如何获取CMake使用默认编译器在系统PATH？ [英] How to Get CMake to Use Default Compiler on System PATH?

问题描述

目前，我从我的构建目录调用CMake如下：

CXX =/ opt / gcc-4.8 / bin / g ++cmake ..

来获取CMake使用这个特定的编译器。

我的PATH有 /opt/gcc-4.8/bin 在一切的前面。所以，而不是前面的环境变量是有办法指定在`CMakeLists.txt文件中使用默认的g ++路径？

解决方案

CMake尊重 PATH 环境变量的设置，优先于通用编译器名称 cc 和 c ++ 。要确定CMake在UNIX下默认使用哪个C编译器，请运行：

  $ which cc 
  
 
 
 
要确定默认的C ++编译器，请运行：
  $ which c ++ 
  
如果生成符号链接在 /opt/gcc-4.8/bin 中指向 /opt/gcc-4.8/bin/g ++  / code>，CMake应该默认使用GCC 4.8。
 
Currently, I invoke CMake from my build directory as follows:

CXX="/opt/gcc-4.8/bin/g++" cmake  .. 

to get CMake to use this particular compiler. Otherwise it uses the operating system default compiler.

My PATH has "/opt/gcc-4.8/bin" in front of everything else. So, instead of prepending the environmental variable is there way to specify in the "`CMakeLists.txt" file to use the default g++ on the path? 
解决方案
CMake honors the setting of the PATH environment variable, but gives preference to the generic compiler names cc and c++. To determine which C compiler will be used by default under UNIX by CMake, run:
$ which cc
To determine the default C++ compiler, run:
$ which c++
If you generate a symbolic link c++ in /opt/gcc-4.8/bin which points to /opt/gcc-4.8/bin/g++, CMake should use GCC 4.8 by default.

                        
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