diff --git a/adb/Android.mk b/adb/Android.mk
index 41016ee..bbdc2ea 100644
--- a/adb/Android.mk
+++ b/adb/Android.mk
@@ -5,12 +5,6 @@
 
 LOCAL_PATH:= $(call my-dir)
 
-ifeq ($(HOST_OS),windows)
-    adb_host_clang := false  # libc++ for mingw not ready yet.
-else
-    adb_host_clang := true
-endif
-
 adb_host_sanitize :=
 adb_target_sanitize :=
 
@@ -29,8 +23,6 @@
 ADB_COMMON_windows_CFLAGS := \
     -DUNICODE=1 -D_UNICODE=1 \
 
-ADB_COMMON_CFLAGS += $(ADB_COMMON_$(HOST_OS)_CFLAGS)
-
 # libadb
 # =========================================================
 
@@ -63,7 +55,8 @@
 LIBADB_linux_CFLAGS := \
     -std=c++14 \
 
-LIBADB_CFLAGS += $(LIBADB_$(HOST_OS)_CFLAGS)
+LIBADB_windows_CFLAGS := \
+    $(ADB_COMMON_windows_CFLAGS) \
 
 LIBADB_darwin_SRC_FILES := \
     fdevent.cpp \
@@ -97,7 +90,6 @@
     usb_linux_client.cpp \
 
 LOCAL_SANITIZE := $(adb_target_sanitize)
-LOCAL_SHARED_LIBRARIES := libbase
 
 # Even though we're building a static library (and thus there's no link step for
 # this to take effect), this adds the includes to our path.
@@ -106,24 +98,27 @@
 include $(BUILD_STATIC_LIBRARY)
 
 include $(CLEAR_VARS)
-LOCAL_CLANG := $(adb_host_clang)
 LOCAL_MODULE := libadb
+LOCAL_MODULE_HOST_OS := darwin linux windows
 LOCAL_CFLAGS := $(LIBADB_CFLAGS) -DADB_HOST=1
+LOCAL_CFLAGS_windows := $(LIBADB_windows_CFLAGS)
+LOCAL_CFLAGS_linux := $(LIBADB_linux_CFLAGS)
 LOCAL_SRC_FILES := \
     $(LIBADB_SRC_FILES) \
-    $(LIBADB_$(HOST_OS)_SRC_FILES) \
     adb_auth_host.cpp \
 
+LOCAL_SRC_FILES_darwin := $(LIBADB_darwin_SRC_FILES)
+LOCAL_SRC_FILES_linux := $(LIBADB_linux_SRC_FILES)
+LOCAL_SRC_FILES_windows := $(LIBADB_windows_SRC_FILES)
+
 LOCAL_SANITIZE := $(adb_host_sanitize)
-LOCAL_SHARED_LIBRARIES := libbase
 
 # Even though we're building a static library (and thus there's no link step for
 # this to take effect), this adds the includes to our path.
 LOCAL_STATIC_LIBRARIES := libcrypto_static libbase
 
-ifeq ($(HOST_OS),windows)
-    LOCAL_C_INCLUDES += development/host/windows/usb/api/
-else
+LOCAL_C_INCLUDES_windows := development/host/windows/usb/api/
+ifneq ($(HOST_OS),windows)
     LOCAL_MULTILIB := 64
 endif
 
@@ -146,14 +141,13 @@
 # =========================================================
 
