I was unable to turn on some of the features in mpconfigport.h, such as MICROPY_PY_SYS_STDFILES, MICROPY_PY_MATH_SPECIAL_FUNCTIONS, MICROPY_PY_IO_FILEIO and MICROPY_PY_MACHINE_SPI, as make would fail with those features on (nRF port).

Below are the error messages:

• Error when #define MICROPY_PY_SYS_STDFILES (1):

LINK build-pca10040-s132/firmware.elf
/usr/local/bin/../lib/gcc/arm-none-eabi/8.3.1/../../../../arm-none-eabi/bin/ld: /tmp/ccCsRh6Z.ltrans2.ltrans.o: in function `mp_sys_print_exception.lto_priv.992':
/mnt/c/Users/sebi/Documents/TINKERING/MicroPython/FORKS/micropython/ports/nrf/../../py/modsys.c:110: undefined reference to `mp_sys_stdout_obj'
/usr/local/bin/../lib/gcc/arm-none-eabi/8.3.1/../../../../arm-none-eabi/bin/ld: /tmp/ccCsRh6Z.ltrans2.ltrans.o:(.rodata+0xb4): undefined reference to `mp_sys_stdout_obj'
/usr/local/bin/../lib/gcc/arm-none-eabi/8.3.1/../../../../arm-none-eabi/bin/ld: /tmp/ccCsRh6Z.ltrans2.ltrans.o:(.rodata+0x1c8): undefined reference to `mp_sys_stdout_obj'
/usr/local/bin/../lib/gcc/arm-none-eabi/8.3.1/../../../../arm-none-eabi/bin/ld: /tmp/ccCsRh6Z.ltrans2.ltrans.o:(.rodata+0x246c): undefined reference to `mp_sys_stdin_obj'
/usr/local/bin/../lib/gcc/arm-none-eabi/8.3.1/../../../../arm-none-eabi/bin/ld: /tmp/ccCsRh6Z.ltrans2.ltrans.o:(.rodata+0x2474): undefined reference to `mp_sys_stdout_obj'
/usr/local/bin/../lib/gcc/arm-none-eabi/8.3.1/../../../../arm-none-eabi/bin/ld: /tmp/ccCsRh6Z.ltrans2.ltrans.o:(.rodata+0x247c): undefined reference to `mp_sys_stderr_obj'
collect2: error: ld returned 1 exit status
make: *** [Makefile:344: build-pca10040-s132/firmware.elf] Error 1

• Error when #define MICROPY_PY_MATH_SPECIAL_FUNCTIONS (1)

