Hi guys,

I have been trying to port the current druntime for microcontrollers (that very little RAM and flash memory). I have been using the 'ldc-build-runtime' tool and finally I managed to compile something that looks alright.

The problem is that I compiled the druntime with the flag 'BUILD_SHARED_LIBS=OFF' (as the microcontrollers don't work with dynamic libraries), and when I try to link the druntime with the application for the microcontroller, I get many errors about undefined references (references that would normally be present in those dynamic libraries). Few of them are:
- 'munmap'
- 'clock_gettime'
- `pthread_mutex_trylock'
etc.

Could you help me by telling me what libraries (and how) should I statically compile and link to the druntime? The microcontroller's CPU is an ARM Cortex-M4, and the libraries should be able to be compiled for this architecture.

Thank you so much!

On Monday, 19 October 2020 at 06:25:17 UTC, Severin Teona wrote:
>
> - 'munmap'
> - 'clock_gettime'
> - `pthread_mutex_trylock'
> etc.
>

These are typically calls found in a Unix system, Linux for example. In a microcontroller you will likely not support these at all except clock_gettime.

You need to dissect druntime a bit further to remove these and/or find a replacement that does the same thing.

On Monday, 19 October 2020 at 06:25:17 UTC, Severin Teona wrote:

> Could you help me by telling me what libraries (and how) should I statically compile and link to the druntime? The microcontroller's CPU is an ARM Cortex-M4, and the libraries should be able to be compiled for this architecture.
>
> Thank you so much!

Most probably they should be provided by your RTOS.

At least, FreeRTOS have project for implement Posix thread calls.