# Contributor: Sören Tempel <soeren+alpine@soeren-tempel.net>
# Maintainer: Eivind Uggedal <eivind@uggedal.com>
pkgname=go
pkgver=1.8.3
# This should be the latest commit on the corresponding release branch
_toolsver="5682db0e919ed9cfc6f52ac32e170511a106eb3b"
pkgrel=0
pkgdesc="Go programming language compiler"
url="http://www.golang.org/"
arch="all"
license="BSD"
depends="binutils gcc"
depends_dev=""
makedepends="bash go-bootstrap"
options="!strip"
provides="go-bootstrap=$pkgver-r$pkgrel"
install=""
subpackages="$pkgname-doc"
source="http://golang.org/dl/go${pkgver/_/}.src.tar.gz
	go-tools-${pkgver/_/}.tar.gz::https://github.com/golang/tools/archive/${_toolsver}.tar.gz
	default-buildmode-pie.patch
	set-external-linker.patch
	"

# NOTE: building go for x86 with grsec kernel requires:
#           sysctl -w kernel.modify_ldt=1

if [ "$CBUILD" = "$CTARGET" ]; then
	makedepends="go-bootstrap $makedepends"
	provides="go-bootstrap=$pkgver-r$pkgrel"
	subpackages="$subpackages $pkgname-tools"
	_gotools="cover godoc stringer"
	_gocross="darwin freebsd openbsd windows"
else
	pkgname="go-bootstrap"
	makedepends="go $makedepends"
	# Go expect host linker instead of the cross-compiler
	export CC_FOR_TARGET="$CC"
	export CC="${HOSTLD:-gcc}"
	export CXX="${HOSTLD:-g++}"
	export LD="${HOSTLD:-ld}"
fi

_tooldir="$srcdir"/tools-${_toolsver}
for os in $_gocross; do
	subpackages="$subpackages $pkgname-cross-${os}:_crosspkg"
done

case "$CTARGET_ARCH" in
aarch64)export GOARCH="arm64" ;;
armhf)  export GOARCH="arm" GOARM=6 ;;
armv7)  export GOARCH="arm" GOARM=7 ;;
s390x)  export GOARCH="s390x" ;;
x86)    export GOARCH="386" GO386=387 ;;
x86_64) export GOARCH="amd64" ;;
ppc64le) export GOARCH="ppc64le" ;;
*)      die "Unsupported arch" ;;
esac

builddir="$srcdir"/go
build() {
	cd "$builddir/src"

	export GOOS="linux"
	export GOPATH="$srcdir"
	export GOROOT="$builddir"
	export GOBIN="$GOROOT"/bin
	export GOROOT_FINAL=/usr/lib/go
	local p; for p in /usr/lib/go-bootstrap /usr/lib/go-linux-$GOARCH-bootstrap /usr/lib/go; do
		if [ -d "$p" ]; then
			export GOROOT_BOOTSTRAP="$p"
			break
		fi
	done

	./make.bash
	for os in $_gocross; do
                local hostarch="$GOARCH"
		for arch in "386" "amd64"; do
			GOHOSTARCH=$hostarch GOARCH=$arch GOOS=$os ./make.bash
		done
	done

	# copied from bootstrap.bash to fixup cross-built bootstrap go
	if [ "$CBUILD" != "$CTARGET" ]; then
		local gohostos="$(../bin/go env GOHOSTOS)"
		local gohostarch="$(../bin/go env GOHOSTARCH)"
		mv ../bin/*_*/* ../bin
		rmdir ../bin/*_*
		rm -rf "../pkg/${gohostos}_${gohostarch}"* "../pkg/tool/${gohostos}_${gohostarch}"*
		rm -rf ../pkg/bootstrap ../pkg/obj
	fi

