CMake与其他静态库一起构建静态库 [英] CMake building a static library with other static library

问题描述

我的问题如下:

我有 OpenSSL 作为静态库(libcrypto.a和libssl.a). 在Windows上使用 MSys2/MinGW64 进行编译. 除此之外，我还有一个基于OpenSSL的小型自行编写的库.

I have OpenSSL as static libraries (libcrypto.a and libssl.a). Compiled on Windows with MSys2/MinGW64. Besides that, I have a small self written library based on OpenSSL.

现在，我想将Crypto lib从具有我的lib的OpenSSL捆绑到一个大"静态库，以便以后在Windows上的其他应用程序中进行静态编译而无需部署任何库.

Now I want to "bundle" the Crypto lib from OpenSSL with My lib to a "big" static library for later statically compiling in other applications on Windows without deploying any library.

CMakeLists.txt文件的外观如何?前提条件(OpenSSL和static libs)正确吗?

What would a CMakeLists.txt file looks like? And are the prerequisites (OpenSSL as static libs) correct?

实际上将其编译为动态的DLL就像一个吊饰.但是我的静态库仅包含我自己的库的符号，也没有来自OpenSSL的符号.

Actually compiling this to a dynamic DLL works like a charm. But My static lib are only includes the symbols of My own library, not from OpenSSL too.

实际上我没有可用的CMake文件，因此无法提供示例.我只是在寻找如何做的方向.

Actually I have no working CMake file, so I can't include an example. I'm just looking for a direction how to do it.

对于如何开始的简短建议，我们将不胜感激.

A short suggestion how to begin would be highly appreciated.

推荐答案

如果您真正想做的是将多个静态库组合到一个中，为了方便外部使用者，您可能需要运行一个自定义命令来执行此操作(因为这不是经常执行的操作).

If what you really want to do is combine multiple static libraries into one, for the convenience of external consumers, you'll probably need to run a custom command to do this (as it's not something that's frequently done).

使用GNU工具链，执行此操作的命令可能看起来像这样(虽然未经测试):

Using the GNU toolchain, the commands to do so might look something like this (untested though):

${CMAKE_COMMAND} -E make_directory tempdir
cd tempdir
${CMAKE_AR} x $<yourlib:TARGET_FILE>
${CMAKE_AR} x ${OPENSSL_CRYPTO_LIBRARY}
${CMAKE_AR} x ${OPENSSL_SSL_LIBRARY}
${CMAKE_AR} cf ${CMAKE_BINARY_DIR}/bin/libyourmegalib.a *.o
cd ..
${CMAKE_COMMAND} -E remove_directory tempdir

然后，您将使用add_custom_command()创建目标以运行此脚本-将这些行作为COMMAND自变量，或创建脚本模板，使用configure_file()在CMake生成时替换值，然后进行自定义命令运行该脚本.

Then you would use add_custom_command() to create a target to run this script - either put those lines as COMMAND arguments, or create a script template, substitute values at CMake generation time using configure_file(), then have the custom command run that script.

也就是说，如果外部使用者自己都在使用CMake，我将完全跳过此过程，而只是让您的库的安装过程生成CMake软件包配置文件，以声明对OpenSSL库的依赖关系.

That said, if the external consumers are all using CMake themselves, I would skip this entirely, and just have the installation process for your library generate CMake package configuration files that declare the dependencies on the OpenSSL libraries.

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