 include $(CLEAR_VARS)
-LOCAL_CLANG := $(adb_host_clang)
 LOCAL_MODULE := adb_test
 LOCAL_CFLAGS := -DADB_HOST=1 $(LIBADB_CFLAGS)
-LOCAL_SRC_FILES := \
-    $(LIBADB_TEST_SRCS) \
-    $(LIBADB_TEST_$(HOST_OS)_SRCS) \
-    services.cpp \
-
+LOCAL_CFLAGS_windows := $(LIBADB_windows_CFLAGS)
+LOCAL_CFLAGS_linux := $(LIBADB_linux_CFLAGS)
+LOCAL_SRC_FILES := $(LIBADB_TEST_SRCS) services.cpp
+LOCAL_SRC_FILES_linux := $(LIBADB_TEST_linux_SRCS)
+LOCAL_SRC_FILES_darwin := $(LIBADB_TEST_darwin_SRCS)
 LOCAL_SANITIZE := $(adb_host_sanitize)
 LOCAL_SHARED_LIBRARIES := liblog libbase
 LOCAL_STATIC_LIBRARIES := \
@@ -161,18 +155,10 @@
     libcrypto_static \
     libcutils \
 
-ifeq ($(HOST_OS),linux)
-    LOCAL_LDLIBS += -lrt -ldl -lpthread
-endif
-
-ifeq ($(HOST_OS),darwin)
-    LOCAL_LDLIBS += -framework CoreFoundation -framework IOKit
-endif
-
-ifeq ($(HOST_OS),windows)
-    LOCAL_LDLIBS += -lws2_32 -luserenv
-    LOCAL_STATIC_LIBRARIES += AdbWinApi
-endif
+LOCAL_LDLIBS_linux := -lrt -ldl -lpthread
+LOCAL_LDLIBS_darwin := -framework CoreFoundation -framework IOKit
+LOCAL_LDLIBS_windows := -lws2_32 -luserenv
+LOCAL_STATIC_LIBRARIES_windows := AdbWinApi
 
 include $(BUILD_HOST_NATIVE_TEST)
 
@@ -181,9 +167,10 @@
 
 ifeq ($(HOST_OS),linux)
 include $(CLEAR_VARS)
-LOCAL_CLANG := $(adb_host_clang)
 LOCAL_MODULE := adb_device_tracker_test
 LOCAL_CFLAGS := -DADB_HOST=1 $(LIBADB_CFLAGS)
+LOCAL_CFLAGS_windows := $(LIBADB_windows_CFLAGS)
+LOCAL_CFLAGS_linux := $(LIBADB_linux_CFLAGS)
 LOCAL_SRC_FILES := test_track_devices.cpp
 LOCAL_SANITIZE := $(adb_host_sanitize)
 LOCAL_SHARED_LIBRARIES := liblog libbase
@@ -196,23 +183,16 @@
 # =========================================================
 include $(CLEAR_VARS)
 
-ifeq ($(HOST_OS),linux)
-    LOCAL_LDLIBS += -lrt -ldl -lpthread
-endif
+LOCAL_LDLIBS_linux := -lrt -ldl -lpthread
 
-ifeq ($(HOST_OS),darwin)
-    LOCAL_LDLIBS += -lpthread -framework CoreFoundation -framework IOKit -framework Carbon
-    LOCAL_CFLAGS += -Wno-sizeof-pointer-memaccess -Wno-unused-parameter
-endif
+LOCAL_LDLIBS_darwin := -lpthread -framework CoreFoundation -framework IOKit -framework Carbon
+LOCAL_CFLAGS_darwin := -Wno-sizeof-pointer-memaccess -Wno-unused-parameter
 
-ifeq ($(HOST_OS),windows)
-    # Use wmain instead of main
-    LOCAL_LDFLAGS += -municode
-    LOCAL_LDLIBS += -lws2_32 -lgdi32
-    EXTRA_STATIC_LIBS := AdbWinApi
-endif
-
-LOCAL_CLANG := $(adb_host_clang)
+# Use wmain instead of main
+LOCAL_LDFLAGS_windows := -municode
+LOCAL_LDLIBS_windows := -lws2_32 -lgdi32
+LOCAL_STATIC_LIBRARIES_windows := AdbWinApi
+LOCAL_REQUIRED_MODULES_windows := AdbWinApi AdbWinUsbApi
 
 LOCAL_SRC_FILES := \
     client/main.cpp \
@@ -227,8 +207,12 @@
     -D_GNU_SOURCE \
     -DADB_HOST=1 \
 
