option(LIBUNWIND_ENABLE_CROSS_UNWINDING "Enable cross-platform unwinding support." OFF) Looks interesting. We should either enable it unconditionally or add a USE flag.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=82239d2f05f6b9a836d2fc53d5efbfd2fd68782a commit 82239d2f05f6b9a836d2fc53d5efbfd2fd68782a Author: Michał Górny <mgorny@gentoo.org> AuthorDate: 2018-01-20 09:33:52 +0000 Commit: Michał Górny <mgorny@gentoo.org> CommitDate: 2018-01-20 09:39:21 +0000 sys-libs/llvm-libunwind: Enable cross-unwinding support in 6+ Closes: https://bugs.gentoo.org/645046 sys-libs/llvm-libunwind/llvm-libunwind-6.0.9999.ebuild | 4 ++++ sys-libs/llvm-libunwind/llvm-libunwind-9999.ebuild | 4 ++++ 2 files changed, 8 insertions(+)