# Copyright 1999-2019 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=6
PYTHON_COMPAT=( python{2_7,3_{5,6}} )

inherit eutils flag-o-matic multiprocessing python-r1 toolchain-funcs versionator multilib-minimal

MY_P="${PN}_$(replace_all_version_separators _)"
MAJOR_V="$(get_version_component_range 1-2)"

DESCRIPTION="Boost Libraries for C++"
HOMEPAGE="https://www.boost.org/"
SRC_URI="https://downloads.sourceforge.net/project/boost/${PN}/${PV}/${MY_P}.tar.bz2"

LICENSE="Boost-1.0"
SLOT="0/${PV}" # ${PV} instead ${MAJOR_V} due to bug 486122
KEYWORDS="*"

IUSE="context debug doc icu +nls mpi python static-libs +threads tools"

RDEPEND="icu? ( >=dev-libs/icu-3.6:=[${MULTILIB_USEDEP}] )
	!icu? ( virtual/libiconv[${MULTILIB_USEDEP}] )
	mpi? ( >=virtual/mpi-2.0-r4[${MULTILIB_USEDEP},cxx,threads] )
	python? ( ${PYTHON_DEPS} )
	app-arch/bzip2[${MULTILIB_USEDEP}]
	sys-libs/zlib[${MULTILIB_USEDEP}]
	!app-admin/eselect-boost"
DEPEND="${RDEPEND}
	=dev-util/boost-build-${MAJOR_V}*"
REQUIRED_USE="
	mpi? ( threads )
	python? ( ${PYTHON_REQUIRED_USE} )"

S="${WORKDIR}/${MY_P}"

# the tests will never fail because these are not intended as sanity
# tests at all. They are more a way for upstream to check their own code
# on new compilers. Since they would either be completely unreliable
# (failing for no good reason) or completely useless (never failing)
# there is no point in having them in the ebuild to begin with.
RESTRICT="test"

PATCHES=(
	"${FILESDIR}/${PN}-1.48.0-disable_icu_rpath.patch"
	"${FILESDIR}/${PN}-1.55.0-context-x32.patch"
	"${FILESDIR}/${PN}-1.56.0-build-auto_index-tool.patch"
	"${FILESDIR}/${PN}-1.65.0-fix-python.patch"
)

python_bindings_needed() {
	multilib_is_native_abi && use python
}

tools_needed() {
	multilib_is_native_abi && use tools
}

create_user-config.jam() {
	local compiler compiler_version compiler_executable

	if [[ ${CHOST} == *-darwin* ]]; then
		compiler="darwin"
		compiler_version="$(gcc-fullversion)"
		compiler_executable="$(tc-getCXX)"
	else
		compiler="gcc"
		compiler_version="$(gcc-version)"
		compiler_executable="$(tc-getCXX)"
	fi
	local mpi_configuration python_configuration

	if use mpi; then
		mpi_configuration="using mpi ;"
	fi

	if python_bindings_needed; then
		# boost expects libpython$(pyver) and doesn't allow overrides
		# and the build system is so creepy that it's easier just to
		# provide a symlink (linker's going to use SONAME anyway)
		# TODO: replace it with proper override one day
		ln -f -s "$(python_get_library_path)" "${T}/lib${EPYTHON}$(get_libname)" || die

		if tc-is-cross-compiler; then
			python_configuration="using python : ${EPYTHON#python} : : ${SYSROOT:-${EROOT}}/usr/include/${EPYTHON} : ${SYSROOT:-${EROOT}}/usr/$(get_libdir) ;"
		else
			# note: we need to provide version explicitly because of
			# a bug in the build system:
			# https://github.com/boostorg/build/pull/104
			python_configuration="using python : ${EPYTHON#python} : ${PYTHON} : $(python_get_includedir) : ${T} ;"
		fi
	fi

	cat > "${BOOST_ROOT}/user-config.jam" << __EOF__ || die
using ${compiler} : ${compiler_version} : ${compiler_executable} : <cflags>"${CFLAGS}" <cxxflags>"${CXXFLAGS}" <linkflags>"${LDFLAGS}" ;
${mpi_configuration}
${python_configuration}
__EOF__
}

