1.背景
源代码分布在不同子目录，这些子目录都会分别编译成静态库。
编译完成后，使用 ar x 把这些库还原成目标文件.
最后 ar cru 再合成一个新的库，这个库最终发布出来。
2.问题
使用 ar x 还原成目标文件的时候，某些静态库总是未完成编译
3.请问如何设置cmakelists.txt ，才能让最后调用 ar x 的地方，依赖前面编译好的库
C:\Program Files\CMake\doc\cmake\html\guide\ide-integration\index.html
C:\Program Files\CMake\doc\cmake\html\guide\importing-exporting\index.html
C:\Program Files\CMake\doc\cmake\html\guide\tutorial\index.html
C:\Program Files\CMake\doc\cmake\html\guide\user-interaction\index.html
C:\Program Files\CMake\doc\cmake\html\guide\using-dependencies\index.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-packages.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cpack.1.html
C:\Program Files\CMake\doc\cmake\html\manual\cpack-generators.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake.1.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-variables.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-toolchains.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-server.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-qt.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-properties.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-presets.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-policies.7.html
C:\Program Files\CMake\doc\cmake\html\manual\ctest.1.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-modules.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-language.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-gui.1.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-generators.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-generator-expressions.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-file-api.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-env-variables.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-developer.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-compile-features.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-commands.7.html
C:\Program Files\CMake\doc\cmake\html\manual\cmake-buildsystem.7.html
C:\Program Files\CMake\doc\cmake\html\manual\ccmake.1.html