Add windows as a supported cross-compile platform.

Add cross-compiling for supported platforms to our CircleCI builders.

Signed-off-by: Ying Li <ying.li@docker.com>

Makefile

@@ -13,7 +13,7 @@ endif
 CTIMEVAR=-X $(NOTARY_PKG)/version.GitCommit=$(GITCOMMIT) -X $(NOTARY_PKG)/version.NotaryVersion=$(NOTARY_VERSION)
 GO_LDFLAGS=-ldflags "-w $(CTIMEVAR)"
 GO_LDFLAGS_STATIC=-ldflags "-w $(CTIMEVAR) -extldflags -static"
-GOOSES = darwin linux
+GOOSES = darwin linux windows
 NOTARY_BUILDTAGS ?= pkcs11
 NOTARYDIR := /go/src/github.com/docker/notary
 

buildscripts/circle_parallelism.sh

@@ -8,6 +8,7 @@ case $CIRCLE_NODE_INDEX in
    ;;
 2) SKIPENVCHECK=1 make TESTDB=mysql testdb
    SKIPENVCHECK=1 make TESTDB=mysql integration
+   SKIPENVCHECK=1 make cross  # just trying not to exceed 5 builders
    ;;
 3) SKIPENVCHECK=1 make TESTDB=rethink testdb
    SKIPENVCHECK=1 make TESTDB=rethink integration

buildscripts/cross.sh

@@ -7,15 +7,9 @@
 
 GOARCH="amd64"
 
-if [[ "${NOTARY_BUILDTAGS}" == *pkcs11* ]]; then
-	export CGO_ENABLED=1
-else
-	export CGO_ENABLED=0
-fi
-
-
 for os in "$@"; do
 	export GOOS="${os}"
+	BUILDTAGS="${NOTARY_BUILDTAGS}"
 
 	if [[ "${GOOS}" == "darwin" ]]; then
 		export CC="o64-clang"
@@ -24,18 +18,28 @@ for os in "$@"; do
 		# darwin binaries can't be compiled to be completely static with the -static flag
 		LDFLAGS="-s"
 	else
+		# no building with Cgo.  Also no building with pkcs11
+		if [[ "${GOOS}" == "windows" ]]; then
+			BUILDTAGS=""
+		fi
 		unset CC
 		unset CXX
 		LDFLAGS="-extldflags -static"
 	fi
 
+	if [[ "${BUILDTAGS}" == *pkcs11* ]]; then
+		export CGO_ENABLED=1
+	else
+		export CGO_ENABLED=0
+	fi
+
 	mkdir -p "${NOTARYDIR}/cross/${GOOS}/${GOARCH}";
 
 	set -x;
 	go build \
 		-o "${NOTARYDIR}/cross/${GOOS}/${GOARCH}/notary" \
 		-a \
-		-tags "${NOTARY_BUILDTAGS}" \
+		-tags "${BUILDTAGS}" \
 		-ldflags "-w ${CTIMEVAR} ${LDFLAGS}"  \
 		./cmd/notary;
 	set +x;