diff --git a/core/main.mk b/core/main.mk
index d9ff68e..c29731c 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -525,6 +525,9 @@
 # --mindepth=2 makes the prunes not work.
 subdir_makefiles := \
 	$(shell build/tools/findleaves.py $(FIND_LEAVES_EXCLUDES) $(subdirs) Android.mk)
+ifeq ($(USE_SOONG),true)
+subdir_makefiles := $(SOONG_ANDROID_MK) $(subdir_makefiles)
+endif
 
 $(foreach mk, $(subdir_makefiles), $(info including $(mk) ...)$(eval include $(mk)))
 
@@ -866,6 +869,9 @@
 
 .PHONY: checkbuild
 checkbuild: $(modules_to_check) droid_targets
+ifeq ($(USE_SOONG),true)
+checkbuild: checkbuild-soong
+endif
 ifeq (true,$(ANDROID_BUILD_EVERYTHING_BY_DEFAULT))
 droid: checkbuild
 endif
diff --git a/core/ninja.mk b/core/ninja.mk
index 862ed80..750aae5 100644
--- a/core/ninja.mk
+++ b/core/ninja.mk
@@ -118,21 +118,34 @@
 NINJA_MAKEPARALLEL := $(MAKEPARALLEL) --ninja
 endif
 
+ifeq ($(USE_SOONG),true)
+include $(BUILD_SYSTEM)/soong.mk
+
+COMBINED_BUILD_NINJA := $(OUT_DIR)/combined$(KATI_NINJA_SUFFIX).ninja
+
+$(COMBINED_BUILD_NINJA): $(KATI_BUILD_NINJA) $(SOONG_ANDROID_MK)
+	$(hide) echo "builddir = $(OUT_DIR)" > $(COMBINED_BUILD_NINJA)
+	$(hide) echo "subninja $(SOONG_BUILD_NINJA)" >> $(COMBINED_BUILD_NINJA)
+	$(hide) echo "subninja $(KATI_BUILD_NINJA)" >> $(COMBINED_BUILD_NINJA)
+else
+COMBINED_BUILD_NINJA := $(KATI_BUILD_NINJA)
+endif
+
 $(sort $(DEFAULT_GOAL) $(ANDROID_GOALS)) : ninja_wrapper
 	@#empty
 
 .PHONY: ninja_wrapper
-ninja_wrapper: $(KATI_BUILD_NINJA) $(MAKEPARALLEL)
+ninja_wrapper: $(COMBINED_BUILD_NINJA) $(MAKEPARALLEL)
 	@echo Starting build with ninja
-	+$(hide) export NINJA_STATUS="$(NINJA_STATUS)" && source $(KATI_ENV_SH) && $(NINJA_MAKEPARALLEL) $(NINJA) $(NINJA_GOALS) -C $(TOP) -f $(KATI_BUILD_NINJA) $(NINJA_ARGS)
+	+$(hide) export NINJA_STATUS="$(NINJA_STATUS)" && source $(KATI_ENV_SH) && $(NINJA_MAKEPARALLEL) $(NINJA) $(NINJA_GOALS) -C $(TOP) -f $(COMBINED_BUILD_NINJA) $(NINJA_ARGS)
 
 KATI_FIND_EMULATOR := --use_find_emulator
 ifeq ($(KATI_EMULATE_FIND),false)
   KATI_FIND_EMULATOR :=
 endif
-$(KATI_BUILD_NINJA): $(KATI) $(MAKEPARALLEL) FORCE
+$(KATI_BUILD_NINJA): $(KATI) $(MAKEPARALLEL) $(SOONG_ANDROID_MK) FORCE
 	@echo Running kati to generate build$(KATI_NINJA_SUFFIX).ninja...
-	+$(hide) $(KATI_MAKEPARALLEL) $(KATI) --ninja --ninja_dir=$(OUT_DIR) --ninja_suffix=$(KATI_NINJA_SUFFIX) --regen --ignore_dirty=$(OUT_DIR)/% --ignore_optional_include=$(OUT_DIR)/%.P --detect_android_echo $(KATI_FIND_EMULATOR) -f build/core/main.mk $(KATI_GOALS) --gen_all_targets BUILDING_WITH_NINJA=true
+	+$(hide) $(KATI_MAKEPARALLEL) $(KATI) --ninja --ninja_dir=$(OUT_DIR) --ninja_suffix=$(KATI_NINJA_SUFFIX) --regen --ignore_dirty=$(OUT_DIR)/% --no_ignore_dirty=$(SOONG_ANDROID_MK) --ignore_optional_include=$(OUT_DIR)/%.P --detect_android_echo $(KATI_FIND_EMULATOR) -f build/core/main.mk $(KATI_GOALS) --gen_all_targets BUILDING_WITH_NINJA=true SOONG_ANDROID_MK=$(SOONG_ANDROID_MK)
 
