It is impossible to emerge the portage package when /var is mounted with 'noexec' option. The reason is /var/tmp/portage/portage-2.0.50-r8/work/portage-2.0.50-r8/src/sandbox-1.1/create-localdecls script. Reproducible: Always Steps to Reproduce: 1. mount /var with 'noexec' 2. 3.
You'd have a lot more problems than just portage... You could never run a 'configure' in this case... Nor could you run test cases for binaries and such. You can move this directory with the PORTAGE_TMPDIR.