diff --git a/core/binary.mk b/core/binary.mk
index 9fa968d..92b08fa 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -213,10 +213,15 @@
 ## Please note that we will do option filtering during FDO build.
 ## i.e. Os->O2, remove -fno-early-inline and -finline-limit.
 ##################################################################
-ifeq ($(strip $(LOCAL_FDO_SUPPORT)), true)
-  ifeq ($(strip $(LOCAL_IS_HOST_MODULE)),)
-    my_cflags += $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_FDO_CFLAGS)
-    my_ldflags += $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_FDO_LDFLAGS)
+my_fdo_build :=
+ifneq ($(filter true always, $(LOCAL_FDO_SUPPORT)),)
+  ifeq ($(BUILD_FDO_INSTRUMENT),true)
+    my_cflags += $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_FDO_INSTRUMENT_CFLAGS)
+    my_ldflags += $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_FDO_INSTRUMENT_LDFLAGS)
+    my_fdo_build := true
+  else ifneq ($(filter true,$(BUILD_FDO_OPTIMIZE))$(filter always,$(LOCAL_FDO_SUPPORT)),)
+    my_cflags += $($(LOCAL_2ND_ARCH_VAR_PREFIX)TARGET_FDO_OPTIMIZE_CFLAGS)
+    my_fdo_build := true
   endif
 endif
 
@@ -1045,19 +1050,10 @@
 my_ldflags := $(call $(LOCAL_2ND_ARCH_VAR_PREFIX)convert-to-$(my_host)clang-flags,$(my_ldflags))
 endif
 
-ifeq ($(LOCAL_FDO_SUPPORT), true)
-  build_with_fdo := false
-  ifeq ($(BUILD_FDO_INSTRUMENT), true)
-    build_with_fdo := true
-  endif
-  ifeq ($(BUILD_FDO_OPTIMIZE), true)
-    build_with_fdo := true
-  endif
-  ifeq ($(build_with_fdo), true)
-    my_cflags := $(patsubst -Os,-O2,$(my_cflags))
-    fdo_incompatible_flags=-fno-early-inlining -finline-limit=%
-    my_cflags := $(filter-out $(fdo_incompatible_flags),$(my_cflags))
-  endif
+ifeq ($(my_fdo_build), true)
+  my_cflags := $(patsubst -Os,-O2,$(my_cflags))
+  fdo_incompatible_flags := -fno-early-inlining -finline-limit=%
+  my_cflags := $(filter-out $(fdo_incompatible_flags),$(my_cflags))
 endif
 
 $(LOCAL_INTERMEDIATE_TARGETS): PRIVATE_YACCFLAGS := $(LOCAL_YACCFLAGS)
diff --git a/core/combo/fdo.mk b/core/combo/fdo.mk
index 9e331b6..8fb8fd3 100644
--- a/core/combo/fdo.mk
+++ b/core/combo/fdo.mk
@@ -18,22 +18,16 @@
 
 $(combo_2nd_arch_prefix)TARGET_FDO_CFLAGS:=
 
-ifeq ($(strip $(BUILD_FDO_INSTRUMENT)), true)
-  # Set BUILD_FDO_INSTRUMENT=true to turn on FDO instrumentation.
-  # The profile will be generated on /sdcard/fdo_profile on the device.
-  $(combo_2nd_arch_prefix)TARGET_FDO_CFLAGS := -fprofile-generate=/sdcard/fdo_profile -DANDROID_FDO
-  $(combo_2nd_arch_prefix)TARGET_FDO_LDFLAGS := -lgcov -lgcc
-else
-  ifeq ($(strip $(BUILD_FDO_OPTIMIZE)), true)
-    # Set TARGET_FDO_PROFILE_PATH to set a custom profile directory for your build.
-    ifeq ($(strip $($(combo_2nd_arch_prefix)TARGET_FDO_PROFILE_PATH)),)
-      $(combo_2nd_arch_prefix)TARGET_FDO_PROFILE_PATH := vendor/google_data/fdo_profile
-    endif
+# Set BUILD_FDO_INSTRUMENT=true to turn on FDO instrumentation.
+# The profile will be generated on /sdcard/fdo_profile on the device.
+$(combo_2nd_arch_prefix)TARGET_FDO_INSTRUMENT_CFLAGS := -fprofile-generate=/sdcard/fdo_profile -DANDROID_FDO
+$(combo_2nd_arch_prefix)TARGET_FDO_INSTRUMENT_LDFLAGS := -lgcov -lgcc
 
-    ifneq ($(strip $(wildcard $($(combo_2nd_arch_prefix)TARGET_FDO_PROFILE_PATH)/$(PRODUCT_OUT))),)
-      $(combo_2nd_arch_prefix)TARGET_FDO_CFLAGS := -fprofile-use=$($(combo_2nd_arch_prefix)TARGET_FDO_PROFILE_PATH) -DANDROID_FDO -fprofile-correction -Wcoverage-mismatch -Wno-error
-    else
-      $(warning Profile directory $($(combo_2nd_arch_prefix)TARGET_FDO_PROFILE_PATH)/$(PRODUCT_OUT) does not exist. Turn off FDO.)
-    endif
-  endif
+# Set TARGET_FDO_PROFILE_PATH to set a custom profile directory for your build.
+ifeq ($(strip $($(combo_2nd_arch_prefix)TARGET_FDO_PROFILE_PATH)),)
+  $(combo_2nd_arch_prefix)TARGET_FDO_PROFILE_PATH := vendor/google_data/fdo_profile
 endif
+
+$(combo_2nd_arch_prefix)TARGET_FDO_OPTIMIZE_CFLAGS := \
+    -fprofile-use=$($(combo_2nd_arch_prefix)TARGET_FDO_PROFILE_PATH) \
+    -DANDROID_FDO -fprofile-correction -Wcoverage-mismatch -Wno-error