# Template file for 'go'
pkgname=go
_bootstrap_version=1.4.2
version=1.9.2
revision=2
wrksrc=go
hostmakedepends="git ca-certificates"
short_desc="The Go Programming Language"
maintainer="Orphaned <orphan@voidlinux.eu>"
homepage="http://golang.org/"
license="BSD"
distfiles="https://golang.org/dl/go${_bootstrap_version}.src.tar.gz
 https://golang.org/dl/go${version}.src.tar.gz"
checksum="299a6fd8f8adfdce15bc06bde926e7b252ae8e24dd5b16b7d8791ed79e7b5e9b
 665f184bf8ac89986cfd5a4460736976f60b57df6b320ad71ad4cef53bb143dc"

nostrip=yes
noverifyrdeps=yes

# https://github.com/voidlinux/xbps/issues/258
hostmakedepends+=" wget"
XBPS_FETCH_CMD=wget

_go_targetarch() {
	local hostarch targetarch

	case "$XBPS_MACHINE" in
		arm*) export hostarch=arm;;
		i686*) export hostarch=386;;
		x86_64*) export hostarch=amd64;;
	esac
	case "$XBPS_TARGET_MACHINE" in
		aarch64*) targetarch=arm64;;
		arm*) targetarch=arm;;
		i686*) targetarch=386;;
		x86_64*) targetarch=amd64;;
		*) targetarch=$hostarch;;
	esac
	echo $targetarch
}

do_extract() {
	mkdir "${XBPS_BUILDDIR}/go_bootstrap"
	tar -xf "${XBPS_SRCDISTDIR}/${pkgname}-${version}/go${_bootstrap_version}.src.tar.gz" \
		-C "${XBPS_BUILDDIR}/go_bootstrap" --strip-components=1

	tar -xf "${XBPS_SRCDISTDIR}/${pkgname}-${version}/go${version}.src.tar.gz" \
		-C "${XBPS_BUILDDIR}/go" --strip-components=1

	# Fix gcc6 warnings regarding signed shift left
	sed -i ${XBPS_BUILDDIR}/go_bootstrap/src/cmd/6c/txt.c \
		-e's;f->vconst |= (vlong)~0 << 32;f->vconst = (vlong)(~0ull << 32);'
	sed -i ${XBPS_BUILDDIR}/go_bootstrap/src/cmd/8g/ggen.c \
		-e's;-1LL<<(t->width\*8-1);~0ULL<<(t->width*8-1);'

	# Disable gcc7 fallthrough warnings
	sed -i ${XBPS_BUILDDIR}/go_bootstrap/src/make.bash \
		-e's;-Werror;-Werror -Wimplicit-fallthrough=0;'
	sed -i ${XBPS_BUILDDIR}/go_bootstrap/src/cmd/dist/build.c \
		-e's;"-Werror",;"-Werror", "-Wimplicit-fallthrough=0",;'
}

do_build() {
	unset GCC CC CXX LD CFLAGS

	local targetarch=$(_go_targetarch)
	export GOROOT=$PWD
	export GOROOT_FINAL="/usr/lib/go"
	export GOOS=
	export GOARCH=
	export GOPATH="${XBPS_BUILDDIR}/go_gopath"
	export GOROOT_BOOTSTRAP="${XBPS_BUILDDIR}/go_bootstrap"
	mkdir -p $GOPATH/src

	cd "${XBPS_BUILDDIR}/go_bootstrap/src"
	# Disable cgo when building the bootstrap compiler because Go
	# 1.4.2 won't build otherwise with new binutils. See
	# https://github.com/golang/go/issues/13896
	CGO_ENABLED=0 ./make.bash

	cd "${XBPS_BUILDDIR}/go/src"

	GOOS=linux
	GOARCH=arm
	bash make.bash --no-clean
	GOOS=linux
	GOARCH=arm64
	bash make.bash --no-clean
	for os in darwin freebsd linux windows; do
		for arch in 386 amd64; do
			GOARCH=$arch
			GOOS=$os
			bash make.bash --no-clean
		done
	done

