The first release candidate for GCC 8.5 is available from https://gcc.gnu.org/pub/gcc/snapshots/8.5.0-RC-20210507/ ftp://gcc.gnu.org/pub/gcc/snapshots/8.5.0-RC-20210507
and shortly its mirrors. It has been generated from git revision r8-10959-g3488242b9a949ebc55b4a857380f94506f90ff76. I have so far bootstrapped and tested the release candidate on x86_64-linux and i686-linux. Please test it and report any issues to bugzilla. If all goes well, I'd like to release 8.5 on Friday, May 14th.