Mac自带Clang是一个C语言、C++、Objective-C语言的轻量级编译器。Clang是由苹果公司自己从头开发的，与GCC系统相比更加小巧，但是与GCC可以兼容。
最近编译一个c++程序时，Clang总是报错：
clang: error unsupported option '-fopenmp'
#1. 解决办法-安装GCC
##2. Homebrew(mac系统没有自带)
Homebrew官网：https://brew.sh/
Homebrew是一个适用于macOS、Linux的软件包管理工具。
###2.1 安装Homebrew
$ /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
###2.2 Homebrew使用
$ brew -h
Example usage:
brew search [TEXT|/REGEX/]
brew info [FORMULA...]
brew install FORMULA...
brew update
brew upgrade [FORMULA...]
brew uninstall FORMULA...
brew list [FORMULA...]
Troubleshooting:
brew config
brew doctor
brew install --verbose --debug FORMULA
Contributing:
brew create [URL [--no-fetch]]
brew edit [FORMULA...]
Further help:
brew commands
brew help [COMMAND]
man brew
https://docs.brew.sh
##3. 安装GCC
$ brew install gcc
Homebrew安装的软件一般在/usr/local/Cellar,并且会在/usr/local/bin/下创建链接。
- 查看安装的GCC
$ ls /usr/local/bin/gcc*
/usr/local/bin/gcc-10 /usr/local/bin/gcc-nm-10
/usr/local/bin/gcc-ar-10 /usr/local/bin/gcc-ranlib-10
- 查看自带的Clang
$ which clang
/Users/liuxiaojian/anaconda3/bin/clang
- mac的GCC默认链接到Clang
$ which gcc
/usr/bin/gcc
#编译程序
$ /usr/local/bin/g++-10 x.cpp -o x