+LOCAL_CFLAGS_windows := \
+    $(ADB_COMMON_windows_CFLAGS)
+
 LOCAL_MODULE := adb
 LOCAL_MODULE_TAGS := debug
+LOCAL_MODULE_HOST_OS := darwin linux windows
 
 LOCAL_SANITIZE := $(adb_host_sanitize)
 LOCAL_STATIC_LIBRARIES := \
@@ -237,12 +221,8 @@
     libcrypto_static \
     libcutils \
     liblog \
-    $(EXTRA_STATIC_LIBS) \
 
-# libc++ not available on windows yet
-ifneq ($(HOST_OS),windows)
-    LOCAL_CXX_STL := libc++_static
-endif
+LOCAL_CXX_STL := libc++_static
 
 # Don't add anything here, we don't want additional shared dependencies
 # on the host adb tool, and shared libraries that link against libc++
@@ -253,12 +233,6 @@
 
 $(call dist-for-goals,dist_files sdk,$(LOCAL_BUILT_MODULE))
 
-ifeq ($(HOST_OS),windows)
-$(LOCAL_INSTALLED_MODULE): \
-    $(HOST_OUT_EXECUTABLES)/AdbWinApi.dll \
-    $(HOST_OUT_EXECUTABLES)/AdbWinUsbApi.dll
-endif
-
 
 # adbd device daemon
 # =========================================================
diff --git a/base/Android.mk b/base/Android.mk
index 4e135f6..51dd736 100644
--- a/base/Android.mk
+++ b/base/Android.mk
@@ -68,6 +68,7 @@
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
 LOCAL_STATIC_LIBRARIES := libcutils
 LOCAL_MULTILIB := both
+LOCAL_MODULE_HOST_OS := darwin linux windows
 include $(BUILD_HOST_STATIC_LIBRARY)
 
 include $(CLEAR_VARS)
diff --git a/fastboot/Android.mk b/fastboot/Android.mk
index ce8e15f..3f201ec 100644
--- a/fastboot/Android.mk
+++ b/fastboot/Android.mk
@@ -24,38 +24,25 @@
 LOCAL_SRC_FILES := protocol.cpp engine.cpp bootimg_utils.cpp fastboot.cpp util.cpp fs.cpp
 LOCAL_MODULE := fastboot
 LOCAL_MODULE_TAGS := debug
+LOCAL_MODULE_HOST_OS := darwin linux windows
 LOCAL_CONLYFLAGS += -std=gnu99
 LOCAL_CFLAGS += -Wall -Wextra -Werror -Wunreachable-code
 
 LOCAL_CFLAGS += -DFASTBOOT_REVISION='"$(fastboot_version)"'
 
-ifeq ($(HOST_OS),linux)
-  LOCAL_SRC_FILES += usb_linux.cpp util_linux.cpp
-endif
+LOCAL_SRC_FILES_linux := usb_linux.cpp util_linux.cpp
 
-ifeq ($(HOST_OS),darwin)
-  LOCAL_SRC_FILES += usb_osx.cpp util_osx.cpp
-  LOCAL_LDLIBS += -lpthread -framework CoreFoundation -framework IOKit -framework Carbon
-  LOCAL_CFLAGS += -Wno-unused-parameter
-endif
+LOCAL_SRC_FILES_darwin := usb_osx.cpp util_osx.cpp
+LOCAL_LDLIBS_darwin := -lpthread -framework CoreFoundation -framework IOKit -framework Carbon
+LOCAL_CFLAGS_darwin := -Wno-unused-parameter
 
