go: build for all supported OSs

srcpkgs/go/template

@@ -36,21 +36,25 @@ do_build() {
 
 	export GOROOT=$PWD
 	export GOROOT_FINAL="/usr/lib/go"
-	export GOOS=linux
+	export GOOS=
+	export GOARCH=
 	export GOPATH=/tmp
 	mkdir -p $GOPATH/src
 
 	cd src
 
-	# TODO We could very well also build windows and darwin
-	# cross-compilers here, at no added complexity
-
-	# Build ARM, x86 and x86_64 compilers
-	for arch in arm 386 amd64; do
-		export GOARCH=$arch
-		bash make.bash --no-clean
+	GOOS=linux
+	GOARCH=arm
+	bash make.bash --no-clean
+	for os in darwin freebsd linux windows; do
+		for arch in 386 amd64; do
+			GOARCH=$arch
+			GOOS=$os
+			bash make.bash --no-clean
+		done
 	done
 
+	GOOS=linux
 	GOARCH=$targetarch
 
 	hg clone -u release-branch.go${version} \