ejpcmac[m]: > <@jpc:ejpcmac.net> > L6123E: LTO bitcode in <objname> was generated by an incompatible version of armclang
> >
> > You have attempted to link objects containing bitcode for Link-Time Optimization (LTO) that were created by different versions of the compiler. Any objects or libraries created for LTO must all be compiled and linked with the same Arm® Compiler for Embedded version. 

ah. it seems like you are out of luck unless you're willing to do some horrific hacks