Avr-g++: no such file or directory

[asimovc]

Describe the problem

Compilation for arduino:avr:mega fails::

Error during build: fork/exec /home/hellboy/.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino7/bin/avr-g++: no such file or directory

I do have the arduino:avr platform installed:

$ arduino-cli core list
ID          Installed Latest Name              
arduino:avr 1.8.6     1.8.6  Arduino AVR Boards

Verbose compilation output:

FQBN: arduino:avr:mega
Using board 'mega' from platform in folder: /home/hellboy/.arduino15/packages/arduino/hardware/avr/1.8.6
Using core 'arduino' from platform in folder: /home/hellboy/.arduino15/packages/arduino/hardware/avr/1.8.6

Detecting libraries used...
/home/hellboy/.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino7/bin/avr-g++ -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -I/home/hellboy/.arduino15/packages/arduino/hardware/avr/1.8.6/cores/arduino -I/home/hellboy/.arduino15/packages/arduino/hardware/avr/1.8.6/variants/mega /tmp/arduino/sketches/6A5A29022208ED9700955194B4CCD27C/sketch/Test.ino.cpp -o /dev/null


Used platform Version Path                                                        
arduino:avr   1.8.6   /home/hellboy/.arduino15/packages/arduino/hardware/avr/1.8.6
Error during build: fork/exec /home/hellboy/.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino7/bin/avr-g++: no such file or directory

To reproduce

just use arduino-cli compile -b arduino:avr:mega Sketch

Expected behavior

Compile the sketch

Arduino CLI version

0.34.2 Commit: 963c1a7 Date: 2023-09-11T10:05:42Z

Operating system

Linux

Operating system version

Kiss Linux With Latest Version

Additional context

My OS can be found in here and it uses musl libc and busybox as default.

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the nightly build
• My report contains all necessary details

[umbynos]

Seems related to #1208

[cmaglie]

Does /home/hellboy/.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino7/bin/avr-g++ exists?

[asimovc]

Turns out that is a problem related to glibc link, i used a musl distro when i have this bug. Just build and use gcompat solved the problem with the bin linked against glibc. The problem has not been solved in general, maybe given a binarie linked against musl can solve it.

[anttiryt]

I had this same problem. Installer tried incorrectly install aarch64 binaries on 32bit raspbian os running on 64-bit rpi4.

Key findings:

pi@kellari-hel:~ $ .arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino7/bin/avr-g++ --help
bash: .arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino7/bin/avr-g++: cannot execute: required file not found

pi@kellari-hel:~ $ uname -a
Linux kellari-hel.truescape.fi 6.6.31+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.6.31-1+rpt1 (2024-05-29) aarch64 GNU/Linux

pi@kellari-hel:~ $ file .arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino7/bin/avr-g++ 
.arduino15/packages/arduino/tools/avr-gcc/7.3.0-atmel3.6.1-arduino7/bin/avr-g++: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, for GNU/Linux 3.7

The installer:

$ !150
curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | sh
Installing in /home/pi/bin
ARCH=ARM64
OS=Linux
Using curl as download tool
Downloading https://downloads.arduino.cc/arduino-cli/arduino-cli_1.3.1_Linux_ARM64.tar.gz
arduino-cli  Version: 1.3.1 Commit: 08ff7e2b Date: 2025-08-28T13:51:43Z installed successfully in /home/pi/bin

Currently installer checks for Arch as such:

arduino-cli/install.sh

Lines 37 to 51 in 7b8b215

	initArch() {
	ARCH=$(uname -m)
	case $ARCH in
	armv5*) ARCH="armv5" ;;
	armv6*) ARCH="ARMv6" ;;
	armv7*) ARCH="ARMv7" ;;
	aarch64) ARCH="ARM64" ;;
	arm64) ARCH="ARM64" ;;
	x86) ARCH="32bit" ;;
	x86_64) ARCH="64bit" ;;
	i686) ARCH="32bit" ;;
	i386) ARCH="32bit" ;;
	esac
	echo "ARCH=$ARCH"
	}

aarch64 is reported on RPi4/5 on 32bit os.

Command to check the 32/64bit OS is:

getconf LONG_BIT

as such:

$ getconf LONG_BIT
32

Quickfix for impatient, edit install.sh, around line 39

initArch() {
  ARCH=$(uname -m)
  ARCH="ARMv7"    <-  add this line
  case $ARCH in