# $Id$

PNAME="llvm"
PVER="9.0.0"
PBUILD="r1"

# build lldb or not
LLDB_ENABLED=0

# gcc version which llvm was compiled with
GCC_VER="9.2.0"

SPLIT_PACKAGES="llvm-libs llvm lld clang clang-tools-extra"

if [[ ${LLDB_ENABLED} = 1 ]]
then
	SPLIT_PACKAGES+=" lldb"
fi

PCAT="sys-dev"
HOMEPAGE="http://llvm.org/"

DEPEND_x86_64=">= sys-apps/multiarch-wrapper-1"
SPECIAL_VARS="DEPEND_x86_64"

XML_DEPEND=">= dev-libs/libxml2-2.9"

LLVM_DEPEND="$(marchdepend)
	>= dev-lang/perl-5.30"

# lldb requires readline or libedit
LLDB_DEPEND=">= sys-libs/readline-6.3
	>= dev-lang/python3-3.7
	>= dev-python/python3-six-1.9
	${XML_DEPEND}"

CLANG_DEPEND="${XML_DEPEND}
	== sys-dev/gcc-${GCC_VER}"

LIB_DEPEND=">= dev-libs/libffi-3.2
	>= sys-libs/zlib-1.2
	>= sys-libs/ncurses-6.1
	== sys-libs/libstdc++-${GCC_VER}"

SDEPEND="${LIB_DEPEND}
	${LLVM_DEPEND}
	${CLANG_DEPEND}
	>= dev-util/pkgconfig-0.25
	>= sys-dev/bison-2.5
	>= sys-dev/flex-2.3.35
	>= sys-dev/make-3.82
	>= sys-dev/binutils-2.32
	>= dev-lang/python3-3.7
	>= virtual/sed
	>= dev-lang/swig-4.0.1
	>= dev-libs/libffi-dev-3.2
	>= sys-libs/zlib-dev-1.2
	>= sys-libs/ncurses-dev-6.1
	>= dev-libs/libxml2-dev-2.9"

if [[ ${LLDB_ENABLED} = 1 ]]
then
	SDEPEND="${SDEPEND}
		${LLDB_DEPEND}"
fi

SRCFILE="${PNAME}-${PVER}.src.tar.xz"
SRCDIR="${BUILDDIR}/${PNAME}-${PVER}.src"

CLANG_SRCFILE="cfe-${PVER}.src.tar.xz"
CLANG_SRCDIR="${BUILDDIR}/cfe-${PVER}.src"

CLANG_EXTRA_SRCFILE="clang-tools-extra-${PVER}.src.tar.xz"
CLANG_EXTRA_SRCDIR="${BUILDDIR}/clang-tools-extra-${PVER}.src"

COMPILER_RT_SRCFILE="compiler-rt-${PVER}.src.tar.xz"
COMPILER_RT_SRCDIR="${BUILDDIR}/compiler-rt-${PVER}.src"

LLD_SRCFILE="lld-${PVER}.src.tar.xz"
LLD_SRCDIR="${BUILDDIR}/lld-${PVER}.src"

LLDB_SRCFILE="lldb-${PVER}.src.tar.xz"
LLDB_SRCDIR="${BUILDDIR}/lldb-${PVER}.src"

MANPAGES_SRCFILE="${PNAME}-${PVER}-manpages.tar.bz2"
MANPAGES_SRCDIR="${BUILDDIR}/${PNAME}-${PVER}-manpages"

sminclude multilib python2 mtools cmake cleanutils
msetfeature "!check"

SRC_URI=(
	http://llvm.org/releases/${PVER}/${SRCFILE}
	http://llvm.org/releases/${PVER}/${CLANG_SRCFILE}
	http://llvm.org/releases/${PVER}/${CLANG_EXTRA_SRCFILE}
	http://llvm.org/releases/${PVER}/${COMPILER_RT_SRCFILE}
	http://llvm.org/releases/${PVER}/${LLD_SRCFILE}
	mirror://${PNAME}/${SRCFILE}
	mirror://${PNAME}/${MANPAGES_SRCFILE}
)

if [[ ${LLDB_ENABLED} = 1 ]]
then
	SRC_URI+=( http://llvm.org/releases/${PVER}/${LLDB_SRCFILE} )
fi

#UP2DATE="updatecmd ${HOMEPAGE} | grep 'Download now' | sed 's:.*][lL][lL][vV][mM]\ \(.*\):\1:'"
UP2DATE="updatecmd ${HOMEPAGE}/releases/download.html | grep '.src.' | grep '/${PNAME}-[0-9]' | sed 's:.src::g' | highesttarball xz"

