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DOC Improve documentation for macOS Homebrew libomp installation #31361

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DOC Improve documentation for macOS Homebrew libomp installation #31361

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27 changes: 27 additions & 0 deletions doc/developers/advanced_installation.rst
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Expand Up @@ -286,11 +286,38 @@ Set the following environment variables:

export CC=/usr/bin/clang
export CXX=/usr/bin/clang++

Next, configure flags for OpenMP. The specific paths for ``libomp`` depend on your
Mac's architecture as Homebrew uses different installation prefixes. You can find the
correct paths by running the following command:

.. prompt:: bash $

brew --prefix libomp

For Intel-based Macs

.. prompt:: bash $

export CPPFLAGS="$CPPFLAGS -Xpreprocessor -fopenmp"
export CFLAGS="$CFLAGS -I/usr/local/opt/libomp/include"
export CXXFLAGS="$CXXFLAGS -I/usr/local/opt/libomp/include"
export LDFLAGS="$LDFLAGS -Wl,-rpath,/usr/local/opt/libomp/lib -L/usr/local/opt/libomp/lib -lomp"

For Apple Silicon Macs

.. prompt:: bash $

export CPPFLAGS="-I/opt/homebrew/opt/libomp/include"
export LDFLAGS="-L/opt/homebrew/opt/libomp/lib"

.. prompt:: bash $

export CPPFLAGS="$CPPFLAGS -Xpreprocessor -fopenmp"
export CFLAGS="$CFLAGS -I/opt/homebrew/opt/libomp/include"
export CXXFLAGS="$CXXFLAGS -I/opt/homebrew/opt/libomp/include"
export LDFLAGS="$LDFLAGS -Wl,-rpath,/opt/homebrew/opt/libomp/lib -L/opt/homebrew/opt/libomp/lib -lomp"

Finally, build scikit-learn in verbose mode (to check for the presence of the
``-fopenmp`` flag in the compiler commands):

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