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mac中OpenMP环境安装

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2019年5月25日 下午9:45

自己编写的指令：

openmp_bin

macos - Enable OpenMP support in clang in Mac OS X (Sierra & Mojave) - Stack Overflow

安装指令：

brew install llvm

安装结果，这个结果中提示了一些重要的配置信息

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==> Summary
🍺  /usr/local/Cellar/llvm/8.0.0_1: 6,807 files, 3.3GB
Error: libomp 7.0.0 is already installed
To upgrade to 8.0.0, run `brew upgrade libomp`.
==> Caveats
==> llvm
To use the bundled libc++ please add the following LDFLAGS:
  LDFLAGS="-L/usr/local/opt/llvm/lib -Wl,-rpath,/usr/local/opt/llvm/lib"

llvm is keg-only, which means it was not symlinked into /usr/local,
because macOS already provides this software and installing another version in
parallel can cause all kinds of trouble.

If you need to have llvm first in your PATH run:
  echo 'export PATH="/usr/local/opt/llvm/bin:$PATH"' >> ~/.bash_profile

For compilers to find llvm you may need to set:
  export LDFLAGS="-L/usr/local/opt/llvm/lib"
  export CPPFLAGS="-I/usr/local/opt/llvm/include"

openMP程序编译执行方法

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localhost:OpenMP czh$ /usr/local/opt/llvm/bin/clang -fopenmp test.c
localhost:OpenMP czh$ ls
a.out	test.c
localhost:OpenMP czh$ a.out
-bash: a.out: command not found
localhost:OpenMP czh$ ./a.out
Hello World from thread = 0
Number of threads = 4
Hello World from thread = 2
Hello World from thread = 3
Hello World from thread = 1

~/.bash_profile的配置，简化编译指令alias

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#llvm OpenMP
export PATH="/usr/local/opt/llvm/bin:$PATH"
alias openmp_bin='/usr/local/opt/llvm/bin/clang -fopenmp'
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localhost:OpenMP czh$ openmp_bin test.c
localhost:OpenMP czh$ ls
a.out	test.c