diff --git a/Changes.md b/Changes.md
index 70e338c..2720a0f 100644
--- a/Changes.md
+++ b/Changes.md
@@ -1,5 +1,14 @@
 # Build System Changes for Android.mk Writers
 
+## COPY_HEADERS usage now produces warnings {#copy_headers}
+
+We've considered `BUILD_COPY_HEADERS`/`LOCAL_COPY_HEADERS` to be deprecated for
+a long time, and the places where it's been able to be used have shrinked over
+the last several releases. Equivalent functionality is not available in Soong.
+
+See the [build/soong/docs/best_practices.md#headers] for more information about
+how best to handle headers in Android.
+
 ## `m4` is not available on `$PATH`
 
 There is a prebuilt of it available in prebuilts/build-tools, and a make
@@ -553,6 +562,7 @@
 
 
 [build/soong/Changes.md]: https://android.googlesource.com/platform/build/soong/+/master/Changes.md
+[build/soong/docs/best_practices.md#headers]: https://android.googlesource.com/platform/build/soong/+/master/docs/best_practices.md#headers
 [external/fonttools/Lib/fontTools/Android.bp]: https://android.googlesource.com/platform/external/fonttools/+/master/Lib/fontTools/Android.bp
 [frameworks/base/Android.bp]: https://android.googlesource.com/platform/frameworks/base/+/master/Android.bp
 [frameworks/base/data/fonts/Android.mk]: https://android.googlesource.com/platform/frameworks/base/+/master/data/fonts/Android.mk
diff --git a/Deprecation.md b/Deprecation.md
index 9e9b22c..7046a74 100644
--- a/Deprecation.md
+++ b/Deprecation.md
@@ -16,6 +16,7 @@
 | -------------------------------- | --------- |
 | `BUILD_AUX_EXECUTABLE`           | Error     |
 | `BUILD_AUX_STATIC_LIBRARY`       | Error     |
+| `BUILD_COPY_HEADERS`             | Warning   |
 | `BUILD_HOST_FUZZ_TEST`           | Error     |
 | `BUILD_HOST_NATIVE_TEST`         | Error     |
 | `BUILD_HOST_SHARED_LIBRARY`      | Warning   |
diff --git a/core/board_config.mk b/core/board_config.mk
index f5c8ea5..63d7e07 100644
--- a/core/board_config.mk
+++ b/core/board_config.mk
@@ -621,11 +621,15 @@
 ###########################################
 # Handle BUILD_BROKEN_USES_BUILD_*
 
-$(foreach m,$(DEFAULT_WARNING_BUILD_MODULE_TYPES),\
+$(foreach m,$(filter-out BUILD_COPY_HEADERS,$(DEFAULT_WARNING_BUILD_MODULE_TYPES)),\
   $(if $(filter false,$(BUILD_BROKEN_USES_$(m))),\
     $(KATI_obsolete_var $(m),Please convert to Soong),\
     $(KATI_deprecated_var $(m),Please convert to Soong)))
 
+$(if $(filter false,$(BUILD_BROKEN_USES_BUILD_COPY_HEADERS)),\
+  $(KATI_obsolete_var BUILD_COPY_HEADERS,See $(CHANGES_URL)#copy_headers),\
+  $(KATI_deprecated_var BUILD_COPY_HEADERS,See $(CHANGES_URL)#copy_headers))
+
 $(foreach m,$(DEFAULT_ERROR_BUILD_MODULE_TYPES),\
   $(if $(filter true,$(BUILD_BROKEN_USES_$(m))),\
     $(KATI_deprecated_var $(m),Please convert to Soong),\
diff --git a/core/definitions.mk b/core/definitions.mk
index 3a23289..fd785b8 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -2200,7 +2200,7 @@
 @mkdir -p $(dir $@)
 $(hide) rm -f $(dir $@)classes*.dex $(dir $@)d8_input.jar
 $(hide) $(ZIP2ZIP) -j -i $< -o $(dir $@)d8_input.jar "**/*.class"
-$(hide) $(DX_COMMAND) $(DEX_FLAGS) \
+$(hide) $(D8_WRAPPER) $(DX_COMMAND) $(DEX_FLAGS) \
     --output $(dir $@) \
     $(addprefix --lib ,$(PRIVATE_D8_LIBS)) \
     --min-api $(PRIVATE_MIN_SDK_VERSION) \
@@ -2679,7 +2679,7 @@
 define transform-jar-to-dex-r8
 @echo R8: $@
 $(hide) rm -f $(PRIVATE_PROGUARD_DICTIONARY)
-$(hide) $(R8_COMPAT_PROGUARD) $(DEX_FLAGS) \
+$(hide) $(R8_WRAPPER) $(R8_COMPAT_PROGUARD) $(DEX_FLAGS) \
     -injars '$<' \
     --min-api $(PRIVATE_MIN_SDK_VERSION) \
     --no-data-resources \
diff --git a/core/deprecation.mk b/core/deprecation.mk
index fd71f48..dac7e4b 100644
--- a/core/deprecation.mk
+++ b/core/deprecation.mk
@@ -1,6 +1,5 @@
 # These module types can still be used without warnings or errors.
 AVAILABLE_BUILD_MODULE_TYPES :=$= \
-  BUILD_COPY_HEADERS \
   BUILD_EXECUTABLE \
   BUILD_FUZZ_TEST \
   BUILD_HEADER_LIBRARY \
@@ -26,6 +25,7 @@
 # relevant BUILD_BROKEN_USES_BUILD_* variables, then these would move to
 # DEFAULT_ERROR_BUILD_MODULE_TYPES.
 DEFAULT_WARNING_BUILD_MODULE_TYPES :=$= \
+  BUILD_COPY_HEADERS \
   BUILD_HOST_SHARED_LIBRARY \
   BUILD_HOST_STATIC_LIBRARY \
 
