dev-ml/llvm-ocaml: Split OCaml bindings out of LLVM

Introduce an ebuild to build LLVM OCaml bindings separately from LLVM
itself. As pointed out by our OCaml team, the OCaml bindings have to be
rebuilt much more frequently than LLVM itself (that is, on every
dependency upgrade). Furthermore, OCaml tests seem to have problems
running from build dir without LLVM installed. Therefore, use
the LLVM_OCAML_OUT_OF_TREE build logic that was added for OPAM.

3 files changed, 150 insertions, 0 deletions

diff --git a/dev-ml/llvm-ocaml/files/llvm-cmake-Remove-the-CMAKE_BUILD_TYPE-assertion.patch b/dev-ml/llvm-ocaml/files/llvm-cmake-Remove-the-CMAKE_BUILD_TYPE-assertion.patch
new file mode 100644
index 000000000000..8a2c091edfbf
--- /dev/null
+++ b/dev-ml/llvm-ocaml/files/llvm-cmake-Remove-the-CMAKE_BUILD_TYPE-assertion.patch
@@ -0,0 +1,28 @@
+From a2ecd4815d285281cb816e06b25dc0dc2a933073 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Micha=C5=82=20G=C3=B3rny?= <mgorny@gentoo.org>
+Date: Sun, 21 Aug 2016 23:13:45 +0200
+Subject: [PATCH 06/10] cmake: Remove the CMAKE_BUILD_TYPE assertion
+
+---
+ CMakeLists.txt | 5 -----
+ 1 file changed, 5 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 894bc8c..453fcb8 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -232,11 +232,6 @@ endif()
+ 
+ string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
+ 
+-if (CMAKE_BUILD_TYPE AND
+-    NOT uppercase_CMAKE_BUILD_TYPE MATCHES "^(DEBUG|RELEASE|RELWITHDEBINFO|MINSIZEREL)$")
+-  message(FATAL_ERROR "Invalid value for CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
+-endif()
+-
+ set(LLVM_LIBDIR_SUFFIX "" CACHE STRING "Define suffix of library directory name (32/64)" )
+ 
+ set(LLVM_TOOLS_INSTALL_DIR "bin" CACHE STRING "Path for binary subdirectory (defaults to 'bin')")
+-- 
+2.9.3
+
diff --git a/dev-ml/llvm-ocaml/llvm-ocaml-9999.ebuild b/dev-ml/llvm-ocaml/llvm-ocaml-9999.ebuild
new file mode 100644
index 000000000000..43a6277d8d82
--- /dev/null
+++ b/dev-ml/llvm-ocaml/llvm-ocaml-9999.ebuild
@@ -0,0 +1,115 @@
+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Id$
+
+EAPI=6
+
+: ${CMAKE_MAKEFILE_GENERATOR:=ninja}
+CMAKE_MIN_VERSION=3.4.3
+
+PYTHON_COMPAT=( python2_7 )
+inherit cmake-utils git-r3 python-any-r1
+
+DESCRIPTION="OCaml bindings for LLVM"
+HOMEPAGE="http://llvm.org/"
+SRC_URI=""
+EGIT_REPO_URI="http://llvm.org/git/llvm.git
+	https://github.com/llvm-mirror/llvm.git"
+
+# Keep in sync with sys-devel/llvm
+ALL_LLVM_TARGETS=( AArch64 AMDGPU ARM BPF Hexagon Lanai Mips MSP430
+	NVPTX PowerPC RISCV Sparc SystemZ X86 XCore )
+ALL_LLVM_TARGETS=( "${ALL_LLVM_TARGETS[@]/#/llvm_targets_}" )
+LLVM_TARGET_USEDEPS=${ALL_LLVM_TARGETS[@]/%/?}
+
+LICENSE="UoI-NCSA"
+SLOT="0/${PV}"
+KEYWORDS=""
+IUSE="test ${ALL_LLVM_TARGETS[*]}"
+
+RDEPEND="
+	>=dev-lang/ocaml-4.00.0:0=
+	dev-ml/ocaml-ctypes:=
+	~sys-devel/llvm-${PV}:=[${LLVM_TARGET_USEDEPS// /,}]
+	!sys-devel/llvm[ocaml(-)]"
+# configparser-3.2 breaks the build (3.3 or none at all are fine)
+DEPEND="${RDEPEND}
+	dev-lang/perl
+	dev-ml/findlib
+	test? ( dev-ml/ounit
+		$(python_gen_any_dep 'dev-python/lit[${PYTHON_USEDEP}]') )
+	!!<dev-python/configparser-3.3.0.2
+	${PYTHON_DEPS}"
+
+REQUIRED_USE="${PYTHON_REQUIRED_USE}
+	|| ( ${ALL_LLVM_TARGETS[*]} )"
+
+python_check_deps() {
+	! use test \
+		|| has_version "dev-python/lit[${PYTHON_USEDEP}]"
+}
+
+src_prepare() {
+	# Python is needed to run tests using lit
+	python_setup
+
+	# Allow custom cmake build types (like 'Gentoo')
+	eapply "${FILESDIR}"/llvm-cmake-Remove-the-CMAKE_BUILD_TYPE-assertion.patch
+
+	# User patches
+	eapply_user
+}
+
+src_configure() {
+	local libdir=$(get_libdir)
+	local mycmakeargs=(
+		-DLLVM_LIBDIR_SUFFIX=${libdir#lib}
+
+		-DBUILD_SHARED_LIBS=ON
+		-DLLVM_OCAML_OUT_OF_TREE=ON
+		-DLLVM_TARGETS_TO_BUILD="${LLVM_TARGETS// /;}"
+		-DLLVM_BUILD_TESTS=$(usex test)
+
+		# disable various irrelevant deps and settings
+		-DLLVM_ENABLE_FFI=OFF
+		-DLLVM_ENABLE_TERMINFO=OFF
+		-DHAVE_HISTEDIT_H=NO
+		-DWITH_POLLY=OFF
+		-DLLVM_ENABLE_ASSERTIONS=OFF
+		-DLLVM_ENABLE_EH=ON
+		-DLLVM_ENABLE_RTTI=ON
+
+		-DLLVM_HOST_TRIPLE="${CHOST}"
+
+		# disable go bindings
+		-DGO_EXECUTABLE=GO_EXECUTABLE-NOTFOUND
+
+		# TODO: ocamldoc
+	)
+
+	use test && mycmakeargs+=(
+		-DLIT_COMMAND="${EPREFIX}/usr/bin/lit"
+	)
+
+	cmake-utils_src_configure
+}
+
+src_compile() {
+	cmake-utils_src_compile ocaml_all
+}
+
+src_test() {
+	# respect TMPDIR!
+	local -x LIT_PRESERVES_TMP=1
+	# Force using system-installed tools.
+	sed -i -e "/llvm_tools_dir/s@\".*\"@\"${EPREFIX}/usr/bin\"@" \
+		"${BUILD_DIR}"/test/lit.site.cfg || die
+	cmake-utils_src_make check-llvm-bindings-ocaml
+}
+
+src_install() {
+	DESTDIR="${D}" \
+	cmake -P "${BUILD_DIR}"/bindings/ocaml/cmake_install.cmake || die
+
+	dodoc bindings/ocaml/README.txt
+}
diff --git a/dev-ml/llvm-ocaml/metadata.xml b/dev-ml/llvm-ocaml/metadata.xml
new file mode 100644
index 000000000000..89c4bdb96049
--- /dev/null
+++ b/dev-ml/llvm-ocaml/metadata.xml
@@ -0,0 +1,7 @@
+<?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>
+</pkgmetadata>