Thread(s) per core:  1
    Core(s) per cluster: 4
    Socket(s):           -
    Cluster(s):          1
    Stepping:            r0p3
    CPU max MHz:         1800,0000
    CPU min MHz:         600,0000
    BogoMIPS:            108.00
    Flags:               fp asimd evtstrm crc32 cpuid
Caches (sum of all):     
  L1d:                   128 KiB (4 instances)
  L1i:                   192 KiB (4 instances)
  L2:                    1 MiB (1 instance)
Vulnerabilities:         
  Itlb multihit:         Not affected
  L1tf:                  Not affected
  Mds:                   Not affected
  Meltdown:              Not affected
  Spec store bypass:     Vulnerable
  Spectre v1:            Mitigation; __user pointer sanitization
  Spectre v2:            Vulnerable
  Srbds:                 Not affected
  Tsx async abort:       Not affected

Main questions:

1. What is the best cross-platform compiler to use for this purpose given the architecture processors? ([https://releases.linaro.org/components/toolchain/binaries/latest-7/](link url))
2. In most of the guides, rsync is performed between a host on Ubuntu and a target on Raspbian. What directories need to be synchronized if both computers are on Ubuntu? For example, Ubuntu does not /opt/vc.
3. What parameters should be input to the ./config command before Qt5 compiling? Is the -eglfs option needed?

[SGaist]

Hi and welcome to devnet,

There are numerous guides about this topic.

I would suggest checking this one which seems to be similar to your setup.