 KATI_CXX := $(CLANG_CXX) $(CLANG_HOST_GLOBAL_CFLAGS) $(CLANG_HOST_GLOBAL_CPPFLAGS)
 KATI_LD := $(CLANG_CXX) $(CLANG_HOST_GLOBAL_LDFLAGS)
diff --git a/core/soong.mk b/core/soong.mk
new file mode 100644
index 0000000..63ea9a7
--- /dev/null
+++ b/core/soong.mk
@@ -0,0 +1,55 @@
+SOONG_OUT_DIR := $(OUT_DIR)/soong
+SOONG := $(SOONG_OUT_DIR)/soong
+SOONG_BUILD_NINJA := $(SOONG_OUT_DIR)/build.ninja
+SOONG_ANDROID_MK := $(SOONG_OUT_DIR)/Android.mk
+SOONG_VARIABLES := $(SOONG_OUT_DIR)/soong.variables
+
+ifeq (,$(filter /%,$(SOONG_OUT_DIR)))
+SOONG_TOP_RELPATH := $(shell python -c "import os; print os.path.relpath('$(TOP)', '$(SOONG_OUT_DIR)')")
+else
+SOONG_TOP_RELPATH := $(realpath $(TOP))
+endif
+
+# Bootstrap soong.  Run only the first time for clean builds
+$(SOONG):
+	$(hide) mkdir -p $(dir $@)
+	$(hide) cd $(dir $@) && $(SOONG_TOP_RELPATH)/bootstrap.bash
+
+# Create soong.variables with copies of makefile settings.  Runs every build,
+# but only updates soong.variables if it changes
+SOONG_VARIABLES_TMP := $(SOONG_VARIABLES).$$$$
+$(SOONG_VARIABLES): FORCE
+	$(hide) mkdir -p $(dir $@)
+	$(hide) (\
+	echo '{'; \
+	echo '    "Device_uses_jemalloc": $(if $(filter dlmalloc,$(MALLOC_IMPL)),false,true),'; \
+	echo '    "Device_uses_dlmalloc": $(if $(filter dlmalloc,$(MALLOC_IMPL)),true,false),'; \
+	echo '    $(if $(BOARD_MALLOC_ALIGNMENT),"Dlmalloc_alignment": $(BOARD_MALLOC_ALIGNMENT)$(comma),)'; \
+	echo '    "Platform_sdk_version": $(PLATFORM_SDK_VERSION),'; \
+	echo '    "Unbundled_build": $(if $(TARGET_BUILD_APPS),true,false),'; \
+	echo '    "Brillo": $(if $(BRILLO),true,false),'; \
+	echo ''; \
+	echo '    "DeviceName": "$(TARGET_DEVICE)",'; \
+	echo '    "DeviceArch": "$(TARGET_ARCH)",'; \
+	echo '    "DeviceArchVariant": "$(TARGET_ARCH_VARIANT)",'; \
+	echo '    "DeviceCpuVariant": "$(TARGET_CPU_VARIANT)",'; \
+	echo '    "DeviceAbi": ["$(TARGET_CPU_ABI)", "$(TARGET_CPU_ABI2)"],'; \
+	echo '    "DeviceUsesClang": $(if $(USE_CLANG_PLATFORM_BUILD),$(USE_CLANG_PLATFORM_BUILD),false),'; \
+	echo ''; \
+	echo '    "DeviceSecondaryArch": "$(TARGET_2ND_ARCH)",'; \
+	echo '    "DeviceSecondaryArchVariant": "$(TARGET_2ND_ARCH_VARIANT)",'; \
+	echo '    "DeviceSecondaryCpuVariant": "$(TARGET_2ND_CPU_VARIANT)",'; \
+	echo '    "DeviceSecondaryAbi": ["$(TARGET_2ND_CPU_ABI)", "$(TARGET_2ND_CPU_ABI2)"],'; \
+	echo ''; \
+	echo '    "HostArch": "$(HOST_ARCH)",'; \
+	echo '    "HostSecondaryArch": "$(HOST_2ND_ARCH)"'; \
+	echo '}') > $(SOONG_VARIABLES_TMP); \
+	if ! cmp -s $(SOONG_VARIABLES_TMP) $(SOONG_VARIABLES); then \
+	  mv $(SOONG_VARIABLES_TMP) $(SOONG_VARIABLES); \
+	else \
+	  rm $(SOONG_VARIABLES_TMP); \
+	fi
+
+# Build an Android.mk listing all soong outputs as prebuilts
+$(SOONG_ANDROID_MK): $(SOONG) $(SOONG_VARIABLES) FORCE
+	$(hide) $(SOONG) $(SOONG_BUILD_NINJA) $(NINJA_ARGS)