workaround: Rename tool output temporarily on build

tools/Rules.make

@@ -44,6 +44,8 @@ TOOLS_CXX_COMPILE = $(TOOLS_CC) $(TOOLS_CXXFLAGS) $(TOOLS_INCS)
 # Command for ensuring the output directory for the rule exists.
 DIR_GUARD = @$(MKDIR) -p $(@D)
 
+MAKE_CURPID := $(shell printf '%s' $$PPID)
+
 $(TOOLS_OBJS_DIR)%.o : $(TOOLS_SRC_DIR)%.c
 	$(DIR_GUARD)
 	$(CC) $(TOOLS_CFLAGS) $(TOOLS_INCS) -c $< -o $@
@@ -60,10 +62,20 @@ $(TOOLS_OBJS_DIR)%.o : $(TOOLS_SRC_DIR)%.s
 	$(DIR_GUARD)
 	$(AS) $(TOOLS_ASFLAGS) $< -o $@
 
-$(TOOLS_BIN) : $(TOOLS_OBJS) $(TOOLS_LIB_ARCHIVES) $(TOOLS_ADDITIONAL_DEPS)
+.INTERMEDIATE:: $(TOOLS_BIN)_tmp$(MAKE_CURPID) $(TOOLS_LIB)_tmp$(MAKE_CURPID)
+
+$(TOOLS_BIN)_tmp$(MAKE_CURPID) : $(TOOLS_OBJS) $(TOOLS_LIB_ARCHIVES) $(TOOLS_ADDITIONAL_DEPS)
+	$(DIR_GUARD)
+	$(CC) $(TOOLS_LDFLAGS) -o $@ $(TOOLS_OBJS) $(TOOLS_LIB_ARCHIVES) $(TOOLS_LIBS)
+
+$(TOOLS_BIN): $(TOOLS_BIN)_tmp$(MAKE_CURPID)
+	$(DIR_GUARD)
+	mv $< $@
+
+$(TOOLS_LIB)_tmp$(MAKE_CURPID) : $(TOOLS_OBJS)
 	$(DIR_GUARD)
-	$(CC) $(TOOLS_LDFLAGS) -o $(TOOLS_BIN) $(TOOLS_OBJS) $(TOOLS_LIB_ARCHIVES) $(TOOLS_LIBS)
+	$(AR) cru $@ $<
 
-$(TOOLS_LIB) : $(TOOLS_OBJS)
+$(TOOLS_LIB): $(TOOLS_LIB)_tmp$(MAKE_CURPID)
 	$(DIR_GUARD)
-	$(AR) cru $(TOOLS_LIB) $<
+	mv $< $@