Undefined references in Druntime for microcontrollers

[Severin Teona]

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!