	GOOS=linux
	GOARCH=$targetarch

	git clone https://go.googlesource.com/tools \
		-b release-branch.go$(echo "${version}" | cut -d "." -f "1-2") \
		$GOPATH/src/golang.org/x/tools

	$GOROOT/bin/go install golang.org/x/tools/cmd/godoc
}

do_install() {
	local bindir

	if [ "$CROSS_BUILD" ]; then
		case "$XBPS_TARGET_MACHINE" in
			aarch64*) bindir=bin/linux_arm64;;
			arm*) bindir=bin/linux_arm;;
			i686*) bindir=bin/linux_386;;
			x86_64*) bindir=bin/linux_amd64;;
		esac
	else
		bindir=bin
	fi

	vmkdir usr/bin
	vmkdir usr/lib/go
	vmkdir usr/share/go
	cp -d --preserve=all ${bindir}/* ${DESTDIR}/usr/bin || true
	cp -a pkg src lib ${DESTDIR}/usr/lib/go
	cp -r doc misc -t ${DESTDIR}/usr/share/go
	ln -s /usr/share/go/doc ${DESTDIR}/usr/lib/go/doc
	vlicense LICENSE

	# This is to make go get code.google.com/p/go-tour/gotour and
	# then running the gotour executable work out of the box.
	#
	# Also, /usr/bin is the place for system-wide executables,
	# not /usr/lib/go/bin. Users should use different paths by
	# setting the appropriate environment variables.
	#
	ln -sf /usr/bin ${DESTDIR}/usr/lib/go/bin

	# <dominikh> sigh. well, someone fix the template and add
	# a symlink, usr/lib/go/misc -> /usr/share/go/misc
	ln -sfr ${DESTDIR}/usr/share/go/misc ${DESTDIR}/usr/lib/go/misc

	# For godoc
	vbin ${XBPS_BUILDDIR}/go_gopath/${bindir}/godoc
	vinstall favicon.ico 644 usr/lib/go

	rm -f ${DESTDIR}/usr/share/go/doc/articles/wiki/get.bin
	rm -f ${DESTDIR}/usr/lib/go/pkg/tool/*/api
}

go-cross-linux_package() {
	nostrip=yes
	noverifyrdeps=yes
	depends="${sourcepkg}-${version}_${revision}"
	short_desc+=" - Cross compilers for Linux"
	pkg_install() {
		local targetarch=$(_go_targetarch)
		mkdir -p $PKGDESTDIR/usr/lib/go/pkg/tool/
		cd ${DESTDIR}/usr/lib/go/pkg/tool/
		for i in linux_*; do
			if [ "$i" != "linux_${targetarch}" ]; then
				mv "$i" $PKGDESTDIR/usr/lib/go/pkg/tool/
			fi
		done

		mkdir -p $PKGDESTDIR/usr/lib/go/pkg/
		cd ${DESTDIR}/usr/lib/go/pkg/
		for i in linux_*; do
			if [ "$i" != "linux_${targetarch}" ]; then
				mv "$i" $PKGDESTDIR/usr/lib/go/pkg/
			fi
		done
	}
}

go-cross-darwin_package() {
	nostrip=yes
	noverifyrdeps=yes
	depends="${sourcepkg}-${version}_${revision}"
	short_desc+=" - Cross compilers for Darwin"
	pkg_install() {
		vmove "usr/lib/go/pkg/tool/darwin_*"
		vmove "usr/lib/go/pkg/darwin_*"
	}
}

go-cross-freebsd_package() {
	nostrip=yes
	noverifyrdeps=yes
	depends="${sourcepkg}-${version}_${revision}"
	short_desc+=" - Cross compilers for FreeBSD"
	pkg_install() {
		vmove "usr/lib/go/pkg/tool/freebsd_*"
		vmove "usr/lib/go/pkg/freebsd_*"
	}
}


go-cross-windows_package() {
	nostrip=yes
	noverifyrdeps=yes
	depends="${sourcepkg}-${version}_${revision}"
	short_desc+=" - Cross compilers for Windows"
	pkg_install() {
		vmove "usr/lib/go/pkg/tool/windows_*"
		vmove "usr/lib/go/pkg/windows_*"
	}
}