The thing to look for in the output you posted are the # of unexpected failures
, the rest is nice to know, but not that important.
The only time I see this is in the libmudflap tests section, which is mentioned in the gcc chapter:
A few unexpected failures cannot always be avoided. The GCC developers are usually aware of these issues, but have not resolved them yet. In particular, the libmudflap tests are known be particularly problematic as a result of a bug in GCC (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20003). Unless the test results are vastly different from those at the above URL, it is safe to continue.
It is probably safe to continue, but do check out the link that is mentioned in the above quote from the LFS book.
Hope this helps.