目标输出文件的路径 [英] Path to target output file

问题描述

我有一个由 add_library 创建的.so库目标，并且需要将此库的绝对路径传递到外部脚本。现在我有 $ {LIBRARY_OUTPUT_PATH} / $ {CMAKE_SHARED_LIBRARY_PREFIX} LangShared $ {CMAKE_SHARED_LIBRARY_SUFFIX} （ LIBRARY_OUTPUT_PATH my CMakeLists.txt ）。这看起来像硬编码给我，因为它会破裂，只要目标被重命名或其某些属性更改。有没有办法获得 add_library 的输出的绝对路径？

I have a .so library target created by add_library, and need to pass an absolute path to this library to an external script. Now I have ${LIBRARY_OUTPUT_PATH}/${CMAKE_SHARED_LIBRARY_PREFIX}LangShared${CMAKE_SHARED_LIBRARY_SUFFIX} for that (LIBRARY_OUTPUT_PATH is defined in my CMakeLists.txt). This looks like hard-coding to me, because it will break as soon as the target is renamed or some of its properties are changed. Is there a way to get an absolute path to add_library's output?

推荐答案

您应该使用生成器表达式 this。

You should use a generator expression for this.

从 add_custom_command 和生成器表达式的文档：

From the docs for add_custom_command and the docs for generator expressions:

参数 COMMAND 可以使用生成器表达式...

Arguments to COMMAND may use "generator expressions"...

生成器表达式在构建系统生成期间被评估，

Generator expressions are evaluted during build system generation to produce information specific to each build configuration.

在这种情况下，假设您的库目标称为MyLib，生成器表达式表示完整路径建立的库将是：

In this case, assuming your library target is called "MyLib", the generator expression representing the full path to the built library would be:

$<TARGET_FILE:MyLib>

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