C++ CMake如何选择gcc和g++进行编译？
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How does CMake choose gcc and g++ for compiling?
提问by feelfree
I am newbie of CMake, and I was wondering for a C++/C project in the LINUX environmental how CMake can choose compilers between gcc and g++. More specifically, my questions are as follows:
我是 CMake 的新手，我想知道 LINUX 环境中的 C++/C 项目，CMake 如何在 gcc 和 g++ 之间选择编译器。更具体地说，我的问题如下：
- If a project is consisted of .c and .cpp file, is it true that the .c files will be compiled by gcc while the .cpp files will be compiled by g++?
- If a project has only c files or cpp files, what's the default compiling operation for CMake? Will it be possible to change it?
- 如果一个项目是由.c和.cpp文件组成的，那么.c文件会被gcc编译而.cpp文件会被g++编译吗？
- 如果一个项目只有c文件或cpp文件，CMake的默认编译操作是什么？有可能改变它吗？
采纳答案by luk32
Shortly, yes to both.
很快，两者都是。
You can mangle with pretty much everything. There are flags and variables that bind extensions to language; and then language to compiler options/executables that define toolsets and build targets.
你几乎可以处理所有事情。有将扩展绑定到语言的标志和变量；然后将语言转换为定义工具集和构建目标的编译器选项/可执行文件。
Check following links to documentation. Those are some pleasant short readings.
检查以下文档链接。这些是一些令人愉快的简短阅读。
Note: The wiki might be outdated but it should hold in case of important and educational matter.
注意：维基可能已经过时，但它应该在重要和教育问题的情况下保持不变。
PS. There is whole bunch of related options. For some longer read you can check following sections of documentation: Properties on Source Filesand Variables for Languages. 2. and 3. come from these sections.
附注。有一大堆相关的选项。如需更长的阅读时间，您可以查看文档的以下部分：源文件的属性和语言变量。2. 和 3. 来自这些部分。
回答by martiert
As far as I know CMake only look at the file extensions. So if you rename your .c file to .cpp it will, as far as I know, be compiled with g++.
据我所知，CMake 只看文件扩展名。因此，如果您将 .c 文件重命名为 .cpp，据我所知，它将使用 g++ 进行编译。
It is easy to change that behaviour. CMake uses environment variables to see which compiler to use. If you would like to change compiler to e.g. clang and clang++, you can just do
改变这种行为很容易。CMake 使用环境变量来查看要使用的编译器。如果您想将编译器更改为例如 clang 和 clang++，您可以这样做
export CC=clang export CXX=clang++
export CC=clang export CXX=clang++
before running cmake.
在运行 cmake 之前。
