diff --git a/core/base_rules.mk b/core/base_rules.mk
index 1135003..5363e0f 100644
--- a/core/base_rules.mk
+++ b/core/base_rules.mk
@@ -340,7 +340,7 @@
 
 ifneq (,$(LOCAL_SOONG_INSTALLED_MODULE))
   ifneq ($(LOCAL_MODULE_MAKEFILE),$(SOONG_ANDROID_MK))
-    $(call pretty-error, LOCAL_SOONG_INSTALLED_MODULE can only be used from $(SOONG_ANDROID_MK))
+    $(call pretty-error, LOCAL_MODULE_MAKEFILE can only be used from $(SOONG_ANDROID_MK))
   endif
   # Use the install path requested by Soong.
   LOCAL_INSTALLED_MODULE := $(LOCAL_SOONG_INSTALLED_MODULE)
diff --git a/core/config.mk b/core/config.mk
index 2f18add..0ecee8a 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -1266,8 +1266,15 @@
 # consistency with those defined in BoardConfig.mk files.
 include $(BUILD_SYSTEM)/android_soong_config_vars.mk
 
-SOONG_VARIABLES := $(SOONG_OUT_DIR)/soong.$(TARGET_PRODUCT).variables
-SOONG_EXTRA_VARIABLES := $(SOONG_OUT_DIR)/soong.$(TARGET_PRODUCT).extra.variables
+# EMMA_INSTRUMENT is set to true when coverage is enabled. Creates a suffix to
+# differeciate the coverage version of ninja files. This will save 5 minutes of
+# build time used to regenerate ninja.
+ifeq (true,$(EMMA_INSTRUMENT))
+COVERAGE_SUFFIX := .coverage
+endif
+
+SOONG_VARIABLES := $(SOONG_OUT_DIR)/soong.$(TARGET_PRODUCT)$(COVERAGE_SUFFIX).variables
+SOONG_EXTRA_VARIABLES := $(SOONG_OUT_DIR)/soong.$(TARGET_PRODUCT)$(COVERAGE_SUFFIX).extra.variables
 
 ifeq ($(CALLED_FROM_SETUP),true)
 include $(BUILD_SYSTEM)/ninja_config.mk
diff --git a/core/dex_preopt_config.mk b/core/dex_preopt_config.mk
index d51de33..f1e9fb5 100644
--- a/core/dex_preopt_config.mk
+++ b/core/dex_preopt_config.mk
@@ -1,4 +1,4 @@
-DEX_PREOPT_CONFIG := $(SOONG_OUT_DIR)/dexpreopt.config
+DEX_PREOPT_CONFIG := $(SOONG_OUT_DIR)/dexpreopt${COVERAGE_SUFFIX}.config
 
 ENABLE_PREOPT := true
 ENABLE_PREOPT_BOOT_IMAGES := true
diff --git a/core/main.mk b/core/main.mk
index 27ba526..85fd65c 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -31,8 +31,7 @@
 .KATI_READONLY := $(foreach n,$(SOONG_CONFIG_NAMESPACES),SOONG_CONFIG_$(n))
 .KATI_READONLY := $(foreach n,$(SOONG_CONFIG_NAMESPACES),$(foreach k,$(SOONG_CONFIG_$(n)),SOONG_CONFIG_$(n)_$(k)))
 
-include $(SOONG_MAKEVARS_MK)
-
+include $(SOONG_OUT_DIR)/make_vars-$(TARGET_PRODUCT)$(COVERAGE_SUFFIX).mk
 YACC :=$= $(BISON) -d
 
 include $(BUILD_SYSTEM)/clang/config.mk
@@ -276,12 +275,15 @@
 # Include all of the makefiles in the system
 #
 
-subdir_makefiles := $(SOONG_OUT_DIR)/installs-$(TARGET_PRODUCT).mk $(SOONG_ANDROID_MK)
+subdir_makefiles := $(SOONG_OUT_DIR)/installs-$(TARGET_PRODUCT)$(COVERAGE_SUFFIX).mk $(SOONG_ANDROID_MK)
+
 # Android.mk files are only used on Linux builds, Mac only supports Android.bp
 ifeq ($(HOST_OS),linux)
   subdir_makefiles += $(file <$(OUT_DIR)/.module_paths/Android.mk.list)
 endif
-subdir_makefiles += $(SOONG_OUT_DIR)/late-$(TARGET_PRODUCT).mk
+
+subdir_makefiles += $(SOONG_OUT_DIR)/late-$(TARGET_PRODUCT)$(COVERAGE_SUFFIX).mk
+
 subdir_makefiles_total := $(words int $(subdir_makefiles) post finish)
 .KATI_READONLY := subdir_makefiles_total
 
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 5769c06..14ea2aa 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -1,5 +1,5 @@
-SOONG_MAKEVARS_MK := $(SOONG_OUT_DIR)/make_vars-$(TARGET_PRODUCT).mk
-SOONG_ANDROID_MK := $(SOONG_OUT_DIR)/Android-$(TARGET_PRODUCT).mk
+SOONG_MAKEVARS_MK := $(SOONG_OUT_DIR)/make_vars-$(TARGET_PRODUCT)$(COVERAGE_SUFFIX).mk
+SOONG_ANDROID_MK := $(SOONG_OUT_DIR)/Android-$(TARGET_PRODUCT)$(COVERAGE_SUFFIX).mk
 
 include $(BUILD_SYSTEM)/art_config.mk
 include $(BUILD_SYSTEM)/dex_preopt_config.mk
@@ -26,7 +26,7 @@
 $(shell mkdir -p $(dir $(SOONG_VARIABLES)))
 $(call json_start)
 
-$(call add_json_str,  Make_suffix, -$(TARGET_PRODUCT))
+$(call add_json_str,  Make_suffix, -$(TARGET_PRODUCT)$(COVERAGE_SUFFIX))
 
 $(call add_json_str,  BuildId,                           $(BUILD_ID))
 $(call add_json_str,  BuildFingerprintFile,              build_fingerprint.txt)
diff --git a/core/tasks/module-info.mk b/core/tasks/module-info.mk
index 7593668..0ca27d8 100644
--- a/core/tasks/module-info.mk
+++ b/core/tasks/module-info.mk
@@ -13,7 +13,7 @@
 $(if $(strip $(2)),'$(COMMA)$(strip $(1)): "$(strip $(2))"')
 endef
 
-SOONG_MODULE_INFO := $(SOONG_OUT_DIR)/module-info-$(TARGET_PRODUCT).json
+SOONG_MODULE_INFO := $(SOONG_OUT_DIR)/module-info-$(TARGET_PRODUCT)${COVERAGE_SUFFIX}.json
 
 $(MODULE_INFO_JSON): PRIVATE_SOONG_MODULE_INFO := $(SOONG_MODULE_INFO)
 $(MODULE_INFO_JSON): PRIVATE_MERGE_JSON_OBJECTS := $(HOST_OUT_EXECUTABLES)/merge_module_info_json