directly use object files when linking ELF (#22025)

builddefs/common_rules.mk

@@ -12,6 +12,9 @@ vpath %.hpp $(VPATH_SRC)
 vpath %.S $(VPATH_SRC)
 VPATH :=
 
+# Helper to return the distinct elements of a list
+uniq = $(if $1,$(firstword $1) $(call uniq,$(filter-out $(firstword $1),$1)))
+
 # Convert all SRC to OBJ
 define OBJ_FROM_SRC
 $(patsubst %.c,$1/%.o,$(patsubst %.cpp,$1/%.o,$(patsubst %.cc,$1/%.o,$(patsubst %.S,$1/%.o,$(patsubst %.clib,$1/%.a,$($1_SRC))))))
@@ -264,7 +267,7 @@ BEGIN = gccversion sizebefore
 # Note the obj.txt depeendency is there to force linking if a source file is deleted
 %.elf: $(OBJ) $(MASTER_OUTPUT)/cflags.txt $(MASTER_OUTPUT)/ldflags.txt $(MASTER_OUTPUT)/obj.txt | $(BEGIN)
 	@$(SILENT) || printf "$(MSG_LINKING) $@" | $(AWK_CMD)
-	$(eval CMD=MAKE=$(MAKE) $(CC) $(ALL_CFLAGS) $(filter-out %.txt,$^) --output $@ $(LDFLAGS))
+	$(eval CMD=MAKE=$(MAKE) $(CC) $(ALL_CFLAGS) $(call uniq,$(OBJ)) --output $@ $(LDFLAGS))
 	@$(BUILD_CMD)