The second release candidate for GCC 5.1 is available from ftp://gcc.gnu.org/pub/gcc/snapshots/5.0.1-RC-20150418
and shortly its mirrors. It has been generated from SVN revision 222211. Because the release candidate uses 5.0.1 as its version (5.1.0 is reserved for the GA 5.1 release only, see https://gcc.gnu.org/develop.html#num_scheme ), I've used the 5.0.1 version in the name of the directory and tarballs this time, where the first release candidate used 5.1.0-RC-20150412. 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 5.1 on Wednesday, 22nd.