Compilation

Building GmshFEM on Windows

Here are detailed instructions on how to build GmshFEM on Windows, using Cygwin and the MinGW compilers. The resulting programs do not depend on the cygwin DLL, i.e. are pure Windows executables.

Cygwin and Windows PATH

Install cygwin from https://www.cygwin.com. Accept all defaults and select View "Full". Install the following packages:

mingw64_x86_64-gcc-g++
mingw64_x86_64-gcc-fortran
cmake
make
openssh
python3
autoconf
automake
openssh
git
wget
unzip

Also useful for debugging

Also useful for editing text files

emacs-w32

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

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

If PATH already exists, append the value (don't forget the semicolon!).

Cygwin terminal and Bash environment variables

Open the Cygwin terminal.

Edit the ~/.bash_profile and add the following at the end:

export PATH="${PATH}:/usr/x86_64-w64-mingw32/sys-root/mingw/bin:/usr/local/bin"
export CXX=x86_64-w64-mingw32-g++
export CC=x86_64-w64-mingw32-gcc
export FC=x86_64-w64-mingw32-gfortran
export PETSC_DIR=/usr/local/petsc
export PETSC_ARCH=complex_mumps_seq

Then

cd
source .bash_profile

PETSc

Method 1: download a pre-built binary package

cd /usr/local
wget https://gmsh.info/beta/petsc-Windows64.zip
unzip petsc-Windows64.zip

Method 2: build from source

Download and configure PETSc:

cd /usr/local
git clone -b release https://gitlab.com/petsc/petsc.git petsc
cd petsc
./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

Warning: this uses the generic fortran BLAS/LAPACK implementation; for better performance you should install and use optimized BLAS/LAPACK libraries (e.g. OpenBLAS) instead.

Edit complex_mumps_seq/include/petscconf.h and set

#undef PETSC_HAVE_UNISTD_H
#undef PETSC_HAVE_GETPAGESIZE
#undef PETSC_HAVE_SLEEP
#undef PETSC_HAVE_IEEEFP_H

Build PETSc:

make

Gmsh

Method 1: download a pre-built binary package

cd
wget https://gmsh.info/bin/Windows/gmsh-git-Windows64-sdk.zip
unzip gmsh-git-Windows64-sdk.zip
mkdir /usr/local/include/
cp gmsh-git-Windows64-sdk/include/* /usr/local/include/
cp gmsh-git-Windows64-sdk/lib/* /usr/local/lib/
cp gmsh-git-Windows64-sdk/bin/* /usr/local/bin/

Method 2: build from source

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, ...):

cd
git clone https://gitlab.onelab.info/gmsh/gmsh.git
cd gmsh
mkdir build
cd build
cmake -DENABLE_BUILD_DYNAMIC=1 -DENABLE_PETSC=1 -DENABLE_OPENMP=1 ..
make install

GmshFEM

Build and install GmshFEM:

cd
git clone https://gitlab.onelab.info/gmsh/fem.git
cd fem
mkdir build
cd build
cmake ..
make install

Compile an example:

cd
cd fem/demos/poisson/dirichlet
mkdir build
cd build
cmake ..
make
./demo.exe