Hi @Honza0297 ! Could you please put together a minimal example to reproduce the issue?

Certainly, however, during the preparation of the minimal example, I managed to build the project, with absolutely no change of anything. After I cleaned the project (General -> Clean), I am now unable to build it again. I'll dig deeper what changed (something had to) and provide you additional info.

I somehow forgot to provide version info etc, may be helpful:
OS: Fedora Silverblue
VSCode version 1.54.3 (flatpak)
Platformio home: 3.3.4
Platformio core: 5.1.1

Anyway, I found out what causes the error. My home directory (/home/jaberan) is a symlink to /var/home/jaberan. Sometimes, Platformio/cmake detects my $HOME prefix (or how to call that) as a /home (does not work), sometimes as a /var/home (works). The difference is present in CMakeFIles folder located in .pio/build/esp32dev.
Here is my project repository (simple program which gets temperature from ds18b20 temperature sensor and prints it to Serial line). Branch "broken" contains broken version, branch "working" contains working version. https://github.com/Honza0297/TOIcv1 EDIT: Unfortunately it depends on my local settings, so it won't work anywhere else.
I am not sure if this information is somehow useful, but there is nothing more I could find.

Update: After a little experimenting, I found out I can avoid the error by setting $HOME to "/var/home/jaberan" instead of "/home/jaberan". Then, I am able to create and compile working application. Not sure why PlatformIO (or esp-idf?) doesn't like my simlinked home...

This bug is also easily reproducable in a Windows portable environment:

• unpack current 64 bit zip version of vscode to d:\pTEST

> mkdir d:\pTEST\data\tmp
> set PLATFORMIO_CORE_DIR=d:\pTEST\data\extensions\.platformio
> code

• From the marketplace install platformio
• After restarting, in PIO home make a new project:
  -- Board AZ-Delivery ESP-32 Dev Kit C V4
  -- Framework: Espressif IoT Dev. FW
  -- Custom project location somewhere on the D:

After having downloaded everything, the project wizard fails with that error:

*** Multiple ways to build the same target were specified for: D:\ESPFAIL\.pio\build\az-delivery-devkit-v4\esp_efuse_api.o  (from ['D:\\pTEST\\data\\extensions\\.platformio\\packages\\framework-espidf\\components\\efuse\\src\\esp32\\esp_efuse_api.c'] and from ['D:\\pTEST\\data\\extensions\\.platformio\\packages\\framework-espidf\\components\\efuse\\src\\esp_efuse_api.c'])  
File "D:\pTEST\data\extensions\.platformio\platforms\espressif32\builder\frameworks\espidf.py", line 620, in compile_source_files

Cleaning the project and rebuilding doesn't help. The same error rises after "Reading CMake configuration..."

However, it's working when you do the steps above omitting PLATFORMIO_CORE_DIR and let install everything in the user's homedirectory. Of course, on AD enabled machines with folder redirection, this is not an option.

VSCode:1.64.2
PIO: Core 5.2.5, Home: 3.4.1

Regards,
Chris

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Same here. My home dir is a symlink to another directory on another ext4 partition, and I had to set $HOME to the symlink target in order to solve the issue.

I am having a similar issue as described here, my .platformio dir is a symlink to another OSX account. I cannot set my home directory to the symlink target as I don't want to affect other things.

Same problem here with a symlinked .platformio

In case you are using the Flatpak version of VS Code on Fedora Silverblue or Kinoite, run the following command and restart VS Code:

flatpak override --user "--env=HOME=/var/home/$USER" com.visualstudio.code

This builds upon the discovery of @Honza0297 that PlatformIO apparently doesn't like symlinked home directories:

Update: After a little experimenting, I found out I can avoid the error by setting $HOME to "/var/home/jaberan" instead of "/home/jaberan". Then, I am able to create and compile working application. Not sure why PlatformIO (or esp-idf?) doesn't like my simlinked home...