aarch64 problems with gcc-8.3.0 -O2 compiler option

[mufti11]

hi,

On aarch64 white_dune (https://wdune.ourproject.org/) crashes when it is complied with gcc 8.3.0 with the -O2 option.
It works, whne it is complied with the -O1 option.

Dany ideas ?