Sort out ANDROID_GOALS, KATI_GOALS and NINJA_GOALS.

ANDROID_GOALS: any Android goals that need to be built.
KATI_GOALS: goals that we need to pass to Kati.
NINJA_GOALS: goals we need to pass to Ninja.

For modifier Android goals (dist, INTERNAL_MODIFIER_TARGETS),
we don't need to pass them to Ninja. See also commit
80e46c7c5cb7b1d80114876d301798a8624b4200.
Restore the dist rule removed by the above commit.

Previously "droid" was never passed to Ninja. That's incorrect.
"make droid docs" should build both docs and droiod.
Fixed with this change.

Change-Id: I5c28061fe0ebe7848872ee349056d029b787ff71
diff --git a/core/distdir.mk b/core/distdir.mk
index 24beddc..51ec46e 100644
--- a/core/distdir.mk
+++ b/core/distdir.mk
@@ -22,6 +22,11 @@
 
 dist_goal := $(strip $(filter dist,$(MAKECMDGOALS)))
 MAKECMDGOALS := $(strip $(filter-out dist,$(MAKECMDGOALS)))
+ifeq (,$(strip $(filter-out $(INTERNAL_MODIFIER_TARGETS),$(MAKECMDGOALS))))
+# The commandline was something like "make dist" or "make dist showcommands".
+# Add a dependency on a real target.
+dist: $(DEFAULT_GOAL)
+endif
 
 ifdef dist_goal
 
diff --git a/core/main.mk b/core/main.mk
index 7901bd8..7896d38 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -426,7 +426,7 @@
 sdk_repo_goal := $(strip $(filter sdk_repo,$(MAKECMDGOALS)))
 MAKECMDGOALS := $(strip $(filter-out sdk_repo,$(MAKECMDGOALS)))
 
-ifneq ($(words $(filter-out $(INTERNAL_MODIFIER_TARGETS) checkbuild emulator_tests target-files-package,$(MAKECMDGOALS))),1)
+ifneq ($(words $(sort $(filter-out $(INTERNAL_MODIFIER_TARGETS) checkbuild emulator_tests target-files-package,$(MAKECMDGOALS)))),1)
 $(error The 'sdk' target may not be specified with any other targets)
 endif
 
diff --git a/core/ninja.mk b/core/ninja.mk
index 7a3166a..2e8f3c8 100644
--- a/core/ninja.mk
+++ b/core/ninja.mk
@@ -2,11 +2,16 @@
 MAKEPARALLEL ?= $(HOST_OUT_EXECUTABLES)/makeparallel
 
 KATI_OUTPUT_PATTERNS := $(OUT_DIR)/build%.ninja $(OUT_DIR)/ninja%.sh
-NINJA_GOALS := droid showcommands
-# A list of goals which affect parsing of make.
+
+# Modifier goals we don't need to pass to Ninja.
+NINJA_EXCLUDE_GOALS := showcommands all dist
+.PHONY : $(NINJA_EXCLUDE_GOALS)
+
+# A list of goals which affect parsing of makefiles and we need to pass to Kati.
 PARSE_TIME_MAKE_GOALS := \
 	$(PARSE_TIME_MAKE_GOALS) \
 	$(dont_bother_goals) \
+	all \
 	APP-% \
 	DUMP_% \
 	ECLIPSE-% \
@@ -52,17 +57,21 @@
 
 -include vendor/google/build/ninja_config.mk
 
-ANDROID_TARGETS := $(filter-out $(KATI_OUTPUT_PATTERNS) $(NINJA_GOALS),$(ORIGINAL_MAKECMDGOALS))
-EXTRA_TARGETS := $(filter-out $(KATI_OUTPUT_PATTERNS) $(NINJA_GOALS),$(filter-out $(ORIGINAL_MAKECMDGOALS),$(MAKECMDGOALS)))
-KATI_TARGETS := $(filter $(PARSE_TIME_MAKE_GOALS),$(ANDROID_TARGETS))
+# Any Android goals that need to be built.
+ANDROID_GOALS := $(filter-out $(KATI_OUTPUT_PATTERNS) $(KATI) $(MAKEPARALLEL),\
+    $(sort $(ORIGINAL_MAKECMDGOALS) $(MAKECMDGOALS)))
+# Goals we need to pass to Ninja.
+NINJA_GOALS := $(filter-out $(NINJA_EXCLUDE_GOALS), $(ANDROID_GOALS))
+# Goals we need to pass to Kati.
+KATI_GOALS := $(filter $(PARSE_TIME_MAKE_GOALS),  $(ANDROID_GOALS))
 
 define replace_space_and_slash
 $(subst /,_,$(subst $(space),_,$(sort $1)))
 endef
 
