Swift for bare-metal/RTOS based microcontroller

[IOOI (Lars Sonchocky-Helldorf)]

Hi @andyliu, have you seen these posts on the topic:

Swift in bare-metal embedded programming/Swift runtime

Even if you take care not to create class instances, the compiler emits many calls to runtime functions to implement features such as generics, casts and existentials. It is possible to write code where a large number of runtime calls are optimized away, but I don’t think they can be eliminated completely. If anyone is interested in taking this on as a community project, it would be a fair amount of work, but I think the first step could be to add compiler flags where calls to runtime functions…

and

Embedded Swift - supporting Cortex M architecture

Hi This is a general suggestion, but one I’ve pondered about for quite a long time. In short, it would be great if the Swift compiler could target embedded systems, and specifically the ARM Cortex M4 architecture (or later). Rationale: To date, Swift is ported to x86 and ARM Cortex A architectures (and there may be others in the pipeline) There are billions of low-power devices out there running "single process - multithreaded applications" on ARM Cortex M class devices (https://en.wikipedi…