dev-lang/nqp: revbump 2016.04-r3

- enabled proper use of jna:4 (by Chewi)
- using multibuild.eclass to enable custom java install procedure
- minor qa corrections
- warn before installation with NQP and Rakudo present
- drop system-libs use-flag (from ebuilds and metadata.xml)

dev-lang/nqp/metadata.xml

@@ -16,7 +16,6 @@
   <use>
     <flag name="clang">Toggle usage of the clang compiler in conjunction with MoarVM</flag>
     <flag name="moar">Build the MoarVM backend (experimental/broken)</flag>
-    <flag name="system-libs">Use jars provided by the system instead of upstream</flag>
   </use>
   <upstream>
     <remote-id type="github">perl6/nqp</remote-id>

dev-lang/nqp/nqp-2016.04-r3.ebuild

@@ -0,0 +1,161 @@
+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI=5
+
+inherit java-pkg-opt-2 multibuild
+
+if [[ ${PV} == "9999" ]]; then
+	EGIT_REPO_URI="https://github.com/perl6/${PN}.git"
+	inherit git-r3
+	KEYWORDS=""
+else
+	SRC_URI="https://github.com/perl6/${PN}/tarball/${PV} -> ${P}.tar.gz"
+	inherit vcs-snapshot
+	KEYWORDS="~amd64 ~x86"
+fi
+
+DESCRIPTION="Not Quite Perl, a Perl 6 bootstrapping compiler"
+HOMEPAGE="http://rakudo.org/"
+
+LICENSE="Artistic-2"
+SLOT="0"
+IUSE="doc clang java +moar test"
+REQUIRED_USE="|| ( java moar )"
+
+CDEPEND="java? (
+		dev-java/asm:4
+		dev-java/jline:0
+		dev-java/jna:4
+	)
+	moar? ( ~dev-lang/moarvm-${PV}[clang=] )"
+RDEPEND="${CDEPEND}
+	java? ( >=virtual/jre-1.7 )"
+DEPEND="${CDEPEND}
+	clang? ( sys-devel/clang )
+	java? ( >=virtual/jdk-1.7 )
+	dev-lang/perl"
+PATCHES=( "${FILESDIR}/enable-external-jars.patch" )
+
+pkg_pretend() {
+	if has_version dev-lang/rakudo || has_version dev-lang/nqp; then
+		ewarn "NQP is known to fail compilation/installation with Rakudo and/or NQP"
+		ewarn "already being installed. So if it fails, try uninstalling both"
+		ewarn "dev-lang/nqp and dev-lang/rakudo, then do a new installation."
+		ewarn "(see Bug #584394)"
+	fi
+}
+
+java_prepare() {
+	# Don't clean stage0 jars.
+	einfo "Cleaning upstream jars"
+	java-pkg_clean 3rdparty/
+
+	# Don't use jars we just deleted.
+	sed -i -r 's/(:3rdparty[^:]*)+/:${THIRDPARTY_JARS}/g' \
+		src/vm/jvm/runners/nqp-j || die
+}
+
+src_prepare() {
+	MULTIBUILD_VARIANTS=()
+	use moar && MULTIBUILD_VARIANTS+=( moar )
+	use java && MULTIBUILD_VARIANTS+=( jvm )
+
+	multibuild_copy_sources
+
+	# This will pull in conditional java_prepare
+	default
+}
+
+nqp_configure() {
+	pushd "${BUILD_DIR}" > /dev/null || die
+	local myconfargs=(
+		"--backend=${MULTIBUILD_VARIANT}"
+		"--prefix=/usr" )
+
+	perl Configure.pl "${myconfargs[@]}" || die
+	popd || die
+}
+
+nqp_compile() {
+	if [[ "${MULTIBUILD_VARIANT}" = jvm ]]; then
+		emake -j1 \
+			-C "${BUILD_DIR}" \
+			THIRDPARTY_JARS=$(java-pkg_getjars --with-dependencies asm-4,jline,jna-4) \
+			JAVAC="$(java-pkg_get-javac) $(java-pkg_javac-args)"
+	elif [[ "${MULTIBUILD_VARIANT}" = moar ]]; then
+		emake -j1 \
+			-C "${BUILD_DIR}"
+	fi
+}
+
+nqp_test() {
+	emake -j1 \
+		-C "${BUILD_DIR}" \
+		test
+}
+
+nqp_install() {
+	# This is the actual reason we need multibuild.eclass.
+	# We need to distinguish the install procedure for MoarVM and JVM backends.
+	case "${MULTIBUILD_VARIANT}" in
+		moar)
+			emake \
+				DESTDIR="${ED}" \
+				-C "${BUILD_DIR}" \
+				install
+			;;
+		jvm)
+			pushd "${BUILD_DIR}" > /dev/null || die
+			# Set JAVA_PKG_JARDEST early.
+			java-pkg_init_paths_
+
+			# Upstream sets the classpath to this location. Perhaps it's
+			# used to locate the additional libraries?
+			java-pkg_addcp "${JAVA_PKG_JARDEST}"
+
+			insinto "${JAVA_PKG_JARDEST}"
+			local jar
+
+			for jar in *.jar; do
+				if has ${jar} ${PN}.jar ${PN}-runtime.jar; then
+					# jars for NQP itself.
+					java-pkg_dojar ${jar}
+				else
+					# jars used by NQP.
+					doins ${jar}
+				fi
+			done
+
+			# Upstream uses -Xbootclasspath/a, which is faster due to lack
+			# of verification, but gjl isn't flexible enough yet. :(
+			java-pkg_dolauncher ${PN}-j --main ${PN}
+			dosym ${PN}-j /usr/bin/${PN}
+			dobin tools/jvm/eval-client.pl
+			popd > /dev/null || die
+			;;
+		*)
+			die "Unknown MULTIBUILD_VARIANT ${MULTIBUILD_VARIANT}."
+			;;
+	esac
+}
+
+src_configure() {
+	multibuild_foreach_variant nqp_configure
+}
+
+src_compile() {
+	multibuild_foreach_variant nqp_compile
+}
+
+src_test() {
+	multibuild_foreach_variant nqp_test
+}
+
+src_install() {
+	multibuild_foreach_variant nqp_install
+
+	dodoc CREDITS README.pod
+	use doc && dodoc -r docs/*
+}