# pkgs which require a rebuild: mesa

split_info_llvm-libs()
{
	DESCRIPTION="The Low Level Virtual Machine Runtime Library."
	DEPEND="${LIB_DEPEND}"
	PCAT="sys-libs"
}

split_info_llvm()
{
	DESCRIPTION="The Low Level Virtual Machine."
	DEPEND="${LLVM_DEPEND}
		== sys-libs/llvm-libs-${PVER}"
}

split_info_lld()
{
	DESCRIPTION="LLVM Linker."
	DEPEND="== sys-libs/llvm-libs-${PVER}"
}

split_info_lldb()
{
	DESCRIPTION="Next generation, high-performance debugger."
	DEPEND="${LLDB_DEPEND}"
}

split_info_clang()
{
	DESCRIPTION="C language family frontend for LLVM."
	DEPEND="${CLANG_DEPEND}
		== sys-libs/llvm-libs-${PVER}"
}

split_info_clang-tools-extra()
{
	DESCRIPTION="Extra tools built using clang's tooling APIs."
	DEPEND="== sys-dev/clang-${PVER}"
}

src_prepare()
{
	munpack ${SRCFILE} || die
	SRCDIR="${LLD_SRCDIR}" munpack ${LLD_SRCFILE} || die
	SRCDIR="${CLANG_SRCDIR}" munpack ${CLANG_SRCFILE} || die
	SRCDIR="${CLANG_EXTRA_SRCDIR}" munpack ${CLANG_EXTRA_SRCFILE} || die
	SRCDIR="${COMPILER_RT_SRCDIR}" munpack ${COMPILER_RT_SRCFILE} || die
	if [[ ${LLDB_ENABLED} = 1 ]]
	then
		SRCDIR="${LLDB_SRCDIR}" munpack ${LLDB_SRCFILE} || die
	fi

	# move all sources into the llvm src tree
	all-abis mv ${LLD_SRCDIR}-$(mabi) ${SRCDIR}-$(mabi)/tools/lld || die
	all-abis mv ${CLANG_SRCDIR}-$(mabi) ${SRCDIR}-$(mabi)/tools/clang || die
	all-abis mv ${CLANG_EXTRA_SRCDIR}-$(mabi) ${SRCDIR}-$(mabi)/tools/clang/tools/extra || die
	all-abis mv ${COMPILER_RT_SRCDIR}-$(mabi) ${SRCDIR}-$(mabi)/projects/compiler-rt || die
	if [[ ${LLDB_ENABLED} = 1 ]]
	then
		all-abis mv ${LLDB_SRCDIR}-$(mabi) ${SRCDIR}-$(mabi)/tools/lldb || die
	fi

	# pre-generated man-pages
	oldmunpack ${MANPAGES_SRCFILE} || die
}

src_compile()
{
	# honor outside tree builds
	cmake_setup_builddir || die

	cmake_configure \
		-DLLVM_BUILD_LLVM_DYLIB=ON \
		-DLLVM_DYLIB_EXPORT_ALL=ON \
		-DLLVM_LINK_LLVM_DYLIB=ON \
		-DLLVM_ENABLE_RTTI=ON \
		-DLLVM_ENABLE_FFI=ON \
		-DLLVM_BUILD_TESTS=ON \
		-DLLVM_BUILD_DOCS=OFF \
		-DLLVM_ENABLE_SPHINX=OFF \
		-DLLVM_ENABLE_DOXYGEN=OFF \
		-DSPHINX_WARNINGS_AS_ERRORS=OFF \
		-DFFI_INCLUDE_DIR=$(pkg-config --variable=includedir libffi) \
		-DLLVM_BINUTILS_INCDIR=/usr/include \
		'$([[ $(mlibdir) != lib ]] && echo "-DLLVM_LIBDIR_SUFFIX=64")' \
		|| die

	all-abis SRCDIR=${BUILDDIR}/build mmake || die

	# Disable automatic installation of components that go into subpackages
	SRCDIR=${BUILDDIR}/build all-abis "sed -i '/\(clang\|lld\|lldb\)\/cmake_install.cmake/d' tools/cmake_install.cmake || die"
	SRCDIR=${BUILDDIR}/build all-abis "sed -i '/extra\/cmake_install.cmake/d' tools/clang/tools/cmake_install.cmake || die"
	SRCDIR=${BUILDDIR}/build all-abis "sed -i '/compiler-rt\/cmake_install.cmake/d' projects/cmake_install.cmake || die"
}

src_check()
{
	all-abis SRCDIR=${BUILDDIR}/build mmake -k check-llvm || die
	all-abis SRCDIR=${BUILDDIR}/build mmake -k check-lld || die
	all-abis SRCDIR=${BUILDDIR}/build mmake -k check-clang || die
	all-abis SRCDIR=${BUILDDIR}/build mmake -k check-clang-tools || die
}

src_install_llvm-libs()
{
	SRCDIR=${BUILDDIR}/build mmake DESTDIR=${BINDIR} install || die

