The filename or extension is too long

[luftaquila]

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Describe the problem

In Windows, I cannot compile a sketch with a following error.

Used platform Version Path
esp32:esp32   2.0.14  C:\Users\LUFT-AQUILA\local\workspace\monolith\builder\toolchain\arduino\data\packages\esp32\hardware\esp32\2.0.14
Error during build: fork/exec C:\Users\LUFT-AQUILA\local\workspace\monolith\builder\toolchain\arduino\data\packages\esp32\tools\xtensa-esp32-elf-gcc\esp-2021r2-patch5-8.4.0/bin/xtensa-esp32-elf-g++.exe: The filename or extension is too long.

It seems like that xtensa-esp32-elf-g++.exe: The filename or extension is too long. is the problem.

I found some related issues #839 and #961.

I think this problem is fixed at around 0.14 according to the issues above, but I'm experiencing the problem in 0.34.

platform.local.txt at https://github.com/arduino/arduino-cli/issues/839#issuecomment-714525612 did not worked.

To reproduce

arduino-cli --config-file ./config/arduino-cli.yaml compile --board-options LoopCore=0 -e --fqbn esp32:esp32:esp32 -v ../device/telemetry/telemetry.ino

The default ESP32 example sketches instead of mine have same problem, too.

arduino-cli.yaml

board_manager:
  additional_urls:
  - https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
build_cache:
  compilations_before_purge: 10
  ttl: 720h0m0s
daemon:
  port: "50051"
directories:
  data: ./toolchain/arduino\data
  downloads: ./toolchain/arduino\downloads
  user: ./toolchain/arduino\user
library:
  enable_unsafe_install: false
logging:
  file: ""
  format: text
  level: info
metrics:
  addr: :9090
  enabled: true
output:
  no_color: false
sketch:
  always_export_binaries: false
updater:
  enable_notification: true

Expected behavior

A normal compilation as IDE does, instead of The filename or extension is too long error.

Arduino IDE 2.2.1 compile output

arduino-cli 0.34 compile output

Arduino CLI version

arduino-cli.exe Version: nightly-20231013 Commit: 3a2f9f1 Date: 2023-10-13T01:28:47Z

Operating system

Windows

Operating system version

Windows 11 Pro 22H2

Additional context

No response

Issue checklist

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

[luftaquila]

I found out that compile command length for the Generating function prototypes... was 32798 byte, which slightly exceeded 32768 Windows command length limit.

This was much longer than the IDE generates, which is 27206 bytes. And if I truncate all data path from both commands, there length were almost same(18671 for IDE, 18282 for arduino-cli). The major difference was just a data path length.

I moved the project directory directly under C:\ and it compiles normally.

BTW, I think this problem needs some robust solution instead of depending on absolute path length of directories.data config.

I didn't take a closer look at it, but I thought https://github.com/arduino/arduino-cli/issues/839#issuecomment-714525612 was a solution for diminishing commands length. But it didn't worked at all, including insert content directly into platform.txt.