Multiple definition error in /addons header files

[dabecart]

The issue
I was having some trouble getting PlatformIO to compile for the ESP32 the user authentication example with mail and password. I was getting some "multiple definition" of some functions inside the library. I was a bit discouraged to find that, despite changing versions of the library, I'd still get the same error.

So, when I finally got to reading and understanding the error, determined to enter the library code, I found that the multiple definitions were on the same file and on the same line. How could it be that is multiply defined if it is defined only once?

My solution
I did a little digging and found out that to get rid of the compilation error you had to either move the code inside the .h files to a .cpp file or add an inline tag before the function.

Just did that in all methods inside RTDBHelper.h and TokenHelper.h and now it compiles.

My output
Linking .pio\build\esp32doit-devkit-v1\firmware.elf
c:/users/username/.platformio/packages/toolchain-xtensa-esp32/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: .pio\build\esp32doit-devkit-v1\src\main.cpp.o: in function getTokenType(token_info_t)': C:\Users\username\Documents\PlatformIO\Projects\RiegoAutomata_v2/.pio/libdeps/esp32doit-devkit-v1/Firebase Arduino Client Library for ESP8266 and ESP32/src/addons/TokenHelper.h:23: multiple definition of getTokenType(token_info_t)'; .pio\build\esp32doit-devkit-v1\src\FirebaseServer.cpp.o:C:\Users\username\Documents\PlatformIO\Projects\RiegoAutomata_v2/.pio/libdeps/esp32doit-devkit-v1/Firebase Arduino Client Library for ESP8266 and ESP32/src/addons/TokenHelper.h:23: first defined here
c:/users/username/.platformio/packages/toolchain-xtensa-esp32/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: .pio\build\esp32doit-devkit-v1\src\main.cpp.o: in function getTokenStatus(token_info_t)': C:\Users\username\Documents\PlatformIO\Projects\RiegoAutomata_v2/.pio/libdeps/esp32doit-devkit-v1/Firebase Arduino Client Library for ESP8266 and ESP32/src/addons/TokenHelper.h:49: multiple definition of getTokenStatus(token_info_t)'; .pio\build\esp32doit-devkit-v1\src\FirebaseServer.cpp.o:C:\Users\username\Documents\PlatformIO\Projects\RiegoAutomata_v2/.pio/libdeps/esp32doit-devkit-v1/Firebase Arduino Client Library for ESP8266 and ESP32/src/addons/TokenHelper.h:49: first defined here
c:/users/username/.platformio/packages/toolchain-xtensa-esp32/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: .pio\build\esp32doit-devkit-v1\src\main.cpp.o: in function getTokenError(token_info_t)': C:\Users\username\Documents\PlatformIO\Projects\RiegoAutomata_v2/.pio/libdeps/esp32doit-devkit-v1/Firebase Arduino Client Library for ESP8266 and ESP32/src/addons/TokenHelper.h:81: multiple definition of getTokenError(token_info_t)'; .pio\build\esp32doit-devkit-v1\src\FirebaseServer.cpp.o:C:\Users\username\Documents\PlatformIO\Projects\RiegoAutomata_v2/.pio/libdeps/esp32doit-devkit-v1/Firebase Arduino Client Library for ESP8266 and ESP32/src/addons/TokenHelper.h:81: first defined here
c:/users/username/.platformio/packages/toolchain-xtensa-esp32/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: .pio\build\esp32doit-devkit-v1\src\main.cpp.o: in function tokenStatusCallback(token_info_t)': C:\Users\username\Documents\PlatformIO\Projects\RiegoAutomata_v2/.pio/libdeps/esp32doit-devkit-v1/Firebase Arduino Client Library for ESP8266 and ESP32/src/addons/TokenHelper.h:90: multiple definition of tokenStatusCallback(token_info_t)'; .pio\build\esp32doit-devkit-v1\src\FirebaseServer.cpp.o:C:\Users\username\Documents\PlatformIO\Projects\RiegoAutomata_v2/.pio/libdeps/esp32doit-devkit-v1/Firebase Arduino Client Library for ESP8266 and ESP32/src/addons/TokenHelper.h:90: first defined here
c:/users/username/.platformio/packages/toolchain-xtensa-esp32/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: .pio\build\esp32doit-devkit-v1\src\main.cpp.o: in function printResult(FirebaseData&)': C:\Users\username\Documents\PlatformIO\Projects\RiegoAutomata_v2/.pio/libdeps/esp32doit-devkit-v1/Firebase Arduino Client Library for ESP8266 and ESP32/src/addons/RTDBHelper.h:25: multiple definition of printResult(FirebaseData&)'; .pio\build\esp32doit-devkit-v1\src\FirebaseServer.cpp.o:C:\Users\username\Documents\PlatformIO\Projects\RiegoAutomata_v2/.pio/libdeps/esp32doit-devkit-v1/Firebase Arduino Client Library for ESP8266 and ESP32/src/addons/RTDBHelper.h:25: first defined here
c:/users/username/.platformio/packages/toolchain-xtensa-esp32/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: .pio\build\esp32doit-devkit-v1\src\main.cpp.o: in function printResult(FirebaseStream&)': C:\Users\username\Documents\PlatformIO\Projects\RiegoAutomata_v2/.pio/libdeps/esp32doit-devkit-v1/Firebase Arduino Client Library for ESP8266 and ESP32/src/addons/RTDBHelper.h:133: multiple definition of printResult(FirebaseStream&)'; .pio\build\esp32doit-devkit-v1\src\FirebaseServer.cpp.o:C:\Users\username\Documents\PlatformIO\Projects\RiegoAutomata_v2/.pio/libdeps/esp32doit-devkit-v1/Firebase Arduino Client Library for ESP8266 and ESP32/src/addons/RTDBHelper.h:133: first defined here
collect2.exe: error: ld returned 1 exit status
*** [.pio\build\esp32doit-devkit-v1\firmware.elf] Error 1/

IDE and its version:

• PlatformIO 6.1.4
• ESP32 5.2.0.

Additional context
This is my first time writing an issue in GitHub. I'll see now if I can attach the fixed header files.

[mobizt]

The library developed using PlatformIO and intensively tested for years in Arduino IDE and PlatformIO.

You should not get any compilation error by installation library correctly in Arduino ESP8266 and ESP32 platforms.

The modification is not needed.

Reinstall the library normally using library manager and post any compilation error you get here.

[mobizt]

You should post in this discussion instead.

[dabecart]

I tried several times downloading from the IO library manager, using older versions too and still it failed everytime. Maybe it's my compiler. I just wanted to let everyone know this error in case they get the same message.

[mobizt]

The error message should not be the same as your first post because it is different case.

Otherwise, the PlatformIO version update issue.

If you ever installed this library in Global storage in PlatformIO version prior to v2.0.0 and you have updated the PlatformIO to v2.0.0 and later, the global library installation was not available, the sources files of old library version still be able to search by the library dependency finder (LDF), you needed to remove the library from folder C:\Users\<UserName>\.platformio\lib to prevent unexpected behavior when compile and run.

[wryte4me]

this is the problem I am encountering right now

[mobizt]

This library is deprecated, you should use the new library instead to get support.
https://github.com/mobizt/Firebase-ESP-Client?tab=readme-ov-file#were-moving-to-the-new-library