[jamanfred]

I'm using Fedora 28 and would like to compile OpenFOAM from source. While following the instructions on the OpenFOAM website, I realized that the software provided in the ThirdParty repository were provided as packages in the Fedora repositories.

I'd like to use these packages with OpenFOAM, but the compilation fails at

g++ -std=c++11 -m64 -Dlinux64 -DWM_ARCH_OPTION=64 -DWM_DP -DWM_LABEL_SIZE=32 -Wall -Wextra -Wold-style-cast -Wnon-virtual-dtor -Wno-unused-parameter -Wno-invalid-offsetof -Wno-attributes -O3  -DNoRepository -ftemplate-depth-100 -DOMPI_SKIP_MPICXX -I/usr/include/openmpi-x86_64 -pthread -I.../OpenFOAM-6/src/Pstream/mpi/lnInclude -I.../ThirdParty-6/platforms/linux64GccDPInt32/scotch_6.0.3/include/openmpi-system -I.../ThirdParty-6/platforms/linux64GccDPInt32/scotch_6.0.3/include -I/usr/include/scotch -I../decompositionMethods/lnInclude -IlnInclude -I. -I.../OpenFOAM-6/src/OpenFOAM/lnInclude -I.../OpenFOAM-6/src/OSspecific/POSIX/lnInclude   -fPIC -shared -Xlinker --add-needed -Xlinker --no-as-needed .../OpenFOAM-6/platforms/linux64GccDPInt32OptSYSTEMOPENMPI/src/parallel/decompose/ptscotchDecomp/ptscotchDecomp.o -L.../OpenFOAM-6/platforms/linux64GccDPInt32OptSYSTEMOPENMPI/lib \
    -L.../ThirdParty-6/platforms/linux64GccDPInt32/scotch_6.0.3/lib -L.../ThirdParty-6/platforms/linux64GccDPInt32/lib/openmpi-system -lptscotch -lptscotcherrexit -lscotch -lrt  -o .../OpenFOAM-6/platforms/linux64GccDPInt32Opt/lib/openmpi-system/libptscotchDecomp.so
/usr/bin/ld: cannot find -lptscotch
/usr/bin/ld: cannot find -lptscotcherrexit
collect2: error: ld returned 1 exit status
make: *** [.../OpenFOAM-6/wmake/makefiles/general:169: .../OpenFOAM-6/platforms/linux64GccDPInt32Opt/lib/openmpi-system/libptscotchDecomp.so] Error 1

where ... is my general git repo directory ~/repos/ and I have modified my .bashrc accordingly.

How can I stop the make script from trying to use the ThirdParty directory over system packages?

[wyldckat]

Quick answer: There are several ways to compile Scotch and some of them are not compatible with the default build options in OpenFOAM.
I haven't checked Fedora 28, but sometime ago there was a report on how to make OpenFOAM more permissive regarding which Scotch build it is using: https://bugs.openfoam.org/view.php?id=2330 - however, the the core of the feature for allowing any Scotch build was not accepted.


That said, if you can figure out which Integer/FloatingPoint combo Scotch in Fedora 28 is using, you can configure the file "OpenFOAM-6/etc/config.sh/scotch" and then use:

1. The respective 32 or 64 "WM_LABEL_SIZE" value in "OpenFOAM-6/etc/bashrc" for the 32 or 64 bit integer mode in Scotch.
2. Use DP or SP in "WM_PRECISION_OPTION".

However, I don't know if Fedora 28 provides the development package for ParaView, without which you will not be able to build the ".OpenFOAM" file/case reader for ParaView.

[jamanfred]

Fedora does include a paraview-devel package, so I don't think that'll be a problem.

As for Scotch, I'm not sure how to find out what combination of bit representations it's using. The only hint I can find is in the Scotch header file. Maybe this part is relevant?

/*+ Integer type. +*/

typedef int64_t SCOTCH_Idx;

typedef int SCOTCH_Num;

Everything else declared in the Scotch header files (scotch and ptscotch) is of the following types:
int and void (for C headers)
double (for C opaque objects)
INTEGER (for Fortran headers)

Is this the correct way to go about finding this information?

[wyldckat]

Quick answers:

Originally Posted by jamanfred

Fedora does include a paraview-devel package, so I don't think that'll be a problem.

Nice! I'll have to look into that!


I haven't tried that, but in principle it's just a matter of configuring the environment variable "ParaView_DIR" to point to the base folder where ParaView has its folders... which on Fedora may be "/usr", e.g. setting:

export ParaView_DIR=/usr

You can edit the file "OpenFOAM-*/etc/config.sh/paraview" accordingly.


It's later used in the folder "$FOAM_UTILITIES/postProcessing/graphics/PVReaders":

echo $FOAM_UTILITIES/postProcessing/graphics/PVReaders

to see where that is.

Originally Posted by jamanfred

As for Scotch, I'm not sure how to find out what combination of bit representations it's using. The only hint I can find is in the Scotch header file. Maybe this part is relevant?

/*+ Integer type. +*/

typedef int64_t SCOTCH_Idx;

 typedef int SCOTCH_Num;

OK, it seems that it's meant to be used with 64-bit labels in OpenFOAM. Namely you need to set "WM_LABEL_SIZE=64" in "OpenFOAM-*/etc/bashrc".
And possibly edit the file "OpenFOAM-*/etc/config.sh/scotch" accordingly.

Originally Posted by jamanfred

Is this the correct way to go about finding this information?

The RPM script used by Fedora to build the package... but am not certain where to find it.