gentoo-overlay/sys-devel/clang-runtime/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<maintainer type="project">
		<email>llvm@gentoo.org</email>
	</maintainer>
	<use>
		<flag name="compiler-rt">Install <pkg>sys-libs/compiler-rt</pkg> for -rtlib=compiler-rt</flag>
		<flag name="libcxx">Install <pkg>sys-libs/libcxx</pkg> for -stdlib=libc++</flag>
		<flag name="openmp">Install <pkg>sys-libs/libomp</pkg> for -fopenmp support</flag>
		<flag name="sanitize">Enable compiler-rt sanitizer (-fsanitize*) support</flag>
	</use>
</pkgmetadata>