Golang multi-arch makefile

Makefile

PLATFORMS := windows/386 windows/amd64 linux/386 linux/amd64 linux/arm linux/arm64

export CGO_ENABLED = 0
export GO386 = softfloat

parts = $(subst /, ,$@)
export GOOS = $(word 1,$(parts))
export GOARCH = $(word 2,$(parts))
export EXT = $(if $(filter windows,$(GOOS)),exe,bin)

release: clean $(PLATFORMS)

clean:
	rm -rf bin
	mkdir -p bin

$(PLATFORMS):
	go build -ldflags="-s -w" -o "bin/program-$(GOOS)_$(GOARCH).$(EXT)" .

.PHONY: clean release $(PLATFORMS)