[LLVMdev] Whole program compile/link

[Alireza.Moshtaghi at microchip.com]

> We ran into to this. There is not any easy solution here. The
> optimizer does not know what not to destroy if the code generator
> introduces new uses after optimization phase.  One solution is to keep
> this support functions in native .a (archive file) and let native
> linker complete the final link stage to link in these support
> functions.
> 

This is exactly what we are doing for PIC16 port; 
Would it make sense that front-end (clang) had a way to know if such
operations are native or not; if not, it would generate calls to
appropriate standard intrinsic routine... 
These intrinsics can be implemented as .bc (to be linked by llvm-ld,
enabling further lto optimizations because these are standard intrinsics
and optimizers can know about them) or as target native file (to be
linked by native linker)

A.