The second release candidate for GCC 15.1 is available from https://gcc.gnu.org/pub/gcc/snapshots/15.1.0-RC-20250423/ ftp://gcc.gnu.org/pub/gcc/snapshots/15.1.0-RC-20250423/
and shortly its mirrors. It has been generated from git commit r15-9577-g3483a2b39591db06. 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 15.1 on Friday, April 25th.