How to build openmpi with homebrew and gcc-4.9?
10,859
Finally it was solved as follows:
1) Add environment variables for homebrew (you can also add these lines to your ~\.bashrc
):
export HOMEBREW_CC=gcc-4.9
export HOMEBREW_CXX=g++-4.9
2) Rebuild and reinstall openmpi
and its dependencies from source
brew reinstall openmpi --build-from-source
3) In the end you will get a message like:
==> 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
On my MacBook I had some conflicts with XCode 6.2, which were solved following this instructions
However, I decided to stay with the clang
version to avoid issues with gfortran
.
Author by
ilciavo
Updated on June 27, 2022Comments
-
ilciavo almost 2 years
By default
brew install openmpi
usesclang
to create its wrapper.I need to specify
gcc-4.9
(Homebrew installed) for the wrapper.I have tried
$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
Finally, I've modified the
openmpi
formula adding:args = %W[ CC=gcc-4.9 CXX=g++-4.9 FC=gfortran F77=gfortran
I still get
$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
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Chiel almost 8 yearsWhy did you decide to stay with clang to avoid issues with gfortran? I do not get this statement.
-
ilciavo almost 8 years@Chiel I used to had issues when building with
openmpi
andgfortran
, thus buildingopenmpi
withclang
inhibittedgfortran
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Bart over 7 yearsWorked perfectly for me, without any issues! And our MPI application runs a lot faster (~30%) when using openMPI compiled with GCC instead of openMPI with clang.
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ilciavo over 7 years@bart which versions of GCC and openMPI are you using?
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Bart over 7 years@ilciavo GCC 6.1 with openMPI 1.10.2
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ilciavo over 7 years@Bart you're right the issue disappeared with GCC 6.1 but it is still present if you want to build with gcc-4.9
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blkpingu over 2 yearscan you update this answer to current versions?