Description

Use conan to provide a C++ toolchain, including standard C++ library.

Install toolchain and C++ standard library

This repository is origanized to allow it to be used as a local conan index.

$ git clone https://github.com/jputcu/avr_conan.git
$ conan remote add avr_center ./avr_conan
$ conan search "*" -r avr_center
Found 4 pkg/version recipes matching * in avr_center
avr_center
  avr-libstdcpp
    avr-libstdcpp/1.0.1
  microchipavrgcc
    microchipavrgcc/3.7.0
  zakkembleavrgcc
    zakkembleavrgcc/13.2.0
    zakkembleavrgcc/15.2.0

The correct packages will be installed as dependency by the profile.

Compile GNU C++ cross compiler from source

$ cd toolchain/freestanding
$ conan create .
...
$ cd ../..

Provide the conan AVR settings

Install conan/settings_user.yml into ~/.conan2/.

Compile the example project

$ cd blink
$ conan build . -pr:h ../conan/profiles/arduino_uno --build missing
...
$ conan build . -pr:h ../conan/profiles/arduino_uno -s build_type=Debug --build missing
...

Advanced editors, like Clion, can use cmake presets, now we have:

$ cmake --list-presets
Available configure presets:

  "conan-atmega328p-minsizerel" - 'conan-atmega328p-minsizerel' config
  "conan-atmega328p-debug"      - 'conan-atmega328p-debug' config

$ conan install . -pr:h ../conan/profiles/arduino_uno --build missing
...
$ source build/Debug/generators/conanbuildenv-debug-avr.sh
...
$ cmake --preset conan-debug
...
$ cmake --build --preset conan-debug --verbose
...
$ source build/Debug/generators/deactivate_conanbuildenv-debug-avr.sh
Restoring environment

$ file build/Debug/blink.elf
build/Debug/blink.elf: ELF 32-bit LSB executable, Atmel AVR 8-bit, version 1 (SYSV), statically linked, with debug_info, not stripped

Potential

Other compiler

• Arduino AVR toolchain
• PlatformIO AVR toolchain
• https://github.com/modm-io/avr-gcc
• https://blog.zakkemble.net/avr-gcc-builds/
• Build AVR toolchain from source
• crosstool-ng, more specifically: crosstool-ng/crosstool-ng#2234

Offer HALs

• TODO

AVR friendly libraries

• ETL
• ArduinoJson

AVR architecture

Conan settings have the MCU specified as arch, this means no reuse between other atmegas. Perhaps we can use the arch there.