How to use qsort in C file ; ERROR at link time

[benoitLecuppe]

Hello,
I'm currently customising "/micropython/ports/esp8266/esppwm.c" and i want to use qsort() from <stdlib.h>.

I have an error during link time :

build-GENERIC/esppwm.o: In function `pwm_dump':
esppwm.c:(.irom0.text+0x2b4): undefined reference to `qsort'
build-GENERIC/esppwm.o: In function `timetable_init':
/micropython/ports/esp8266/esppwm.c:253: undefined reference to `qsort'
make: *** [Makefile:214: build-GENERIC/firmware.elf] Error 1

I think I must add something into makefile to make it work but which one and how ?

Thanks for the help
Benoit (from France)

[jimmo]

and i want to use qsort() from <stdlib.h>.

We do not link against a libc on most platforms. See -nostdlib in the makefile.

This prevents accidentally increasing code size by using additional functions.

MicroPython provides an implementation of quicksort for sorting lists -- mp_obj_list_sort. You can see this being used for example in mp_help_print_modules to print the sorted list of built-in modules.

[benoitLecuppe]

Ok thank you, i will look -nostdlib.