How do I prepare a Raspberry Pi with Raspbian so I can cross compile Qt5 programs from a Linux host? -


i want setup cross compile environment on linux raspberry pi 1. want try bleeding edge version, i.e. raspbian testing + qt5 dev branch.

this question: how can create modern cross compile toolchain raspberry pi 1?

...explains how gcc compiler, can create code raspberry pi 1. there changes necessary on raspbian use it? if so, ones?

a full toolchain need

a toolchain set of tools working generate binaries system. depending on how build toolchain, might end in being functional your own image, that's not, in fact problem, clone image , upgrade @ will.

first, understand need:

  • functional flagship system. reference board , reference distro bundle, packages , stuff. might want standard raspbian or might want stuff, opencv or less stuff removing xorg. want bleeding edge, fit taste.
  • sysroot. ideally copy of functional flagship system added development headers. in case same, raspbian image of second partition, 1 hosts /.
  • cross compiler. compiler generates code arm while running on x86 or x86_64. specialized gcc.
  • cross compiled qmake. qt need cross qmake, qmake generate qt binaries , uses things need generate arm qt software.
  • arm qt libraries. part of functional flagship system, enumerate here sake of clarity. compiled using sysroot , cross compiler.
  • qt libraries cross compiling. product of steps follow when generating cross compiling qmake , arm qt libraries. installed in host x86 system.

so how of this?

gather own toolchain

  • functional flagship system (fff). raspbian image , install additional software @ will, whatever want in, install on live raspberry.
  • sysroot. once have fff, use dd generate image of second raspbian partition. card off, insert x86 system , use dd. there other ways using mount , offsets lot simpler.
  • cross compiler. unless know doing, refrain creating yourself. there functional cross compilers.
  • qmake cross compiling, arm qt , qt libraries. interesting part...

cross compiling qt 5

you can go bleeding edge please qt git. not wiki enumerate steps. this guide explains lot more detail.

  1. get fff, image , cross compiler working.
  2. git clone qt, pick tag (version)
  3. mount sysroot
  4. get ia32-libs if under x64
  5. compile qtbase make install. important: after qtbase generates it's own qmake, use it on.
  6. use generated , installed qmake qtbase build other qt module want.
  7. remember use make install on qt modules build. these 'installs' copy binaries sysroot.
  8. get qt fff. either copy folder , avoid messing permissions, or more umount sysroot, use dd dump modified image same physical partition got from. these arm qt libraries.
  9. when building qtbase install stuff own x86 system. qmake cross compiling, use qt creator generate cross compiled binaries along cross compiler.

some notes nobody tells you

  • there seem no toolchains ready download. because depend lot on specific setup.
  • do not use system or regular qmake cross compile. use generated qmake, fits fff, has paths , other specific stuff baked in.
  • i repeat, not bother creating cross compiler
  • what if need additional development files? install them on fff, copy partition have new sysroot.
  • yes, can auto-deploy qt , debug remotely on live pi.

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