Created attachment 849778 [details]
sys-process/tini[static] build.log without sys-libs/llvm-libunwind[static-libs]
When building app-containers/docker on a Musl-LLVM system, sys-process/tini (which must be build with +static per Docker's ebuild requirements, at least with +container-init) fails to build unless sys-libs/llvm-libunwind is built with +static-libs. That USE dependency should be marked in tini's ebuild.
I have not tested against the other libunwind to know if the same fix applies there, but I assume it would. If there's a metapackage that controls libunwind (since the two implementations are mutually exclusive by RDEPS), the fix should probably be made there; I haven't looked into those ebuilds yet.
build.log of the failure attached. After oneshotting llvm-libunwind +static-libs, oneshotting tini works, and I can get back to building Docker.
*** This bug has been marked as a duplicate of bug 892956 ***