Support building Windows SDK under Linux.

- envsetup.mk & config.mk: we define a new BUILD_OS and a minimal set
of things like BUILD_OUT to be able to use some local tools when
doing cross-compilation. This allows us to use the Linux version of
ACP when cross-compiling the tools to Windows.

- Makfile: include windows_sdk.mk when needed to build a Windows SDK.

- main.mk: support a win_sdk target (e.g. PRODUCT-sdk-win_sdk)

(Merge master Change I9d08d0df)

core/Makefile

@@ -1246,6 +1246,15 @@ $(INTERNAL_SDK_TARGET): $(deps)
 		cd $(dir $@) && zip -rq $(notdir $@) $(PRIVATE_NAME) \
 	) || ( rm -rf $(PRIVATE_DIR) $@ && exit 44 )
 
+
+# Is a Windows SDK requested? If so, we need some definitions from here
+# in order to find the Linux SDK used to create the Windows one.
+ifneq ($(filter win_sdk,$(MAKECMDGOALS)),)
+LINUX_SDK_NAME := $(sdk_name)
+LINUX_SDK_DIR  := $(sdk_dir)
+include $(TOPDIR)development/build/tools/windows_sdk.mk
+endif
+
 endif # !simulator
 
 # -----------------------------------------------------------------

core/config.mk

@@ -195,7 +195,6 @@ LEX:= flex
 YACC:= bison -d
 DOXYGEN:= doxygen
 AAPT := $(HOST_OUT_EXECUTABLES)/aapt$(HOST_EXECUTABLE_SUFFIX)
-ACP := $(HOST_OUT_EXECUTABLES)/acp$(HOST_EXECUTABLE_SUFFIX)
 AIDL := $(HOST_OUT_EXECUTABLES)/aidl$(HOST_EXECUTABLE_SUFFIX)
 ICUDATA := $(HOST_OUT_EXECUTABLES)/icudata$(HOST_EXECUTABLE_SUFFIX)
 SIGNAPK_JAR := $(HOST_OUT_JAVA_LIBRARIES)/signapk$(COMMON_JAVA_PACKAGE_SUFFIX)
@@ -214,6 +213,9 @@ JARJAR := java -jar $(HOST_OUT_JAVA_LIBRARIES)/jarjar.jar
 PROGUARD := external/proguard/bin/proguard.sh
 JAVATAGS := build/tools/java-event-log-tags.py
 
+# ACP is always for the build OS, not for the host OS
+ACP := $(BUILD_OUT_EXECUTABLES)/acp$(BUILD_EXECUTABLE_SUFFIX)
+
 # dx is java behind a shell script; no .exe necessary.
 DX := $(HOST_OUT_EXECUTABLES)/dx
 KCM := $(HOST_OUT_EXECUTABLES)/kcm$(HOST_EXECUTABLE_SUFFIX)

core/envsetup.mk

@@ -68,9 +68,17 @@ endif
 ifneq (,$(findstring CYGWIN,$(UNAME)))
 	HOST_OS := windows
 endif
+
+# BUILD_OS is the real host doing the build.
+BUILD_OS := $(HOST_OS)
+
+# Under Linux, if USE_MINGW is set, we change HOST_OS to Windows to build the
+# Windows SDK. Only a subset of tools and SDK will manage to build properly.
+ifeq ($(HOST_OS),linux)
 ifneq ($(USE_MINGW),)
 	HOST_OS := windows
 endif
+endif
 
 ifeq ($(HOST_OS),)
 $(error Unable to determine HOST_OS from uname -sm: $(UNAME)!)
@@ -86,6 +94,8 @@ ifneq (,$(findstring Power,$(UNAME)))
 	HOST_ARCH := ppc
 endif
 
+BUILD_ARCH := $(HOST_ARCH)
+
 ifeq ($(HOST_ARCH),)
 $(error Unable to determine HOST_ARCH from uname -sm: $(UNAME)!)
 endif
@@ -168,6 +178,8 @@ HOST_OUT_release := $(HOST_OUT_ROOT_release)/$(HOST_OS)-$(HOST_ARCH)
 HOST_OUT_debug := $(HOST_OUT_ROOT_debug)/$(HOST_OS)-$(HOST_ARCH)
 HOST_OUT := $(HOST_OUT_$(HOST_BUILD_TYPE))
 
+BUILD_OUT := $(OUT_DIR)/host/$(BUILD_OS)-$(BUILD_ARCH)
+
 ifeq ($(TARGET_SIMULATOR),true)
   # Any arch- or os-specific parts of the simulator (everything
   # under product/) are actually host-dependent.
@@ -185,6 +197,8 @@ PRODUCT_OUT := $(TARGET_PRODUCT_OUT_ROOT)/$(TARGET_DEVICE)
 
 OUT_DOCS := $(TARGET_COMMON_OUT_ROOT)/docs
 
+BUILD_OUT_EXECUTABLES:= $(BUILD_OUT)/bin
+
 HOST_OUT_EXECUTABLES:= $(HOST_OUT)/bin
 HOST_OUT_SHARED_LIBRARIES:= $(HOST_OUT)/lib
 HOST_OUT_JAVA_LIBRARIES:= $(HOST_OUT)/framework

core/main.mk

@@ -179,6 +179,9 @@ is_sdk_build :=
 ifneq ($(filter sdk,$(MAKECMDGOALS)),)
 is_sdk_build := true
 endif
+ifneq ($(filter win_sdk,$(MAKECMDGOALS)),)
+is_sdk_build := true
+endif
 ifneq ($(filter sdk_addon,$(MAKECMDGOALS)),)
 is_sdk_build := true
 endif
@@ -254,6 +257,7 @@ ifdef is_sdk_build
 ifneq ($(words $(filter-out $(INTERNAL_MODIFIER_TARGETS),$(MAKECMDGOALS))),1)
 $(error The 'sdk' target may not be specified with any other targets)
 endif
+
 # TODO: this should be eng I think.  Since the sdk is built from the eng
 # variant.
 tags_to_install := user debug eng