With FEATURES=fail-clean, a dying "ebuild ..." command still seems to trigger removal of temporary files contrary to make.conf(5): "Both the ebuild(1) command and the noclean feature cause the fail-clean feature to be automatically disabled." Reproducible: Always Steps to Reproduce: 1. Add fail-clean to FEATURES. 2. Run ebuild ... on an ebuild that will die. Actual Results: The temporary directory is not present. Expected Results: The temporary directory should be present.
This appears to be user error. Apologies for the noise.