Fails to compile in PlatformIO due to long path

Created by: manuelbl

The library fails to compile in PlatformIO with the below error message:

.pio\libdeps\nanoatmega328\ArduinoJson_ID64\src/ArduinoJson/Array/../Variant/../Misc/../Strings/../Memory/../Variant/../Polyfills/type_traits.hpp:9:45: fatal error: type_traits/integral_constant.hpp: No such file or directory

The problem only occurs on Windows and only if the PlatformIO project is in a location with long path name.

In my case, the project location C:\Users\SomeUser\Documents\PlatformIO\Projects\Nano-ArduinoJson worked while the path C:\Users\SomeUser\Documents\LongPathLongPathLongPath\LongPathLongPath\LongPathLongPath\Nano-ArduinoJson failed.

Note that PlatformIO downloads the library to a directory within the project directory and compiles it there. So the full include path to the include file becomes:

C:\Users\SomeUser\Documents\PlatformIO\Projects\Nano-ArduinoJson\.pio\libdeps\nanoatmega328\ArduinoJson_ID64\src/ArduinoJson/Array/../Variant/../Misc/../Strings/../Memory/../Variant/../Polyfills/type_traits.hpp

Even though a good part of the path length is caused by PlatformIO, it would seem that the ArduinoJson part ArduinoJson/Array/../Variant/../Misc/../Strings/../Memory/../Variant/../Polyfills has ample opportunity for improvement. At the same time, the cyclomatic complexity of the software would be reduced.

Workaround: Move the project to a location with a shorter path.

To reproduce use the below minimal PlatformIO project:

platformio.ini

[env:nanatmega328]
platform = atmelavr
board = nanoatmega328
framework = arduino
lib_deps =
    ArduinoJson

main.cpp

#include <Arduino.h>
#include "ArduinoJson.h"

void setup() {
}

void loop() {
}

Build log

> Executing task: C:\Users\SomeUser\.platformio\penv\Scripts\platformio.exe run <

Processing nanoatmega328 (platform: atmelavr; board: nanoatmega328; framework: arduino)
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/atmelavr/nanoatmega328.html
PLATFORM: Atmel AVR 1.15.0 > Arduino Nano ATmega328
HARDWARE: ATMEGA328P 16MHz, 2KB RAM, 30KB Flash
PACKAGES: toolchain-atmelavr 1.50400.190710 (5.4.0), framework-arduinoavr 4.1.1   
LDF: Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 9 compatible libraries
Scanning dependencies...    
Dependency Graph        
|-- <ArduinoJson> 6.11.3
Compiling .pio\build\nanoatmega328\src\main.cpp.o
Archiving .pio\build\nanoatmega328\libfad\libArduinoJson_ID64.a
Archiving .pio\build\nanoatmega328\libFrameworkArduinoVariant.a
Compiling .pio\build\nanoatmega328\FrameworkArduino\CDC.cpp.o
Compiling .pio\build\nanoatmega328\FrameworkArduino\HardwareSerial.cpp.o
Compiling .pio\build\nanoatmega328\FrameworkArduino\HardwareSerial0.cpp.o
Compiling .pio\build\nanoatmega328\FrameworkArduino\HardwareSerial1.cpp.o
Compiling .pio\build\nanoatmega328\FrameworkArduino\HardwareSerial2.cpp.o
In file included from .pio\libdeps\nanoatmega328\ArduinoJson_ID64\src/ArduinoJson/Array/../Variant/../Misc/../Strings/../Memory/../Variant/VariantSlot.hpp:8:0,
                 from .pio\libdeps\nanoatmega328\ArduinoJson_ID64\src/ArduinoJson/Array/../Variant/../Misc/../Strings/../Memory/MemoryPool.hpp:9,
                 from .pio\libdeps\nanoatmega328\ArduinoJson_ID64\src/ArduinoJson/Array/../Variant/../Misc/../Strings/StringAdapters.hpp:7,
                 from .pio\libdeps\nanoatmega328\ArduinoJson_ID64\src/ArduinoJson/Array/../Variant/../Misc/SerializedValue.hpp:7,
                 from .pio\libdeps\nanoatmega328\ArduinoJson_ID64\src/ArduinoJson/Array/../Variant/VariantData.hpp:7,
                 from .pio\libdeps\nanoatmega328\ArduinoJson_ID64\src/ArduinoJson/Array/ArrayRef.hpp:7,
                 from .pio\libdeps\nanoatmega328\ArduinoJson_ID64\src/ArduinoJson.hpp:17,
                 from .pio\libdeps\nanoatmega328\ArduinoJson_ID64\src/ArduinoJson.h:9,
                 from src\main.cpp:2:
.pio\libdeps\nanoatmega328\ArduinoJson_ID64\src/ArduinoJson/Array/../Variant/../Misc/../Strings/../Memory/../Variant/../Polyfills/type_traits.hpp:9:45: fatal error: type_traits/integral_constant.hpp: No such file or directory
compilation terminated.
C*ompiling .pio\build\nanoatmega328\FrameworkArduino\HardwareSerial3.cpp.o
** [.pio\build\nanoatmega328\src\main.cpp.o] Error 1
================================================================================== [ERROR] Took 1.65 seconds ==================================================================================
The terminal process terminated with exit code: 1