Hi Steve, Any chance you'd be willing to dig into the gcc optimization delta between -O1 and -O2 to determine exactly which optimization causes the SVD failure on recent OS X systems? You'd have to dig up a version-specific set of GCC documentation, but the details should look something like http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html.
It would be nice to either a) report the problem upstream and/or b) disable this specific optimization at the smallest possible scope when detecting OS X along with issuing a compiler warning. - Rhys
