config BR2_PACKAGE_FFTW
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bool "fftw"
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select BR2_PACKAGE_FFTW_DOUBLE if !BR2_PACKAGE_FFTW_SINGLE \
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&& !BR2_PACKAGE_FFTW_LONG_DOUBLE && !BR2_PACKAGE_FFTW_QUAD
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help
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Library for computing Fast Fourier Transforms.
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This library computes Fast Fourier Transforms (FFT) in one
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or more dimensions. It is extremely fast. This package
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contains the shared library version of the fftw libraries in
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double precision.
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http://www.fftw.org
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if BR2_PACKAGE_FFTW
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source "package/fftw/fftw-single/Config.in"
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source "package/fftw/fftw-double/Config.in"
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source "package/fftw/fftw-long-double/Config.in"
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source "package/fftw/fftw-quad/Config.in"
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config BR2_PACKAGE_FFTW_FAST
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bool "optimise for speed over accuracy"
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help
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Optimise for fast math functions, at the expense of accuracy.
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Say 'y' if you need speed and can live with inaccuracies in
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the results. Say 'n' (the default) if accuracy is of utmost
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importance.
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This basically uses gcc's -Ofast optimisation level, which in
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turn is basically using gcc's -ffast-math. See the gcc manual
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for what this means.
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endif
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