Makefile

VERSION:=$(shell git describe --exact-match --tags 2>/dev/null | sed 's/^v//')
ifeq ($(VERSION),)
    VERSION:=$(shell git rev-list -1 HEAD)
endif

export CGO_ENABLED=0
LDFLAGS=-X main.VERSION=$(VERSION) -s -w
GCFLAGS=

ALL_SOURCES:=$(wildcard *.go)
SOURCES:=$(filter-out %_test.go,$(ALL_SOURCES))
TEST_SOURCES:=$(wildcard *_test.go)

BINARIES=
define compile
dist/cidr-merger-$(1)-$(or $(3),$(2))$(if $(filter windows,$(1)),.exe): $$(SOURCES)
	mkdir -p $$(@D)
	GOOS=$(1) GOARCH=$(2) $(4) go build -ldflags "$$(LDFLAGS)" -gcflags "$$(GCFLAGS)" -o $$@
BINARIES+=dist/cidr-merger-$(1)-$(or $(3),$(2))$(if $(filter windows,$(1)),.exe)
endef

dist/cidr-merger: $(SOURCES)
	mkdir -p $(@D)
	go build -ldflags "$(LDFLAGS)" -gcflags "$(GCFLAGS)" -o $@

$(eval $(call compile,darwin,amd64))
$(eval $(call compile,darwin,arm64))
$(eval $(call compile,dragonfly,amd64))
$(eval $(call compile,freebsd,386))
$(eval $(call compile,freebsd,amd64))
$(eval $(call compile,linux,386))
$(eval $(call compile,linux,amd64))
$(eval $(call compile,linux,arm,arm5,GOARM=5))
$(eval $(call compile,linux,arm,arm6,GOARM=6))
$(eval $(call compile,linux,arm,arm7,GOARM=7))
$(eval $(call compile,linux,arm,arm8))
$(eval $(call compile,linux,arm64))
$(eval $(call compile,linux,mips,mips-hard,GOMIPS=hardfloat))
$(eval $(call compile,linux,mips,mips-soft,GOMIPS=softfloat))
$(eval $(call compile,linux,mipsle,mipsle-hard,GOMIPS=hardfloat))
$(eval $(call compile,linux,mipsle,mipsle-soft,GOMIPS=softfloat))
$(eval $(call compile,linux,mips64,mips64-hard,GOMIPS64=hardfloat))
$(eval $(call compile,linux,mips64,mips64-soft,GOMIPS64=softfloat))
$(eval $(call compile,linux,mips64le,mips64le-hard,GOMIPS64=hardfloat))
$(eval $(call compile,linux,mips64le,mips64le-soft,GOMIPS64=softfloat))
$(eval $(call compile,netbsd,386))
$(eval $(call compile,netbsd,amd64))
$(eval $(call compile,openbsd,386))
$(eval $(call compile,openbsd,amd64))
$(eval $(call compile,windows,386))
$(eval $(call compile,windows,amd64))

all: $(BINARIES)
.PHONY: all

define TEST_SCRIPT
set -e
test_dir=target/test
mkdir -p "$$test_dir"
for i in tests/*.in; do
    name="$${i##*/}"
    echo "running $$name"
    base="$$test_dir/$${name%.in}"
    "$$BIN" --range "$$i" >"$$base.range"
    "$$BIN" --cidr "$$i" >"$$base.cidr"
    "$$BIN" --range "$$base.cidr" >"$$base.cidr.range"
    diff -u "$$base.range" "$$base.cidr.range"
done
endef

test: export TEST_SCRIPT:=$(TEST_SCRIPT)
test: dist/cidr-merger $(TEST_SOURCES)
	go test
	BIN='$<' eval "$$TEST_SCRIPT"
.PHONY: test

clean:
	rm -rf dist
.PHONY: clean