BUG: export minimal compiler flags for VTK, ParaView (fixes #44)
- in 1906, we changed the handling of compiler flags to include the exact values as used by OpenFOAM. While this is needed for compiling some external programs -- see OpenFOAM-plus#1256 for the discussion -- it appears to bring in flags that upset some of the ParaView (and possibly VTK) compilation. The culprits are likely to be found in the various '-W' switches, but for now we simply extract a mininal set of compiler flags that include -std=c++11 -m64 -fPIC, but no optimization flags, additional warnings flags or OpenFOAM-specific defines.
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