-ifeq ($(HOST_OS),windows)
-  LOCAL_SRC_FILES += usb_windows.cpp util_windows.cpp
-  EXTRA_STATIC_LIBS := AdbWinApi
-  ifneq ($(strip $(USE_CYGWIN)),)
-    # Pure cygwin case
-    LOCAL_LDLIBS += -lpthread
-  endif
-  ifneq ($(strip $(USE_MINGW)),)
-    # MinGW under Linux case
-    LOCAL_LDLIBS += -lws2_32
-    USE_SYSDEPS_WIN32 := 1
-  endif
-  LOCAL_C_INCLUDES += development/host/windows/usb/api
-endif
+LOCAL_SRC_FILES_windows := usb_windows.cpp util_windows.cpp
+LOCAL_STATIC_LIBRARIES_windows := AdbWinApi
+LOCAL_REQUIRED_MODULES_windows := AdbWinApi
+LOCAL_LDLIBS_windows := -lws2_32
+LOCAL_C_INCLUDES_windows := development/host/windows/usb/api
 
 LOCAL_STATIC_LIBRARIES := \
-    $(EXTRA_STATIC_LIBS) \
     libziparchive-host \
     libext4_utils_host \
     libsparse_host \
@@ -64,24 +51,18 @@
     libz \
     libbase
 
-ifneq ($(HOST_OS),windows)
-LOCAL_STATIC_LIBRARIES += libselinux
-endif # HOST_OS != windows
+LOCAL_STATIC_LIBRARIES_darwin := libselinux
+LOCAL_STATIC_LIBRARIES_linux := libselinux
 
-ifeq ($(HOST_OS),linux)
 # libf2fs_dlutils_host will dlopen("libf2fs_fmt_host_dyn")
-LOCAL_CFLAGS += -DUSE_F2FS
-LOCAL_LDFLAGS += -ldl -rdynamic -Wl,-rpath,.
-LOCAL_REQUIRED_MODULES := libf2fs_fmt_host_dyn
+LOCAL_CFLAGS_linux := -DUSE_F2FS
+LOCAL_LDFLAGS_linux := -ldl -rdynamic -Wl,-rpath,.
+LOCAL_REQUIRED_MODULES_linux := libf2fs_fmt_host_dyn
 # The following libf2fs_* are from system/extras/f2fs_utils,
 # and do not use code in external/f2fs-tools.
-LOCAL_STATIC_LIBRARIES += libf2fs_utils_host libf2fs_ioutils_host libf2fs_dlutils_host
-endif
+LOCAL_STATIC_LIBRARIES_linux += libf2fs_utils_host libf2fs_ioutils_host libf2fs_dlutils_host
 
-# libc++ not available on windows yet
-ifneq ($(HOST_OS),windows)
-    LOCAL_CXX_STL := libc++_static
-endif
+LOCAL_CXX_STL := libc++_static
 
 # Don't add anything here, we don't want additional shared dependencies
 # on the host fastboot tool, and shared libraries that link against libc++
@@ -104,7 +85,3 @@
 LOCAL_CFLAGS := -Werror
 include $(BUILD_HOST_EXECUTABLE)
 endif
-
-ifeq ($(HOST_OS),windows)
-$(LOCAL_INSTALLED_MODULE): $(HOST_OUT_EXECUTABLES)/AdbWinApi.dll
-endif
diff --git a/libcutils/Android.mk b/libcutils/Android.mk
index f9060c4..015bd3f 100644
--- a/libcutils/Android.mk
+++ b/libcutils/Android.mk
@@ -37,19 +37,7 @@
 # some files must not be compiled when building against Mingw
 # they correspond to features not used by our host development tools
 # which are also hard or even impossible to port to native Win32
-WINDOWS_HOST_ONLY :=
-ifeq ($(HOST_OS),windows)
-    ifeq ($(strip $(USE_CYGWIN)),)
-        WINDOWS_HOST_ONLY := 1
-    endif
-endif
-# USE_MINGW is defined when we build against Mingw on Linux
-ifneq ($(strip $(USE_MINGW)),)
-    WINDOWS_HOST_ONLY := 1
-endif
-
-ifneq ($(WINDOWS_HOST_ONLY),1)
-    commonSources += \
+nonWindowsSources := \
         fs.c \
         multiuser.c \
         socket_inaddr_any_server.c \
@@ -60,31 +48,32 @@
         socket_network_client.c \
         sockets.c \
 
