A second release candidate for GCC 7.3 is available from ftp://gcc.gnu.org/pub/gcc/snapshots/7.3.0-RC-20180122/
and shortly its mirrors. It has been generated from SVN revision 256937. I have so far bootstrapped and tested the release candidate on x86_64-unknown-linux-gnu. Please test it and report any issues to bugzilla. If all goes well I'd like to release 7.3 on Thursday, January 25th.