Fixes for GCC 12. Update to haswell by default

GEOS-ESM / ESMA_cmake

Custom CMake macros for the GEOS Earth System Model

Apache License 2.0

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Fixes for GCC 12. Update to haswell by default #276

Closed mathomp4 closed 2 years ago

mathomp4 commented 2 years ago

This PR updates the default -march for GCC on Intel chips to be haswell. Testing has shown this to be more stable with GCC 12 than westmere on both discover and Intel MacBooks.