OpenFlow Build Process

To build OpenFOAM® for Windows with a cross-compiler requires expert knowledge of Windows and Linux utilities and compilers.

Instructions based on "OpenFOAM 2.1.x on Windows 64-bit with MS MPI"

The following steps are required to produce a native Windows version of OpenFOAM 2.1.x 64-bit with [optional] native Windows MS MPI:

1. Install MinGW-w64 cross-compiler and zlib on Linux
2. Install zlib files into following locations:
   • <mingw-w64>/x86_64-w64-mingw32/include/zconf.h
   • <mingw-w64>/x86_64-w64-mingw32/include/zlib.h
   • <mingw-w64>/bin/zlib1.dll
   • <mingw-w64>/x86_64-w64-mingw32/lib/libz.a
   • <mingw-w64>/x86_64-w64-mingw32/lib/libzdll.a
3. If you see an error while compiling like:
   signals/sigFpe.C:45:15: error: '_clearfp' was not declared in this scope
   You need to add #include_next <float.h> to the end of
   <mingw-w64>/lib/gcc/x86_64-w64-mingw32/<gcc-version>/include/float.h and remove it from
   <mingw-w64>/x86_64-w64-mingw32/include/float.h to include the right float.h
4. [optional] Create libmsmpi.a from Microsoft MPI Redistributable
5. At various stages during this process you will need to set OpenFOAM MinGW-w64 environment variables and source etc/bashrc. As an example:
   export FOAM_INST_DIR="$(HOME)/projects/of/2.1"; source $(FOAM_INST_DIR)/OpenFOAM-2.1.x/etc/bashrc WM_OSTYPE=MSwindows WM_COMPILER=mingw-w64 WM_ARCH_OPTION=64 WM_PRECISION_OPTION=SP WM_CC=x86_64-w64-mingw32-gcc WM_CXX=x86_64-w64-mingw32-g++ compilerInstall=system [optional] WM_MPLIB=MSMPI [optional] MPI_ARCH_PATH="$(HOME)/projects/msmpi/install"
6. [optional] Build scotch (in WM_THIRD_PARTY_DIR = ThirdParty-2.1.x) according to:
   1. ln -s $(WM_THIRD_PARTY_DIR)/scotch<version> $(WM_THIRD_PARTY_DIR)/scotch
   2. ln -s $(WM_PROJECT_DIR)/extra/scotch/src/Make.inc/Makefile.inc.mingw-w64 $(WM_THIRD_PARTY_DIR)/scotch/src/Makefile.inc
   3. cp $(WM_PROJECT_DIR)/extra/scotch/src/libscotch/* $(WM_THIRD_PARTY_DIR)/scotch/src/libscotch/.
   4. cd $(WM_THIRD_PARTY_DIR)/scotch/src
   5. cp $(WM_PROJECT_DIR)/extra/scotch/src/Makefile .
   6. make libscotch
   7. mkdir -p $(FOAM_LIBBIN)
   8. cd $(WM_THIRD_PARTY_DIR)/scotch/src/libscotch
   9. cp libscotch.* $(FOAM_LIBBIN)
7. To build OpenFOAM:
   1. source the OpenFOAM native linux environment variables
   2. cd $(WM_PROJECT_DIR)/wmake/src; make
   3. ln -s $(WM_PROJECT_DIR)/wmake/platforms/linux64Gcc $(WM_PROJECT_DIR)/wmake/platforms/linux64mingw-w64
   4. source the OpenFOAM MinGW-w64 environment variables
   5. cd $(WM_PROJECT_DIR);./Allwmake
8. Transfer the OpenFOAM etc directory ($(WM_PROJECT_DIR)/etc), executables ($(WM_PROJECT_DIR)/platforms/linux64mingw-w64*/bin/*.exe), and libraries ($(WM_PROJECT_DIR)/platforms/linux64mingw-w64*/lib/*.dll and $(WM_PROJECT_DIR)/platforms/linux64mingw-w64*/lib/*/*.dll) to the Windows computer
9. Transfer the MinGW-w64 libraries:
   • <mingw-w64>/bin/zlib1.dll
   • <mingw-w64>/bin/libgcc_s_sjlj-1.dll
   • <mingw-w64>/bin/libstdc++-6.dll

   to the Windows computer

10. On the Windows computer ensure the following environment variables are set:
    • The WM_PROJECT_DIR and USERNAME variables are set.
    • The PATH variable is set to include the OpenFOAM executable and library locations (including $(WM_PROJECT_DIR)/lib/linux64mingw-w64*/dummy or [optional] $(WM_PROJECT_DIR)/lib/linux64mingw-w64*/msmpi).

OpenFOAM is a registered trademark of OpenCFD and is unaffiliated with Symscape