静态和动态库链接 [英] Static and dynamic library linking

问题描述

在C ++中，静态库A链接到动态库B和C.如果在B中定义的A中使用了Foo类，那么如果不使用Foo，C会链接吗?

In C++, static library A is linked into dynamic libraries B and C. If a class, Foo, is used in A which is defined in B, will C link if it doesn't use Foo?

我以为答案是肯定的，但是我现在遇到了xlc_r7的问题，其中库C表示Foo是未定义的符号，就C而言.我的问题是库C没有使用引用它的类.该链接在Win32(VC6)和OpenVMS中.

I thought the answer was yes, but I am now running into a problem with xlc_r7 where library C says Foo is an undefined symbol, which it is as far as C is concerned. My problem with that is Library C isn't using the class referencing it. This links in Win32 (VC6) and OpenVMS.

这是链接器差异还是PBCAK?

Is this a linker discrepancy or a PBCAK?

新信息:

1. B取决于C，但反之则不.

1. B depends on C, but not visa-versa.

我在Windows上没有使用/OPT:REF进行链接，因此它没有问题.

I'm not using /OPT:REF to link on Windows and it links without issue.

推荐答案

静态链接时，两个模块成为一个.因此，当您编译C并将A链接到其中时，就好像您已将A的所有源代码都复制到C的源代码中，然后编译了组合的源代码一样.因此C.dll包含A，它通过Foo对B具有依赖性.您需要将C链接到B的链接库，以满足这种依赖性.

When you statically link, two modules become one. So when you compile C and link A into it, its as if you had copied all the source code of A into the source code of C, then compiled the combined source. So C.dll includes A, which has a dependency on B via Foo. You'll need to link C to B's link library in order to satisfy that dependency.

请注意，根据您的信息，这将在B和C之间建立循环依赖关系.

Note that according to your info, this will create a circular dependency between B and C.

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