更改CMake的文件的标准位置 [英] Changing CMake files standard location

问题描述

我有一个叫做幽灵-DIR /文件夹中的源目录，我把所有生成的文件，我不需要。我希望把所有生成的文件由本的CMake幻影目录中（连同其它生成和丑陋的文件）。

I have a source directory with a folder called "phantom-dir/" where I put all generated files I don't need. I want to put all generated files by CMake inside this phantom directory (together with other generated and "ugly" files).

一个小例子：

$ mkdir cmake-test
$ cd cmake-test
$ echo 'message("Hello World!")' > CMakeLists.txt
$ cmake . | grep "Hello"
Hello World!
$ tree
.
├── CMakeCache.txt
├── CMakeFiles
│   ├── CMakeCCompiler.cmake
│   ├── cmake.check_cache
│   ├── CMakeCXXCompiler.cmake
│   ├── CMakeDetermineCompilerABI_C.bin
│   ├── CMakeDetermineCompilerABI_CXX.bin
│   ├── CMakeDirectoryInformation.cmake
│   ├── CMakeOutput.log
│   ├── CMakeSystem.cmake
│   ├── CMakeTmp
│   ├── CompilerIdC
│   │   ├── a.out
│   │   └── CMakeCCompilerId.c
│   ├── CompilerIdCXX
│   │   ├── a.out
│   │   └── CMakeCXXCompilerId.cpp
│   ├── Makefile2
│   ├── Makefile.cmake
│   ├── progress.marks
│   └── TargetDirectories.txt
├── cmake_install.cmake
├── CMakeLists.txt
└── Makefile

4 directories, 20 files

在默认情况下，所有文件的CMake（CMakeCache.txt，cmake_install.cmake，Makefile文件，CMakeFiles）被写入工作目录。但是，我想是这样的：

By default, all CMake files (CMakeCache.txt, cmake_install.cmake, Makefile, CMakeFiles) are written in the working directory. But, I want something like that:

$ mkdir cmake-test
$ cd cmake-test
$ mkdir phantom-dir
$ echo 'message("Hello World!")' > CMakeLists.txt
$ // editing CMakeLists.txt to set some cmake variables.
$ cmake . | grep "Hello"
Hello World!
$ tree
.
├── phantom-dir
│   ├── CMakeCache.txt
│   ├── CMakeFiles
│   │   ├── CMakeCCompiler.cmake
│   │   ├── cmake.check_cache
│   │   ├── CMakeCXXCompiler.cmake
│   │   ├── CMakeDetermineCompilerABI_C.bin
│   │   ├── CMakeDetermineCompilerABI_CXX.bin
│   │   ├── CMakeDirectoryInformation.cmake
│   │   ├── CMakeOutput.log
│   │   ├── CMakeSystem.cmake
│   │   ├── CMakeTmp
│   │   ├── CompilerIdC
│   │   │   ├── a.out
│   │   │   └── CMakeCCompilerId.c
│   │   ├── CompilerIdCXX
│   │   │   ├── a.out
│   │   │   └── CMakeCXXCompilerId.cpp
│   │   ├── Makefile2
│   │   ├── Makefile.cmake
│   │   ├── progress.marks
│   │   └── TargetDirectories.txt
│   ├── cmake_install.cmake
├── CMakeLists.txt
└── Makefile

4 directories, 20 files

这意味着：在Makefile在当前目录（。cmake的＆功放;＆放大器;使之作，），但幽灵目录中剩余的生成的文件

That means: the Makefile in the current directory (to make, "cmake . && make"), but the remaining generated files inside the "phantom" directory.

我知道我可以使它：

$ cd phantom-dir/
$ cmake ../

但它是一个有点无聊，我要我要重新编译或翻拍CMake的，最重要的是考虑到我修改很多次我的CMakeLists.txt每次都做到这一点。

But it's a little tiresome for me to do it each time I want to re-compiling or remake cmake, above all taking into account that I'm modifying many times my CMakeLists.txt.

我有哪些变量中的CMakeLists.txt文件来设置，以实现呢？

Which variables I have to set in the CMakeLists.txt file in order to achieve it?

推荐答案

您可以利用的无证CMake的选项 -H 和 -B 来避免留下您的源代码目录。 -H 指定的路径，主要的CMakeLists.txt文件， -B 指定所需的build目录的路径

You could make use of the undocumented CMake options -H and -B to avoid leaving your source dir. -H specifies the path to the main CMakeLists.txt file, and -B specifies the path to your desired build directory.

cmake -H. -Bphantom-dir

请注意，这些都是无证，所以我想可以在任何时候Kitware人感觉改变。

Note that these are undocumented and so I suppose could change at any time the Kitware guys feel like.

要生成项目不离开你的源代码目录，你可以使用（官方）选项的 - 建立 这是一个跨平台的方式来调用您所选择的构建工具，你可以通过你想这个工具的任何标志。例如。

To build your project without leaving your source dir, you can make use of the (official) option --build This is a cross-platform way to invoke your chosen build tool, and you can pass whatever flags you want to this tool. e.g.

cmake --build phantom-dir -- -j3

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