Changes (by Roland Haas):

Allow setting parameter values at build time, enabling additional compiler optimisations. I measured that e.g. ML_BSSN runs 5% to 10% faster if its parameters are chosen at build time.

This introduces macros CCTK_PARAMETER__${thorn}__${parameter}. If unset, the parameter value is taken from the parameter file (default). If set at compile time, e.g. via a -D option in CPPFLAGS, this overrides the parameter database, and DECLARE_CCTK_PARAMETERS will always use this value.

Keyword:

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/1287/allow-setting-parameters-at-build-time