I am installing gentoo on my main system following Sakaki's EFI guide. I am on a phone and do not have much time, I took some pictures of the emerge, but I don't know how to get the logs on my phone to upload them. I can take more pictures if you want. I hope to update this post later with more info but I need to go, sorry I am new to bug reporting, I will update this later.
Please post your `emerge --info' output in a comment. Please attach the entire build log to this bug report.
I cannot reproduce when compiling in a stage-3 amd64 container.