From fddb9490025c4c9b5fb1b77028a54fc92fa39c45 Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" Date: Fri, 12 Oct 2018 01:12:00 +0200 Subject: [PATCH] Do not build if nothing to do --- Makefile | 37 ++++++++++++++++++++++--------------- 1 file changed, 22 insertions(+), 15 deletions(-) diff --git a/Makefile b/Makefile index 6b95f89..46d35cb 100644 --- a/Makefile +++ b/Makefile @@ -1,26 +1,33 @@ PREFIX ?= /usr DESTDIR ?= BINDIR ?= $(PREFIX)/bin - -ifeq ($(shell go env GOOS),linux) -ifeq ($(wildcard .git),) -$(error Do not build this for Linux. Instead use the Linux kernel module. See wireguard.com/install/ for more info.) -else -$(shell printf 'package main\nconst UseTheKernelModuleInstead = 0xdeadbabe\n' > ireallywantobuildon_linux.go) -endif -endif - export GOPATH ?= $(CURDIR)/.gopath -all: wireguard-go +default: generate-version-and-build -version.go: +ifeq ($(shell go env GOOS)|$(wildcard .git),linux|) +$(error Do not build this for Linux. Instead use the Linux kernel module. See wireguard.com/install/ for more info.) +else +ireallywantobuildon_linux.go: + @printf "WARNING: This software is meant for use on non-Linux\nsystems. For Linux, please use the kernel module\ninstead. See wireguard.com/install/ for more info.\n\n" >&2 + @printf 'package main\nconst UseTheKernelModuleInstead = 0xdeadbabe\n' > "$@" +clean-ireallywantobuildon_linux.go: + @rm -f ireallywantobuildon_linux.go +.PHONY: clean-ireallywantobuildon_linux.go +clean: clean-ireallywantobuildon_linux.go +wireguard-go: ireallywantobuildon_linux.go +endif + +MAKEFLAGS += --no-print-directory + +generate-version-and-build: @export GIT_CEILING_DIRECTORIES="$(realpath $(CURDIR)/..)" && \ tag="$$(git describe --dirty 2>/dev/null)" && \ ver="$$(printf 'package main\nconst WireGuardGoVersion = "%s"\n' "$$tag")" && \ - [ "$$(cat $@ 2>/dev/null)" != "$$ver" ] && \ - echo "$$ver" > $@ && \ - git update-index --assume-unchanged $@ || true + [ "$$(cat version.go 2>/dev/null)" != "$$ver" ] && \ + echo "$$ver" > version.go && \ + git update-index --assume-unchanged version.go || true + @$(MAKE) wireguard-go wireguard-go: $(wildcard *.go) $(wildcard */*.go) go build -v -o "$@" @@ -31,4 +38,4 @@ install: wireguard-go clean: rm -f wireguard-go -.PHONY: clean install version.go +.PHONY: default clean install generate-version-and-build