Merge "Add default -Wall -Werror or -Wall."

core/Makefile

@@ -516,6 +516,20 @@ $(SOONG_TO_CONVERT): $(SOONG_CONV_DATA) $(SOONG_TO_CONVERT_SCRIPT)
 	$(hide) $(SOONG_TO_CONVERT_SCRIPT) $< >$@
 $(call dist-for-goals,droidcore,$(SOONG_TO_CONVERT))
 
+# -----------------------------------------------------------------
+# Modules use -Wno-error, or added default -Wall -Werror
+WALL_WERROR := $(PRODUCT_OUT)/wall_werror.txt
+$(WALL_WERROR):
+	@rm -f $@
+	echo "# Modules using -Wno-error" >> $@
+	for m in $(sort $(SOONG_MODULES_USING_WNO_ERROR) $(MODULES_USING_WNO_ERROR)); do echo $$m >> $@; done
+	echo "# Modules added default -Wall -Werror" >> $@
+	for m in $(sort $(SOONG_MODULES_ADDED_WERROR) $(MODULES_ADDED_WERROR)); do echo $$m >> $@; done
+	echo "# Modules added default -Wall" >> $@
+	for m in $(sort $(SOONG_MODULES_ADDED_WALL) $(MODULES_ADDED_WALL)); do echo $$m >> $@; done
+
+$(call dist-for-goals,droidcore,$(WALL_WERROR))
+
 # -----------------------------------------------------------------
 # The dev key is used to sign this package, and as the key required
 # for future OTA packages installed by this system.  Actual product

core/binary.mk

@@ -1664,13 +1664,31 @@ ifeq ($(my_strict),true)
     my_cflags += -DANDROID_STRICT
 endif
 
-# Add -Werror if LOCAL_PATH is in the WARNING_DISALLOWED project list,
-# or not in the WARNING_ALLOWED project list.
-ifneq (,$(strip $(call find_warning_disallowed_projects,$(LOCAL_PATH))))
-  my_cflags_no_override += -Werror
-else
-  ifeq (,$(strip $(call find_warning_allowed_projects,$(LOCAL_PATH))))
-    my_cflags_no_override += -Werror
+# Check if -Werror or -Wno-error is used in C compiler flags.
+# Modules defined in $(SOONG_ANDROID_MK) are checked in soong's cc.go.
+ifneq ($(LOCAL_MODULE_MAKEFILE),$(SOONG_ANDROID_MK))
+  # Header libraries do not need cflags.
+  ifneq (HEADER_LIBRARIES,$(LOCAL_MODULE_CLASS))
+    # Prebuilt modules do not need cflags.
+    ifeq (,$(LOCAL_PREBUILT_MODULE_FILE))
+      my_all_cflags := $(my_cflags) $(my_cppflags) $(my_cflags_no_override)
+      # Issue warning if -Wno-error is used.
+      ifneq (,$(filter -Wno-error,$(my_all_cflags)))
+        $(eval MODULES_USING_WNO_ERROR := $(MODULES_USING_WNO_ERROR) $(LOCAL_MODULE_MAKEFILE):$(LOCAL_MODULE))
+      else
+        # Issue warning if -Werror is not used. Add it.
+        ifeq (,$(filter -Werror,$(my_all_cflags)))
+          # Add -Wall -Werror unless the project is in the WARNING_ALLOWED project list.
+          ifeq (,$(strip $(call find_warning_allowed_projects,$(LOCAL_PATH))))
+            $(eval MODULES_ADDED_WERROR := $(MODULES_ADDED_WERROR) $(LOCAL_MODULE_MAKEFILE):$(LOCAL_MODULE))
+            my_cflags := -Wall -Werror $(my_cflags)
+          else
+            $(eval MODULES_ADDED_WALL := $(MODULES_ADDED_WALL) $(LOCAL_MODULE_MAKEFILE):$(LOCAL_MODULE))
+            my_cflags := -Wall $(my_cflags)
+          endif
+        endif
+      endif
+    endif
   endif
 endif
 

core/config.mk

@@ -898,38 +898,7 @@ else
 APPS_DEFAULT_VERSION_NAME := $(PLATFORM_VERSION)
 endif
 
-# Projects clean of compiler warnings should be compiled with -Werror.
-# If most modules in a directory such as external/ have warnings,
-# the directory should be in ANDROID_WARNING_ALLOWED_PROJECTS list.
-# When some of its subdirectories are cleaned up, the subdirectories
-# can be added into ANDROID_WARNING_DISALLOWED_PROJECTS list, e.g.
-# external/fio/.
-ANDROID_WARNING_DISALLOWED_PROJECTS := \
-    art/% \
-    bionic/% \
-    external/fio/% \
-    hardware/interfaces/% \
-
-define find_warning_disallowed_projects
-    $(filter $(ANDROID_WARNING_DISALLOWED_PROJECTS),$(1)/)
-endef
-
-# Projects with compiler warnings are compiled without -Werror.
-ANDROID_WARNING_ALLOWED_PROJECTS := \
-    bootable/% \
-    cts/% \
-    dalvik/% \
-    development/% \
-    device/% \
-    external/% \
-    frameworks/% \
-    hardware/% \
-    packages/% \
-    system/% \
-    test/vts/% \
-    tools/adt/idea/android/ultimate/get_modification_time/jni/% \
-    vendor/% \
-
+# ANDROID_WARNING_ALLOWED_PROJECTS is generated by build/soong.
 define find_warning_allowed_projects
     $(filter $(ANDROID_WARNING_ALLOWED_PROJECTS),$(1)/)
 endef