 KATI_NINJA_SUFFIX := -$(TARGET_PRODUCT)
-ifneq ($(KATI_TARGETS),)
-KATI_NINJA_SUFFIX := $(KATI_NINJA_SUFFIX)-$(call replace_space_and_slash,$(KATI_TARGETS))
+ifneq ($(KATI_GOALS),)
+KATI_NINJA_SUFFIX := $(KATI_NINJA_SUFFIX)-$(call replace_space_and_slash,$(KATI_GOALS))
 endif
 ifneq ($(ONE_SHOT_MAKEFILE),)
 KATI_NINJA_SUFFIX := $(KATI_NINJA_SUFFIX)-mmm-$(call replace_space_and_slash,$(ONE_SHOT_MAKEFILE))
@@ -72,14 +81,12 @@
 endif
 
 my_checksum_suffix :=
-ifneq ($(KATI_NINJA_SUFFIX),)
 my_ninja_suffix_too_long := $(filter 1, $(shell v='$(KATI_NINJA_SUFFIX)' && echo $$(($${$(pound)v} > 64))))
 ifneq ($(my_ninja_suffix_too_long),)
 # Replace the suffix with a checksum if it gets too long.
 my_checksum_suffix := $(KATI_NINJA_SUFFIX)
 KATI_NINJA_SUFFIX := -$(word 1, $(shell echo $(my_checksum_suffix) | $(MD5SUM)))
 endif
-endif
 
 KATI_BUILD_NINJA := $(OUT_DIR)/build$(KATI_NINJA_SUFFIX).ninja
 KATI_NINJA_SH := $(OUT_DIR)/ninja$(KATI_NINJA_SUFFIX).sh
@@ -97,8 +104,6 @@
 
 ifneq (,$(filter showcommands,$(ORIGINAL_MAKECMDGOALS)))
 NINJA_ARGS += "-v"
-PHONY: showcommands
-showcommands: droid
 endif
 
 ifdef USE_GOMA
@@ -112,13 +117,13 @@
 NINJA_MAKEPARALLEL := $(MAKEPARALLEL) --ninja
 endif
 
-droid $(ANDROID_TARGETS) $(EXTRA_TARGETS): ninja_wrapper
+$(sort $(DEFAULT_GOAL) $(ANDROID_GOALS)) : ninja_wrapper
 	@#empty
 
 .PHONY: ninja_wrapper
 ninja_wrapper: $(KATI_BUILD_NINJA) $(MAKEPARALLEL)
 	@echo Starting build with ninja
-	+$(hide) PATH=prebuilts/ninja/$(HOST_PREBUILT_TAG)/:$$PATH NINJA_STATUS="$(NINJA_STATUS)" $(NINJA_MAKEPARALLEL) $(KATI_NINJA_SH) $(filter-out dist,$(ANDROID_TARGETS)) -C $(TOP) $(NINJA_ARGS)
+	+$(hide) PATH=prebuilts/ninja/$(HOST_PREBUILT_TAG)/:$$PATH NINJA_STATUS="$(NINJA_STATUS)" $(NINJA_MAKEPARALLEL) $(KATI_NINJA_SH) $(NINJA_GOALS) -C $(TOP) $(NINJA_ARGS)
 
 KATI_FIND_EMULATOR := --use_find_emulator
 ifeq ($(KATI_EMULATE_FIND),false)
@@ -126,7 +131,7 @@
 endif
 $(KATI_BUILD_NINJA): $(KATI) $(MAKEPARALLEL) FORCE
 	@echo Running kati to generate build$(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 $(KATI_TARGETS) --gen_all_targets BUILDING_WITH_NINJA=true
+	+$(hide) $(KATI_MAKEPARALLEL) $(KATI) --ninja --ninja_dir=$(OUT_DIR) --ninja_suffix=$(KATI_NINJA_SUFFIX) --regen --ignore_dirty=$(OUT_DIR)/% --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
 
 KATI_CXX := $(CLANG_CXX) $(CLANG_HOST_GLOBAL_CFLAGS) $(CLANG_HOST_GLOBAL_CPPFLAGS)
 KATI_LD := $(CLANG_CXX) $(CLANG_HOST_GLOBAL_LDFLAGS)