如何通过新生成器重用现有的CMake变量 [英] How to re-use existing CMake variables with new generator

问题描述

我需要在VS2015中为32位和64位构建OpenCV.

I need to build OpenCV for both 32-bit and 64-bit in VS2015.

我知道每个生成器都需要一个单独的构建树.

I'm aware that I need a separate build tree for each generator.

OpenCV的CMake配置大约有300个用户可配置的变量，我终于对它们感到满意.现在，我要使用完全相同的一组决定来构建64位版本.

OpenCV's CMake configuration has approximately 300 user-configurable variables, which I have finally got set to my satisfaction. Now I want to use the exact same set of decisions to build the 64-bit version.

是否可以将代表我的决策的变量值传输到新的构建树? (除了并排打开两个CMake-GUI并检查所有〜300个值都对应.)

Is there a way to transfer the variable values that represent my decisions to the new build tree? (Other than opening two CMake-GUIs side by side and checking that all ~300 values correspond.)

顺便说一句，如果更改了生成器，则必须根据CMake邮件列表[

BTW, if the generator is changed, CMakeCache.txt must be deleted, according to the CMake mailing list [ http://cmake.3232098.n2.nabble.com/Changing-the-the-current-generator-in-CMake-GUI-td7587876.html ]. Manually editing it is very risky and will likely lead to undefined behaviour.

谢谢

推荐答案

将我的评论变成答案

您可以在新目录中使用部分CMakeCache.txt(CMake只会预加载其中的值，然后重新评估其余值).

You can use a partial CMakeCache.txt in the new directory (CMake will just pre-load the values that are there and reevaluate the rest).

因此，您可以使用类似grep的方法并进行

So you can use a grep like approach and do

findstr "OpenCV_" CMakeCache.txt > \My\New\Path\CMakeCache.txt

只需对其进行测试，就可以按预期工作.

Just tested it and seems to work as expected.

参考

• 什么是Windows良好的grep工具?

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