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# Copyright 1999-2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=6

RESTRICT="test"

inherit git-r3 llvm pax-utils toolchain-funcs

DESCRIPTION="High-performance programming language for technical computing"
HOMEPAGE="https://julialang.org/"
SRC_URI=""
EGIT_REPO_URI="https://github.com/JuliaLang/julia.git"

LICENSE="MIT"
SLOT="0"
KEYWORDS=""
IUSE=""

RDEPEND="
	>=sys-devel/llvm-6.0.0:=
	>=sys-devel/clang-6.0.0:="

RDEPEND+="
	dev-libs/double-conversion:0=
	dev-libs/gmp:0=
	dev-libs/libgit2:0=
	>=dev-libs/libpcre2-10.23:0=[jit]
	dev-libs/mpfr:0=
	dev-libs/openspecfun
	sci-libs/amd:0=
	sci-libs/arpack:0=
	sci-libs/camd:0=
	sci-libs/ccolamd:0=
	sci-libs/cholmod:0=
	sci-libs/colamd:0=
	sci-libs/fftw:3.0=[threads]
	sci-libs/openlibm:0=
	sci-libs/spqr:0=
	sci-libs/umfpack:0=
	sci-mathematics/glpk:0=
	>=sys-libs/libunwind-1.1:7=
	sys-libs/readline:0=
	sys-libs/zlib:0=
	>=virtual/blas-3.6
	virtual/lapack"

DEPEND="${RDEPEND}
	dev-util/patchelf
	virtual/pkgconfig"

PATCHES=(
	"${FILESDIR}"/${PN}-9999-fix_build_system.patch
)

src_prepare() {
	default

	# Sledgehammer:
	# - respect CFLAGS
	# - respect EPREFIX and Gentoo specific paths
	# - fix BLAS and LAPACK link interface

	sed -i \
		-e "s|GENTOOCFLAGS|${CFLAGS}|g" \
		-e "s|/usr/include|${EPREFIX}/usr/include|g" \
		deps/Makefile || die

	local libblas="$($(tc-getPKG_CONFIG) --libs-only-l blas)"
	libblas="${libblas%% *}"
	libblas="lib${libblas#-l}"
	local liblapack="$($(tc-getPKG_CONFIG) --libs-only-l lapack)"
	liblapack="${liblapack%% *}"
	liblapack="lib${liblapack#-l}"

	sed -i \
		-e "s|GENTOOCFLAGS|${CFLAGS}|g" \
		-e "s|GENTOOLIBDIR|$(get_libdir)|" \
		-e "s|^JULIA_COMMIT = .*|JULIA_COMMIT = v${PV}|" \
		-e "s|-lblas|$($(tc-getPKG_CONFIG) --libs blas)|" \
		-e "s|= libblas|= ${libblas}|" \
		-e "s|-llapack|$($(tc-getPKG_CONFIG) --libs lapack)|" \
		-e "s|= liblapack|= ${liblapack}|" \
		Make.inc || die

	sed -i \
		-e "s|,lib)|,$(get_libdir))|g" \
		-e "s|\$(BUILD)/lib|\$(BUILD)/$(get_libdir)|g" \
		Makefile || die

	sed -i \
		-e "s|ar -rcs|$(tc-getAR) -rcs|g" \
		src/Makefile || die
}

src_configure() {
	# julia does not play well with the system versions of dsfmt, libuv,
	# and utf8proc

	# USE_SYSTEM_LIBM=0 implies using external openlibm
	cat <<-EOF > Make.user
		USE_SYSTEM_ARPACK:=1
		USE_SYSTEM_BLAS:=1
		USE_SYSTEM_DSFMT:=0
		USE_SYSTEM_GMP:=1
		USE_SYSTEM_GRISU:=1
		USE_SYSTEM_LAPACK:=1
		USE_SYSTEM_LIBGIT2:=1
		USE_SYSTEM_LIBM:=0
		USE_SYSTEM_LIBUNWIND:=1
		USE_SYSTEM_LIBUV:=0
		USE_SYSTEM_LLVM:=1
		USE_LLVM_SHLIB:=1
		USE_SYSTEM_MPFR:=1
		USE_SYSTEM_OPENLIBM:=1
		USE_SYSTEM_OPENSPECFUN:=1
		USE_SYSTEM_PATCHELF:=1
		USE_SYSTEM_PCRE:=1
		USE_SYSTEM_READLINE:=1
		USE_SYSTEM_RMATH:=0
		USE_SYSTEM_SUITESPARSE:=1
		USE_SYSTEM_UTF8PROC:=0
		USE_SYSTEM_ZLIB=1
		VERBOSE=1
		libdir="${EROOT}/usr/$(get_libdir)"
	EOF

}

src_compile() {

	# Julia accesses /proc/self/mem on Linux
	addpredict /proc/self/mem

	emake cleanall

	# Create symlinks...
	local libblas="$($(tc-getPKG_CONFIG) --libs-only-l blas)"
	libblas="${libblas%% *}"
	libblas="lib${libblas#-l}"
	local liblapack="$($(tc-getPKG_CONFIG) --libs-only-l lapack)"
	liblapack="${liblapack%% *}"
	liblapack="lib${liblapack#-l}"
	mkdir -p "${S}"/usr/lib/julia || die "mkdir failed"
	for i in ${libblas}.so ${liblapack}.so libumfpack.so libspqr.so; do
		ln -s "${EROOT}/usr/$(get_libdir)/${i}" "${S}"/usr/lib/julia/ || die "ln failed"
	done

	emake VERBOSE=1 julia-release \
		prefix="${EPREFIX}/usr" DESTDIR="${D}" \
		CC="$(tc-getCC)" CXX="$(tc-getCXX)"
	pax-mark m $(file usr/bin/julia-* | awk -F : '/ELF/ {print $1}')
	emake
}

src_test() {
	emake test
}

src_install() {
	emake install \
		prefix="${EPREFIX}/usr" DESTDIR="${D}" \
		CC="$(tc-getCC)" CXX="$(tc-getCXX)"
	cat > 99julia <<-EOF
		LDPATH=${EROOT}/usr/$(get_libdir)/julia
	EOF
	doenvd 99julia

	dodoc README.md

	mv "${ED}"/usr/etc/julia "${ED}"/etc || die
	rmdir "${ED}"/usr/etc || die
	mv "${ED}"/usr/share/doc/julia/{examples,html} \
		"${ED}"/usr/share/doc/${PF} || die
	rmdir "${ED}"/usr/share/doc/julia || die
}