[LLVMdev] GCC/LLVM frame pointer incompatibility on ARM

[Yury Gribov]

Hi all,

As has been mentioned several times (*), LLVM and GCC setup frame 
pointer to point to different stack slots on ARM. GCC's fp points to 
stack slot holding lr while LLVM's fp points at the next slot.

Fp incompatibility complicates low-level system code e.g. stack 
unwinders because it is impossible to robustly determine location of 
caller's fp.

Is this incompatibility intentional/desired or we could somehow unify 
GCC and LLVM in this regard?

(*) Links to older discussions:
* http://comments.gmane.org/gmane.comp.compilers.llvm.devel/69514
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61771

--
Best regards,
Yury Gribov