build_win_msys.md

+## Windows - MSYS2
+
+**Install MSYS2**  
+Get [MSYS2](https://www.msys2.org) and install it where you have read/write privileges (e.g. C:\msys64).  
+Open a MSYS terminal and perform basic configuration
+```sh
+pacman -Syu
+```
+We asked to do so, close the terminal (ignore the warning saying that a process is running), and open a new one
+```sh
+pacman -Su
+```
+
+**Get pre-compiled packages**  
+Open a MSYS terminal
+```sh
+pacman -S make
+pacman -S mingw-w64-x86_64-tools-git
+pacman -S mingw-w64-x86_64-gcc-fortran
+pacman -S mingw-w64-x86_64-cmake
+pacman -S mingw-w64-x86_64-swig
+pacman -S mingw-w64-x86_64-gcc
+pacman -S mingw-w64-x86_64-eigen3
+pacman -S mingw-w64-x86_64-intel-tbb
+pacman -S mingw-w64-x86_64-openblas
+# python 3
+pacman -S mingw-w64-x86_64-vtk
+pacman -S mingw-w64-x86_64-python3
+pacman -S mingw-w64-x86_64-python3-numpy
+pacman -S mingw-w64-x86_64-python3-scipy
+pacman -S mingw-w64-x86_64-python3-matplotlib
+pacman -S mingw-w64-x86_64-python3-pyqt5
+# optional (needed to build the documentation)
+[pacman -S mingw-w64-x86_64-doxygen]
+[pacman -S mingw-w64-x86_64-graphviz]
+```
+
+*Notes*:  
+- A python binding for vtk is currently broken (vtkIOMySQL). To disable it, comment the related line in path/to/msys/mingw64/lib/python3.8/site-packages/vtkmodules/all.py (around line 86: ```from .vtkIOMySQL import *```)
+- nb lpx : 11/2020 : the upper problem seems to have been solved
+
+**Compile packages**
+1) MUMPS (optional)  
+Get [MUMPS with CMake](https://gitlab.uliege.be/am-dept/MN2L/mumps-4.10.0).
+Open a MSYS-MINGW64 terminal
+```sh
+mkdir build && cd build
+export MINGW_LOC=/path/to/msys/mingw
+cmake -C ../Cmake/msys.cmake ..
+make [-j4] install
+```
+
+2) MS-MPI (optional)  
+Install [MSMPI](https://www.microsoft.com/en-us/download/details.aspx?id=100305) and the related SDK and copy the header
+```sh
+cp "$MSMPI_INC/mpi.h" /path/to/msys/mingw64/include
+```
+Modify mpi.h by adding `#include <stdint.h>` just above `typedef int_64t MPI_Aint;`
+
+3) mpi4py (optional)  
+Get [mpi4py](https://bitbucket.org/mpi4py/mpi4py/downloads/). Open a MSYS-MINGW terminal and install mpi4py
+```sh
+python setup.py build
+python setup.py install
+```
+
+**Install packages**  
+Install [gmsh](http://geuz.org/gmsh) and add it to MSYS path. Open a WINDOWS console (admin mode)
+```msdos
+mkdir \path\to\msys\usr\local\bin
+mklink \path\to\msys\usr\local\bin\gmsh.exe "\path\to\gmsh"
+```
+
+**Build**  
+Get [git for windows](https://git-scm.com/download/win), or alternatively, install git using pacman (`pacman -S mingw-w64-x86_64-git`), then clone DART
+```sh
+git lfs install # enable large file support
+git clone git@gitlab.uliege.be:am-dept/dart.git
+```
+Compile DART in a MSYS-MINGW terminal
+```sh
+cd dartflo
+mkdir build && cd build
+export INCLUDE="${INCLUDE}:/mingw64/include/eigen3"
+cmake -C ../CMake/msys2.cmake ..
+make [-j4]
+ctest [-j4]
+[make install]
+```
+For a complete list of options, refer to the [build](Build) page.  
+
+*Note*: test tbox/mpi/helloworld.py requires MS-MPI and mpi4py to work
+
+**Run an example**
+```sh
+cd ..
+python run.py waves/tests/lift.py [-k4] [--nogui]
+```
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