On ppc, glibc and musl have slightly different API for accessing registers in the mcontext_t struct, see https://www.openwall.com/lists/musl/2018/02/22/1 for the reasons behind the divergence. Because of this, sys-libs/libunwind currently doesn't compile on powerpc-gentoo-linux-musl (`error: 'mcontext_t' has no member named 'uc_regs'`). Upstream has an open issue about it here: https://github.com/libunwind/libunwind/issues/709 A patch exists to make it detect the libc at compile-time and use the musl API when necessary: https://github.com/libunwind/libunwind/pull/710 or https://git.openembedded.org/openembedded-core/tree/meta/recipes-support/libunwind/libunwind/0005-ppc32-Consider-ucontext-mismatches-between-glibc-and.patch Can we include this patch downstream to fix the incompatibility until upstream merges the open pull request? The repository is listed as “in need of new / additional maintainer”, so it might take a while. Reproducible: Always
