SD and FS (SPIFFS) library naming collision

[pfabri]

Description

<FS.h> and <SD.h> can't both be used in a sketch because of a naming collision. The File type, for example, is declared by both libraries. Attempting to build the code below will throw an error:

Sketch

#include <Arduino.h>
#include <SD.h>
#include <FS.h>

void setup() {

}

void loop() {

}

Debug Messages

Compiling .pioenvs/d1_mini/src/main.o
In file included from src/main.cpp:8:0:

/.platformio/packages/framework-arduinoespressif8266/cores/esp8266/FS.h:133:11: error: 'File' is already declared in this scope
using fs::File;
^
*** [.pioenvs/d1_mini/src/main.o] Error 1

[luc-github]

Use #define FS_NO_GLOBALS before include FS
so you can use fs::File for SPIFFS and File for SD

[pfabri]

@luc-github Marvellous, it works, thank you!
For those interested in digging deeper: #issue112 - ESPAsyncWebServer

[Misiu]

@luc-github I was searching for solution to use ESPAsyncWebServer and SD card. Your solution works, thank Yo. However I think it is only temporary.
can both SPIFFS and SD have namespaces? fs:: for SPIFFS and sd:: for SD?
Also I found interesting thread: #4201
Would it solve problem with namespaces? If it would be same base File class then conflict should disappear.
Please correct me if I'm wrong.

[luc-github]

temporary solutions can exist for a long time ...