sys-libs/libomp: Add hwloc support

sys-libs/libomp/libomp-9999.ebuild

@@ -18,13 +18,15 @@ EGIT_REPO_URI="http://llvm.org/git/openmp.git
 LICENSE="UoI-NCSA"
 SLOT="0"
 KEYWORDS=""
-IUSE="test"
+IUSE="hwloc test"
 
+RDEPEND="hwloc? ( sys-apps/hwloc:0= )"
 # tests:
 # - dev-python/lit provides the test runner
 # - sys-devel/llvm provide test utils (e.g. FileCheck)
 # - sys-devel/clang provides the compiler to run tests
-DEPEND="dev-lang/perl
+DEPEND="${RDEPEND}
+	dev-lang/perl
 	test? (
 		$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]')
 		sys-devel/llvm
@@ -43,6 +45,7 @@ multilib_src_configure() {
 	local libdir="$(get_libdir)"
 	local mycmakeargs=(
 		-DLIBOMP_LIBDIR_SUFFIX="${libdir#lib}"
+		-DLIBOMP_USE_HWLOC=$(usex hwloc)
 		# do not install libgomp.so & libiomp5.so aliases
 		-DLIBOMP_INSTALL_ALIASES=OFF
 		# disable unnecessary hack copying stuff back to srcdir

sys-libs/libomp/metadata.xml

@@ -8,5 +8,8 @@
 	<maintainer type="project">
 		<email>[email protected]</email>
 	</maintainer>
+	<use>
+		<flag name='hwloc'>Enable CPU affinity support via hwloc</flag>
+	</use>
 	<longdescription>The OpenMP subproject of LLVM is intended to contain all of the components required to build an executing OpenMP program that are outside the compiler itself.</longdescription>
 </pkgmetadata>