I've been getting similar error messages when building a couple
of packages, they are:

/tmp/ccRFnumn.s: Assembler messages:
/tmp/ccRFnumn.s:679: Error: Branch out of range
/tmp/ccRFnumn.s:1490: Error: Branch out of range

After talking with some people who had similar problems, it was
suggested the possibility of the existence of a GNU compiler bug.
Is anybody aware of that? If so, is there a fixed version of the
compiler? Thanks in advance.

Dan