Documentation and cleanup of makefile.

Author: freakboy3742

Makefile

@@ -7,7 +7,19 @@ IOSSDKROOT=$DEVROOT/SDKs/iPhoneOS$(SDKVER).sdk
 PYTHON_VERSION=2.7.1
 FFI_VERSION=3.0.13
 
-all: dirs libffi
+all: working-dirs build/ffi.framework
+
+# Clean all builds
+clean:
+	rm -rf src build
+
+# Full clean - includes all downloaded products
+distclean: clean
+	rm -rf downloads
+
+###########################################################################
+# Working directories
+###########################################################################
 
 download:
 	mkdir -p downloads
@@ -18,7 +30,11 @@ src:
 build:
 	mkdir -p build
 
-dirs: download src build
+working-dirs: download src build
+
+###########################################################################
+# libFFI
+###########################################################################
 
 # Clean the libffi project
 clean-libffi:
@@ -35,28 +51,19 @@ src/libffi-$(FFI_VERSION): downloads/libffi-$(FFI_VERSION).tar.gz
 	mv libffi-$(FFI_VERSION) src
 
 # Patch libffi source with iOS patches
-# Produce a dummy ".patches-applied" file to mark that this has happened.
-src/libffi-$(FFI_VERSION)/.patches-applied: src/libffi-$(FFI_VERSION)
-	cd src/libffi-$(FFI_VERSION) && patch -p1 < ../../patch/libffi/$(FFI_VERSION)/ffi-sysv.S.patch
-	cd src/libffi-$(FFI_VERSION) && patch -p1 < ../../patch/libffi/$(FFI_VERSION)/project.pbxproj.patch
-	touch src/libffi-$(FFI_VERSION)/.patches-applied
+# Produce a dummy "patches-applied" file to mark that this has happened.
+src/libffi-$(FFI_VERSION)/patches-applied: src/libffi-$(FFI_VERSION)
+	cd src/libffi-$(FFI_VERSION) && patch -p1 -N < ../../patch/libffi/$(FFI_VERSION)/ffi-sysv.S.patch
+	cd src/libffi-$(FFI_VERSION) && patch -p1 -N < ../../patch/libffi/$(FFI_VERSION)/project.pbxproj.patch | tee patches-applied
 
 # Generate iOS specific source and headers
-src/libffi-$(FFI_VERSION)/ios/include/ffi.h: src/libffi-$(FFI_VERSION)/.patches-applied
+src/libffi-$(FFI_VERSION)/ios/include/ffi.h: src/libffi-$(FFI_VERSION)/patches-applied
 	cd src/libffi-$(FFI_VERSION) && python generate-ios-source-and-headers.py
 
 # Build the iOS project
 src/libffi-$(FFI_VERSION)/build/Release-universal/ffi.framework: src/libffi-$(FFI_VERSION)/ios/include/ffi.h
 	cd src/libffi-$(FFI_VERSION) && xcodebuild -project libffi.xcodeproj -target "Framework" -configuration Release -sdk iphoneos$(SDKVER) OTHER_CFLAGS="-no-integrated-as"
 
 # Collate the libffi project
-libffi: clean-libffi src/libffi-$(FFI_VERSION)/build/Release-universal/ffi.framework
+build/ffi.framework: src/libffi-$(FFI_VERSION)/build/Release-universal/ffi.framework
 	cp -a src/libffi-$(FFI_VERSION)/build/Release-universal/ffi.framework build
-
-# Clean all builds
-clean:
-	rm -rf src build
-
-# Full clean - includes all downloaded products
-distclean: clean
-	rm -rf downloads