PIO in VSCode doesn't find any libraries (including built-in ones)

Libraries
1

The error that appears is “cannot open source file "Arduino.h"”.

I’ve tried everything, from reloading the project, creating a new project and copying my code into it, and more, but nothing seems to work.

Edit - I forgot 2 things.
A. The problem is only present in one specific project.
B. My platformio.ini is -

[env:uno]
platform = atmelavr
board = uno
framework = arduino
lib_deps = enjoyneering/LiquidCrystal_I2C@^1.2.4
2
  • Where is this project located? Is something like OneDrive involved?*
  • What IDE is being used?
    • if it’s VSCode, what’s the content of the .vscode/c_cpp_properties.json file?
  • Does it compile using pio run or is it only a code completion error?
3

Thanks for replying.

  1. The project is located in OneDrive/Documents/PlatformIO/Projects, but so are all of the other projects, so that shouldn’t be a factor.
  2. The content of the c_cpp_properties file is
{
    "configurations": [
        {
            "name": "!!! WARNING !!! AUTO-GENERATED FILE, PLEASE DO NOT MODIFY IT AND USE https://docs.platformio.org/page/projectconf/section_env_build.html#build-flags"
        },
        {
            "name": "Win32",
            "includePath": [
                "C:/Users/shach/OneDrive/Documents/PlatformIO/Projects/LCD Display/include",
                "C:/Users/shach/OneDrive/Documents/PlatformIO/Projects/LCD Display/src",
                "C:/Users/shach/OneDrive/Documents/PlatformIO/Projects/LCD Display/.pio/libdeps/uno/LiquidCrystal_I2C/src",
                "C:/Users/shach/.platformio/packages/framework-arduino-avr/libraries/Wire/src",
                "C:/Users/shach/.platformio/packages/framework-arduino-avr/cores/arduino",
                "C:/Users/shach/.platformio/packages/framework-arduino-avr/variants/standard",
                "C:/Users/shach/OneDrive/Documents/PlatformIO/Projects/LCD Display/.pio/libdeps/uno/LiquidCrystalIO/src",
                "C:/Users/shach/.platformio/packages/framework-arduino-avr/libraries/EEPROM/src",
                "C:/Users/shach/.platformio/packages/framework-arduino-avr/libraries/HID/src",
                "C:/Users/shach/.platformio/packages/framework-arduino-avr/libraries/SPI/src",
                "C:/Users/shach/.platformio/packages/framework-arduino-avr/libraries/SoftwareSerial/src",
                "C:/Users/shach/.platformio/packages/tool-unity",
                ""
            ],
            "browse": {
                "limitSymbolsToIncludedHeaders": true,
                "path": [
                    "C:/Users/shach/OneDrive/Documents/PlatformIO/Projects/LCD Display/include",
                    "C:/Users/shach/OneDrive/Documents/PlatformIO/Projects/LCD Display/src",
                    "C:/Users/shach/OneDrive/Documents/PlatformIO/Projects/LCD Display/.pio/libdeps/uno/LiquidCrystal_I2C/src",
                    "C:/Users/shach/.platformio/packages/framework-arduino-avr/libraries/Wire/src",
                    "C:/Users/shach/.platformio/packages/framework-arduino-avr/cores/arduino",
                    "C:/Users/shach/.platformio/packages/framework-arduino-avr/variants/standard",
                    "C:/Users/shach/OneDrive/Documents/PlatformIO/Projects/LCD Display/.pio/libdeps/uno/LiquidCrystalIO/src",
                    "C:/Users/shach/.platformio/packages/framework-arduino-avr/libraries/EEPROM/src",
                    "C:/Users/shach/.platformio/packages/framework-arduino-avr/libraries/HID/src",
                    "C:/Users/shach/.platformio/packages/framework-arduino-avr/libraries/SPI/src",
                    "C:/Users/shach/.platformio/packages/framework-arduino-avr/libraries/SoftwareSerial/src",
                    "C:/Users/shach/.platformio/packages/tool-unity",
                    ""
                ]
            },
            "defines": [
                "PLATFORMIO=50000",
                "ARDUINO_AVR_UNO",
                "F_CPU=16000000L",
                "ARDUINO_ARCH_AVR",
                "ARDUINO=10808",
                "__AVR_ATmega328P__",
                ""
            ],
            "intelliSenseMode": "clang-x64",
            "cStandard": "c11",
            "cppStandard": "c++11",
            "compilerPath": "C:/Users/shach/.platformio/packages/toolchain-atmelavr/bin/avr-gcc.exe",
            "compilerArgs": [
                "-mmcu=atmega328p",
                ""
            ]
        }
    ],
    "version": 4
}
  1. I run it using the default PIO upload button, and I presume PIO run.
4

The c_cpp_properties.json looks valid to me. In the folder

does the Arduino.h file exist, as a sanity check?

Reverse-test: Does the problem go away when moving the project out of there and pushing the Rebuild IntelliSense index button?

5

The Arduino.h file does exist in this folder, but if I remove the project and press “rebuild IntelliSense index”, nothing changes. I even moved it back in to see if the terminal output is different, but it was the same.

6

I have similar problem after updating to 5.0. Adafruit libraries files and a few other .h files not found. Build fails. Once I specified relative path to those h files it compiled. I’m not sure how that interlibrary referencing works but looks like something is not working in it.
I use slightly modified version of GitHub - CODeRUS/GyverLampCpp: GyverLamp https://github.com/AlexGyver/GyverLamp fork

7

Could you remove C:/Users/shach/.platformio/packages/framework-arduino-avr and start building again? Restart VSCode.

8

Tried that but it didn’t help.
it’s easy to reproduce, just get zip with master branch code of GyverLampCpp and try compiling it.
thank you
Ihor

9

Author of that project totally disabled Library Dependency Finder, as result, PlatformIO does not see all dependencies. See my PR:

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