Add buildroot 2018-02

buildroot/package/fftw/Config.in

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+config BR2_PACKAGE_FFTW
+	bool "fftw"
+	help
+	  Library for computing Fast Fourier Transforms.
+
+	  This library computes Fast Fourier Transforms (FFT) in one
+	  or more dimensions. It is extremely fast. This package
+	  contains the shared library version of the fftw libraries in
+	  double precision.
+
+	  http://www.fftw.org
+
+if BR2_PACKAGE_FFTW
+
+config BR2_PACKAGE_FFTW_USE_SSE
+	bool
+
+config BR2_PACKAGE_FFTW_USE_SSE2
+	bool
+
+config BR2_PACKAGE_FFTW_USE_NEON
+	bool
+
+choice
+	prompt "fftw precision"
+	default BR2_PACKAGE_FFTW_PRECISION_DOUBLE
+	help
+	  Selects fftw precision
+
+config BR2_PACKAGE_FFTW_PRECISION_SINGLE
+	bool "single"
+	select BR2_PACKAGE_FFTW_USE_SSE if BR2_X86_CPU_HAS_SSE
+	select BR2_PACKAGE_FFTW_USE_SSE2 if BR2_X86_CPU_HAS_SSE2
+	select BR2_PACKAGE_FFTW_USE_NEON if BR2_ARM_CPU_HAS_NEON && !BR2_ARM_SOFT_FLOAT
+	help
+	  Compile fftw in single precision, i.e. use 'float' for
+	  floating point type.
+
+config BR2_PACKAGE_FFTW_PRECISION_DOUBLE
+	bool "double"
+	select BR2_PACKAGE_FFTW_USE_SSE2 if BR2_X86_CPU_HAS_SSE2
+	help
+	  Compile fftw in double precision (the default), i.e. use
+	  'double' for floating point type.
+
+config BR2_PACKAGE_FFTW_PRECISION_LONG_DOUBLE
+	bool "long double"
+	# long-double precision require long-double trigonometric routines
+	depends on !(BR2_TOOLCHAIN_BUILDROOT_UCLIBC && \
+		(BR2_arm || BR2_mips || BR2_mipsel))
+	help
+	  Compile fftw in long double precision, i.e. use 'long double'
+	  for floating point type.
+
+config BR2_PACKAGE_FFTW_PRECISION_QUAD
+	bool "quad"
+	# quad-precision needs to have a gcc with libquadmath
+	depends on (BR2_i386 || BR2_x86_64) && BR2_USE_WCHAR
+	help
+	  Compile fftw in quadruple precision, i.e. use '__float128' for
+	  floating point type.
+
+endchoice
+
+config BR2_PACKAGE_FFTW_FAST
+	bool "optimise for speed over accuracy"
+	help
+	  Optimise for fast math functions, at the expense of accuracy.
+
+	  Say 'y' if you need speed and can live with inaccuracies in
+	  the results. Say 'n' (the default) if accuracy is of utmost
+	  importance.
+
+	  This basically uses gcc's -Ofast optimisation level, which in
+	  turn is basically using gcc's -ffast-math. See the gcc manual
+	  for what this means.
+
+endif

buildroot/package/fftw/fftw.hash

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+# From http://www.fftw.org/fftw-3.3.7.tar.gz.md5sum
+md5 0d5915d7d39b3253c1cc05030d79ac47  fftw-3.3.7.tar.gz
+# Locally computed
+sha256 3b609b7feba5230e8f6dd8d245ddbefac324c5a6ae4186947670d9ac2cd25573	fftw-3.3.7.tar.gz
+sha256 231f7edcc7352d7734a96eef0b8030f77982678c516876fcb81e25b32d68564c	COPYING

buildroot/package/fftw/fftw.mk

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+################################################################################
+#
+# fftw
+#
+################################################################################
+
+FFTW_VERSION = 3.3.7
+FFTW_SITE = http://www.fftw.org
+FFTW_INSTALL_STAGING = YES
+FFTW_LICENSE = GPL-2.0+
+FFTW_LICENSE_FILES = COPYING
+
+# fortran support only enables generation and installation of fortran sources
+ifeq ($(BR2_TOOLCHAIN_HAS_FORTRAN),y)
+FFTW_CONF_OPTS += --enable-fortran
+FFTW_CONF_ENV += FLIBS="-lgfortran -lm"
+else
+FFTW_CONF_OPTS += --disable-fortran
+endif
+
+FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_PRECISION_SINGLE),--enable,--disable)-single
+FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_PRECISION_LONG_DOUBLE),--enable,--disable)-long-double
+FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_PRECISION_QUAD),--enable,--disable)-quad-precision
+
+FFTW_CFLAGS = $(TARGET_CFLAGS)
+ifeq ($(BR2_PACKAGE_FFTW_FAST),y)
+FFTW_CFLAGS += -O3 -ffast-math
+endif
+
+# x86 optimisations
+FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_USE_SSE),--enable,--disable)-sse
+FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_USE_SSE2),--enable,--disable)-sse2
+
+# ARM optimisations
+FFTW_CONF_OPTS += $(if $(BR2_PACKAGE_FFTW_USE_NEON),--enable,--disable)-neon
+FFTW_CFLAGS += $(if $(BR2_PACKAGE_FFTW_USE_NEON),-mfpu=neon)
+
+# Generic optimisations
+ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),y)
+FFTW_CONF_OPTS += --enable-threads
+FFTW_CONF_OPTS += $(if $(BR2_GCC_ENABLE_OPENMP),--without,--with)-combined-threads
+else
+FFTW_CONF_OPTS += --disable-threads
+endif
+FFTW_CONF_OPTS += $(if $(BR2_GCC_ENABLE_OPENMP),--enable,--disable)-openmp
+
+FFTW_CONF_OPTS += CFLAGS="$(FFTW_CFLAGS)"
+
+$(eval $(autotools-package))