espressif
Crash during compilation on Windows if username contains accented characters (e.g. "é") – introduced in 3.1.0
Board
Lolin S2 Mini (ESP32-S2)
Device Description
Nothing
Hardware Configuration
Nothing
Version
v3.1.2
IDE Name
Arduino IDE 2.3.4
Operating System
Windows 11
Flash frequency
80 Mhz
PSRAM enabled
yes
Upload speed
115200
Description
Bug Summary
On Windows, if the current user's username contains an accented character (e.g. "Gérard"), version 3.1.0, 3.1.1 and 3.1.2 of the ESP32 Arduino core crash during compilation with this Rust panic:
thread 'main' panicked at 'assertion failed: (left != right) left: 0, right: 0: Failed to get path name. Error code: 3', main.rs:65:9 exit status 101
Affected Versions
- ✅ 3.0.7 → Works fine
- ❌ 3.1.0 → Fails
- ❌ 3.1.1 → Fails
- ❌ 3.1.2 → Fails
System
- Windows 11
- Arduino IDE 2.3.4
- Board: Lolin S2 Mini (ESP32-S2)
- User account name:
Gérard→ stored in path likeC:\Users\Gérard
Steps to Reproduce
- Use a Windows user account with an accented character in the name (é, à, etc.)
- Install ESP32 core 3.1.0 or 3.1.1 via Board Manager
- Compile any sketch (even basic examples)
- Compilation fails immediately with panic
Notes
- This issue was not present in 3.0.7 and earlier.
- Likely related to newer tools based on Rust that do not handle UTF-8 paths properly under Windows.
Sketch
// the setup function runs once when you press reset or power the board
void setup() {
// initialize digital pin LED_BUILTIN as an output.
pinMode(LED_BUILTIN, OUTPUT);
}
// the loop function runs over and over again forever
void loop() {
digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}
Debug Message
thread 'main' panicked at 'assertion failed: (left != right) left: 0, right: 0: Failed to get path name. Error code: 3', main.rs:65:9 exit status 101
Other Steps to Reproduce
No response
I have checked existing issues, online documentation and the Troubleshooting Guide
- [x] I confirm I have checked existing issues, online documentation and Troubleshooting guide.
If you roll back the version to 3.0.7 does it compile properly ? AFAIK we don't have any tool that uses rust.
If you roll back the version to 3.0.7 does it compile properly ? AFAIK we don't have any tool that uses rust.
Yes, confirmed — 3.0.7 compiles without any issue using the same sketch and environment. The error only happens with 3.1.0, 3.1.1 and 3.1.2.
The crash message mentions main.rs:65:9 and a panic in thread 'main', which looks very similar to a Rust binary panic. Maybe it's not directly from your toolchain, but something being invoked during build?
I'm compiling using Arduino IDE 2.3.4 on Windows, and my username contains an accent (é).
I’ll provide detailed logs and a screenshot shortly.
The error comes from the GCC toolchain. We have reported it and will let you know when there is any result on it.
This issue was already fixed in commit https://github.com/espressif/esp-toolchain-bin-wrappers/commit/3ac9475f97c289c57e69baa39e837565c12d603b.
It is included in release of GCC 15.1 but IDF is still using 14.2. This will be fixed in Arduino once IDF updates to the new toolchain version.
@ericpommierfdj - Can you please confirm that this issue is solved with Arduino Core 3.3.0?