	# keep libLLVM.so libLTO.so LLVMgold.so only
	zapmost ${BINDIR} \
		usr/$(mlibdir)/libLLVM*.so \
		usr/$(mlibdir)/libLTO*.so \
		usr/$(mlibdir)/LLVMgold.so \
		$([[ $(mlibdir) != lib ]] && echo "usr/lib/libLLVM*.so") \
		$([[ $(mlibdir) != lib ]] && echo "usr/lib/libLTO*.so") \
		$([[ $(mlibdir) != lib ]] && echo "usr/lib/LLVMgold.so") \
		|| die

	# symlink gold linker
	all-abis 'minstalldir /usr/$(mlibdir)/bfd-plugins || die'
	all-abis 'mlink ../LLVMgold.so /usr/$(mlibdir)/bfd-plugins/LLVMgold.so' || die
}

src_install_llvm()
{

	SRCDIR=${BUILDDIR}/build mmake DESTDIR=${BINDIR} install || die

	# install pre-generated man-pages
	minstallman ${MANPAGES_SRCDIR}/llvm/*.1 || die

	# remove libs provided by llvm-libs
	mdelete /usr/$(mlibdir)/libLLVM*.so || die
	mdelete /usr/$(mlibdir)/libLTO*.so || die
	mdelete /usr/$(mlibdir)/LLVMgold.so || die
	if [[ $(mlibdir) != lib ]]
	then
		mdelete /usr/lib/libLLVM*.so || die
		mdelete /usr/lib/libLTO*.so || die
		mdelete /usr/lib/LLVMgold.so || die
	fi

	# be multilib friendly
	if [[ $(mlibdir) != lib ]]
	then
		if [[ -f ${BINDIR}/usr/bin/llvm-config ]]
		then
			mdelete /usr/bin/llvm-config || die
		fi
		SRCDIR=${BUILDDIR}/build all-abis minstallexec bin/llvm-config /usr/bin/llvm-config-$(mabi) || die
		mlink multiarch-wrapper /usr/bin/llvm-config || die
 
		if [[ -f ${BINDIR}/usr/include/llvm/Config/llvm-config.h ]]
		then
			mdelete /usr/include/llvm/Config/llvm-config.h || die
		fi
		SRCDIR=${BUILDDIR}/build all-abis minstallfile include/llvm/Config/llvm-config.h /usr/include/llvm/Config/llvm-config-$(mabi).h || die
		cat > ${BINDIR}/usr/include/llvm/Config/llvm-config.h << EOF
#include <bits/wordsize.h>

#if __WORDSIZE == 32
#include "llvm-config-m32.h"
 #elif __WORDSIZE == 64
 #include "llvm-config-m64.h"
 #else
 #error "Unknown word size"
 #endif
EOF
	fi
}

src_install_clang()
{
	SRCDIR=${BUILDDIR}/build mmake -C tools/clang DESTDIR=${BINDIR} install || die
	SRCDIR=${BUILDDIR}/build mmake -C projects/compiler-rt DESTDIR=${BINDIR} install || die

	# install pre-generated man-pages
	minstallman ${MANPAGES_SRCDIR}/clang/*.1 || die

	# fix libexec
	mv ${BINDIR}/usr/libexec/ccc-analyzer ${BINDIR}/usr/$(mlibdir)/clang || die
	mv ${BINDIR}/usr/libexec/c++-analyzer ${BINDIR}/usr/$(mlibdir)/clang || die
	rmdir ${BINDIR}/usr/libexec || die
	sed -i "s:libexec:$(mlibdir)/clang:g" ${BINDIR}/usr/bin/scan-build || die

	# install python bindings (non multilib)
	minstalldir $(mget-python-libdir) || die
	all-abis mcopy -r tools/clang/bindings/python/clang $(mget-python-libdir)/ || die
	# compile all python scripts
	python -m compileall ${BINDIR} || die
	python -O -m compileall ${BINDIR} || die

	minstalldocs tools/clang/LICENSE.TXT || die
}

src_install_clang-tools-extra()
{
	SRCDIR=${BUILDDIR}/build mmake -C tools/clang/tools/extra DESTDIR=${BINDIR} install || die
	minstalldocs tools/clang/tools/extra/LICENSE.TXT || die
}

src_install_lld()
{
	SRCDIR=${BUILDDIR}/build mmake -C tools/lld DESTDIR=${BINDIR} install || die
	minstalldocs tools/lld/LICENSE.TXT || die
}

src_install_lldb()
{
	SRCDIR=${BUILDDIR}/build mmake -C tools/lldb DESTDIR=${BINDIR} install || die

	# remove bundled python-six library
	all-abis 'mdelete $(mget-python-libdir)/six.py || die'

	# compile all python scripts
	python -m compileall ${BINDIR} || die
	python -O -m compileall ${BINDIR} || die

	minstalldocs tools/lldb/LICENSE.TXT || die
}

postinstall_llvm-libs()
{
	if [[ -f ${MROOT}/etc/env.d/10llvm ]]
	then
		rm ${MROOT}/etc/env.d/10llvm
		env-rebuild
	fi
}