-    commonHostSources += \
+nonWindowsHostSources := \
         ashmem-host.c \
         trace-host.c
 
-endif
-
 
 # Shared and static library for host
 # ========================================================
 LOCAL_MODULE := libcutils
-LOCAL_SRC_FILES := $(commonSources) $(commonHostSources) dlmalloc_stubs.c
+LOCAL_SRC_FILES := $(commonSources) dlmalloc_stubs.c
+LOCAL_SRC_FILES_darwin := $(nonWindowsSources) $(nonWindowsHostSources)
+LOCAL_SRC_FILES_linux := $(nonWindowsSources) $(nonWindowsHostSources)
 LOCAL_STATIC_LIBRARIES := liblog
-ifneq ($(HOST_OS),windows)
-LOCAL_CFLAGS += -Werror -Wall -Wextra
-endif
+LOCAL_CFLAGS_darwin := -Werror -Wall -Wextra
+LOCAL_CFLAGS_linux := -Werror -Wall -Wextra
 LOCAL_MULTILIB := both
+LOCAL_MODULE_HOST_OS := darwin linux windows
 include $(BUILD_HOST_STATIC_LIBRARY)
 
 include $(CLEAR_VARS)
 LOCAL_MODULE := libcutils
-LOCAL_SRC_FILES := $(commonSources) $(commonHostSources) dlmalloc_stubs.c
+LOCAL_SRC_FILES := $(commonSources) dlmalloc_stubs.c
+LOCAL_SRC_FILES_darwin := $(nonWindowsSources) $(nonWindowsHostSources)
+LOCAL_SRC_FILES_linux := $(nonWindowsSources) $(nonWindowsHostSources)
 LOCAL_SHARED_LIBRARIES := liblog
-ifneq ($(HOST_OS),windows)
-LOCAL_CFLAGS += -Werror -Wall -Wextra
-endif
+LOCAL_CFLAGS_darwin := -Werror -Wall -Wextra
+LOCAL_CFLAGS_linux := -Werror -Wall -Wextra
 LOCAL_MULTILIB := both
 include $(BUILD_HOST_SHARED_LIBRARY)
 
@@ -96,6 +85,7 @@
 include $(CLEAR_VARS)
 LOCAL_MODULE := libcutils
 LOCAL_SRC_FILES := $(commonSources) \
+        $(nonWindowsSources) \
         android_reboot.c \
         ashmem-dev.c \
         debugger.c \
diff --git a/liblog/Android.mk b/liblog/Android.mk
index 5eed634..3a1a9db 100644
--- a/liblog/Android.mk
+++ b/liblog/Android.mk
@@ -24,41 +24,30 @@
 # so make sure we do not regret hard-coding it as follows:
 liblog_cflags := -DLIBLOG_LOG_TAG=1005
 
-liblog_sources := logd_write.c log_event_write.c
-
-# some files must not be compiled when building against Mingw
-# they correspond to features not used by our host development tools
-# which are also hard or even impossible to port to native Win32
-
-ifeq ($(strip $(USE_MINGW)),)
-    liblog_sources += \
-        event_tag_map.c
-else
-    liblog_sources += \
-        uio.c
-endif
-
-liblog_host_sources := $(liblog_sources) fake_log_device.c event.logtags
-liblog_target_sources := $(liblog_sources) log_time.cpp log_is_loggable.c
-ifeq ($(strip $(USE_MINGW)),)
+liblog_host_sources := logd_write.c log_event_write.c fake_log_device.c event.logtags
+liblog_target_sources := logd_write.c log_event_write.c event_tag_map.c log_time.cpp log_is_loggable.c
 liblog_target_sources += logprint.c
-endif
 liblog_target_sources += log_read.c
 
