make: print-FOO race condition global env var fix

avoid race conditions for global variables and temp files

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

Author: oharboe

flow/scripts/variables.mk

@@ -217,16 +217,5 @@ vars:
 
 .PHONY: print-%
 print-%:
-  # HERE BE DRAGONS!
-  #
-  # We have to use /tmp. $(OBJECTS_DIR) may not exist
-  # at $(file) expansion time, which is before commands are run
-  # here, so we can't mkdir -p $(OBJECTS_DIR) either
-  #
-  # We have to use $(file ...) because we want to be able
-  # to print variables that contain newlines.
-	$(eval TEMP_FILE := $(shell mktemp /tmp/print_tmp.XXXXXX))
-	@$(file >$(TEMP_FILE),$($*))
-	@echo -n "$*: "
-	@cat $(TEMP_FILE)
-	@rm -f $(TEMP_FILE)
+	$(info $*: $($*))
+	@true