I believe this was boiled down to a bug in sun's cc's optimizer. I will try to find our records.
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via perlbug: queue: perl5 status: open
https://rt.perl.org:443/rt3/Ticket/Display.html?id=80782
[perl #80782] 64bit Perl with -Dvendorprefix cause Module::Build and similar to segfault on Solaris using Sun Studio
by Ricardo SIGNES via RT