In src_configure, it is defined that for none-native ABIs, it only builds runtime, but in src_install it does an unconditional rm *.html independent from the ABI. So for none-native ABIs, this will fail due to missing html files. Simple fix: The rm call should also only be run for the native ABI.
This sounds like a portage-multilib bug, without any additional info.
This is an issue for any external tool that cross-compiles the package (like cross-toolchain, prefix and multilib-portage, check bug 711590 for ncurses as an example). I for myself and for multilib-portage can workaround this by setting COMPLETE_MULTILIB=yes in the environment. The easiest way to fix this for everyone (as docs should the the same for any target ABI) would be to use 'if multilib_is_native_abi; then rm "${ED}"/usr/share/doc/${PF}/*.html || die ; fi' to only remove the files when they are actually installed.
I believe the only way for this to happen is if src_install is invoked more than once. This would not happen under normal circumstances. Please attach a build log demonstrating the problem.