pkg_setup() {
	# Bail out on unsupported build configuration, bug #456792
	if [[ -f "${EROOT%/}/etc/site-config.jam" ]]; then
		grep -q gentoorelease "${EROOT%/}/etc/site-config.jam" && grep -q gentoodebug "${EROOT%/}/etc/site-config.jam" ||
		(
			eerror "You are using custom ${EROOT%/}/etc/site-config.jam without defined gentoorelease/gentoodebug targets."
			eerror "Boost can not be built in such configuration."
			eerror "Please, either remove this file or add targets from ${EROOT%/}/usr/share/boost-build/site-config.jam to it."
			die
		)
	fi
}

src_prepare() {
	default

	# Do not try to build missing 'wave' tool, bug #522682
	# Upstream bugreport - https://svn.boost.org/trac/boost/ticket/10507
	sed -i -e 's:wave/build//wave::' tools/Jamfile.v2 || die

	multilib_copy_sources
}

ejam() {
	local b2_opts=(
		"--user-config=${BOOST_ROOT}/user-config.jam"
		"$@"
	)
	echo b2 "${b2_opts[@]}"
	b2 "${b2_opts[@]}"
}

src_configure() {
	# Workaround for too many parallel processes requested, bug #506064
	[[ "$(makeopts_jobs)" -gt 64 ]] && MAKEOPTS="${MAKEOPTS} -j64"

	OPTIONS=(
		$(usex debug gentoodebug gentoorelease)
		"-j$(makeopts_jobs)"
		-q
		-d+2
	)

	if [[ ${CHOST} == *-darwin* ]]; then
		# We need to add the prefix, and in two cases this exceeds, so prepare
		# for the largest possible space allocation.
		append-ldflags -Wl,-headerpad_max_install_names
	elif [[ ${CHOST} == *-winnt* ]]; then
		compiler=parity
		if [[ $($(tc-getCXX) -v) == *trunk* ]]; then
			compilerVersion=trunk
		else
			compilerVersion=$($(tc-getCXX) -v | sed '1q' \
				| sed -e 's,\([a-z]*\) \([0-9]\.[0-9]\.[0-9][^ \t]*\) .*,\2,')
		fi
		compilerExecutable=$(tc-getCXX)
	fi

	# bug 298489
	if use ppc || use ppc64; then
		[[ $(gcc-version) > 4.3 ]] && append-flags -mno-altivec
	fi

	# Use C++14 globally as of 1.62
	append-cxxflags -std=c++14

	use icu && OPTIONS+=(
			"-sICU_PATH=${EPREFIX}/usr"
		)
	use icu || OPTIONS+=(
			--disable-icu
			boost.locale.icu=off
		)
	use mpi || OPTIONS+=(
			--without-mpi
		)
	use nls || OPTIONS+=(
			--without-locale
		)
	use context || OPTIONS+=(
			--without-context
			--without-coroutine
			--without-fiber
		)
	use threads || OPTIONS+=(
			--without-thread
		)

	OPTIONS+=(
		pch=off
		--boost-build="${EPREFIX}"/usr/share/boost-build
		--prefix="${ED%/}/usr"
		--layout=system
		# building with threading=single is currently not possible
		# https://svn.boost.org/trac/boost/ticket/7105
		threading=multi
		link=$(usex static-libs shared,static shared)
	)

