Makefile for WebRTC iOS development setup

Makefile

#
# Makefile for common task required to setup Google WebRTC repository
# for iOS development.
#
# This Makefile helps with the following steps:
# 
# * Download depot_tools and add to PATH (depot_tools is a
#     pre-requisite for WebRTC development)
# 
# * Use depot_tools / gclient to synchronize WebRTC source tree
#
# * Generate ninja projects with GYP flags targeting iOS
#
# * Convenience goals for building and installing AppRTCDemo
# 
SHELL := /bin/bash

.PHONY: clean cleanall sync compdb AppRTCDemo AppRTCDemo-install

CONFIGURATION ?= Debug-iphoneos
GYP_DEFINES="OS=ios target_arch=arm64 build_with_chromium=0"
OUT_DIR=src/out/$(CONFIGURATION)

clean:
	rm -rf src/out
	rm -rf .gclient

cleanall:
	rm -rf src
	rm -rf .gclient
	rm -rf .gclient_entries
	rm -rf depot_tools

# download depot_tools and gclient
depot_tools/gclient:
	git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git

# generate .gclient file used to sync WebRTC source
.gclient: depot_tools/gclient
	gclient config --name src https://chromium.googlesource.com/external/webrtc.git
	echo "target_os = [\"ios\"]" >> .gclient

# use gclient to synchronize WebRTC source tree
src: .gclient
	export PATH=depot_tools:$(PATH) && gclient sync

# generate ninja projects
$(OUT_DIR)/build.ninja: .gclient | src
	export PATH=$(realpath depot_tools):$(PATH) && \
	export GYP_CROSSCOMPILE=1 && \
	export GYP_DEFINES=$(GYP_DEFINES) && \
	cd src && python webrtc/build/gyp_webrtc	

# produce Clang/LLVM compatible compilation
$(OUT_DIR)/compile_commands.json: $(OUT_DIR)/build.ninja
	ninja -C $(OUT_DIR) -t compdb c cc cxx cc objc objcxx > $@

# build AppRTCDemo
$(OUT_DIR)/AppRTCDemo.app: $(OUT_DIR)/build.ninja
	ninja -C $(OUT_DIR)	AppRTCDemo

# sync with gclient
sync: .gclient
	export PATH=depot_tools:$(PATH) && gclient sync

# convenience goal to build AppRTCDemo
AppRTCDemo: $(OUT_DIR)/AppRTCDemo.app

# build & Install AppRTCDemo on iOS device
AppRTCDemo-install: $(OUT_DIR)/AppRTCDemo.app
	ideviceinstaller -i $<

# convenience goal to produce Clang/LLVM compatible compilation
# database
compdb: $(OUT_DIR)/compile_commands.json

# set DEFAULT_GOAL to generate ninja projects
.DEFAULT_GOAL := $(OUT_DIR)/build.ninja