On 31/05/17 14:33, John Pullen wrote: > On 31/05/2017 3:32 PM, Richard Earnshaw (lists) wrote: >> On 27/05/17 14:39, John Pullen wrote: >>> Hi all, >>> >>> I'm using the latest GCC 7.1 source which I've built locally for >>> aarch64. Everything works fine, but I'm running into issuses using LTO. >>> >>> Normally I compile our dynamic library with -ffixed-x18 and it works >>> fine, but with LTO enabled, register x18 is used in the output >>> assembler. >>> >>> Is there anyway to stop LTO from using certain registers? >>> >> >> Are you passing -ffixed-x18 to the link/lto step? >> >> R. >>> Cheers, >>> John. >>> >> >> > > Yea I tried that. > > It does create a different binary, as the size is different, but the x18 > register is still used. > Hmm, not sure then. Would need a test case to investigate. What about the library code? Was that also built with -ffixed-x18? Please file something in bugzilla if you think there's a problem. R.
