Makefile/swift: update Makefile and add support for iOS

updates tailscale/tailscale#13937

Adds a Makefile for building various targets.  Adds support for building
iOS compatible libtailscale_ios.a.   Removes SOCKS5 support for iOS where
it looks like the CFNetwork support is lacking.

Author: barnstar

.gitignore

@@ -2,6 +2,8 @@ libtailscale.so
 libtailscale.a
 libtailscale.h
 libtailscale.tar*
+libtailscale_ios.a
+libtailscale_ios.h
 
 /tstestcontrol/libtstestcontrol.a
 /tstestcontrol/libtstestcontrol.h

Makefile

@@ -0,0 +1,59 @@
+# Copyright (c) Tailscale Inc & AUTHORS
+# SPDX-License-Identifier: BSD-3-Clause
+
+## Prettifies xcode output for xcode tests using xcpretty, if it is installed
+XCPRETTIFIER := xcpretty
+ifeq (, $(shell which $(XCPRETTIFIER)))
+        XCPRETTIFIER := cat
+endif
+
+OUTPUT_DIR=build
+
+libtailscale.a:
+	go build -buildmode=c-archive -o libtailscale.a
+
+libtailscale_ios.a:
+	GOOS=ios GOARCH=arm64 CGO_ENABLED=1 CC=$(PWD)/swift/script/clangwrap.sh go build -v -ldflags -w -tags ios -o libtailscale_ios.a -buildmode=c-archive
+
+.PHONY: archive-ios
+archive-ios: libtailscale_ios.a
+
+.PHONY: archive 
+archive: libtailscale.a  ## Builds libtailscale.a for the target platform
+
+# Builds a shared library for use with Swift Package Manager
+.PHONY: shared
+shared: ## Builds libtailscale.dylib for the target platform
+	go build -v -buildmode=c-shared
+
+.PHONY: tailscalekit-macos
+tailscalekit-macos: libtailscale.a ## Builds TailscaleKit for macos to swift/build/Build/Products/Release
+	cd swift && \
+	mkdir -p build && \
+	xcodebuild build -scheme "TailscaleKit (macOS)" -derivedDataPath build -configuration Release -destination 'platform=macOS,arch=arm64' | $(XCPRETTIFIER)
+
+.PHONY: tailscalekit-ios
+tailscalekit-ios: libtailscale_ios.a ## Builds TailscaleKit for iOS to swift/build/Build/Products/Release
+	cd swift && \
+	mkdir -p build && \
+	xcodebuild build -scheme "TailscaleKit (iOS)" -derivedDataPath build -configuration Release -destination 'generic/platform=iOS' | $(XCPRETTIFIER)
+
+.PHONY: test-macos
+test-macos: libtailscale.a ## Run tests for macOS
+	cd swift && \
+	xcodebuild test -scheme TailscaleKitXCTests -derivedDataPath build -configuration Debug -destination 'platform=macOS,arch=arm64' | $(XCPRETTIFIER)
+
+.PHONY: clean
+clean: ## Clean up build artifacts
+	rm -f libtailscale.a
+	rm -f libtailscale_ios.a
+	rm -f libtailscale.dylib
+	rm -rf swift/build
+
+.PHONY: help
+help: ## Show this help
+	@echo "\nSpecify a command. The choices are:\n"
+	@grep -hE '^[0-9a-zA-Z_-]+:.*?## .*$$' ${MAKEFILE_LIST} | awk 'BEGIN {FS = ":.*?## "}; {printf "  \033[0;36m%-12s\033[m %s\n", $$1, $$2}'
+	@echo ""
+
+.DEFAULT_GOAL := help