cpack和安装（CODE ...）-CPACK_PACKAGING_INSTALL_PREFIX与CMAKE_INSTALL_PREFIX [英] cpack and install(CODE ...) - CPACK_PACKAGING_INSTALL_PREFIX vs CMAKE_INSTALL_PREFIX

问题描述

作为安装后挂钩，我需要执行一个安装命令，例如

  install（CODE execute_process（COMMAND some_command $ {CMAKE_INSTALL_PREFIX} / some_folder））
  

会在中创建文件some_folder 基于先前安装到 some_folder 的文件（它会编译这些文件的索引/缓存）。

这对于安装目标来说效果很好，但是，一旦使用cpack $ {CMAKE_INSTALL_PREFIX} 不再是正确的位置。

是否有像$ {CMAKE_CURRENT_INSTALL_PREFIX}这样的变量始终指向当前安装目录，而不管是否使用了默认安装目标或cpack且可用于此目的？ p>

我看到的唯一替代方法是尝试在较早的阶段对原始文件执行命令，创建一个临时文件并安装该临时文件。不幸的是，这更容易出错，因为 some_command 应该在安装后在最终文件上运行（以创建有效的缓存）

解决方案

答案非常简单（IRC的Nils Gladitz表示敬意）：

用反斜杠转义变量 $ {CMAKE_INSTALL_PREFIX} 会延迟其扩展，直到安装时它也保持正确的值（也适用于通过CPack进行安装）：

 安装（代码 execute_process（命令some_command \ $ {CMAKE_INSTALL_PREFIX} / some_folder））
  

as a "post-install hook" I need to execute an install command like

install(CODE "execute_process(COMMAND some_command ${CMAKE_INSTALL_PREFIX}/some_folder"))

which creates a file in some_folder based on the files which were previously installed into some_folder (it compiles an index/cache of those files).

This works fine for the install target, however as soon as using cpack ${CMAKE_INSTALL_PREFIX} is not the correct location anymore.

Is there a variable like ${CMAKE_CURRENT_INSTALL_PREFIX} that always points towards the current installation directory, regardless of wether the default install target or cpack is used and can be used for this purpose?

The only alternative I see is to try to execute the command at an earlier stage on the original files, create a temporary file and install the temporary file. Unfortunately this is much more error prone, as some_command should be run on the "final" files after installation (in order to create a valid cache)

解决方案

The answer turns out to be extremely simple (kudos to Nils Gladitz from IRC):

Escaping the variable ${CMAKE_INSTALL_PREFIX} with a backslash delays its expansion until install time at which it holds the correct value also for installs via CPack:

install(CODE "execute_process(COMMAND some_command \${CMAKE_INSTALL_PREFIX}/some_folder"))

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