sci-libs/parmetis: major refactoring

1. Update to EAPI 7 and cmake.eclass
2. Unbundle sci-libs/metis
3. Remove IUSE=mpi - with METIS unbundled, settings USE=-mpi effectively
   turns this package into a metapackage
4. Add USE=fortran requirement to virtual/mpi - without it,
   libparmetis.so ends up with unresolved symbol MPI_Comm_f2c
5. CMakeFiles are now modified by patches rather than sed - the changes
   are entirely static so there is no need for the latter

Signed-off-by: Marek Szuba <marecki@gentoo.org>

3 files changed, 123 insertions, 0 deletions

diff --git a/sci-libs/parmetis/files/parmetis-4.0.3-01-cmake-paths.patch b/sci-libs/parmetis/files/parmetis-4.0.3-01-cmake-paths.patch
new file mode 100644
index 000000000000..cdff3c0ea490
--- /dev/null
+++ b/sci-libs/parmetis/files/parmetis-4.0.3-01-cmake-paths.patch
@@ -0,0 +1,37 @@
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -1,6 +1,8 @@
+ cmake_minimum_required(VERSION 2.8)
+ project(ParMETIS)
+ 
++include(GNUInstallDirs)
++
+ set(GKLIB_PATH METIS/GKlib CACHE PATH "path to GKlib")
+ set(METIS_PATH METIS CACHE PATH "path to METIS")
+ 
+@@ -36,7 +38,6 @@
+ add_subdirectory(${METIS_PATH}/libmetis ${CMAKE_BINARY_DIR}/libmetis)
+ add_subdirectory(include)
+ add_subdirectory(libparmetis)
+-add_subdirectory(programs)
+ 
+ # This is for testing during development and is not being distributed
+ #add_subdirectory(test)
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -1 +1 @@
+-install(FILES parmetis.h DESTINATION include)
+\ No newline at end of file
++install(FILES parmetis.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+--- a/libparmetis/CMakeLists.txt
++++ b/libparmetis/CMakeLists.txt
+@@ -9,6 +9,6 @@
+ set_target_properties(parmetis PROPERTIES LINK_FLAGS "${MPI_LINK_FLAGS}")
+ 
+ install(TARGETS parmetis
+-  LIBRARY DESTINATION lib
+-  RUNTIME DESTINATION lib
+-  ARCHIVE DESTINATION lib)
++  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
++  RUNTIME DESTINATION ${CMAKE_INSTALL_LIBDIR}
++  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
diff --git a/sci-libs/parmetis/files/parmetis-4.0.3-02-unbundle-metis.patch b/sci-libs/parmetis/files/parmetis-4.0.3-02-unbundle-metis.patch
new file mode 100644
index 000000000000..f4e04eb48a94
--- /dev/null
+++ b/sci-libs/parmetis/files/parmetis-4.0.3-02-unbundle-metis.patch
@@ -0,0 +1,10 @@
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -35,7 +35,6 @@
+ include_directories(${METIS_PATH}/include)
+ 
+ # List of directories that cmake will look for CMakeLists.txt
+-add_subdirectory(${METIS_PATH}/libmetis ${CMAKE_BINARY_DIR}/libmetis)
+ add_subdirectory(include)
+ add_subdirectory(libparmetis)
+ 
diff --git a/sci-libs/parmetis/parmetis-4.0.3-r2.ebuild b/sci-libs/parmetis/parmetis-4.0.3-r2.ebuild
new file mode 100644
index 000000000000..6d9599fec417
--- /dev/null
+++ b/sci-libs/parmetis/parmetis-4.0.3-r2.ebuild
@@ -0,0 +1,76 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit cmake toolchain-funcs
+
+DESCRIPTION="Parallel (MPI) unstructured graph partitioning library"
+HOMEPAGE="https://www-users.cs.umn.edu/~karypis/metis/parmetis/"
+SRC_URI="http://glaros.dtc.umn.edu/gkhome/fetch/sw/${PN}/${P}.tar.gz"
+
+LICENSE="all-rights-reserved"
+SLOT="0"
+KEYWORDS="~amd64 ~arm64 ~x86 ~amd64-linux ~x86-linux"
+IUSE="doc examples openmp pcre"
+RESTRICT="mirror bindist"
+
+DEPEND=">=sci-libs/metis-5.1.0-r5
+	virtual/mpi[fortran]
+	pcre? ( dev-libs/libpcre:= )"
+RDEPEND="${DEPEND}
+	!<sci-libs/metis-5.1.0-r5"
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-4.0.3-01-cmake-paths.patch
+	"${FILESDIR}"/${PN}-4.0.3-02-unbundle-metis.patch
+)
+
+pkg_setup() {
+	if [[ ${MERGE_TYPE} != binary ]]; then
+		use openmp && tc-check-openmp
+	fi
+}
+
+src_prepare() {
+	export CC=mpicc CXX=mpicxx
+	cmake_src_prepare
+}
+
+src_configure() {
+	local mycmakeargs=(
+		-DGKLIB_PATH="${S}/metis/GKlib"
+		-DGKRAND=ON
+		-DMETIS_PATH="${EPREFIX}/usr"
+		-DOPENMP=$(usex openmp)
+		-DPCRE=$(usex pcre)
+		-DSHARED=ON
+	)
+	cmake_src_configure
+}
+
+src_install() {
+	cmake_src_install
+
+	dodoc Changelog
+	use doc && dodoc manual/manual.pdf
+	if use examples; then
+		docinto examples
+		dodoc -r Graphs programs
+	fi
+
+	cat > ${PN}.pc <<-EOF
+		prefix=${EPREFIX}/usr
+		libdir=\${prefix}/$(get_libdir)
+		includedir=\${prefix}/include
+		Name: ${PN}
+		Description: ${DESCRIPTION}
+		Version: ${PV}
+		URL: ${HOMEPAGE}
+		Libs: -L\${libdir} -l${PN}
+		Cflags: -I\${includedir}/${PN}
+		Requires: metis
+	EOF
+	insinto /usr/$(get_libdir)/pkgconfig
+	doins ${PN}.pc
+}