CMake-将多个库合并为一个 [英] CMake - combine multiple libraries into one
问题描述
假设我有可执行文件A，B，C，并且我具有外部库X，Y，Z
Let's say I have executables A, B, C, and I have external libraries X, Y, Z
SET(EXTERNAL_LIB X Y Z)
TARGET_LINK_LIBRARIES(A, ${EXTERNAL_LIB})
TARGET_LINK_LIBRARIES(B, ${EXTERNAL_LIB})
TARGET_LINK_LIBRARIES(C, ${EXTERNAL_LIB})
但是，如果我将其可视化(使用 cmake --graphviz 选项，则会得到一个复杂的二部图，其边缘从每个可执行文件A，B和C到每个库X，Y和Z.
However, if I visualize this (using cmake --graphviz option, I get a complex bipartite graph with edges from each of the executables A, B, and C to each of the libraries X, Y, and Z.
我想知道是否有一种方法可以将所有库组合成一个库.
I was wondering if there's a way to combine all the libraries into one.
推荐答案
所有这些都取决于您的平台，编译器和库的类型:
All of this depends a bit on your platform, compiler and the type of libraries:
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以防万一，您可以自己构建X，Y，Z:创建一个新项目
XYZ，该项目是根据X，Y和Z的汇总源文件构建的.是可能的，您可能不会在SO上询问过.
In case, you can build X, Y, Z yourself: Create a new project
XYZ, built from the aggregated source files of X, Y and Z. But I guess if this was possible, you would not have asked on SO.
如果您无法重建这些库，并且它们是作为共享库(dll/so)构建的，那么您很不走运.您可以尝试编写一个包装器库，该包装器隐藏X，Y和Z的所有内部结构，并将由应用程序A，B和C使用.
If you can not rebuild the libs and they were built as a shared libraryy (dll/so), you are out of luck. You could try to write a wrapper library, which hides all the internals of X, Y and Z and which will be used by applications A, B and C.
如果它们是作为静态库构建的，请查看此SO问题.由于静态库只不过是目标文件的存档，因此您可以从每个库中提取目标代码，并用 ar 对其进行重新组合.
If they were build as static libs, take a look at this SO question. Because a static lib is not much more than an archive of object files, you may be able to extract the object code from each lib and recombine them with ar.
但是你为什么呢?假设您获得了仅依赖X的第四个应用程序D.无论如何，您都将需要单独的库Y(除非您不想与所有库不必要地链接).
But why would you? Suppose you get a fourth application D, which only depends on X. Then you would need the separate library Y anyway (unless you prefer to unnecessarily link with all libs).
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