Using toolchain-atmelavr v5.4.0 vs v7.3.0

Hello everyone 😃

I was simply trying to include #include <cstdint> for ATmega2561 which didn’t work on v5.4.0 or v7.3.0 so maybe avr doesn’t support it (curious about some C++ features). Anyway… I saw a big difference in program size between using v5.4.0 or v7.3.0: 468 byte difference to be exact!

[env]
platform = atmelavr
framework = arduino
monitor_speed = 115200

board_build.f_cpu = 16000000L
board_hardware.uart = uart0
board_hardware.oscillator = external

upload_flags = -Pusb

; Use latest version (version 7.3.0)
platform_packages = 
    toolchain-atmelavr@~1.70300.191015

[env:megaatmega2561]
board = ATmega2561
board_build.mcu = atmega2561

I am curious why v7.3.0 is not the default? Are there some compatability issues? Also is it possible to use an even newer version for avr-gcc? I noticed Arduino IDE uses v7.3.0 in their latest version v1.8.13

toolchain-atmelavr v5.4.0

toolchain-atmelavr v7.3.0

[EmperorArthur]

At the least the documentation around “toolchain-atmelavr” could be expanded. Especially since this will probably happen again in the future. Instead of stumbling around, trying to figure out where to get the latest version, there should be a page somewhere.

As an example:

• The first google result, which is an old version of the docs, inaccurately says that “toolchain-atmelavr” contains multiple things, but has no links to the package itself
• The latest version of the docs, just link to GCC’s latest page on the AVR. Not even the one for the compiler we’re using!
• The packages page on the main site, also just links to GCC!
• Searching Google for “toolchain-atmelavr 7.3” (without the quotes) now brings up fixes, but they don’t explain why the version numbers correspond

Heck, I have no idea where the “toolchain-atmelavr” repository is, where PlatfomIO downloads it from, or even how it is built!

This might be another issue, but it certainly made something as easy as upgrading a dependency into a nightmare.

[gudnimg]

You can do it like this:

; Use latest version (v7.3.0)
platform_packages = 
    toolchain-atmelavr@~1.70300.191015