LTO & aarch64

[John Pullen]

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.

Cheers,
John.