gentoo-overlay/sys-libs/libunwind/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<herd>toolchain</herd>
	<use>
		<flag name='debug-frame'>Adds support for DWARF .debug_frame section: Use the information from this section if available</flag>
		<flag name='libatomic'>Use libatomic instead of builtin atomic operations</flag>
	</use>
</pkgmetadata>