diff --git a/core/host_shared_library.mk b/core/host_shared_library.mk
index 81236d1..c22af97 100644
--- a/core/host_shared_library.mk
+++ b/core/host_shared_library.mk
@@ -37,4 +37,7 @@
 ###########################################################
 ## Copy headers to the install tree
 ###########################################################
-include $(BUILD_COPY_HEADERS)
+ifdef LOCAL_COPY_HEADERS
+$(call pretty-warning,LOCAL_COPY_HEADERS is deprecated. See $(CHANGES_URL)#copy_headers)
+include $(BUILD_SYSTEM)/copy_headers.mk
+endif
diff --git a/core/host_static_library.mk b/core/host_static_library.mk
index 469da29..3dbd144 100644
--- a/core/host_static_library.mk
+++ b/core/host_static_library.mk
@@ -37,4 +37,7 @@
 ###########################################################
 ## Copy headers to the install tree
 ###########################################################
-include $(BUILD_COPY_HEADERS)
+ifdef LOCAL_COPY_HEADERS
+$(call pretty-warning,LOCAL_COPY_HEADERS is deprecated. See $(CHANGES_URL)#copy_headers)
+include $(BUILD_SYSTEM)/copy_headers.mk
+endif
diff --git a/core/main.mk b/core/main.mk
index 99e4e43..cb44106 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -1341,7 +1341,7 @@
 endif
 
 # Build docs as part of checkbuild to catch more breakages.
-module_to_check += $(ALL_DOCS)
+modules_to_check += $(ALL_DOCS)
 
 # for easier debugging
 modules_to_check := $(sort $(modules_to_check))
diff --git a/core/rbe.mk b/core/rbe.mk
index 231859b..6a92366 100644
--- a/core/rbe.mk
+++ b/core/rbe.mk
@@ -21,12 +21,25 @@
   else
     rbe_dir := $(HOME)/rbe
   endif
-  RBE_WRAPPER := $(rbe_dir)/rewrapper --labels=type=compile,lang=cpp,compiler=clang --env_var_whitelist=PWD
+  RBE_WRAPPER := $(rbe_dir)/rewrapper
+  RBE_CXX := --labels=type=compile,lang=cpp,compiler=clang --env_var_whitelist=PWD
 
   # Append rewrapper to existing *_WRAPPER variables so it's possible to
   # use both ccache and rewrapper.
-  CC_WRAPPER := $(strip $(CC_WRAPPER) $(RBE_WRAPPER))
-  CXX_WRAPPER := $(strip $(CXX_WRAPPER) $(RBE_WRAPPER))
+  CC_WRAPPER := $(strip $(CC_WRAPPER) $(RBE_WRAPPER) $(RBE_CXX))
+  CXX_WRAPPER := $(strip $(CXX_WRAPPER) $(RBE_WRAPPER) $(RBE_CXX))
+
+  ifdef RBE_JAVAC
+    JAVAC_WRAPPER := $(strip $(JAVAC_WRAPPER) $(RBE_WRAPPER) --labels=type=compile,lang=java,compiler=javac,shallow=true)
+  endif
+
+  ifdef RBE_R8
+    R8_WRAPPER := $(strip $(RBE_WRAPPER) --labels=type=compile,compiler=r8,shallow=true)
+  endif
+
+  ifdef RBE_D8
+    D8_WRAPPER := $(strip $(RBE_WRAPPER) --labels=type=compile,compiler=d8,shallow=true)
+  endif
 
   rbe_dir :=
 endif
diff --git a/core/shared_library.mk b/core/shared_library.mk
index 984f05f..ca17151 100644
--- a/core/shared_library.mk
+++ b/core/shared_library.mk
@@ -56,4 +56,7 @@
 ###########################################################
 ## Copy headers to the install tree
 ###########################################################
-include $(BUILD_COPY_HEADERS)
+ifdef LOCAL_COPY_HEADERS
+$(call pretty-warning,LOCAL_COPY_HEADERS is deprecated. See $(CHANGES_URL)#copy_headers)
+include $(BUILD_SYSTEM)/copy_headers.mk
+endif
diff --git a/core/soong_config.mk b/core/soong_config.mk
index d223792..95ff5ef 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -156,6 +156,9 @@
 
 $(call add_json_bool, UseGoma,                           $(filter-out false,$(USE_GOMA)))
 $(call add_json_bool, UseRBE,                            $(filter-out false,$(USE_RBE)))
+$(call add_json_bool, UseRBEJAVAC,                       $(filter-out false,$(RBE_JAVAC)))
+$(call add_json_bool, UseRBER8,                          $(filter-out false,$(RBE_R8)))
+$(call add_json_bool, UseRBED8,                          $(filter-out false,$(RBE_D8)))
 $(call add_json_bool, Arc,                               $(filter true,$(TARGET_ARC)))
 
 $(call add_json_list, NamespacesToExport,                $(PRODUCT_SOONG_NAMESPACES))
diff --git a/core/static_library.mk b/core/static_library.mk
index 1b056ec..78908cf 100644
--- a/core/static_library.mk
+++ b/core/static_library.mk
@@ -41,4 +41,7 @@
 ###########################################################
 ## Copy headers to the install tree
 ###########################################################
-include $(BUILD_COPY_HEADERS)
+ifdef LOCAL_COPY_HEADERS
+$(call pretty-warning,LOCAL_COPY_HEADERS is deprecated. See $(CHANGES_URL)#copy_headers)
+include $(BUILD_SYSTEM)/copy_headers.mk
+endif