Created attachment 850372 [details]
enabling static-libs on llvm-libunwind fixed the build failure with static and the build also didnt fail without the static use flag
-flto=thin was disabled for busybox with package.env but didnt result in any changes
Created attachment 850374 [details]
busybox build log
steps to reproduce after stage3 unpack
1 - emerge-webrsync
2 - add -pam and static useflags to sys-apps/busybox
3 - emerge busybox
4 - fails
forgot to say stricter use flag on clang was enabled
I hit this today also but with strict off being the only difference.
I've fixed bug 892956 so this should be sorted now.