community/go: cross-build support

community/go/APKBUILD

@@ -15,24 +15,37 @@ makedepends="bash go-bootstrap"
 options="!strip"
 provides="go-bootstrap=$pkgver-r$pkgrel"
 install=""
-subpackages="$pkgname-doc $pkgname-tools"
+subpackages="$pkgname-doc"
 source="http://golang.org/dl/go${pkgver/_/}.src.tar.gz
-	$pkgname-tools-${pkgver/_/}.tar.gz::https://github.com/golang/tools/archive/${_toolsver}.tar.gz
+	go-tools-${pkgver/_/}.tar.gz::https://github.com/golang/tools/archive/${_toolsver}.tar.gz
 	default-buildmode-pie.patch
 	"
 
 # NOTE: building go for x86 with grsec kernel requires:
 #           sysctl -w kernel.modify_ldt=1
 
-_gotools="cover godoc stringer"
-_tooldir="$srcdir"/tools-${_toolsver}
+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
 
-_gocross="darwin freebsd openbsd windows"
+_tooldir="$srcdir"/tools-${_toolsver}
 for os in $_gocross; do
 	subpackages="$subpackages $pkgname-cross-${os}:_crosspkg"
 done
 
-builddir="$srcdir"/$pkgname
+builddir="$srcdir"/go
 build() {
 	cd "$builddir/src"
 
@@ -46,6 +59,7 @@ build() {
 	*)      die "Unsupported arch" ;;
 	esac
 
+	export GOOS="linux"
 	export GOPATH="$srcdir"
 	export GOROOT="$builddir"
 	export GOBIN="$GOROOT"/bin
@@ -64,6 +78,16 @@ build() {
 		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 || return 1
 

scripts/bootstrap.sh

@@ -20,7 +20,10 @@ CBUILDROOT="$(CTARGET=$TARGET_ARCH . /usr/share/abuild/functions.sh ; echo $CBUI
 [ -e "$APORTS/main/build-base" ] || die "Unable to deduce aports base checkout"
 
 apkbuildname() {
-	echo $APORTS/main/$1/APKBUILD
+	local repo="${1%%/*}"
+	local pkg="${1##*/}"
+	[ "$repo" = "$1" ] && repo="main"
+	echo $APORTS/$repo/$pkg/APKBUILD
 }
 
 msg() {
@@ -100,6 +103,7 @@ for PKG in fortify-headers linux-headers musl libc-dev pkgconf zlib \
 	   attr libcap patch sudo acl fakeroot tar \
 	   pax-utils abuild openssh \
 	   ncurses util-linux lvm2 popt xz cryptsetup kmod lddtree mkinitfs \
+	   community/go \
 	   $KERNEL_PKG ; do
 
 	CHOST=$TARGET_ARCH BOOTSTRAP=bootimage APKBUILD=$(apkbuildname $PKG) abuild -r