freefoam: FTBFS with libopenmpi 1.10

[Santiago Vila]

On Sun, 7 Feb 2016, Mattia Rizzolo wrote:

> undefined reference to `yyFlexLexer::yywrap()'

Ok, since I'm planning to use this program myself, I searched for a fix.
This seems to be a problem with new flex behaviour.

Code written to work with "old" flex need this declaration:

extern "C" int yywrap()

and code written to work with "new" flex need this one:

int yyFlexLexer::yywrap()

The authors combined both things with a preprocessor conditional:

#if YY_FLEX_SUBMINOR_VERSION < 34
 extern "C" int yywrap()
#else
 int yyFlexLexer::yywrap()
#endif

but this assumes that flex is 2.5.x where x is YY_FLEX_SUBMINOR_VERSION.

If flex is 2.6.0, which is also the "new" flex, then 0 < 34 is true and the wrong
code is used.

I found the official fix in openfoam here:

http://bugs.openfoam.org/view.php?id=2066

which is to write the condition in this way:

#if YY_FLEX_MINOR_VERSION < 6 && YY_FLEX_SUBMINOR_VERSION < 34

The affected files are the following:

src/surfMesh/surfaceFormats/stl/STLsurfaceFormatASCII.L
src/triSurface/triSurface/interfaces/STL/readSTLASCII.L
src/thermophysicalModels/reactionThermo/chemistryReaders/chemkinReader/chemkinLexer.L
applications/utilities/mesh/conversion/fluentMeshToFoam/fluentMeshToFoam.L
applications/utilities/mesh/conversion/ansysToFoam/ansysToFoam.L
applications/utilities/mesh/conversion/fluent3DMeshToFoam/fluent3DMeshToFoam.L
applications/utilities/mesh/conversion/gambitToFoam/gambitToFoam.L

and the resulting patch is attached (warning: I have not actually
tested it, I have only explained why the patch is required :-).

BTW: freefoam seems to be dead, why aren't we packaging openfoam instead?

Thanks.
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