CC build-pca10040-s132/pins_gen.c
LINK build-pca10040-s132/firmware.elf
/usr/local/bin/../lib/gcc/arm-none-eabi/8.3.1/../../../../arm-none-eabi/bin/ld: /tmp/cchaRFoM.ltrans2.ltrans.o: in function `mp_math_lgamma.lto_priv.1007':
/mnt/c/Users/sebi/Documents/TINKERING/MicroPython/FORKS/micropython/ports/nrf/../../py/modmath.c:170: undefined reference to `lgammaf'
/usr/local/bin/../lib/gcc/arm-none-eabi/8.3.1/../../../../arm-none-eabi/bin/ld: /tmp/cchaRFoM.ltrans2.ltrans.o: in function `mp_math_gamma.lto_priv.1006':
/mnt/c/Users/sebi/Documents/TINKERING/MicroPython/FORKS/micropython/ports/nrf/../../py/modmath.c:168: undefined reference to `tgammaf'
/usr/local/bin/../lib/gcc/arm-none-eabi/8.3.1/../../../../arm-none-eabi/bin/ld: /tmp/cchaRFoM.ltrans2.ltrans.o: in function `mp_math_erfc.lto_priv.1005':
/mnt/c/Users/sebi/Documents/TINKERING/MicroPython/FORKS/micropython/ports/nrf/../../py/modmath.c:166: undefined reference to `erfcf'
/usr/local/bin/../lib/gcc/arm-none-eabi/8.3.1/../../../../arm-none-eabi/bin/ld: /tmp/cchaRFoM.ltrans2.ltrans.o: in function `mp_math_erf.lto_priv.1004':
/mnt/c/Users/sebi/Documents/TINKERING/MicroPython/FORKS/micropython/ports/nrf/../../py/modmath.c:164: undefined reference to `erff'
/usr/local/bin/../lib/gcc/arm-none-eabi/8.3.1/../../../../arm-none-eabi/bin/ld: /tmp/cchaRFoM.ltrans2.ltrans.o: in function `mp_math_atanh.lto_priv.982':
/mnt/c/Users/sebi/Documents/TINKERING/MicroPython/FORKS/micropython/ports/nrf/../../py/modmath.c:120: undefined reference to `atanhf'
/usr/local/bin/../lib/gcc/arm-none-eabi/8.3.1/../../../../arm-none-eabi/bin/ld: /tmp/cchaRFoM.ltrans2.ltrans.o: in function `mp_math_asinh.lto_priv.981':
/mnt/c/Users/sebi/Documents/TINKERING/MicroPython/FORKS/micropython/ports/nrf/../../py/modmath.c:118: undefined reference to `asinhf'
/usr/local/bin/../lib/gcc/arm-none-eabi/8.3.1/../../../../arm-none-eabi/bin/ld: /tmp/cchaRFoM.ltrans2.ltrans.o: in function `mp_math_acosh.lto_priv.980':
/mnt/c/Users/sebi/Documents/TINKERING/MicroPython/FORKS/micropython/ports/nrf/../../py/modmath.c:116: undefined reference to `acoshf'
/usr/local/bin/../lib/gcc/arm-none-eabi/8.3.1/../../../../arm-none-eabi/bin/ld: /tmp/cchaRFoM.ltrans2.ltrans.o: in function `mp_math_log2.lto_priv.975':
/mnt/c/Users/sebi/Documents/TINKERING/MicroPython/FORKS/micropython/ports/nrf/../../py/modmath.c:106: undefined reference to `log2f'
collect2: error: ld returned 1 exit status
make: *** [Makefile:344: build-pca10040-s132/firmware.elf] Error 1

• Error when #define MICROPY_PY_IO_FILEIO (1)

LINK build-pca10040-s132/firmware.elf
/usr/local/bin/../lib/gcc/arm-none-eabi/8.3.1/../../../../arm-none-eabi/bin/ld: /tmp/ccKalfRU.ltrans2.ltrans.o:(.rodata+0x25fc): undefined reference to `fatfs_type_fileio'
/usr/local/bin/../lib/gcc/arm-none-eabi/8.3.1/../../../../arm-none-eabi/bin/ld: /tmp/ccKalfRU.ltrans2.ltrans.o:(.rodata+0x2604): undefined reference to `fatfs_type_textio'
collect2: error: ld returned 1 exit status
make: *** [Makefile:344: build-pca10040-s132/firmware.elf] Error 1

• Error when #define MICROPY_PY_MACHINE_SPI (1):

CC ../../extmod/machine_spi.c
../../extmod/machine_spi.c: In function 'mp_machine_soft_spi_print':
../../extmod/machine_spi.c:175:67: error: expected ')' before 'MP_HAL_PIN_FMT'
     mp_printf(print, "SoftSPI(baudrate=%u, polarity=%u, phase=%u,"
                                                                   ^
                                                                   )
         " sck=" MP_HAL_PIN_FMT ", mosi=" MP_HAL_PIN_FMT ", miso=" MP_HAL_PIN_FMT ")",
                 ~~~~~~~~~~~~~~
../../extmod/machine_spi.c:174:32: error: unused variable 'self' [-Werror=unused-variable]
     mp_machine_soft_spi_obj_t *self = MP_OBJ_TO_PTR(self_in);
                                ^~~~
At top level:
../../extmod/machine_spi.c:146:17: error: 'baudrate_from_delay_half' defined but not used [-Werror=unused-function]
 STATIC uint32_t baudrate_from_delay_half(uint32_t delay_half) {
                 ^~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make: *** [../../py/mkrules.mk:47: build-pca10040-s132/extmod/machine_spi.o] Error 1