# Maintainer: Mitch Tishmack <mitch.tishmack@gmail.com>
pkgname=ghc
pkgver=8.4.3
pkgrel=0
# Normal non rc candidate
_urlprefix="$pkgver"
_pkgprefix="$pkgname-$pkgver"
pkgdesc="The Glasgow Haskell Compiler"
# Next 5 variables only needed for release candidate testing
#pkgrcver=8.2.2
#pkgrc=rc3
#pkgdate=20171108
#urlprefix="$pkgrcver-$pkgrc"
#pkgprefix="ghc-$pkgver.$pkgdate"
url="http://haskell.org"
arch="x86_64"
# Note ghc's license is basically BSD-3. If you'd like to know more visit:
# * https://www.haskell.org/ghc/license
# * https://ghc.haskell.org/trac/ghc/wiki/Licensing
license="BSD-3-Clause"
# Note that ghc is sensitive to the version of llvm used,
# hence the llvm5 dependency.
#
# Ref: https://ghc.haskell.org/trac/ghc/wiki/Status/GHC-8.0.1
#      https://ghc.haskell.org/trac/ghc/wiki/ImprovedLLVMBackend
depends="gmp-dev perl gcc>=6.2.1 llvm5 libffi-dev"
# ghc is self-hosted, so we need ghc to build ghc. ghc-bootstrap is provided by
# this aport (see below).
makedepends_build="$pkgname-bootstrap
	autoconf cpio binutils binutils-gold paxmark libffi-dev ncurses-dev xz coreutils"
makedepends_host="linux-headers musl-dev zlib-dev gmp-dev binutils-dev libffi-dev ncurses-dev cpio" # need GNU cpio
makedepends="$makedepends_build $makedepends_host"
checkdepends="python3"
# XXX: ghc-bootstrap is a hack to allow this abuild to depend on itself.
# Adding "ghc" to makedepends would not work, because abuild implicitly removes
# $pkgname and $subpackages from the abuild's dependencies.
provides="$pkgname-bootstrap=$pkgver-r$pkgrel"
subpackages="$pkgname-doc $pkgname-dev"
install="$pkgname.post-install"
options="!strip"  # we strip it manually in build()
source="https://downloads.haskell.org/~ghc/$_urlprefix/$_pkgprefix-src.tar.xz
        https://downloads.haskell.org/~ghc/$_urlprefix/$_pkgprefix-testsuite.tar.xz
        0005-buildpath-abi-stability.patch
        "

# We only need the bootstrap patch when bootstrapping a new arches ghc.
if [ "$CBUILD" != "$CTARGET" ]; then
	source="$source 0000-bootstrap.patch"
fi

builddir="$srcdir/$_pkgprefix"

prepare() {
	default_prepare

	cp mk/build.mk.sample mk/build.mk

	cat >> mk/build.mk <<-EOF
		BuildFlavour         = perf-llvm
		INTEGER_LIBRARY      = integer-gmp
		BeConservative       = YES
		GhcStage3HcOpts     += -O3
		SplitSections        = YES
	EOF

	if [ "$CBUILD" != "$CTARGET" ]; then
		# cross-build
		cat >> mk/build.mk <<-EOF
			HADDOCK_DOCS         = NO
			BUILD_SPHINX_HTML    = NO
			BUILD_SPHINX_PS      = NO
			BUILD_SPHINX_PDF     = NO
		EOF
	fi

	# Due to patches to the configure script
	autoreconf
}

build() {
	cd "$builddir"

	local ffi_inc=$(pkg-config libffi --cflags-only-I); ffi_inc="${ffi_inc%% }"
	local ffi_lib=$(pkg-config libffi --libs-only-L); ffi_lib="${ffi_lib%% }"

