Building on M1 Mac

[Maxwell-Rosen]

Currently Gkeyll has an issue with how M1 Macs deal with denormalized floating point numbers. There is some key functionality that is removed due to this.

Currently, 4 unit tests fail. test_TenMomenSrc.lua, test_VlasovRect.lua, test_EvalOnNodes.lua, test_CartGrid.lua.

To build, in gkyl.cxx in the main directory, one must comment out - _MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON); and - fesetenv(FE_DFL_DISABLE_SSE_DENORMS_ENV);

In Updater/wscript, delete the following lines

FemPerpPoissonImpl.cpp
FemParPoissonImpl.cpp
FemMatrices.cpp
FemGyroaverageImpl.cpp
EvalOnNodesImpl.cpp