unit-test-app: don’t include project.mk for ut- targets

If project.mk is included twice in recursive invocation of Make, some
variables defined on the first pass will not be redefined on the
second pass. Rather than cleaning up these variables before calling
Make recursively, don’t include IDF project.mk at all, if one of the
ut- targets is requested.

tools/unit-test-app/Makefile

@@ -5,9 +5,10 @@
 
 PROJECT_NAME := unit-test-app
 
-include $(IDF_PATH)/make/project.mk
-
 ifeq ($(MAKELEVEL),0)
+# Set default target
+all:
+
 # Define helper targets only when not recursing
 
 # List of unit-test-app configurations.
@@ -22,8 +23,9 @@ CONFIG_CLEAN_TARGETS := $(addprefix ut-clean-,$(CONFIG_NAMES))
 CONFIG_APPLY_TARGETS := $(addprefix ut-apply-config-,$(CONFIG_NAMES))
 
 # Build (intermediate) and output (artifact) directories
-BUILDS_DIR := $(PROJECT_PATH)/builds
-BINARIES_DIR := $(PROJECT_PATH)/output
+PROJECT_DIR := $(abspath $(dir $(firstword $(MAKEFILE_LIST))))
+BUILDS_DIR := $(PROJECT_DIR)/builds
+BINARIES_DIR := $(PROJECT_DIR)/output
 
 # This generates per-config targets (clean, build, apply-config).
 define GenerateConfigTargets
@@ -57,14 +59,14 @@ $(BINARIES_DIR)/%/$(PROJECT_NAME).bin: configs/%
 	mkdir -p $(BINARIES_DIR)/$*/bootloader
 	mkdir -p $(BUILDS_DIR)/$*
 	# Prepare configuration: top-level sdkconfig.defaults file plus the current configuration (configs/$*)
-	$(summary) CONFIG $(BUILDS_DIR)/$*/sdkconfig
+	echo CONFIG $(BUILDS_DIR)/$*/sdkconfig
 	rm -f $(BUILDS_DIR)/$*/sdkconfig
 	cat sdkconfig.defaults > $(BUILDS_DIR)/$*/sdkconfig.defaults
 	echo "" >> $(BUILDS_DIR)/$*/sdkconfig.defaults # in case there is no trailing newline in sdkconfig.defaults
 	cat configs/$* >> $(BUILDS_DIR)/$*/sdkconfig.defaults
 
 	# Build, tweaking paths to sdkconfig and sdkconfig.defaults
-	$(summary) BUILD_CONFIG $(BUILDS_DIR)/$*
+	echo BUILD_CONFIG $(BUILDS_DIR)/$*
 	# 'TEST_COMPONENTS=names' option can be added to configs/$* to limit the set
 	# of tests to build for given configuration.
 	# Build all tests if this option is not present.
@@ -78,7 +80,7 @@ $(BINARIES_DIR)/%/$(PROJECT_NAME).bin: configs/%
 		TEST_COMPONENTS="$${test_components}" \
 		TESTS_ALL=$${tests_all} \
 		EXCLUDE_COMPONENTS="$${exclude_components}"
-	$(MAKE) print_flash_cmd \
+	$(MAKE) --silent print_flash_cmd \
 		BUILD_DIR_BASE=$(BUILDS_DIR)/$* \
 		SDKCONFIG=$(BUILDS_DIR)/$*/sdkconfig \
 		| sed -e 's:'$(BUILDS_DIR)/$*/'::g' \
@@ -113,17 +115,29 @@ ut-help:
 
 help: ut-help
 
-.PHONY: ut-build-all-configs ut-clean-all-configs \
-		$(CONFIG_BUILD_TARGETS) $(CONFIG_CLEAN_TARGETS) $(CONFIG_APPLY_TARGETS) \
+LOCAL_TARGETS := ut-build-all-configs ut-clean-all-configs \
+		$(CONFIG_BUILD_TARGETS) $(CONFIG_CLEAN_TARGETS) \
 		ut-help
 
+.PHONY: $(LOCAL_TARGETS)
+
 NON_INTERACTIVE_TARGET += ut-apply-config-% ut-clean-% ut-build-% \
 						  ut-build-all-configs ut-clean-all-configs
 
-else # MAKELEVEL == 0
+endif # MAKELEVEL == 0
+
+
+# When targets defined in this makefile are built, don't need to include the main project makefile.
+# This prevents some variables which depend on build directory from being set erroneously.
+ifeq ($(filter $(LOCAL_TARGETS),$(MAKECMDGOALS)),)
+
+include $(IDF_PATH)/make/project.mk
+
+endif
 
 # If recursing, print the actual list of tests being built
+ifneq ($(MAKELEVEL),0)
 
 $(info TESTS $(foreach comp,$(TEST_COMPONENT_NAMES),$(patsubst %_test,%,$(comp))))
 
-endif # MAKELEVEL == 0
+endif # MAKELEVEL != 0