	GHCLD=${CROSS_COMPILE}ld.gold

	# NOTE: ghc build system requires host == build, and it ends up
	# compiling the cross-compiler (stage1) and cross-compiling with
	# that the native compiler (stage2)
	./configure \
		--build=$CBUILD \
		--host=$CBUILD \
		--target=$CTARGET \
		--prefix=/usr \
		--with-system-libffi \
		${ffi_inc:+--with-ffi-includes="${ffi_inc#-I}"} \
		${ffi_lib:+--with-ffi-libraries="${ffi_lib#-L}"} \
		--with-ar=${CROSS_COMPILE}ar \
		--with-nm=${CROSS_COMPILE}nm \
		--with-ranlib=${CROSS_COMPILE}ranlib \
		--with-objdump=${CROSS_COMPILE}objdump \
		--disable-ld-override \
		CONF_CPP_OPTS_STAGE0=" $ffi_inc $ffi_lib " \
		CONF_CC_OPTS_STAGE0=" $ffi_inc $ffi_lib " \
		LD=$GHCLD

	# Switch llvm-targets from unknown-linux-gnueabihf->alpine-linux
	# so we can match the llvm vendor string alpine uses
	sed -i -e 's/unknown-linux-gnueabihf/alpine-linux/g' llvm-targets
	sed -i -e 's/unknown-linux-gnueabi/alpine-linux/g' llvm-targets
	sed -i -e 's/unknown-linux-gnu/alpine-linux/g' llvm-targets

	make
}

check() {
	cd "$builddir/testsuite"
	make fast THREADS=$JOBS
}

doc() {
	default_doc
	install -Dm644 "$builddir/LICENSE" \
		"$subpkgdir/usr/share/licenses/$subpkgname/LICENSE"
}

package() {
	local ghclib="usr/lib/ghc-$pkgver"
	local newpath path target

	cd "$builddir"
	make -j1 DESTDIR="$pkgdir" install

	cd "$pkgdir"

	# Fixup install tree if needed.
	if [ -d usr/lib/$CTARGET-ghc-$pkgver ]; then
		# different location
		ghclib="usr/lib/$CTARGET-ghc-$pkgver"

		# Rename binaries and fix links.
		local path; for path in usr/bin/"$CTARGET"-*; do
			newpath="${path//$CTARGET-/}"

			if [ -h "$path" ]; then
				target="$(readlink $path)"
				ln -sf "${target//$CTARGET-/}" "$newpath"
				rm "$path"
			else
				mv "$path" "$newpath"
			fi
		done

		# Remove triplet prefix from settings -- the intention is
		# that the native compiler will use native gcc/ld on the target.
		sed -i "s|$CTARGET-||g" usr/lib/$CTARGET-ghc-$pkgver/settings
	fi

	# Can't do a full strip on archives.
	find . -type f \( -name "*.so" -o -name "*.a" \) \
		-exec ${CROSS_COMPILE}strip --strip-unneeded {} \;
	find $ghclib/bin -type f -exec ${CROSS_COMPILE}strip {} \;

	paxmark -m \
		$ghclib/bin/ghc \
		$ghclib/bin/ghc-iserv \
		$ghclib/bin/ghc-iserv-dyn \
		$ghclib/bin/ghc-iserv-prof
}

# Like debian, we split apart the profiled archives/etc...
# This drastically reduces the install size of the ghc pkg.
dev() {
	pkgdesc="$pkgdesc (development files)"
	depends="$pkgname=$pkgver-r$pkgrel"

	cd "$pkgdir"

	install -dm755 "$subpkgdir"

	local pfiles=$(find . \( -type f -o -type l \) \( -name "*.p_*" -o -name "lib*_p.a" \))
	echo "$pfiles" | cpio -pamVd "$subpkgdir"
	echo "$pfiles" | xargs rm -fr
}
sha512sums="c6cea84264f32ae888f9931f834a1d721889242f656d14262e787ec54a1793d1862ce76daacaf1006c12b8af12919501afce1dc02571373e24830e4d51803414  ghc-8.4.3-src.tar.xz
8a6d1016ae7166c0932973a22e8bfa02e4edab2374ea4dbcc7c9315245bc2df72f8faab2e1e15220c0eeeeeee89549deb1b3ae6bb56899b208345ef02f53aa16  ghc-8.4.3-testsuite.tar.xz
e1c2cef06d307eda4b35521204e95eb54ace5dbcd22de659e95356f884b4424d6304365e4ab45c5116192cba4c095e2e91114bc7cb73d7c7173a7035287d0854  0005-buildpath-abi-stability.patch"