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How to fix PlatformIO multiple definition of `WiFi' error

Problem:

When compiling your PlatformIO firmware, you see an error message like

linker_multiple_definition_error.txt
Linking .pio/build/d1_mini_lite/firmware.elf
/home/uli/.platformio/packages/toolchain-xtensa/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld: .pio/build/d1_mini_lite/libbc0/libWiFi.a(WiFi.cpp.o):(.bss.WiFi+0x0): multiple definition of `WiFi'; .pio/build/d1_mini_lite/libd39/libESP8266WiFi.a(ESP8266WiFi.cpp.o):(.bss.WiFi+0x0): first defined here
collect2: error: ld returned 1 exit status
*** [.pio/build/d1_mini_lite/firmware.elf] Error 1

Solution

Move WiFi in the lib_deps section in platformio.ini to the top of the list. Before the fix:

platformio_before.ini
lib_deps =
    ESP Async [email protected]
    [email protected]
    WiFi

After the fix:

platformio_after.ini
lib_deps =
    WiFi
    ESP Async [email protected]
    [email protected]

Now you need to completely remove the .pio folder from your project directory:

remove_pio_folder.sh
rm -rf .pio

After that, recompile your firmware.

Complete platformio.ini example after fixing the issue:

platformio_complete_example.ini
[env:d1_mini_lite]
platform = espressif8266
board = d1_mini_lite
framework = arduino
monitor_speed = 115200
lib_deps =
    WiFi
    ESP Async [email protected]
    [email protected]
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