给定一个 Makefile（本例中不需要命令）：
program: src0.o src1.o
src0.o: src0.c src0.h
src1.o: src1.c src1.h src0.h
有谁知道可以生成点文件的工具？
如下：
digraph "Dependencies" {
"src0.h" -> "src0.o";
"src0.h" -> "src1.o";
"src1.h" -> "src1.o";
"src0.c" -> "src0.o";
"src1.c" -> "src1.o";
"src0.o" -> "program";
"src1.o" -> "program";
}
请注意，此工具也可以足够聪明地使用 .o 文件的快捷方式，并假装 c 文件依赖于它们包含的头文件。
digraph "Dependencies" {
"src0.h" -> "src0.c";
"src0.h" -> "src1.c";
"src1.h" -> "src1.c";
"src0.c" -> "program";
"src1.c" -> "program";
}