cmake:检查文件是否在构建时而不是在cmake配置期间存在 [英] cmake: check if file exists at build time rather than during cmake configuration

问题描述

我有一个自定义生成命令，需要检查某个文件是否存在.我尝试使用

I have a custom build command that needs to check if a certain file exists. I tried using

IF(EXISTS "/the/file")
...
ELSE()
...
ENDIF()

但是该测试仅被评估一次；第一次运行cmake时.每次制作完成后，我都需要它来执行测试.接通时间检查的方法是什么?谢谢.

but that test is only evaluated one; when cmake is first run. I need it to perform the test every time a make is done. What's the method to check at make-time? Thanks.

推荐答案

您可以使用 add_custom_command 使用 -P 命令行选项.

You can use add_custom_command to invoke CMake itself in script mode by using the -P command line option.

所以您的命令将类似于:

So your command would be something like:

set(FileToCheck "/the/file")
add_custom_command(TARGET MyExe
                   POST_BUILD
                   COMMAND ${CMAKE_COMMAND}
                       -DFileToCheck=${FileToCheck}
                       -P ${CMAKE_CURRENT_SOURCE_DIR}/check.cmake
                   COMMENT "Checking if ${FileToCheck} exists...")

和您的脚本文件"check.cmake"类似于:

and your script file "check.cmake" would be something like:

if(EXISTS ${FileToCheck})
  message("${FileToCheck} exists.")
else()
  message("${FileToCheck} doesn't exist.")
endif()

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