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Peter W. Draper authored
When moving from AC_OPENMP and AX_OPENMP we stopped AC_SUBST of OPENMP_CFLAGS and these haven't been used since. Fix that, but do that by only using the OPENMP_CFLAGS as needed, that is as compiler hints for vectorizing some loops in the gravity interactions and only requiring the OpenMP runtime when linking against an OpenMP FFTW library.
Peter W. Draper authoredWhen moving from AC_OPENMP and AX_OPENMP we stopped AC_SUBST of OPENMP_CFLAGS and these haven't been used since. Fix that, but do that by only using the OPENMP_CFLAGS as needed, that is as compiler hints for vectorizing some loops in the gravity interactions and only requiring the OpenMP runtime when linking against an OpenMP FFTW library.
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