	[[ ${CHOST} == *-winnt* ]] && OPTIONS+=(
			-sNO_BZIP2=1
		)
}

multilib_src_compile() {
	local -x BOOST_ROOT="${BUILD_DIR}"
	PYTHON_DIRS=""
	MPI_PYTHON_MODULE=""

	building() {
		create_user-config.jam

		local PYTHON_OPTIONS
		if python_bindings_needed; then
			PYTHON_OPTIONS=" --python-buildid=${EPYTHON#python}"
		else
			PYTHON_OPTIONS=" --without-python"
		fi

		ejam \
			"${OPTIONS[@]}" \
			${PYTHON_OPTIONS} \
			|| die "Building of Boost libraries failed"

		if python_bindings_needed; then
			if [[ -z "${PYTHON_DIRS}" ]]; then
				PYTHON_DIRS="$(find bin.v2/libs -name python | sort)"
			else
				if [[ "${PYTHON_DIRS}" != "$(find bin.v2/libs -name python | sort)" ]]; then
					die "Inconsistent structure of build directories"
				fi
			fi

			local dir
			for dir in ${PYTHON_DIRS}; do
				mv ${dir} ${dir}-${EPYTHON} \
					|| die "Renaming of '${dir}' to '${dir}-${EPYTHON}' failed"
			done

			if use mpi; then
				if [[ -z "${MPI_PYTHON_MODULE}" ]]; then
					MPI_PYTHON_MODULE="$(find bin.v2/libs/mpi/build/*/gentoo* -name mpi.so)"
					if [[ "$(echo "${MPI_PYTHON_MODULE}" | wc -l)" -ne 1 ]]; then
						die "Multiple mpi.so files found"
					fi
				else
					if [[ "${MPI_PYTHON_MODULE}" != "$(find bin.v2/libs/mpi/build/*/gentoo* -name mpi.so)" ]]; then
						die "Inconsistent structure of build directories"
					fi
				fi

				mv stage/lib/mpi.so stage/lib/mpi.so-${EPYTHON} \
					|| die "Renaming of 'stage/lib/mpi.so' to 'stage/lib/mpi.so-${EPYTHON}' failed"
			fi
		fi
	}
	if python_bindings_needed; then
		python_foreach_impl building
	else
		building
	fi

	if tools_needed; then
		pushd tools >/dev/null || die

		ejam \
			"${OPTIONS[@]}" \
			${PYTHON_OPTIONS} \
			|| die "Building of Boost tools failed"
		popd >/dev/null || die
	fi
}

multilib_src_install_all() {
	if ! use python; then
		rm -r "${ED%/}"/usr/include/boost/python* || die
	fi

	if ! use nls; then
		rm -r "${ED%/}"/usr/include/boost/locale || die
	fi

	if ! use context; then
		rm -r "${ED%/}"/usr/include/boost/context || die
		rm -r "${ED%/}"/usr/include/boost/coroutine{,2} || die
		rm "${ED%/}"/usr/include/boost/asio/spawn.hpp || die
	fi

	if use doc; then
		# find extraneous files that shouldn't be installed
		# as part of the documentation and remove them.
		find libs/*/* \( -iname 'test' -o -iname 'src' \) -exec rm -rf '{}' + || die
		find doc \( -name 'Jamfile.v2' -o -name 'build' -o -name '*.manifest' \) -exec rm -rf '{}' + || die
		find tools \( -name 'Jamfile.v2' -o -name 'src' -o -name '*.cpp' -o -name '*.hpp' \) -exec rm -rf '{}' + || die

		docinto html
		dodoc *.{htm,html,png,css}
		dodoc -r doc libs more tools

		# To avoid broken links
		dodoc LICENSE_1_0.txt

		dosym /usr/include/boost /usr/share/doc/${PF}/html/boost
	fi
}

multilib_src_install() {
	local -x BOOST_ROOT="${BUILD_DIR}"
	installation() {
		create_user-config.jam

		local PYTHON_OPTIONS
		if python_bindings_needed; then
			local dir
			for dir in ${PYTHON_DIRS}; do
				cp -pr ${dir}-${EPYTHON} ${dir} \
					|| die "Copying of '${dir}-${EPYTHON}' to '${dir}' failed"
			done

