I also noticed this Asm-related thing at the end of the log:
kBuild: Linking tstAsmStructsRC
FreeBSD clang version 8.0.1 (tags/RELEASE_801/final 366581) (based on LLVM 8.0.1)
Is that normal under amd64 ?
Full Poudriere log:
Looks like this is the same issue as bug 246910, for what it's worth.
(In reply to Eric Rucker from comment #2)
Thank you for the information Eric, I had not seen Bug 246910!
*** This bug has been marked as a duplicate of bug 246910 ***