当从命令行调用它时，将包括目录添加到cmake [英] Adding include directories to cmake when calling it from command line

问题描述

我在一个情况下，我不应该打扰现有的CMakeLists.txt，但仍然应该添加一些g ++系统包含目录到我的构建。换句话说，我需要 -isystem / path / to / my / include 添加到我的编译器标志，但是当调用像 cmake .. 。也许像 cmake .. -DCMAKE_CXX_FLAGS =$ CMAKE_CXX_FLAGS -isystem / path / to / my / include？有什么办法吗？

I'm in a situation where I should not disturb the existing CMakeLists.txt but still should add some g++ system include directory to my build. In other words, I need -isystem /path/to/my/include added to my compiler flags but when calling something like cmake ... Maybe something like cmake .. -DCMAKE_CXX_FLAGS="$CMAKE_CXX_FLAGS -isystem /path/to/my/include"? Is there any way to do this?

推荐答案

我有同样的问题。我发现了两个解决方案：

I have the same problem. I found 2 solutions:

1. sakra在上一个回答中提出的解决方案， e。用C ++标志设置环境变量：

1. the one proposed by sakra in previous answer, i. e. setting environment variable with C++ flags:

export CXXFLAGS=-isystem\ /path/to/my/include
cmake <path to my sources>

或同样的东西，但是环境变量只设置为 cmake 调用： call：

OR the same thing, but environment variable are set only for this cmake call:

CXXFLAGS=-isystem\ /path/to/my/include cmake <path to my sources>

重要：您必须目录（即清除cmake缓存），然后启动任何此窗体。没有清除缓存cmake将继续使用您之前运行的缓存 CMAKE_CXX_FLAGS 。

直接设置 CMAKE_CXX_FLAGS in cmake string：

Directly setting CMAKE_CXX_FLAGS in cmake string:

cmake -DCMAKE_CXX_FLAGS=-isystem\ /path/to/my/include <path to my sources>

我相信可以通过更多'native'的方式，但我没有找到变量负责路径头文件cmake。

I believe that it can be done by more 'native' way, but I didn't find variable responsible for paths to headers in cmake.

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