Makefile: make cross-building more flexible [skip ci]

.travis.yml

@@ -42,8 +42,9 @@ jobs:
       go: "1.12"
       script: make e2e
     - stage: release
-      script: make build
-      go: "1.12.1" # explicit version to ease reproducibility
+      script: make release GOARCHES="amd64 arm arm64"
+      go: "1.12.7" # explicit version to ease reproducibility
+      if: tag IS present
       deploy:
         provider: releases
         api_key:

Makefile

@@ -1,12 +1,19 @@
-VERSION=`git describe --tags --dirty --always`
+VERSION := $(shell git describe --tags --dirty --always)
 
-GOFLAGS=-ldflags "-X main.version=${VERSION}" -gcflags=all=-trimpath=$(PWD) -asmflags=all=-trimpath=$(PWD)
+GOFLAGS := -ldflags "-X main.version=$(VERSION)" -gcflags=all=-trimpath=$(PWD) -asmflags=all=-trimpath=$(PWD)
+
+GOARCHES := $(shell go env GOARCH)
 
 build:
-	GOARCH=amd64 go build ${GOFLAGS} -o wesher-amd64 ${OPTS}
-	GOARCH=arm go build ${GOFLAGS} -o wesher-arm ${OPTS}
-	GOARCH=arm64 go build ${GOFLAGS} -o wesher-arm64 ${OPTS}
+	$(foreach GOARCH,$(GOARCHES),GOARCH=$(GOARCH) go build ${GOFLAGS} -o wesher$(if $(filter-out $(GOARCH), $(GOARCHES)),-$(GOARCH));)
+
+release: build
 	sha256sum wesher-* > wesher.sha256sums
 
 e2e:
 	tests/e2e.sh
+
+clean:
+	rm -f wesher wesher-* wesher.sha256sums
+
+.PHONY: build release e2e clean