make: print-FOO fixes

Signed-off-by: Øyvind Harboe <[email protected]>

Author: oharboe

flow/scripts/variables.mk

@@ -215,7 +215,15 @@ vars:
 .PHONY: print-%
 # Print any variable, for instance: make print-DIE_AREA
 print-%:
-	$(file >$(OBJECTS_DIR)/print_tmp_$$,$($*))
+  # HERE BE DRAGONS!
+  #
+  # We have to use /tmp. $(OBJECTS_DIR) may not exist
+  # at $(file) expansion time, which is before commands are run
+  # here, so we can't mkdir -p $(OBJECTS_DIR) either
+  #
+  # We have to use $(file ...) because we want to be able
+  # to print variables that contain newlines.
+	$(file >/tmp/print_tmp$$,$($*))
 	@echo -n "$* = "
-	@cat $(OBJECTS_DIR)/print_tmp_$$
-	@rm $(OBJECTS_DIR)/print_tmp_$$
+	@cat /tmp/print_tmp$$
+	@rm /tmp/print_tmp$$