Failing build: multiple definition of `hal_init'

[gkaretka]

Hello, I'm building this project with these libraries for heltec_wireless_stick board.

Dependency Graph

• |-- <U8g2> 2.33.2
• | |-- <SPI> 2.0.0
• | |-- <Wire> 2.0.0
• |-- <EasyLed> 1.1.0
• |-- <MCCI LoRaWAN LMIC library> 4.0.0
• | |-- <SPI> 2.0.0
• |-- <Wire> 2.0.0
• |-- <SPI> 2.0.0
  `
  Building in release mode

and I am getting this error message
Linking .pio\build\heltec_wireless_stick\firmware.elf c:/users/xxx/.platformio/packages/toolchain-xtensa-esp32/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\xxx\.platformio\packages\framework-arduinoespressif32\tools\sdk\esp32\lib\libpp.a(hal_mac.o): in functionhal_init':
(.text.hal_init+0xc8): multiple definition of hal_init'; .pio\build\heltec_wireless_stick\libc40\libMCCI LoRaWAN LMIC library.a(hal.cpp.o):C:\Users\xxx\Documents\GitHub\LMIC-node/.pio/libdeps/heltec_wireless_stick/MCCI LoRaWAN LMIC library/src/hal/hal.cpp:416: first defined here collect2.exe: error: ld returned 1 exit status *** [.pio\build\heltec_wireless_stick\firmware.elf] Error 1

[JohnMacrae]

You can solve this by using v3.5.0 of the espressif 32 platform. Although not a permanent fix, it will get you going. N.B. you will need to uninstall espressif 32 completely and then reinstall 3.5.0. HTH

[Manwil00]

Hello,

I had the same issue using a TTGO LoRa32 v2.1 board

It seems to be related to the MCCI LoRaWAN LMIC Library https://github.com/mcci-catena/arduino-lmic and ESP32 based boards.
The same github issue exists on their github page: mcci-catena/arduino-lmic#714
They suggests adding #define hal_init LMICHAL_init to the lmic_project_config.h or if using PlatformIO to the command line.
mcci-catena/arduino-lmic#714 (comment)

So I got it working by adding -D hal_init=LMICHAL_init to the mcci_lmic build_flags in the platformio.ini file

[lnlp]

Thanks! @CaptnAwsome and @JohnMacrae

I have added the workaround to LMIC-node and will therefore close this issue.