Question

在我们的系统中，我们将一个特定的子系统文件创建为.o文件，比如sub.o。 sub.o依赖于组件compA.o，compB.o和compC.o，并且每个组件都有一些依赖关系。制作完整系统后，目录中会存在compA.o，compB.o，compC.o和sub.o。如果我要删除compA.o并尝试重新制作系统，它会说没有任何事情要做，compA.o仍然不存在。这是因为compA.o被视为中间文件。我知道源文件永远不会改变，最终结果很好。

我不明白为什么文件compA.o仅在重制系统时被认为是中间的。如果在初始构建中被认为是中间的，那么在构建之后它不存在，给定this definition个中间文件？

我应该提一下，这只是在我们从make-3.79转到make-3.81后才存在。

make -d sub.o的相关输出：

Looking for an implicit rule for 'compA.o'.
Trying pattern rule with stem 'compA'.
Found an implicit rule for 'compA.o'.
    Looking for an implicit rule for '../pas/compA.c'.
    Trying pattern rule with stem 'compA'.
    Trying implicit prerequisite '../pas/compA.w'.
    Trying pattern rule with stem 'compA.c'.
    Trying implicit prerequisite '../pas/RCS/compA.c'.
    Trying pattern rule with stem 'compA'.
    Trying implicit prerequisite '../pas/compA.w'.
    Looking for a rule with intermediate file '../pas/compA.w'.
       Avoiding implicit rule recursion.
       Trying pattern rule with stem 'compA.w'.
       Trying implicit prerequisite '../pas/RCS/compA.w'.
    No implicit rule found for '../pas/compA.c'.

以后......

Prerequisite 'compA.o' of target 'sub.o' does not exist.
No need to remake target 'sub.o'.
make-3.81: 'sub.o' is up to date.

澄清make-3.81中的中间文件

0 个答案: