Compilation problems - I'm totally stuck!

Development Platforms
1

Hello!

I’m having a hard time compiling a project.

I’m getting the error:

.pio/build/dueUSB/src/M5.ino.cpp.o: In function `setup':
M5.ino.cpp:(.text.setup+0x14): undefined reference to `tmc5072_init(TMC5072TypeDef*, unsigned char, ConfigurationTypeDef*, long const*)'

that I do not understand because I can see in the verbose output that my library is being compiled:

arm-none-eabi-g++ -o .pio/build/dueUSB/src/M5.ino.cpp.o -c -fno-rtti -fno-exceptions -std=gnu++11 -fno-threadsafe-statics -Os -ffunction-sections -fdata-sections -Wall -mcpu=cortex-m3 -mthumb -nostdlib --param max-inline-insns-single=500 -DPLATFORMIO=50204 -D__SAM3X8E__ -DARDUINO_SAM_DUE -DARDUINO=10805 -DF_CPU=84000000L -DUSBCON -DUSB_VID=0x2341 -DUSB_PID=0x003E "-DUSB_PRODUCT=\"Arduino Due\"" -DUSB_MANUFACTURER=\"Arduino\" -DARDUINO_ARCH_SAM -Iinclude -Isrc -Ilib/TMC5072 -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/cores/arduino -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/system/libsam -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/system/CMSIS/CMSIS/Include -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/system/CMSIS/Device/ATMEL -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/variants/arduino_due_x src/M5.ino.cpp
arm-none-eabi-gcc -o .pio/build/dueUSB/lib011/TMC5072/TMC5072.c.o -c -std=gnu11 -Os -ffunction-sections -fdata-sections -Wall -mcpu=cortex-m3 -mthumb -nostdlib --param max-inline-insns-single=500 -DPLATFORMIO=50204 -D__SAM3X8E__ -DARDUINO_SAM_DUE -DARDUINO=10805 -DF_CPU=84000000L -DUSBCON -DUSB_VID=0x2341 -DUSB_PID=0x003E "-DUSB_PRODUCT=\"Arduino Due\"" -DUSB_MANUFACTURER=\"Arduino\" -DARDUINO_ARCH_SAM -Ilib/TMC5072 -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/cores/arduino -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/system/libsam -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/system/CMSIS/CMSIS/Include -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/system/CMSIS/Device/ATMEL -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/variants/arduino_due_x lib/TMC5072/TMC5072.c
arm-none-eabi-gcc -o .pio/build/dueUSB/lib011/TMC5072/helpers/CRC.c.o -c -std=gnu11 -Os -ffunction-sections -fdata-sections -Wall -mcpu=cortex-m3 -mthumb -nostdlib --param max-inline-insns-single=500 -DPLATFORMIO=50204 -D__SAM3X8E__ -DARDUINO_SAM_DUE -DARDUINO=10805 -DF_CPU=84000000L -DUSBCON -DUSB_VID=0x2341 -DUSB_PID=0x003E "-DUSB_PRODUCT=\"Arduino Due\"" -DUSB_MANUFACTURER=\"Arduino\" -DARDUINO_ARCH_SAM -Ilib/TMC5072 -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/cores/arduino -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/system/libsam -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/system/CMSIS/CMSIS/Include -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/system/CMSIS/Device/ATMEL -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/variants/arduino_due_x lib/TMC5072/helpers/CRC.c
arm-none-eabi-gcc -o .pio/build/dueUSB/lib011/TMC5072/helpers/Functions.c.o -c -std=gnu11 -Os -ffunction-sections -fdata-sections -Wall -mcpu=cortex-m3 -mthumb -nostdlib --param max-inline-insns-single=500 -DPLATFORMIO=50204 -D__SAM3X8E__ -DARDUINO_SAM_DUE -DARDUINO=10805 -DF_CPU=84000000L -DUSBCON -DUSB_VID=0x2341 -DUSB_PID=0x003E "-DUSB_PRODUCT=\"Arduino Due\"" -DUSB_MANUFACTURER=\"Arduino\" -DARDUINO_ARCH_SAM -Ilib/TMC5072 -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/cores/arduino -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/system/libsam -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/system/CMSIS/CMSIS/Include -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/system/CMSIS/Device/ATMEL -I/Users/thomasfeldmann/.platformio/packages/framework-arduino-sam/variants/arduino_due_x lib/TMC5072/helpers/Functions.c

The project is here:
https://www.dropbox.com/s/kbfgq4ejy79b989/pio-tmc5072.zip?dl=1

Where did I go wrong?

2

Using .c files from your .ino/.cpp files require that the header for TMC5072.c (TMC5072.h?) marks the function as extern "C". Otherwise C++ name-mangling will cause the function to not be found. See e.g. here. So, you did that, right?

3

Oh wow, thank you. That’s it. Renaming my .c to .cpp fixes everything. That was quite a time sink, and what a dumb one.

Have a great day!