gcc 5.4 on ppc64el: segmentation fault compiling apt in xenial

This build of apt 1.2.14 for xenial in the apt 1.2 PPA failed:

https://launchpad.net/~deity/+archive/ubuntu/apt-1.2/+build/10472777

Relevant snippet:

/<<PKGBUILDDIR>>/apt-pkg/contrib/error.cc: In member function ‘void GlobalError::DumpErrors(std::ostream&, const GlobalError::MsgType&, const bool&)’:
/<<PKGBUILDDIR>>/apt-pkg/contrib/error.cc:224:1: internal compiler error: Segmentation fault
 }
 ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-5/README.Bugs> for instructions.
The bug is not reproducible, so it is likely a hardware or OS problem.

Since APT 1.2.12 built successfully in the main archive last month, I assume it's a regression from the 5.4 upload. I'll retry the build though, to catch other stuff. I attached the build log in case launchpad deletes it on a rety...