			if use mpi; then
				cp -p stage/lib/mpi.so-${EPYTHON} "${MPI_PYTHON_MODULE}" \
					|| die "Copying of 'stage/lib/mpi.so-${EPYTHON}' to '${MPI_PYTHON_MODULE}' failed"
				cp -p stage/lib/mpi.so-${EPYTHON} stage/lib/mpi.so \
					|| die "Copying of 'stage/lib/mpi.so-${EPYTHON}' to 'stage/lib/mpi.so' failed"
			fi
			PYTHON_OPTIONS=" --python-buildid=${EPYTHON#python}"
		else
			PYTHON_OPTIONS=" --without-python"
		fi

		ejam \
			"${OPTIONS[@]}" \
			${PYTHON_OPTIONS} \
			--includedir="${ED%/}/usr/include" \
			--libdir="${ED%/}/usr/$(get_libdir)" \
			install || die "Installation of Boost libraries failed"

		if python_bindings_needed; then
			rm -r ${PYTHON_DIRS} || die

			# Move mpi.so Python module to Python site-packages directory.
			# https://svn.boost.org/trac/boost/ticket/2838
			if use mpi; then
				local moddir=$(python_get_sitedir)/boost
				# moddir already includes eprefix
				mkdir -p "${D}${moddir}" || die
				mv "${ED%/}/usr/$(get_libdir)/mpi.so" "${D}${moddir}" || die
				cat << EOF > "${D}${moddir}/__init__.py" || die
import sys
if sys.platform.startswith('linux'):
	import DLFCN
	flags = sys.getdlopenflags()
	sys.setdlopenflags(DLFCN.RTLD_NOW | DLFCN.RTLD_GLOBAL)
	from . import mpi
	sys.setdlopenflags(flags)
	del DLFCN, flags
else:
	from . import mpi
del sys
EOF
			fi

			python_optimize
		fi
	}
	if python_bindings_needed; then
		python_foreach_impl installation
	else
		installation
	fi

	pushd "${ED%/}/usr/$(get_libdir)" >/dev/null || die

	local ext=$(get_libname)
	if use threads; then
		local f
		for f in *${ext}; do
			dosym ${f} /usr/$(get_libdir)/${f/${ext}/-mt${ext}}
		done
	fi

	popd >/dev/null || die

	if tools_needed; then
		dobin dist/bin/*

		insinto /usr/share
		doins -r dist/share/boostbook
	fi

	# boost's build system truely sucks for not having a destdir.  Because for
	# this reason we are forced to build with a prefix that includes the
	# DESTROOT, dynamic libraries on Darwin end messed up, referencing the
	# DESTROOT instread of the actual EPREFIX.  There is no way out of here
	# but to do it the dirty way of manually setting the right install_names.
	if [[ ${CHOST} == *-darwin* ]]; then
		einfo "Working around completely broken build-system(tm)"
		local d
		for d in "${ED%/}"/usr/lib/*.dylib; do
			if [[ -f ${d} ]]; then
				# fix the "soname"
				ebegin "  correcting install_name of ${d#${ED}}"
				install_name_tool -id "/${d#${D}}" "${d}"
				eend $?
				# fix references to other libs
				refs=$(otool -XL "${d}" | \
					sed -e '1d' -e 's/^\t//' | \
					grep "^libboost_" | \
					cut -f1 -d' ')
				local r
				for r in ${refs}; do
					ebegin "    correcting reference to ${r}"
					install_name_tool -change \
						"${r}" \
						"${EPREFIX}/usr/lib/${r}" \
						"${d}"
					eend $?
				done
			fi
		done
	fi
}

pkg_preinst() {
	# Yai for having symlinks that are nigh-impossible to remove without
	# resorting to dirty hacks like these. Removes lingering symlinks
	# from the slotted versions.
	local symlink
	for symlink in "${EROOT%/}/usr/include/boost" "${EROOT%/}/usr/share/boostbook"; do
		if [[ -L ${symlink} ]]; then
			rm -f "${symlink}" || die
		fi
	done

	# some ancient installs still have boost cruft lying around
	# for unknown reasons, causing havoc for reverse dependencies
	# Bug: 607734
	rm -rf "${EROOT%/}"/usr/include/boost-1_[3-5]? || die
}