1.
As title.
and what time I need to add options ?
I know add --specs=nano.specs thas is mean using newlib-nano when I use arm-none-eabi-gcc.
In readme, rdimon is for semihosting. Nosys is for retarget.
We use bare metal system and printf retarget to AXI port. What option I need to select ?
2. Does newlib support reentrant in arm-none-eabi-gcc?
Newlib provide two version function first is usual name . Second is reentrant version "_xxx_r"
How to choose the function when compile my code? Or I don't need know that.
Ex : _write_r , write
3. Are both of two function target to _write?
I implement _write function will retarget printf.
I not sure printf will call which function. _write_r , write, _write