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# Windows
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Here are detailed instructions on how to build GmshDDM on Windows, using Cygwin and the MinGW compilers. The resulting programs do *not* depend on the cygwin DLL, i.e. are pure Windows executables.
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## Cygwin and Windows PATH
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Install cygwin from https://www.cygwin.com. Accept all defaults and select View "Full". Install the following packages:
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* mingw64_x86_64-gcc-g++
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* mingw64_x86_64-gcc-fortran
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* cmake
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* make
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* openssh
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* python3
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* autoconf
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* automake
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* openssh
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* git
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* curl
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* unzip
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Type "path" in the Windows search box and choose "Edit the system environment variables". Go to "Advanced" and select "Environment variables". If the `PATH` variable does not exist (note the ALL CAPS!), create it and set it to
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```
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C:\cygwin64\usr\local\bin\;C:\cygwin64\usr\local\lib;C:\cygwin64\usr\local\petsc\complex_mumps_seq\lib;C:\cygwin64\usr\x86_64-w64-mingw32\sys-root\mingw\bin
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```
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If `PATH` already exists, append the value (don't forget the semicolon!).
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## Cygwin terminal and Bash environment variables
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Open the Cygwin terminal.
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Edit the `~/.bash_profile` and add the following at the end:
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```
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export PATH="${PATH}:/usr/x86_64-w64-mingw32/sys-root/mingw/bin:/usr/local/bin"
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export CXX=x86_64-w64-mingw32-g++
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export CC=x86_64-w64-mingw32-gcc
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export FC=x86_64-w64-mingw32-gfortran
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export PETSC_DIR=/usr/local/petsc
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export PETSC_ARCH=complex_mumps_seq
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```
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Then
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```shell
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cd
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source .bash_profile
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```
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## PETSc
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### Method 1: download a pre-built binary package
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```shell
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cd /usr/local
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curl -O https://gmsh.info/beta/petsc-Windows64.zip
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unzip petsc-Windows64.zip
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```
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### Method 2: build from source
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Download and configure PETSc:
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```shell
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cd /usr/local
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git clone -b maint https://gitlab.com/petsc/petsc.git petsc
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cd petsc
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./configure --CXX=x86_64-w64-mingw32-g++ --CC=x86_64-w64-mingw32-gcc --FC=x86_64-w64-mingw32-gfortran --with-clanguage=cxx --with-debugging=0 --with-mpi=0 --with-fortran-bindings=0 --download-mumps=yes --with-mumps-serial --with-shared-libraries=1 --with-x=0 --with-ssl=0 --with-scalar-type=complex --download-f2cblaslapack=1
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```
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Edit `complex_mumps_seq/include/petscconf.h` and set
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```
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#undef PETSC_HAVE_UNISTD_H
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#undef PETSC_HAVE_GETPAGESIZE
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#undef PETSC_HAVE_SLEEP
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```
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Build PETSc:
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```shell
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make
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```
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## Gmsh
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### Method 1: download our pre-built binary package
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```shell
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cd
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curl -O https://gmsh.info/bin/Windows/gmsh-git-Windows64-sdk.zip
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unzip gmsh-git-Windows64-sdk.zip
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mkdir /usr/local/include/
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cp gmsh-git-Windows64-sdk/include/* /usr/local/include/
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cp gmsh-git-Windows64-sdk/lib/* /usr/local/lib/
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cp gmsh-git-Windows64-sdk/bin/* /usr/local/bin/
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```
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### Method 2: build from source
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Download, build and install Gmsh (here we build a barebones version - see the Gmsh wiki to compile a full-featured version with OpenCASCADE, the graphical user interface, ...):
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```shell
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cd
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git clone https://gitlab.onelab.info/gmsh/gmsh.git
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cd gmsh
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mkdir build
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cd build
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cmake -DENABLE_BUILD_DYNAMIC=1 -DENABLE_PETSC=1 -DENABLE_OPENMP=1 ..
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make install
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```
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## GmshFEM
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Build and install GmshFEM:
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```shell
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cd
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git clone https://gitlab.onelab.info/gmsh/fem.git
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cd fem
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mkdir build
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cd build
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cmake ..
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make install
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``` |