 # Shared and static library for host
 # ========================================================
 LOCAL_MODULE := liblog
 LOCAL_SRC_FILES := $(liblog_host_sources)
+# some files must not be compiled when building against Mingw
+# they correspond to features not used by our host development tools
+# which are also hard or even impossible to port to native Win32
+LOCAL_SRC_FILES_darwin := event_tag_map.c
+LOCAL_SRC_FILES_linux := event_tag_map.c
+LOCAL_SRC_FILES_windows := uio.c
 LOCAL_CFLAGS := -DFAKE_LOG_DEVICE=1 -Werror $(liblog_cflags)
 LOCAL_MULTILIB := both
+LOCAL_MODULE_HOST_OS := darwin linux windows
 include $(BUILD_HOST_STATIC_LIBRARY)
 
 include $(CLEAR_VARS)
 LOCAL_MODULE := liblog
 LOCAL_WHOLE_STATIC_LIBRARIES := liblog
-ifeq ($(strip $(HOST_OS)),linux)
-LOCAL_LDLIBS := -lrt
-endif
+LOCAL_LDLIBS_linux := -lrt
 LOCAL_MULTILIB := both
 LOCAL_CXX_STL := none
 include $(BUILD_HOST_SHARED_LIBRARY)
diff --git a/libsparse/Android.mk b/libsparse/Android.mk
index 925b98b..c77eba9 100644
--- a/libsparse/Android.mk
+++ b/libsparse/Android.mk
@@ -18,6 +18,7 @@
 LOCAL_STATIC_LIBRARIES := libz
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
 LOCAL_CFLAGS := -Werror
+LOCAL_MODULE_HOST_OS := darwin linux windows
 include $(BUILD_HOST_STATIC_LIBRARY)
 
 
diff --git a/libutils/Android.mk b/libutils/Android.mk
index 8226db2..1039096 100644
--- a/libutils/Android.mk
+++ b/libutils/Android.mk
@@ -43,27 +43,19 @@
 
 host_commonCflags := -DLIBUTILS_NATIVE=1 $(TOOL_CFLAGS) -Werror
 
-ifeq ($(HOST_OS),windows)
-ifeq ($(strip $(USE_CYGWIN),),)
-# Under MinGW, ctype.h doesn't need multi-byte support
-host_commonCflags += -DMB_CUR_MAX=1
-endif
-endif
-
 # For the host
 # =====================================================
 include $(CLEAR_VARS)
 LOCAL_SRC_FILES:= $(commonSources)
-ifeq ($(HOST_OS), linux)
-LOCAL_SRC_FILES += Looper.cpp
-endif
-ifeq ($(HOST_OS),darwin)
-LOCAL_CFLAGS += -Wno-unused-parameter
-endif
+LOCAL_SRC_FILES_linux := Looper.cpp
+LOCAL_CFLAGS_darwin := -Wno-unused-parameter
 LOCAL_MODULE:= libutils
 LOCAL_STATIC_LIBRARIES := liblog
 LOCAL_CFLAGS += $(host_commonCflags)
+# Under MinGW, ctype.h doesn't need multi-byte support
+LOCAL_CFLAGS_windows := -DMB_CUR_MAX=1
 LOCAL_MULTILIB := both
+LOCAL_MODULE_HOST_OS := darwin linux windows
 include $(BUILD_HOST_STATIC_LIBRARY)
 
 
diff --git a/libziparchive/Android.mk b/libziparchive/Android.mk
index 559c48b..608ff1c 100644
--- a/libziparchive/Android.mk
+++ b/libziparchive/Android.mk
@@ -33,10 +33,9 @@
 LOCAL_STATIC_LIBRARIES := libz libutils libbase
 LOCAL_MODULE:= libziparchive-host
 LOCAL_CFLAGS := -Werror
-ifneq ($(strip $(USE_MINGW)),)
-	LOCAL_CFLAGS += -mno-ms-bitfields
-endif
+LOCAL_CFLAGS_windows := -mno-ms-bitfields
 LOCAL_MULTILIB := both
+LOCAL_MODULE_HOST_OS := darwin linux windows
 include $(BUILD_HOST_STATIC_LIBRARY)
 
 include $(CLEAR_VARS)