OS X：已安装 gcc 链接到 clang

Question

我已经拥有gcc并g++安装：

$ which gcc
/usr/bin/gcc

$ which g++
/usr/bin/g++

$ brew install gcc
Warning: gcc-6.2.0 already installed

我按照在 OS X Yosemite 上使用 gcc 编译器编译 OpenMP 程序来gcc通过 HomeBrew 重新安装：

$ brew reinstall gcc --without-multilib

然后

$ /usr/bin/g++ openmp.cpp
openmp.cpp:12:10: fatal error: 'omp.h' file not found
#include <omp.h>
         ^
1 error generated.

和-fopenmp

$ /usr/bin/g++ openmp.cpp -fopenmp
clang: error: unsupported option '-fopenmp'
clang: error: unsupported option '-fopenmp'

这个重定向发生了什么？我该如何使用gcc/ g++？

---

虽然涉及，但并不是关于OpenMP。

Answer 1

brew在 中安装工具/usr/local/bin。使用/usr/local/bin/g++6：

$ /usr/local/bin/g++-6 --version
g++-6 (Homebrew gcc 6.2.0) 6.2.0
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.