Add build for macOS

Author: Andreas Huber

Makefile

@@ -12,15 +12,15 @@ SHELL = /bin/bash
 BUILD = go build
 MKDIR = mkdir -p
 
-.PHONY: build build_linux build_win tag_checked_out mostlyclean
+.PHONY: build build_linux build_win build_mac_amd64 build_mac_arm64 tag_checked_out mostlyclean
 
 all:
-	@echo choose a target from: build build_linux build_win mostlyclean
+	@echo choose a target from: build build_linux build_win build_mac_amd64 build_mac_arm64 mostlyclean
 	@echo prepend \`make BUILDTAG=1\` to checkout the highest git tag before building
 	@echo or set BUILDTAG to a specific tag
 
 # Build all binaries
-build: build_linux build_win
+build: build_linux build_win build_mac_amd64 build_mac_arm64
 
 # if BUILDTAG == 1 set it to the highest git tag
 ifeq ($(strip $(BUILDTAG)),1)
@@ -29,7 +29,7 @@ endif
 
 ifdef BUILDTAG
 # add the git tag checkout to the requirements of our build targets
-build_linux build_win: tag_checked_out
+build_linux build_win build_mac_amd64 build_mac_arm64: tag_checked_out
 endif
 
 tag_checked_out:
@@ -67,15 +67,19 @@ LDFLAGS = -ldflags "-X github.com/csaf-poc/csaf_distribution/v3/util.SemVersion=
 GOARCH = amd64
 build_linux: GOOS = linux
 build_win: GOOS = windows
+build_mac_amd64: GOOS = darwin
 
-build_linux build_win:
+build_mac_arm64: GOARCH = arm64
+build_mac_arm64: GOOS = darwin
+
+build_linux build_win build_mac_amd64 build_mac_arm64:
 	$(eval BINDIR = bin-$(GOOS)-$(GOARCH)/ )
 	$(MKDIR) $(BINDIR)
 	env GOARCH=$(GOARCH) GOOS=$(GOOS) $(BUILD) -o $(BINDIR) $(LDFLAGS) -v ./cmd/...
 
 
 DISTDIR := csaf_distribution-$(SEMVER)
-dist: build_linux build_win
+dist: build_linux build_win build_mac_amd64 build_mac_arm64
 	mkdir -p dist
 	mkdir -p dist/$(DISTDIR)-windows-amd64/bin-windows-amd64
 	cp README.md dist/$(DISTDIR)-windows-amd64

README.md

@@ -47,9 +47,11 @@ Download the binaries from the most recent release assets on Github.
 
 - Build Go components Makefile supplies the following targets:
 	- Build For GNU/Linux System: `make build_linux`
-	- Build For Windows System (cross build): `make build_win`
-    - Build For both linux and windows: `make build`
-	- Build from a specific github tag by passing the intended tag to the `BUILDTAG` variable.
+    - Build For Windows System (cross build): `make build_win`
+    - Build For macOS on Intel Processor (AMD64) (cross build): `make build_mac_amd64`
+    - Build For macOS on Apple Silicon (ARM64) (cross build): `make build_mac_arm64`
+    - Build For Linux, Mac and Windows: `make build`
+	- Build from a specific GitHub tag by passing the intended tag to the `BUILDTAG` variable.
 	   E.g. `make BUILDTAG=v1.0.0 build` or `make BUILDTAG=1 build_linux`.
      The special value `1` means checking out the highest github tag for the build.
     - Remove the generated binaries und their directories: `make mostlyclean`