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upgrade to fftw-3.3.10

Alexander Pace requested to merge alexander.pace/fftw:main into main

The changes to fftw.spec are:

  • upgrading the package version to 3.3.10
  • Adding a compiler switch that adds --enable-avx512 for versions of gcc that support the instruction set (4.9.0)

I tested this in a SL7 container (gcc 4.8.5), and in a RL8 container (gcc 8). rpmbuild builds and performs checks without issue. The RL8 libraries contain avx512 calls (according to nm and grep), but i haven't been able to test it because i don't have access to avx512 hardware.

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