The second release candidate for GCC 13.1 is available from https://gcc.gnu.org/pub/gcc/snapshots/13.1.0-RC2-20230419/ ftp://gcc.gnu.org/pub/gcc/snapshots/13.1.0-RC2-20230419/
and shortly its mirrors. It has been generated from git commit r13-7226-g68997d4323cdcb. The https://gcc.gnu.org/PR108969 fix didn't work out as intended, so we had to revert the changes. Please don't use the first GCC 13.1 release candidate for anything, it contains symbols 13.1 final release will not contain. I have so far bootstrapped and tested the release candidate on x86_64-linux. Please test it and report any issues to bugzilla. If all goes well, we'd still like to release 13.1 on Wednesday, April 26th.