.. vim: set expandtab fileencoding=utf-8 nomodified wrap textwidth=200 shiftwidth=2 ts=2 foldmethod=marker foldcolumn=4 ruler showcmd lcs=tab\:|- list:
.. title: AVR crosscompile
.. slug: 2019-02-01-AVR-crosscompile
.. date: 2019-02-01 08:35:09 CET
.. tags: AVR,gentoo
.. category: AVR
.. link: 
.. description: Just random blog for 2019-02-01
.. type: text
.. author: Gilhad

.. |logo| image:: /images/logo/gilhad.png

Crosscompile chain pro AVR na Gentoo (+update)

.. TEASER_END

* https://wiki.gentoo.org/wiki/Arduino

* http://blog.tremily.us/posts/AVR/

Code:

.. code-block:: text
    
    # USE="-nls -openmp -pch -sanitize -vtv" crossdev -t avr -s4 --without-headers
    -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
     * crossdev version:      20151026
     * Host Portage ARCH:     amd64
     * Target Portage ARCH:   *
     * Target System:         avr
     * Stage:                 4 (C/C++ compiler)
     * ABIs:                  default
     
     * binutils:              binutils-[latest]
     * gcc:                   gcc-[latest]
     * libc:                  avr-libc-[latest]
    
     * CROSSDEV_OVERLAY:      /usr/local/portage-crossdev
     * PORT_LOGDIR:           /var/log/portage
     * PORTAGE_CONFIGROOT:    
     * Portage flags:         
      _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  
     * leaving sys-devel/binutils in /usr/local/portage-crossdev
     * leaving sys-devel/gcc in /usr/local/portage-crossdev
     * leaving dev-embedded/avr-libc in /usr/local/portage-crossdev
     * leaving sys-devel/gdb in /usr/local/portage-crossdev
     * leaving metadata/layout.conf alone in /usr/local/portage-crossdev
      _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  
     * Log: /var/log/portage/cross-avr-binutils.log
     * Emerging cross-binutils ...                                                                                                                                                                                                                                               [ ok ]
     * Log: /var/log/portage/cross-avr-gcc-stage1.log
     * Emerging cross-gcc-stage1 ...                                                                                                                                                                                                                                             [ ok ]
     * Log: /var/log/portage/cross-avr-avr-libc.log
     * Emerging cross-avr-libc ...                                                                                                                                                                                                                                               [ ok ]
     * Log: /var/log/portage/cross-avr-gcc-stage2.log
     * Emerging cross-gcc-stage2 ...                                                                                                                                                                                                                                             [ ok ]
    # updatedb
    # locate ldscripts/avr5.x
    ...
    /usr/lib64/binutils/avr/2.26.1/ldscripts/avr5.x
    # ln -s /usr/lib64/binutils/avr/2.26.1/ldscripts /usr/avr/lib/ldscripts



simple self test na ověření, že to aspoň nějak funguje: `simple_self_test.sh <listings/simple_self_test.sh.html>`_ a jeho `zdroj  <listings/simple_self_test.sh>`_


example build:

.. code-block:: bash
    
    #!/bin/bash -x
    # vim: fileencoding=utf-8:nomodified:nowrap:textwidth=0:foldmethod=marker:foldcolumn=4:syntax=sh:filetype=sh:ruler:showcmd:lcs=tab\:|- list
    #|
    if [ "$1" == "clean" ] ; then
      rm  *.elf *.asm *.dump  *.hdump  *.hex  *.o
      #*
      exit
    fi
    
    avr-gcc -c example.cpp -o example.o
    avr-gcc -c lib_4DM8010.cpp -o lib_4DM8010.o
    avr-gcc example.o lib_4DM8010.o -o example.elf
    avr-objcopy -O ihex -R .eeprom example.elf example.hex
    avr-gcc  -S -c  example.cpp -o example.asm
    avr-objdump -DCfhlSwz example.elf >example.dump
    avr-objdump -DCfhlSwz -m avr  example.hex >example.hdump


------

Update troubleshooting:

* Nějak mi přestalo kompilování jít,  projevovalo se to následující chybou (ostatně proto vzniknul simple_self_test.sh, viz výše) 

.. code-block:: text

    ldscripts/avr5.xn:17: nonconstant expression for length
    collect2: error: ld returned 1 exit status

* Řešení: nakonec jsem zjistil, že mám v systému nejméně dvě verze těch crossutils (avr-\*) nakonec jsem odinstaloval co se dalo, promazal ručně artefakty a znova
  nainstaloval, teď už to zase jde

------

* Po reinstalaci a spuštění testu nastala tato chyba:

.. code-block:: text

    /usr/libexec/gcc/avr/ld: cannot open linker script file ldscripts/avr5.xn: No such file or directory
    collect2: error: ld returned 1 exit status

* Řešení:

.. code-block:: text
   
    ln -s /usr/x86_64-pc-linux-gnu/avr/lib/ldscripts /usr/avr/lib/ldscripts