	# FIXME some tests fail:
	# PATH="$GOROOT/bin:$PATH" ./run.bash -no-rebuild

	mkdir -p "$GOPATH"/src/golang.org/x/tools
	cp -r "$_tooldir"/* "$GOPATH"/src/golang.org/x/tools

	for tool in $_gotools; do
		"$GOROOT"/bin/go install golang.org/x/tools/cmd/$tool
	done
}

package() {
	cd "$builddir"
	mkdir -p "$pkgdir"/usr/bin "$pkgdir"/usr/lib/go/bin "$pkgdir"/usr/share/doc/go

	for binary in go gofmt; do
		install -Dm755 bin/"$binary" "$pkgdir"/usr/lib/go/bin/"$binary"
		ln -s /usr/lib/go/bin/"$binary" "$pkgdir"/usr/bin/
	done

	cp -a pkg lib "$pkgdir"/usr/lib/go
	cp -r doc misc "$pkgdir"/usr/share/doc/go
	rm -rf "$pkgdir"/usr/lib/go/pkg/bootstrap
	rm -f  "$pkgdir"/usr/lib/go/pkg/tool/*/api

	# The source needs to be installed due to an upstream
	# bug (https://github.com/golang/go/issues/2775).
	# When this is resolved we can split out the source to a
	# go-src sub package.
	mkdir -p "$pkgdir"/usr/lib/go/
	cp -a "$builddir"/src "$pkgdir"/usr/lib/go

	# Remove tests from /usr/lib/go/src.
	# Those shouldn't be affacted by the upstream bug (see above).
	find "$pkgdir"/usr/lib/go/src \( -type f -a -name "*_test.go" \) \
		-exec rm -rf \{\} \+
	find "$pkgdir"/usr/lib/go/src \( -type d -a -name "testdata" \) \
		-exec rm -rf \{\} \+
	find "$pkgdir"/usr/lib/go/src -type f -a \( -name "*.bash" -o -name "*.rc" -o -name "*.bat" \) \
		-exec rm -rf \{\} \+
}

tools() {
	pkgdesc="Go programming language tools"
	depends="$pkgname"

	mkdir -p "$subpkgdir"/usr/bin "$subpkgdir"/usr/lib/go/bin \
		"$subpkgdir"/usr/lib/go/pkg/tool/linux_$GOARCH

	for tool in $_gotools; do
		if [ -f "$pkgdir"/usr/lib/go/pkg/tool/linux_$GOARCH/$tool ]; then
			mv "$pkgdir"/usr/lib/go/pkg/tool/linux_$GOARCH/$tool \
				"$subpkgdir"/usr/lib/go/pkg/tool/linux_$GOARCH/$tool
		fi
		if [ -f "$builddir/bin/$tool" ]; then
			install -Dm755 "$builddir/bin/$tool" "$subpkgdir"/usr/lib/go/bin/"$tool"
			ln -s /usr/lib/go/bin/"$tool" "$subpkgdir"/usr/bin/
		fi
	done
}

_crosspkg() {
	local name="$(echo "${subpkgname}" | cut -d '-' -f3)"
	pkgdesc="Go cross compiler for $name"
	depends="$pkgname"

	mkdir -p "$subpkgdir"/usr/lib/go/pkg/tool/
	mv "$pkgdir"/usr/lib/go/pkg/tool/${name}_* \
		"$subpkgdir"/usr/lib/go/pkg/tool/
	mv "$pkgdir"/usr/lib/go/pkg/${name}_* \
		"$subpkgdir"/usr/lib/go/pkg/
}

sha512sums="c6e67dd9e3acdf2aa776d920f91f3fb1802d624ba5d51e06b2c7c6b71bcfaf91f4024f7a442cecde69175c589f7f1163f0ae86d887e15ddde710e53ce0961284  go1.8.3.src.tar.gz
343fca47f250278b22df1c1cd92cce91e01009043d05d8ccce095e4386fa0f5ca8ccaa58232635332c7288ceca9d2a240f774f8bb3b08129a681a582cba60248  go-tools-1.8.3.tar.gz
9857c71108652b8907117abf0b41ded5e332bcf864320235aadbf3a7b6afbfc0e5051f91fe143f0654b4c8d6fe9adbe7d22ca2ce50cd75c0ab7a050dfb437773  default-buildmode-pie.patch
6b36f3780ab10e5c4902473a8ab5c0417220ece584b537517e9e60979bdc5a548ed14dd2546605392c89ec5ea6691769d337d34e2e19b92eba5bbca1898f4ada  set-external-linker.patch"