如何用自制软件和 gcc-4.9 构建 openmpi？

Question

默认情况下 brew install openmpi 使用 clang 创建其包装。

我需要为包装器指定 gcc-4.9（已安装 Homebrew）。

我试过了

$export CC=gcc-4.9
$brew install openmpi

$brew install --cc=gcc-4.9 openmpi

$brew install --with-gcc49 openmpi

$brew install -CC=gcc-4.9 -CXX=g++-4.9 -FC=gfortran -F77=gfortran openmpi

$brew install openmpi --cc=gcc-4.9 

$brew install openmpi --CC=gcc-4.9 --CXX=g++-4.9 --FC=gfortran --F77=gfortran

最后，我修改了 openmpi 公式添加：

 args = %W[
  CC=gcc-4.9 
  CXX=g++-4.9 
  FC=gfortran 
  F77=gfortran

我还是

$mpicc --showme
clang -I/usr/local/Cellar/open-mpi/1.8.4/include -L/usr/local/opt/libevent/lib -L/usr/local/Cellar/open-mpi/1.8.4/lib -lmpi

Answer 1

最后解决如下：

1) 为自制程序添加环境变量（您也可以将这些行添加到您的~\.bashrc）：

export HOMEBREW_CC=gcc-4.9
export HOMEBREW_CXX=g++-4.9

2) 从源

重建并重新安装 openmpi 及其依赖项

brew reinstall openmpi --build-from-source

3) 最后您会收到如下消息：

==> Reinstalling open-mpi
==> Using Homebrew-provided fortran compiler.
This may be changed by setting the FC environment variable.
==> Downloading http://www.open-mpi.org/software/ompi/v1.8/downloads/openmpi-1.8.
Already downloaded: /Library/Caches/Homebrew/open-mpi-1.8.4.tar.bz2
==> ./configure --prefix=/usr/local/Cellar/open-mpi/1.8.4 --disable-silent-rules 
==> make all
==> make check
==> make install
Warning: open-mpi dependency gcc was built with a different C++ standard
library (libstdc++ from clang). This may cause problems at runtime.
  /usr/local/Cellar/open-mpi/1.8.4: 785 files, 23M, built in 41.2 minutes

$mpicc --showme 
gcc-4.9 -I/usr/local/Cellar/open-mpi/1.8.4/include -L/usr/local/opt/libevent/lib -L/usr/local/Cellar/open-mpi/1.8.4/lib -lmpi

在我的 MacBook 上，我与 XCode 6.2 有一些冲突，这些冲突在 this instructions

之后得到解决

但是，我决定继续使用 clang 版本以避免 gfortran 出现问题。

如何用自制软件和 gcc-4.9 构建 openmpi？

How to build openmpi with homebrew and gcc-4.9?

homebrew

gcc

clang

openmpi